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Abstract

In this work, we have designed a new high entropy alloy containing lightweight elements, e.g., Al, Fe, Mn, Ti, Cu, Si by high energy ball milling and spark plasma sintering. The composition of Si was kept at 0.75 at% in this study. The results showed that the produced AlCuFeMnTiSi0.75 high entropy alloy was BCC structured. The evolution of BCC1 and BCC2 phases was observed with increasing the milling time up to 60 h. The spark plasma sintering treatment of milled compacts from 650-950°C showed the phase separation of BCC into BCC1 and BCC2. The density and strength of these developed high entropy alloys (95-98%, and 1000 HV) improved with milling time and were maximum at 850°C sintering temperature. The current work demonstrated desirable possibilities of Al-Si based high entropy alloys for substitution of traditional cast components at intermediate temperature applications.
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Bibliography

[1] J.W. Yeh, S.K. Chen, S.J. Lin, J.Y. Gan, T.S. Chin, T.T. Shun, C.H. Tsau, S.Y. Chang, Adv. Eng. Mater. 6, 299 (2004).
[2] B.S. Murty, J.W. Yeh, S. Ranganathan, High-Entropy Alloys, 1st edn. Butterworth-Heinemann, Oxford 2014.
[3] B. Cantor, I.T.H. Chang, P. Knight, A.J.B. Vincent, Mater. Sci. Eng. A 375-377, 213 (2004).
[4] B. Cantor, Entropy 16, 4749 (2014). [5] W. Li, S. Cui, J. Han, C. Xu, Rare Met. 25, 133 (2006).
[6] A. Kumar, M. Gupta, Metals 6 (9), 199 (2016)
[7] K.M. Youssef, A.J. Zaddach, C. Niu, D.L. Irving, C.C. Koch, Mater. Res. Lett. 3, 95 (2014).
[8] K. Tseng, Y. Yang, C. Juan, T. Chin, C. Tsai, J. Yeh, Sci China Technol Sci. 61, 184 (2018).
[9] A. Sharma, D.U. Lim, J.P. Jung, Mater. Sci. Technol. 32 (8), 773 (2016).
[10] J.J. Chen, X. Zhou, W. Wang, B. Liu, Y. Lv, W. Yang, D. Xu, Y. Liu, J. Alloy. Compd. 760, 15 (2018).
[11] J.M. Torralba, P. Alvaredo, A.G. Junceda, Powder Met. 63, 227 (2020).
[12] B.D. Cullity, S.R. Stock, Elements of X-ray Diffraction, (3rd ed.), New York, Prentice Hall, 2001.
[13] M.J. Chae, A. Sharma, M.C. Oh, B. Ahn, Met. Mater. Int. 27, 629 (2021).
[14] A. Sharma, M.C. Oh, B. Ahn, Mater. Sci. Eng. A 797, 140066 (2020).
[15] J.M. Sanchez, I. Vicario, J. Albizuri, T. Guraya, E.M. Acuña, Sci Rep. 9, 6792 (2019).
[16] A. Kumar, P. Dekhne, A.K. Swarnakar, M. Chopkar, Mater. Res. Exp. 6, 026532 (2019).
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Authors and Affiliations

Minsu Kim
1
Ashutosh Sharma
1
ORCID: ORCID
Myoung Jin Chae
1
Hansung Lee
1
ORCID: ORCID
Byungmin Ahn
1
ORCID: ORCID

  1. Ajou University, Department of Materials Science and Engineering and Department of Energy Systems Research, 206 Worldcup-ro, Suwon-si, Gyeonggi, 16499, Korea
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Abstract

Effect of Cu addition on oxide growth of Al-7 mass%Mg alloy at high temperature was investigated. As-cast microstructures of Al-7 mass%Mg and Al-7 mass%Mg-1 mass%Cu alloys showed α-Al dendrites and area of secondary particles. The 1 mass%Cu addition into Al-7 mass%Mg alloy formed Mg32(Al, Cu)49 ternary phase with β-Al3Mg2. The total fraction of two Mg-containing phases in Cu-added alloy was higher than the β-Al3Mg2 fraction in Cu-free alloy. From measured weight gains depending on time at 500°C under an air atmosphere, it was shown that all samples exhibited significant weight gains depending on time. Al-7mass%Mg-1mass%Cu alloy showed the relatively increased oxidation rate when compared with Cu-free alloy. All the oxidized cross-sections throughout the entire oxidation time showed coarse and dark areas regarded as oxides grown from the surface to inside, but bigger oxidized areas were formed in the Al-7mass%Mg-1mass%Cu alloy containing higher fraction of Mg-based phases in the as-cast microstructure. As a result of compositional analysis on the oxide clusters, it was found that the oxide clusters contained Mg-based oxides formed through internal oxidation during a long time exposure to oxidizing environments.
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Bibliography

