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Effect of Remelting on Microstructure of the AlSi9Cu3 Alloy with Higher Iron Content

M. Matejka D. Bolibruchová

Archives of Foundry Engineering | 2018 | vol.18 | No 4 | 25-30

Keywords metallography heat treatment Al-Si-Cu Remelting

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Abstract

Secondary or multiple remelted alloys are common materials used in foundries. For secondary (recycled) Al-Si-Cu alloys, the major problem is the increased iron presence. Iron is the most common impurity and with presence of other elements in alloy creates the intermetallic compounds, which may negatively affect the structure. The paper deals with effect of multiple remelting on the microstructure of the AlS9iCu3 alloy with increased iron content to about 1.4 wt. %. The evaluation of the microstructure is focused on the morphology of iron-base intermetallic phases in caste state, after the heat treatment (T5) and after natural aging. The occurrence of the sludge phases was also observed. From the obtained results can be concluded that the multiple remelting leads to change of chemical composition, changes in the final microstructure and also increases sludge phases formation. The use of heat treatment T5 led to a positive change of microstructure, while the effect of natural aging is beneficial only to the 3rd remelting.

Authors and Affiliations

M. Matejka

D. Bolibruchová

Influence of Remelting AlSi9Cu3 Alloy with Higher Iron Content on Mechanical Properties

M. Matejka D. Bolibruchová

Archives of Foundry Engineering | 2018 | vol.18 | No 3 | 25-30

Keywords Al-Si-Cu Remelting mechanical properties heat treatment

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Abstract

The paper deals with influence of multiple remelting on AlSi9Cu3 alloy with higher iron content on chosen mechanical properties. Multiple remelting may in various ways influence mechanical, foundry properties, gas saturation, shrinkage cavity, fluidity etc. of alloy. Higher presence of iron in Al-Si cast alloys is common problem mainly in secondary (recycled) aluminium alloys. In Al-Si alloy the iron is the most common impurity and with presence of other elements in alloy creates the intermetallic compounds, which decreases mechanical properties. Iron in the used alloy was increased to about 1.4 wt. %, so that the influence of increased iron content can be investigated. In the paper, the effect of multiple remelting is evaluated with respect to the resulting mechanical properties in cast state, after the heat treatment (T5) and after natural aging. From the obtained results it can be concluded that the multiple remelting leads to change of chemical composition and affect the mechanical properties.

Authors and Affiliations

M. Matejka

D. Bolibruchová

A Study of Microstructure and Porosity Formation in High-Pressure Die-Casting

M. Matejka D. Bolibruchová R. Podprocká

Archives of Foundry Engineering | 2021 | vo. 21 | No 4 | 127-130 | DOI: 10.24425/afe.2021.139761

Keywords Al-Si-Cu alloy Returnable material Numerical simulation Porosity Microstructure

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Abstract

The technology of high-pressure die-casting (HPDC) of aluminum alloys is one of the most used and most economical technology for mass production of castings. High-pressure die-casting technology is characterized by the production of complex, thin-walled and dimensionally accurate castings. An important role is placed on the effective reduction of costs in the production process, wherein the combination with the technology of high-pressure die-casting is the possibility of recycling using returnable material. The experimental part of the paper focuses on the analysis of a gradual increase of the returnable material amount in combination with a commercial purity alloy for the production of high-pressure die-castings. The returnable material consisted of the so-called foundry waste (defective castings, venting and gating systems, etc.). The first step of the experimental castings evaluation consisted of numerical simulations, performed to determine the points of the casting, where porosity occurs. In the next step, the evaluation of areal porosity and microstructural analysis was performed on experimental castings with different amounts of returnable material in the batch. The evaluation of the area porosity showed only a small effect of the increased amount of the returnable material in the batch, where the worst results were obtained by the casting of the alloy with 90% but also with 55% of the returnable material in the batch. The microstructure analysis showed that the increase in returnable material in the batch was visibly manifested only by a change in the morphology of the eutectic Si.

Bibliography

[1] Ragan, E. (2007). Die casting of metals. Prešov, Slovakia. (in Slovak).
[2] Eperješi, Ľ., Malik, J., Eperješi Š. & Fecko D. (2013) Influence of returning material on porosity of die castings. Manufacturing Technology. 13(1), 36-39. DOI: 10.21062/ujep/x.2013/a/1213-2489/MT/13/1/36.
[3] Gaustad, G., Olivetti, E. A. & Kirchain, R. (2012). Improving aluminum recycling: A survey of sorting and impurity removal technologies. Resources Conservation and Recycling. 58, 79-87.
[4] Matejka, M., Bolibruchová, D. & Kuriš, M. (2021). Crystallization of the structural components of multiple remelted AlSi9Cu3 alloy. Archives of Foundry Engineering. 21(2), 41-45. DOI: 10.24425/afe.2021.136096.
[5] Bruna, M., Remišová, A. & Sládek, A. (2019). Effect of filter thickness on reoxidation and mechanical properties of aluminium alloy AlSi7Mg0.3. Archives of Metallurgy and Materials. 3, 1100-1106. DOI: 10.24425/amm.2019.129500.
[6] Bryksi Stunova, B. & Bryksi, V. (2016). Analysis of defects in castings cast by rheocasting method SEED. Archives of Foundry Engineering. 16(3), 15-18. DOI: 10.1515/afe-2016-0041.
[7] Podprocká, R. & Bolibruchová, D. (2017). Iron intermetallic phases in the alloy based on Al-Si-Mg by applying manganese. Archives of Foundry Engineering. 17(3), 217-221. DOI: 10.24425/afe.2020.133321.
[8] Martinec, D., Pastircak, R. & Kantorikova, E. (2020). Using of technology semisolid squeeze casting by different initial states of material. Archives of Foundry Engineering. 20(1), 117-121. DOI: 10.24425/afe.2020.131292.

Authors and Affiliations

M. Matejka

1

e-mail:

ORCID:

D. Bolibruchová

1

e-mail:

ORCID:

R. Podprocká

2

University of Zilina, Faculty of Mechanical Engineering, Department of Technological Engineering, Univerzitna 1, 010 26 Zilina, Slovak Republic
Rosenberg-Slovakia s.r.o., Kováčska 38, 044 25 Medzev, Slovak Republic

Study of AlSi9Cu3 Alloy Crystallization Process with Increased Iron Content at Different Number of Remelts

M. Matejka D. Bolibruchova Justyna Kasińska M. Kuriš

Archives of Foundry Engineering | 2020 | vol. 20 | No 1 | 79-83 | DOI: 10.24425/afe.2020.131287

Keywords Al-Si-Cu Remelting thermal analysis Structural analysis

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Abstract

Monitoring the solidification process is of great importance for understanding the quality of the melt, for controlling it, and for predicting the true properties of the alloy. Solidification is accompanied by the development of heat, the magnitude of which depends on the different phases occurring during solidification. Thermal analysis is now an important part of and tool for quality control, especially when using secondary aluminium alloys in the automotive industry. The effect of remelting on the change of crystallization of individual structural components of experimental AlSi9Cu3 alloy was determined by evaluation of cooling curves and their first derivatives. Structural analysis was evaluated using a scanning electron microscope. The effect of remelting was manifested especially in nucleation of phases rich in iron and copper. An increasing number of remelts had a negative effect after the fourth remelting, when harmful iron phases appeared in the structure in much larger dimensions.