[1] J.R. Davis, ASM International, Aluminum and Aluminum Alloys, Materials Park 1993.
[2] H. Watanabe, K. Ohori, Y. Takeuchi, Trans. Iron Steel Inst. Jpn. 27, 730 (1987).
[3] J.L. García-Hernández, C.G. Garay-Reyes, I.K. Gómez-Barraza, M.A. Ruiz-Esparza-Rodríguez, E.J. Gutiérrez-Castañeda, I. Estrada-Guel, M.C. Maldonado-Orozco, R. Martínez-Sánchez, J. Mater. Res. Technol. 8 (6), 5471 (2019).
[4] M . Mihara, C.D. Marioara, S.J. Andersen, R. Holmestad, E. Kobayashi, T. Sato, Mater. Sci. Eng. A, 658, 91 (2016).
[5] S.H. Ha, B.H. Kim, Y.O. Yoon, H.K. Lim, T.W. Lee, S.H. Lim, S.K. Kim, Int. J. Metalcast. 13, 121 (2019).
[6] G. Wu, K. Dash, M.L. Galano, K.A.Q. O’Reilly, Corros. Sci. 155, 97 (2019).
[7] B.H. Kim, S.H. Ha, Y.O. Yoon, H.K. Lim, S.K. Kim, D.H. Kim, Mater. Lett. 228, 108 (2018).
[8] H. Okamoto, J. Phase Equilibria 19, 598 (1998).
[9] T.S. Parel, S.C. Wang, M. J. Starink, Mater. Des. 31, S2 (2010).
[10] C.W. Bale, E. Bélisle, P. Chartrand, S.A. Decterov, G. Eriksson, A.E. Gheribi, K. Hack, I.H. Jung, Y.B. Kang, J. Melançon, A.D. Pelton, S. Petersen, C. Robelin, J. Sangster, P. Spencer, M.A. Van Ende, Calphad 54, 35 (2016).
[11] S.H. Ha, B.H. Kim, Y.O. Yoon, H.K. Lim, T.W. Lee, S.H. Lim, S.K. Kim, Sci. Adv. Mater. 10, 697 (2018).
[12] D . Ajmera, E. Panda, Corros. Sci. 102, 425 (2016).
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Authors and Affiliations

Seong-Ho Ha
1
ORCID: ORCID
Abdul Wahid Shah
1
ORCID: ORCID
Bong-Hwan Kim
1
ORCID: ORCID
Young-Ok Yoon
1
ORCID: ORCID
Hyun-Kyu Lim
1
ORCID: ORCID
Shae K. Kim
1
ORCID: ORCID

  1. Korea Institute of Industrial Technology (KITECH), Advanced Materials and Process R&D Department, Incheon 21999, Republic of Korea
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Abstract

The objective of the present research is to develop new admixed lubricants which can be used for high-density sintered iron when processed using warm die and warm compaction. Depending on various lubricants, the effect of compaction temperature on the ejection behavior and sintered properties was studied. Lubricants were prepared by mixing of Zn-stearate and ethylene bis stearamide (EBS) in various compositions. The iron powders blended with lubricants were compacted under the pressure of 700 MPa at various temperatures. The green compacts were sintered at 1120°C for 30 min. Microstructure, density, hardness, and transverse rupture strength of sintered materials with different lubricants were investigated in detail.
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Bibliography

[1] Y.Y. Li, T.L. Nagi, D.T. Zhang, Y. Long, W. Xia, J. Mater. Process. Technol. 129, 354 (2002).
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[11] M.C. Oh, H. Seok, H.-J. Kim, B. Ahn, Arch. Metall. Mater. 60, 1427 (2015)
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Authors and Affiliations

Min Chul Oh
1 2
ORCID: ORCID
Byungmin Ahn
1
ORCID: ORCID

  1. Ajou University, Department of Materials Science and Engineering and Department of Energy Systems Research, 206 WORLDCUP-RO, SUWON, Gyeonggi, 16499, Korea
  2. AI & Mechanical System Center, Institute for Advanced Engineering, 175-28 GOAN-RO 51 BEON-GIL, Yyongin, Gyeonggi, 17180, Korea
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Abstract

Influence of Si addition on oxide layer growth of Al-6 mass%Mg alloys in molten state was investigated in this study. After melt holding for 24 h, the melt surface of only Si-free alloy became significantly bumpy, while no considerably oxidized surface was observed even with 1 mass%Si addition. There was no visible change on the appearance of melt surfaces with increasing Si content. As a result of compositional analysis on the melt samples between before and after melt holding, the Si-added alloys nearly maintained their Mg contents even after the melt holding for 24 h. On the other hand, the Mg content in the Si-free alloy showed a great reduction. The bumpy surface on Si-free alloy melt showed a large amount of pores and oxide clusters in its cross-section, while the Si-added alloy had no significantly grown oxide clusters on the surfaces. As a result of compositional analysis on the surfaces, the oxide clusters in Si-free alloy contained a great amount of Mg and oxygen. The oxide layer on the Si-added alloy was divided into Mg-rich and Mg-poor areas and contained certain amounts of Si. Such a mixed oxide layer containing Si would act as a protective layer during the melt holding for a long duration.
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Bibliography

[1] J.R. Davis, ASM International, Aluminum and Aluminum Alloys, Materials Park 1993.
[2] G . Wu, K. Dash, M.L. Galano, K.A.Q. O’Reilly, Corros. Sci. 155, 97 (2019).
[3] B.H. Kim, S.H. Ha, Y.O. Yoon, H.K. Lim, S.K. Kim, D.H. Kim, Mater. Lett. 228, 108 (2018).
[4] S.H. Ha, B.H. Kim, Y.O. Yoon, H.K. Lim, T.W. Lee, S.H. Lim, S.K. Kim, Sci. Adv. Mater. 10, 697 (2018).
[5] D . Ajmera, E. Panda, Corros. Sci. 102, 425 (2016).
[6] N. Smith, A. Kvithyld, G. Tranell, Metall. Mater. Trans. B 49, 2846 (2018).
[7] S.H. Ha, B.H. Kim, Y.O. Yoon, H.K. Lim, T.W. Lee, S.H. Lim, S.K. Kim, Int. J. Metalcast. 13, 121 (2019).
[8] J. Jeong, J. Im, K. Song, M. Kwon, S.K. Kim, Y.B. Kang, S.H. Oh, Acta Mater. 61, 3267 (2013).
[9] F . Zarei, H. Nuranian, K. Shirvani, Surf. Coat. Technol. 394, 125901 (2020).
[10] Y.L. Zhang, J. Li, Y.Y. Zhang, D.N. Kang, J. Alloys Compd. 827, 154131 (2020).
[11] W. Kai, P.C. Kao, P.C. Lin, I.F. Ren, J.S.C. Jang, Intermetallics 18, 1994 (2010).
[12] S.H. Ha, B.H. Kim, Y.O. Yoon, H.K. Lim, S.K. Kim, Sci. Adv. Mater. 10, 694 (2018).
[13] C.W. Bale, E. Bélisle, P. Chartrand, S.A. Decterov, G. Eriksson, A.E. Gheribi, K. Hack, I.H. Jung, Y.B. Kang, J. Melançon, A.D. Pelton, S. Petersen, C. Robelin, J. Sangster, P. Spencer, M.A. Van Ende, Calphad 54, 35 (2016).
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Authors and Affiliations

Young-Ok Yoon
1
ORCID: ORCID
Seong-Ho Ha
1
ORCID: ORCID
Abdul Wahid Shah
1
ORCID: ORCID
Bong-Hwan Kim
1
ORCID: ORCID
Hyun-Kyu Lim
1
ORCID: ORCID
Shae K. Kim
1
ORCID: ORCID

  1. Korea Institute of Industrial Technology (KITECH), Advanced Materials and Process R&D Department, Incheon 21999, Republic of Korea
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Abstract

In this study, we propose a cooling structure manufactured using a specialized three-dimensional (3D) printing design method. A cooling performance test system with complex geometry that used a thermoelectric module was manufactured using metal 3D printing. A test model was constructed by applying additive manufacturing simulation and computational fluid analysis techniques, and the correlation between each element and cooling efficiency was examined. In this study, the evaluation was conducted using a thermoelectric module base cooling efficiency measurement system. The contents were compared and analyzed by predicting the manufacturing possibility and cooling efficiency, through additive manufacturing simulation and computational fluid analysis techniques, respectively.
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Bibliography

[1] M .K. Thompson et al, Design for Additive Manufacturing: Trends, opportunities, considerations, and constraints, CIRP Annuals 65, 737-760 (2016).
[2] M . Kumke, H. Watschke, T. Vietor, A new methodological framework for design for additive manufacturing, Virtual and Physical Prototyping 11, 3-19 (2016).
[3] L. Frizziero and et al., Design for Additive Manufacturing and Advanced Development Methods Applied to an Innovative Multifunctional Fan, Additive Manufacturing: Breakthoughs in Research and Practic 34 (2020).
[4] F .F. Wang, E. Parker, 3D printed micro-channel heat sink design considerations, 2016 International Symposium on 3D Power Electronics Integration and Manufacturing 16320350 (2016).
[5] Chunlei Wan and et al., Flexible n-type thermoelectric materials by organic intercalation of layered transition metal dischalcogenide TiS2, Nature Materials 14, 622-627 (2015).
[6] M . Helou, S. Kara, Design, analysis and manufacturing of lattice structures: an overview, International Journal of Computer Integrated Manufacturing 31, 243-261 (2018).
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[10] S. Emrecan et al., Thermo-mechanical simulations of selective laser melting for AlSi10Mg alloy to predict the part-scale deformations, Progress in Additive Manufacturing 465-478 (2019).
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Authors and Affiliations