Authors and Affiliations

M. Matejka

e-mail:

ORCID:

D. Bolibruchova

Justyna Kasińska

e-mail:

ORCID:

M. Kuriš

The Effect of Major Alloying Elements on the Size of Secondary Dendrite Arm Spacing in the As-Cast Al-Si-Cu Alloys

M. Djurdjevič M. Grzinčič

Archives of Foundry Engineering | 2012 | No 1 | DOI: 10.2478/v10266-012-0004-2

Keywords Secondary dendrite arm spacing AlSiCu alloy Aluminium casting solidification

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Abstract

A comprehensive understanding of melt quality is of paramount importance for the control and prediction of actual casting characteristics. Among many phenomenon that occur during the solidification of castings, there are four that control structure and consequently mechanical properties: chemical composition, liquid metal treatment, cooling rate and temperature gradient. The cooling rate and alloy composition are most important among them. This paper investigates the effect of the major alloying elements (silicon and copper) of AlSi-Cu alloys on the size of secondary dendrite arm spacing. It has been shown that both alloying elements have reasonable influence on the refinement of this solidification parameter

Authors and Affiliations

M. Djurdjevič

M. Grzinčič

Thermal-Derivative Analysis and Precipitation Hardening of the Hypoeutectic Al-Si-Cu Alloys

P.E. Smolarczyk M. Krupiński

Archives of Foundry Engineering | 2019 | vol. 19 | No 1 | 41-46 | DOI: 10.24425/afe.2018.125189

Keywords Thrermal-derivative analysis Heat treatment hardness Metallographic analysis Al-Si-Cu alloys

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Abstract

The research focused on the influence of the solution temperature on the structure of precipitation hardening multi-component hypoeutectic aluminium alloys. The AlSi8Cu3 and AlSi6Cu4 alloys were used in the study and were subjected to a thermal-derivative analysis. The chemical composition and crystallization of phases and eutectics shift the characteristic points and the corresponding temperatures to other values, which affect to, for instance, the solution temperature. The alloys were supersaturated at 475°C (according to the determined temperature (TSol) and 505°C for 1.5 hours. Aging was performed at 180°C for 5 hours. The Rockwell hardness measurement, metallographic analysis of alloys by means of light microscopy as well as chemical and phase analysis using scanning electron microscopy and X-ray crystallography were carried out on alloys. The use of computer image analysis enabled the determination of the amount of the current Al2Cu phase in the alloys before and after heat treatment.

Authors and Affiliations

P.E. Smolarczyk

M. Krupiński

Effect of Maximum Piston Velocity on Internal Homogeneity of AlSi9Cu3(Fe) Alloy Processed by High-Pressure Die Casting

M. Matejka D. Bolibruchová R. Podprocká

Archives of Foundry Engineering | 2022 | vol. 22 | No 4 | 34-40 | DOI: 10.24425/afe.2022.140249

Keywords Al-Si-Cu alloy High-pressure die casting Porosity Brinell hardness Microstructure

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Abstract

High-pressure die casting results in a high quality surface and good mechanical properties of castings. Under the effect of pressure, integral and solid castings are achieved without a large number of foundry defects. The correct and proper setting of technological parameters plays a very important role in minimizing casting defects. The aim of the presented article is to determine the optimum maximum piston velocity for a casting in the high-pressure casting process with two height variants, depending on their internal quality. It is because the internal quality of particular castings is important in terms of proper functionality in operations where the biggest problem is the porosity of the casting. The main cause of porosity formation is the decreasing solubility of gases (most often hydrogen) during the melt solidification. Solubility represents the maximum amount of gas that can dissolve in a metal under equilibrium conditions of temperature and pressure. Macroporosity and microporosity were determined from the sections of the surfaces in the determined zones of the castings. Here, the results was that the macroporosity decreased with increasing piston velocity. Ideal microstructure was evaluated at a piston velocity of 3 m/s for both types of castings. On the other hand, the increase in tube size has shown that velocities of 3 m/s and higher, the tube is more prone to macroporosity formation. The highest hardness was achieved at the piston velocity of 2 m/s at both tube lengths.