Yeong-Jin Woo
1 2
ORCID: ORCID
Dong-Ho Nam
1
ORCID: ORCID
Seok-Rok Lee
1
ORCID: ORCID
Eun-Ah Kim
1
ORCID: ORCID
Woo-Jin Lee
1
ORCID: ORCID
Dong-Yeol Yang
1
ORCID: ORCID
Ji-Hun Yu
1
ORCID: ORCID
Yong-Ho Park
2
ORCID: ORCID
Hak-Sung Lee
1
ORCID: ORCID

  1. Korea Institute of Materials Science, Changwon, 51508, Republic of Korea
  2. Pusan National University, Busan, 46241, Republic of Korea
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Abstract

A novel process to recover lithium and manganese oxides from a cathode material (LiMn2O4) of spent lithium-ion battery was attempted using thermal reaction with hydrogen gas at elevated temperatures. A hydrogen gas as a reducing agent was used with LiMn2O4 powder and it was found that separation of Li2O and MnO was taken place at 1050°C. The powder after thermal process was washed away with distilled water and only lithium was dissolved in the water and manganese oxide powder left behind. It was noted that manganese oxide powder was found to be 98.20 wt.% and the lithium content in the solution was 1,928 ppm, respectively.
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Authors and Affiliations

Jei-Pil Wang
1

  1. Pukyong National University, Department of Metallurgical Engineering, Busan, Republic of Korea
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Abstract

Selective deposition was performed on a micrometer trench pattern using a microcontact printing (μCP) process. Alkanethiols required for selective deposition were analyzed according to the carbon chain by linear sweep voltammetry (LSV). According to the LSV analysis, the effect of inhibiting Cu deposition depending on the length of the carbon chain was observed. During the Cu electrodeposition, the trench could be filled without voids by additives (PEG, SPS, JGB) in the plating solution. A μCP process suppressing the deposition of the sample was used for selective Cu electrodeposition. However, there was oxidation and instability of the sample and 1-hexadecanethiol in air. To overcome these problems, the μCP method was performed in a glove box to achieve effective inhibition.
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Bibliography

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Authors and Affiliations

Jinyong Shim
1
ORCID: ORCID
Jinhyun Lee
1
ORCID: ORCID
Bongyoung Yoo
1
ORCID: ORCID

  1. Hanyang University, Department of Material Science & Chemical Engineering, Ansan, Korea
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Abstract

Gadolinium oxide (Gd2O3) is one of the lanthanide rare-earth oxides, which has been extensively studied due to its versatile functionalities, such as a high permittivity, reactivity with moisture, and ionic conductivity, etc. In this work, GdOx thin film was grown by atomic layer deposition using cyclopentadienyl (Cp)-based Gd precursor and water. As-grown GdOx film was amorphous and had a sub-stoichiometric (x ~ 1.2) composition with a uniform elemental depth profile. ~3 nm-thick GdOx thin film could modify the hydrophilic Si substrate into hydrophobic surface with water wetting angle of 70°. Wetting and electrical test revealed that the growth temperature affects the hydrophobicity and electrical strength of the as-grown GdOx film.
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Bibliography

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Authors and Affiliations

Sung Yeon Ryu
1
Hee Ju Yun
1
Min Hwan Lee
2
Byung Joon Choi
1
ORCID: ORCID

  1. Seoul National University of Science and Technology, Department of Material Science and Engineering, Seoul 01811, Korea
  2. University of California Merced, Department of Mechanical Engineering, Merced, California, USA
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Abstract

Rutile-TiO2 nanorod thin films were formed on Ti disks via alkali treatment in NaOH solutions followed by heat treatment at 700°C. Ag nanoparticles were loaded on nanorods using a photo-reduction method to improve the photocatalytic properties of the prepared specimen. The surface characterization and the photo-electrochemical properties of the Ag-loaded TiO2 nanorods were investigated using a field-emission scanning electron microscope (FE-SEM), X-ray photoelectron spectroscopy (XPS), UV-Vis spectroscopy and electrochemical impedance spectroscopy (EIS). The TiO2 nanorods obtained after the heat treatment were 80 to 180 nm thick and 1 μm long. The thickness of the nanorods increased with the NaOH concentration. The UV-Vis spectra exhibit a shift in the absorption edge of the Ag-loaded TiO2 to the visible light range and further narrowing of the bandgap. The decrease in the size of the capacitive loops in the EIS spectra showed that the Ag loading effectively improved the photocatalytic activity of the TiO2 nanorods.
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Authors and Affiliations

Kwangmin Lee
1
ORCID: ORCID
Daeheung Yoo
1 2
Ahmad Zakiyuddin
3
ORCID: ORCID

  1. Chonnam National University, School of Materials Science and Engineering, Gwangju 61186, Republic of Korea
  2. Quality Tech. Dept. Chosun Refractories Co., Ltd, Republic of Korea
  3. Universitas Indonesia, Department of Metallurgical and Materials Engineering, Depok 16425 Indonesia
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Abstract

In this study, energetic behaviors of polyvinylidene fluoride (PVDF)-coated zirconium (Zr) powders were investigated using thermogravimetric analyzer-differential scanning calorimetry (TGA-DSC). PVDF-coated Zr powder had 1.5 times higher heat flow than ZrO2-passivated Zr powder. PVDF-coated Zr powder had a Zr-F compound formed on its surface by its strong chemical bond. This compound acted as an oxidation-protecting layer, providing an efficient combustion path to inner pure Zr particle while thermal oxidation was progressing at the same time. PVDF coating layers also made thermal reaction start at a lower temperature than ZrO2-passivated Zr powder. It was obtained that the surface PVDF coating layer evaporated at approximately 673 K, but the surface oxide layer fully reacted at approximately 923 K by DSC analysis. Hence, Zr powders showed enhanced energetic properties by the PVDF-coated process.
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Authors and Affiliations

Won Young Heo
1
ORCID: ORCID
Sung Hwa Bae
2
ORCID: ORCID
Injoon Son
1
ORCID: ORCID

  1. Kyungpook National University, Department of Materials Science and Metallurgical Engineering, Daegu 41566, Republic of Korea
  2. Kyushu University, Department of Materials Process Engineering, Graduate School of Engineering, Fukuoka, Japan
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Abstract

An artificial neural network (ANN) model was developed to predict the tensile properties of dual-phase steels in terms of alloying elements and microstructural factors. The developed ANN model was confirmed to be more reasonable than the multiple linear regression model to predict the tensile properties. In addition, the 3D contour maps and an average index of the relative importance calculated by the developed ANN model, demonstrated the importance of controlling microstructural factors to achieve the required tensile properties of the dual-phase steels. The ANN model is expected to be useful in understanding the complex relationship between alloying elements, microstructural factors, and tensile properties in dual-phase steels.
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Authors and Affiliations

Seung-Hyeok Shin
1
ORCID: ORCID
Sang-Gyu Kim
1
ORCID: ORCID
Byoungchul Hwang
1
ORCID: ORCID

  1. Seoul National University of Science and Technology, Department of Materials Science and Engineering, Seoul, 01811, Republic of Korea
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Abstract

Ferrotitanium can be produced as a method of recycling Ti scraps. The eutectic composition of ferrotitanium, Fe29.5Ti70.5, can be obtained as a nanocrystalline phase due to relatively low melting point. Fe29.5Ti70.5 in which FeTi and β-Ti form a lamellar structure have high strength but low strain. To improve this, impurities were removed through hydrogen plasma arc melting (HPAM) and annealed. HPAM can remove substitutional/interstitial solid solutions. As a result, from 6733 ppm to 4573 ppm of initial impurities were removed by HPAM process. In addition, the strain was improved by spheroidizing and coarsening the lamellar structure through annealing. The effect of impurities removed through HPAM on the Young’s modulus, yield strength, and strain was observed.
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Authors and Affiliations

Suhwan Yoo
1
Jung-Min Oh
1
Jaeyeol Yang
2
Jaesik Yoon
2
Jae-Won Lim
1

  1. Jeonbuk National University, Division of Advanced Materials Engineering, College of Engineering, Jeonju 54896, Republic of Korea
  2. Korea Basic Science Institute, Division of Earth and Environmental Science, Cheongju 28119, Republic of Korea
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Abstract

In this study, a new chemically modified cellulose polymer-capped ZnO nanopowder prepared by hydrothermal method using chemically modified cellulose polymer as capping agent was successfully reported. The structural characteristics of CMC-capped ZnO nanopowder was reported by FTIR, XRD, SEM and EDX studies. XRD results revealed crystallographic properties like crystal composition, phase purity and crystallite size of the prepared CMC-capped ZnO nanopowder and average size calculated by Debye Scherrer formula as 14.66 nm. EDX studies revealed that the presence of elemental compositions of capping agent in the nanopowder samples. The optical characterization of the CMC-capped ZnO nanopowder was studied using UV absorption (λmax = 303 nm) and PL spectroscopy (λex = 295 nm). The average crystal diameter and grain size were calculated by effective mass approximation formula and compared with XRD findings that agreed well and verified CMC capped ZnO with particle size of 193 nm. Thus, the promising optical characteristics shown by the synthesized CMC capped ZnO nanopowders exposes its potential usage in bio-medical fields.
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Authors and Affiliations