Authors and Affiliations

M. Matejka

1

e-mail:

ORCID:

D. Bolibruchová

1

e-mail:

ORCID:

R. Podprocká

2

University of Zilina, Faculty of Mechanical Engineering, Department of Technological Engineering, Slovak Republic
Rosenberg-Slovakia s.r.o., Slovak Republic

Influence of Rare Earth Sm Addition on Microstructure and Tensile Properties of Al-Si-Cu 319 Alloy

D.N. Patel M.P. Sutaria

Archives of Foundry Engineering | 2023 | vol. 23 | No 1 | 25-33 | DOI: 10.24425/afe.2023.144276

Keywords Al-Si-Cu 319 alloy Samarium SDAS Eutectic silicon tensile properties

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Abstract

In the present investigation, the influence of addition of the rare earth element samarium (Sm) in different concentrations (0, 0.1, 0.3, 0.5, 0.7 and 0.9wt.%) on the microstructure and tensile properties of the Al-Si-Cu 319 alloy have been evaluated. Microstructural constituents such as SDAS of α-Al and characteristics of eutectic silicon particles were observed by optical microscopy. It was concluded from the findings that Sm addition reduces the size of secondary dendrite arm spacings (SDAS) and altered the morphology of the eutectic silicon particles from needle-like to lamellar and smaller segments. The tensile properties of the Al-Si-Cu 319 alloy improved with the concentration of Sm. It was found that the highest tensile properties were obtained at 0.7wt.% addition of Sm, i.e., 55.5% higher than unmodified 319 alloy. With the further addition of the Sm above 0.7wt.%, it does not improve the tensile properties of the alloy. This can be attributed to the precipitation of the brittle and needle like quaternary Sm-rich intermetallic compounds observed through Scanning electron microscopy.