R. Jagadeeswari
1
P. Selvakumar
2
ORCID: ORCID
V. Jeevanantham
2
ORCID: ORCID
R. Saravanan
1

  1. Department of Chemistry, KPR Institute of Engineering And Technology, Coimbatore-641407, Tamilnadu, India
  2. Department of Chemistry, Vivekanandha College of Arts And Sciences for Women, Tiruchengode-637205, Tamilnadu, India
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Abstract

This research study intends to develop an online tool condition monitoring system and to examine scientifically the effect of machining parameters on quality measures during machining SAE 1015 steel. It is accomplished by adopting a novel microflown sound sensor which is capable of acquiring sound signals. The dry turning experiments were performed by employing uncoated, TiAlN, TiAlN/WC-C coated inserts. The optimal cutting conditions and their influence on flank wear were determined and predicted value has been validated through confirmation experiment. During machining, sound signals were acquired using NI DAQ card and statistical analysis of raw data has been performed. Kurtosis and I-Kaz coefficient was determined systematically. The correlation between flank wear and I-Kaz coefficient was established, which fits into power-law curve. The neural network model was trained and developed with least error (3.7603e-5). It reveals that the developed neural network can be effectively utilized with minimal error for online monitoring.
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Authors and Affiliations

Moganapriya Chinnasamy
1
ORCID: ORCID
Rajasekar Rathanasamy
1
ORCID: ORCID
Gobinath Velu Kaliyannan
2
ORCID: ORCID
Prabhakaran Paramasivam
1
ORCID: ORCID
Saravana Kumar Jaganathan
3 4 5
ORCID: ORCID

  1. Kongu Engineering College, Department of Mechanical Engineering, Perundurai – 638060, Tamil Nadu State, India
  2. Kongu Engineering College, Department of Mechatronics Engineering, Perundurai – 638060, Tamil Nadu State, India
  3. Bionanotechnology Research Group, Ton Duc Thang University, Ho Chi Minh City, Vietnam
  4. Faculty of Applied Sciences, Ton Duc Thang University, Ho Chi Minh City, Vietnam
  5. Department of Engineering, Faculty of Science and Engineering, University of Hull, HU6 7RX, United Kingdom
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Abstract

In this study, NiCrBSi-B4C (wt. %5, %10 ve %15 B4C) powder mixtures are coated on the stainless steel surface of AISI304 by tungsten inert gas (TIG) method. We use optic microscope and scanning electron microscope (SEM) for the coating layer analysis, energy dispersive spectrometry (EDS) for element distribution analysis and X-ray diffractogram (XRD) for the analysis of phase components. The measurements of hardness are determined by the microhardness tester. Based on the results obtained by the examination of microstructure and phases, it has been observed that while B and C elemets are more intense in the middle and upper parts of the coating layer, the parts close to the interface have a higher intensity of Ni and Fe. Moreover, there are phases such as Cr7C3, γ – Ni, CrFeB, Ni3B, CrB ve Fe2B are formed in the coating layer. The increasing ratio of B4C results in increasing on the measurement values of microhardness. The maximum hardness value (430,8 HV0.2) is obtained from the coating layer of S4 sample while the minimum value (366,9 HV0.2) is observed from the NiCrBSi coated sample.
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Authors and Affiliations

Musa Kiliҫ
1
ORCID: ORCID

  1. Batman University, Faculty of Technology, Department of Manufacturing Engineering, Batman, Turkey
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Abstract

This study is to find the extent of variation in mechanical properties between plate and pipe welds fabricated out of the same FSW process parameters. Common thickness of 3 mm along with similar tool specifications is used to fabricate the weld. Process parameters of tool rotational speed 2000 rpm and weld speed 94 mm/min that was defined as optimal for pipe weld is used as common process parameters. Welds are analyzed for hardness and tensile properties. Yield strength and ultimate tensile strength varied about 8.1% and 11.2% respectively between plate and pipe welds. The hardness of the stir zones varied about 11.6% between plate and pipe welds.
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Authors and Affiliations

S.M. Senthil
1
ORCID: ORCID
S. Ragu Nathan
2
R. Parameshwaran
1
ORCID: ORCID
M. Bhuvanesh Kumar
3

  1. Kongu Engineering College, Erode, India
  2. Sree Vidyan Ikethan Engineering College, Tirupati, India
  3. National Institute of Technology, Tiruchirappalli, India
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Abstract

This work investigates the distribution and the effect of synthesized nano TiO2, micro SiC and B4C particle on the aluminium (A356) metal matrix composites (AMMC). The consequences of this reinforcement on the mechanical, tribology and corrosion behaviour of the AMMC matrix are analyzed. The nano TiO2 is synthesized by wet chemistry sol-gel process, and the reinforcements are added with A-356 by stir casting method. The ASTM standard test specimens are characterized through mechanical, tribology, and corrosion tests for identifying their properties. The metallurgical characterization has been deliberated through XRD and SEM with EDS. In the tensile test results, the percentage of elongation is dropped drastically by 73% due to the enhanced volume % of nano TiO2, micro SiC, and B4C particles. The particle addition of the wear rate and weight loss are reduced at different volume percentages of the A356 matrix. The time plays a significant role in the corrosion rate. The test results also confirm that the corrosion rate is comparatively minimum in 24 hrs (592.35 mm/yr) duration than the 48 hrs (646.368 mm/yr) in both the solutions.
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Authors and Affiliations

D. Paulraj
1
ORCID: ORCID
P.D. Jeyakumar
1
ORCID: ORCID
G. Rajamurugan
2
ORCID: ORCID
P. Krishnasamy
2
ORCID: ORCID

  1. B.S. Abdur Rahman Crescent Institute of Science and Technology, Department of Mechanical Engineering, Chennai-600 048, Tamilnadu, India
  2. Vellore Institute of Technology, School of Mechanical Engineering, Vellore-632014, Tamilnadu, India
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Abstract

A huge amount of carbon black (40-60 phr) was commonly used as a reinforcing material in manufacturing of tires to improve the technical properties of pure rubber. Carbon black causes severe health hazard like skin cancer, respiratory problem due to its fly loss property. This study focusses on reducing the usage of carbon black by replacing it with minimal quantity of nanoclay to compensate the technical properties of rubber. Natural Rubber nanocomposite are fabricated using solution and mechanical mixing method in presence and absence of compatibilizer. Cure characteristics, wear test and mechanical properties were examined. NR nanocomposite with dual filler in presence of compatibilizer showed enhancement in torque values, mechanical and wear resistant property. Wear resistance, tensile strength and modulus of dual filler nanocomposite was increased by 66.7%, 91% and 85% when compared to pure NR. Hence NR nanocomposite with dual filler in presence of compatibilizer was found as a proving and possible nanocomposite for tire application.
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Authors and Affiliations

M. Harikrishna Kumar
1
ORCID: ORCID
Shankar Subramaniam
1
Rajasekar Rathanasamy
1
ORCID: ORCID
Samir Kumar Pal
2
ORCID: ORCID
Sathish Kumar Palaniappan
2

  1. School of Building and Mechanical Sciences, Kongu Engineering College, Perundurai – 638060, Tamil Nadu State, India
  2. Department of Mining Engineering, Indian Institute of Technology, Kharagpur – 721302, West Bengal State, India
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Abstract

Nowadays the automotive industry mostly prefers innovative solid-state welding technologies that would enable to welding of lightweight and high-performance materials. In this work, 3105-H18 Aluminium alloy (Al) and pure Copper (Cu) specimens with 0.5 mm thickness have been ultrasonically welded in a dissimilar (Al-Cu) manner. Optimization of process parameters of ultrasonic welding has been carried out through full factorial method, three levels of variables considered for this experimental studies namely, weld pressure, amplitude, and time, also each variable interaction with welding strength has been studied. Additionally, micro-hardness and microstructure investigation in welded joints has been studied. The result shows that the weld strength greatly influenced weld amplitude at a medium and higher level of weld pressure. The interface micro-hardness of the welded joint has lower compared to the base metal.
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Authors and Affiliations

A. Mohan Kumar
1
ORCID: ORCID
R. Rajasekar
1
ORCID: ORCID
V. Karthik
2
ORCID: ORCID
S. Kheawhom
3
ORCID: ORCID

  1. School of Building and Mechanical Sciences, Kongu Engineering College, Erode, Tamilnadu, India - 6380602
  2. NIT, Tiruchirappalli, Department of Metallurgical and Materials Engineering, Tamilnadu, India – 620015
  3. Chulalongkorn University, Faculty of Engineering, Department of Chemical Engineering, Bangkok, Thailand – 10330
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Abstract

In this study, the alloying of Ti, Al and Dy powders by high energy ball milling, and the spark plasma sintering (SPS) characteristics of as milled powders have been investigated based on the observation of microstructure. Pure Ti, 6wt% Al and 4wt% Dy powders were mixed and milled with zirconia balls at 600 ~ 1000 rpm for 3h in an Ar gas. The initial sizes of Ti, Al and Dy powders were approximately 20, 40, and 200 μm, respectively. With increasing the milling speed from 600 to 1000 rpm, the size of mixing powders reduced from 120 to 15 μm. On the other hand, from XRD results of powders milled at higher speeds than 700rpm, the peaks of Ti3Al and AlDy phases were identified, indicating the successful alloying. Therefore, the powders milled at 800 rpm have been employed for the SPS under the applied pressure of 50 MPa at 1373K for 15 min. In the SPSed sample, the Al3Dy and two ternary Ti-Al-Dy phases were newly detected, while the peak of AlDy phase disappeared. The SPSed Ti-6Al-4Dy alloy revealed high relative density and micro-hardness of approximately 99% and 950Hv, respectively.
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Authors and Affiliations