Bibliography

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[2] Hernandez, F.C.R., Ramírez, J.M.H., Mackay, R. (2017). Al-Si alloys: automotive, aeronautical, and aerospace applications. Springer International Publishing. Retrieved 30 April 2022 from Springer link http://link.springer.com/10.1007/978-3-319-58380-8.
[3] Alkahtani, S. (2012). Mechanical performance of heat treated 319 alloys as a function of alloying and aging parameters. Materials & Design. 41, 358-369. https://doi.org/10.1016/j.matdes.2012.04.034.
[4] Javidani, M. & Larouche, D. (2014). Application of cast Al–Si alloys in internal combustion engine components. International Materials Reviews. 59(3), 132-158. https://doi.org/10.1179/1743280413Y.0000000027.
[5] Lombardi, A., Ravindran, C. & MacKay, R. (2015). Optimization of the solution heat treatment process to improve mechanical properties of 319 Al alloy engine blocks using the billet casting method. Materials Science and Engineering: A, 633, 125-135. https://doi.org/10.1016/j.msea.2015.02.076.
[6] Hegde, S. & Prabhu, K.N. (2008). Modification of eutectic silicon in Al–Si alloys. Journal of materials science. 43(9), 3009-3027. https://doi.org/10.1007/s10853-008-2505-5.
[7] Sigworth, G.K. (2008). The modification of Al-Si casting alloys: important practical and theoretical aspects. International Journal of Metalcasting. 2(2), 19-40. https://doi.org/10.1007/BF03355425.
[8] Mahmoud, M.G., Zedan, Y., Samuel, A.M., Doty, H.W., Songmene, V. & Samuel, F.H. (2021). Effect of rare earth metals (Ce and La) addition on the performance of Al-Si-Cu-Mg Cast Alloys. International Journal of Metalcasting. 1-27. https://doi.org/10.1007/s40962-021-00669-6.
[9] Mahmoud, M.G., Zedan, Y., Samuel, A.M., Songmene, V. & Samuel, F.H. (2022). The use of rare earth metals in Al–Si–Cu casting alloys. International Journal of Metalcasting. 16(2), 535-552. https://doi.org/10.1007/s40962-021-00640-5.
[10] Patel, D.N. & Sutaria, M.P. (2022). Effect of Trace Rare Earth Er Addition on Microstructure and Tensile Properties of 319 Al-Si-Cu Alloy. International Journal of Metalcasting. 16, 2199–2209. https://doi.org/10.1007/s40962-021-00730-4.
[11] Xu, C., Xiao, W., Hanada, S., Yamagata, H. & Ma, C. (2015). The effect of scandium addition on microstructure and mechanical properties of Al–Si–Mg alloy: A multi-refinement modifier. Materials Characterization. 110, 160-169. https://doi.org/10.1016/j.matchar.2015.10.030.
[12] Mao, F., Yan, G., Xuan, Z., Cao, Z. & Wang, T. (2015). Effect of Eu addition on the microstructures and mechanical properties of A356 aluminum alloys. Journal of Alloys and Compounds. 650, 896-906. https://doi.org/10.1016/j.jallcom.2015.06.266.
[13] Nie, Z.R., Jin, T., Fu, J., Xu, G., Yang, J., Zhou, J.X. & Zuo, T.Y. (2002). Research on rare earth in aluminum. Materials Science Forum. 396-402, 1731-1740. https://doi.org/10.4028/www.scientific.net/MSF.396-402.1731.
[14] Nie, Z. R., Fu, J.B., Zou, J.X., Jin, T.N., Yang, J.J., Xu, G. F., Ruan, H. Q. & Zuo, T.Y. (2004). Advanced aluminum alloys containing rare-earth erbium. Materials forum. 28, 197-201.
[15] Hu, Z., Yan, H. & Rao, Y.S. (2013). Effects of samarium addition on microstructure and mechanical properties of as-cast Al-Si-Cu alloy. Transactions of Nonferrous Metals Society of China. 23(11), 3228-3234. https://doi.org/10.1016/S1003-6326(13)62857-5.
[16] Qiu, H., Yan, H. & Hu, Z. (2014). Modification of near-eutectic Al–Si alloys with rare earth element samarium. Journal of Materials Research. 29, 1270-1277. https://doi.org/10.1557/jmr.2014.113.
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[18] Rao, Y., Yan, H., & Hu, Z.(2013). Modification of eutectic silicon and β-Al5FeSi phases in as-cast ADC12 alloys by using samarium addition. Journal of Rare Earths. 31(9), 916-922. https://doi.org/10.1016/S1002-0721(12)60379-2.
[19] Li, Q., Li, J., Li, B., Lan, Y. & Xia, T. (2018). Effect of samarium (Sm) addition on the microstructure and tensile properties of Al–20% Si casting alloy. International Journal of Metalcasting. 12, 554-564. https://doi.org/10.1007/s40962-017-0193-0.
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[22] Pandee, P., Patakham, U. & Limmaneevichitr, C. (2017). Microstructural evolution and mechanical properties of Al-7Si-0.3 Mg alloys with erbium additions. Journal of Alloys and Compounds. 728, 844-853. https://doi.org/10.1016/j.jallcom.2017.09.054.
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[29] Hume-Rothery, W., Smallman, R.E., Haworth, C.W. (1969). Structure of Metals and Alloys. London: Institute of Metals and the Institution of Metallurgists.

Authors and Affiliations

D.N. Patel

1

M.P. Sutaria

1

e-mail:

ORCID:

Department of Mechanical Engineering, Chandubhai S. Patel Institute of Technology, Charotar University of Science and Technology (CHARUSAT), Changa, Anand-388421, Gujarat, India

Crystallization of the Structural Components of Multiple Remelted AlSi9Cu3 Alloy

M. Matejka D. Bolibruchová M. Kuriš

Archives of Foundry Engineering | 2021 | vo. 21 | No 2 | 41-45 | DOI: 10.24425/afe.2021.136096

Keywords Al-Si-Cu Remelting Returnable material Structural components scanning electron microscope

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Abstract

At present, Al-Si-Cu based alloys (with a typical representative AlSi9Cu3 alloy) represent more than half of the castings used in various industries (automotive, aerospace and electrical engineering). These are most often sub-eutectic (exceptionally eutectic) alloys with a content of 6 to 13 wt. % Si and 1 to 5 wt. % Cu. The aim of the paper is to point out the importance of the evaluation of input raw materials that determines the overall properties of the casting and the costs invested in its production. A negative impact on performance can be expected when using an alloy made up of a high proportion of recycled material, despite its economic benefits. Experimental alloys were evaluated based on the results of crystallization process and a combination of scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX), and deep etching. The effect of remelting and increasing the remelted returnable material in the batch was manifested especially in the crystallization of iron-rich phases. The negative effect of remelting on the structural components was manifested after the fourth remelting. Gradual increase of remelted returnable material in the batch causes harmful changes in the crystallization process.

Bibliography

[1] Ciu, J. & Roven, H.J. (2010). Recycling of automotive aluminum. Transactions of Nonferrous Metals Society of China. 20, 2057-2063.
[2] Gaustad, G., Olivetti, E.A. & Kirchain, R. (2012). Improving aluminum recycling: A survey of sorting and impurity removal technologies. Resources Conservation and Recycling. 58, 79-87.
[3] Kasińska, J., Bolibruchová, D. & Matejka, M. (2020). The influence of remelting on the properties of AlSi9Cu3 alloy with higher iron content. Materials. 13, 575.
[4] Das, K.S. & Green, J.A.S. (2010). Aluminum Industry and Climate Change-Assessment and Responses. JOM: The Journal of The Minerals, Metals & Materials Society. 62, 27-31.
[5] Winczek, J., Gucwa, M., Mician, M. et al. (2019). The evaluation of the wear mechanism of high-carbon hardfacing layers. Archives of Metallurgy and Materials. 64 (3), 1111-1115
[6] Medlen, D. & Bolibruchová, D. (2012). The influence of remelting on the properties of AlSi6Cu4 alloy modified by antimony. Archives of Foundry Engineering. 12(1), 81-86.
[7] Martinec, D., Pastircak, R. & Kantorikova, E. (2020). Using of Technology Semisolid Squeeze Casting by Different Initial States of Material. Archives of Foundry Engineering. 20(1), 117-121.
[8] Campbell, J. (2011). Complete Casting Handbook: Metal Casting Processes, Metallurgy, Techniques and Design. Butterworth-Heinemann, Oxford, UK.
[9] Djurdjevic, M.B., Odanovic, Z. & Talijan, N. (2011). Characterization of the Solidification Path of AlSi5Cu (1-4 wt.%) Alloys Using Cooling Curve Analysis. JOM: The Journal of The Minerals, Metals & Materials Society. 63,11, 51-57.
[10] Lukač, I. (1981). Properties and structure of non-ferrous metals. ALFA Bratislava. (in Slovak).

Authors and Affiliations

M. Matejka

1

e-mail:

ORCID:

D. Bolibruchová

1

e-mail:

ORCID:

M. Kuriš

1

University of Zilina, Faculty of Mechanical Engineering, Department of Technological Engineering, Univerzitna 1, 010 26 Zilina, Slovak Republic

Study of the Properties of the AlSi9Cu3 Alloy Depending on the Ratio of Returnable Material in the Batch

M. Matejka D. Bolibruchová M. Chalupová

Archives of Metallurgy and Materials | 2021 | vol. 66 | No 1 | 15-23 | DOI: 10.24425/amm.2021.134753

Keywords Al-Si-Cu cast alloys natural and artificial ageing metallography mechanical properties hot tearing

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Abstract

Recycling of aluminium returnable material through its reuse is now an essential component of the production of aluminium alloy castings. The main goal is to find a suitable ratio of the primary alloy and the returnable material in the batch, thus determining the right compromise between the price and the quality of the casting. Experimental alloys were evaluated by thermal analysis, combination of structural analytical techniques and selected mechanical properties. The alloys were also subjected to tearing susceptibility testing. The increase in the returnable material amount resulted in changes in the alloy properties at the first increase in volume to 20%. After exceeding the balanced ratio (50:50), there was considerable degradation of the microstructure, failure to achieve the minimum values of some mechanical properties required by the standard, and the alloy showed increased susceptibility to tearing.