Yuri Kim
1
Hoseong Rhee
1
ORCID: ORCID
Si Young Chang
1
ORCID: ORCID

  1. Korea Aerospace University, Department of Materials Science and Engineering, Goyang 10540, Korea
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Abstract

This study suggests a new way to modify the size and morphology of Al-Fe phases in modified AA 7075 by using an Fe-Mn solid solution powder as the precursor. When Fe and Mn are added in the form of a solid solution, the diffusion of Fe and Mn toward the Al is delayed, thus altering the chemical composition and morphology of the precipitates. The fine, spherical precipitates are found to provide a good balance between strength and ductility compared to the case where Fe and Mn are separately added.
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Authors and Affiliations

Min Sang Kim
1 2
ORCID: ORCID
Dae Young Kim
3
ORCID: ORCID
Young Do Kim
1
ORCID: ORCID
Hyun Joo Choi
3
ORCID: ORCID
Se Hoon Kim
2
ORCID: ORCID

  1. Hanyang University, Department of Materials Science & Engineering, Seoul, Republic of Korea
  2. Metallic Material R&D Center, Korea Automotive Technology Institute, Cheonan-si, Republic of Korea
  3. Kookmin University, School of Materials Science and Engineering, Seoul, Republic of Korea
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Abstract

Oxidation and indentation properties of silicon carbide-coated carbon composites were investigated to analyze its durability under atmospheric thermal shock conditions. The silicon carbide-coated samples were prepared either with chemical vapor deposition or chemical vapor reaction/chemical vapor deposition hybrid coating. The remnant weight of uncoated and coated samples was investigated after each thermal shock cycle. The surface and cross-section of coated samples were then analyzed to confirm morphological changes of the coating layers. The spherical indentation test for uncoated and coated samples were also performed. As a result, silicon carbide coating improved the oxidation resistance, elastic modulus, and hardness of carbon composites. Hybrid coating drastically enhanced the durability of samples at high temperature in atmospheric conditions.
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Authors and Affiliations

Ji Eun Lee
1
ORCID: ORCID
Soo Bin Bae
1
ORCID: ORCID
Nam Choon Cho
1
ORCID: ORCID
Hyung Ik Lee
1
ORCID: ORCID
Zicheng Meng
2
ORCID: ORCID
Kee Sung Lee
2
ORCID: ORCID

  1. Agency for Defense Development, Yuseong P.O. Box 35, Daejeon, 34186, Korea
  2. Kookmin University, School of Mechanical Engineering, JEONGNEUNG-RO 77, SEONGBUK-GU, SEOUL, 02707, KOREA
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Abstract

Iron oxide nanoparticles were incorporated to form composite microspheres of SiO2 and Fe2O3 for magnetic separation of the particles after adsorption or photochemical decomposition. Economic material, sodium silicate, was purified by ion exchange to prepare aqueous silicic acid solution, followed by mixing with iron oxide nanoparticles. Resulting aqueous dispersion was emulsified, and composite microspheres of SiO2 and Fe2O3 was formed from the emulsion droplets as micro-reactors during heating. Removal of methylene blue using the composite microspheres was performed by batch adsorption process. Synthesis of composite microspheres of silica containing Fe2O3 and TiO2 nanoparticles was also possible, the particles could be separated using magnets efficiently after removal of organic dye.
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Authors and Affiliations

Young-Sang Cho
1
ORCID: ORCID
Sohyeon Sung
1
ORCID: ORCID

  1. Korea Polytechnic University, Department of Chemical Engineering and Biotechnology, 237 Sangidaehak-ro, Siheung-si, Gyeonggi 15073, Korea
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Abstract

In this study, the surface roughness of galvannealed low carbon Al-killed and Ti-Nb stabilized interstitial free steels was investigated using the industrial galvannealing process parameters. The iron content of the coatings was also analysed to establish a relationship with the surface roughness and coating composition. The surface roughness displayed an exponential behaviour with increasing of annealing time at each annealing temperature in both steel coatings, which was in an increasing order in the galvannealed low carbon Al-killed steel coating, whereas it was a reverse order in the galvannealed Ti-Nb stabilized interstitial free steel coating. The craters were observed on the galvannealed coatings resulting in high surface roughness. Increasing the iron content of the coatings leads to a reduction in the surface roughness with δ1k phase.
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Authors and Affiliations

Candan Sen Elkoca
1
ORCID: ORCID
Bulent Ekmekci
2
ORCID: ORCID
Oktay Elkoca
3
ORCID: ORCID

  1. Bulent Ecevit University, Alapli Vocational High School, Zonguldak 67850, Turkey
  2. Bulent Ecevit University, Department of Mechanical Engineering, Zonguldak 67100, Turkey
  3. Duzce University, Department of Mechanical Engineering, Duzce 81620, Turkey

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