Authors and Affiliations

M. Matejka

e-mail:

ORCID:

D. Bolibruchová

e-mail:

ORCID:

M. Chalupová

e-mail:

ORCID:

Study of Susceptibility to Tearing of AlSi5Cu2Mg Alloy with Addition of Zr and Ti

M. Matejka D. Bolibruchová E. Kantoríková

Archives of Foundry Engineering | 2024 | vol. 24 | No 1 | 107-114 | DOI: 10.24425/afe.2024.149257

Keywords Al-Si-Cu-Mg alloy Hot tears Curve of load force Dendrite coherency point

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Abstract

The current trend of continuous improvement of various components constantly pushes the development of new materials forward. The basic goal of research into new and better materials is to improve their properties compared to the original material. One of the essential properties of the newly developed aluminum alloys is their resistance to the formation of tearing. Tears appear during the solidification of the casting and break the integrity due to tension arising while cooling. Several factors influence the susceptibility to tearing, but they can be minimized and reduce the chance of their occurrence. As part of the experiment, the AlSi5Cu2Mg alloy was evaluated in four material variants, without additives (in the reference state), with the addition of transition elements Zr, Ti and their combination Zr + Ti. Susceptibility to the formation of teras was assessed using a qualitative method supplemented by microscopic analysis of the tear profile and determination of the dendritic coherence temperature. The evaluation shows that the addition of Zr increased the susceptibility to tear formation. On the contrary, the addition of Ti had a positive effect and reduced the susceptibility to the formation of tears. The effect of the addition of Zr and Ti in the AlSi5Cu2Mg alloy showed a similar values as without the addition of alloys (reference condition). Microstructural analysis of the tear profile pointed to the negative influence of phases rich in Zr. The subsequent evaluation of the dendritic coherence temperature of individual AlSi5Cu2Mg alloys did not show a correlation with the results of a quantitative evaluation of susceptibility to tears.

Bibliography

[1] Bolibruchová, D. (2010). Foundry technology. Žilina: vydavateľstvo GEORG, ISBN 978-80-89401-14-7.
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Authors and Affiliations

M. Matejka

1

e-mail:

ORCID:

D. Bolibruchová

1

e-mail:

ORCID:

E. Kantoríková

1

e-mail:

ORCID:

University of Zilina, Faculty of Mechanical Engineering, Department of Technological Engineering, Slovak Republic

Identification and analysis of intermetallic phases in age-hardened recycled AISi9Cu3 cast alloy

Lenka Hurtalová Eva Tillová Mária Chalupová

Archive of Mechanical Engineering | 2012 | vol. 59 | No 4 | 385-396 | DOI: 10.2478/v10180-012-0020-3

Keywords Al-Si-Cu cast alloy age hardening Fe-rich intermetallic phase Cu-rich intermetallic phase mechanical properties

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Abstract

Purpose: The influence of age-hardening solution treatment at temperature 515 degrees centigrade with holding time 4 hours, water quenching at 40 degrees centigrade and artificial aging by different temperature 130, 150, 170 and 210 degrees centigrade with different holding time 2, 4, 8, 16 and 32 hours on changes in morphology of Fe-rich Al15(FeMn)3Si2and Cu-rich (Al2Cu, Al-Al2Cu-Si) intermetallic phases in recycled AlSi9Cu3 cast alloy. Material/Methods: Recycled (secondary) AlSi9Cu3 cast alloy is used especially in automotive industry (dynamic exposed cast, engine parts, cylinder heads, pistons and so on). Microstructure was observed using a combination of different analytical techniques (scanning electron microscopy upon standard and deep etching and energy dispersive X-ray analysis – EDX) which have been used for the identification of the various phases. Quantitative study of changes in morphology of phases was carried out using Image Analyzer software NIS-Elements. The mechanical properties (Brinell hardness and tensile strength) were measured in line with STN EN ISO. Results/Conclusion: Age-hardening led to changes in microstructure include the spheroidization of eutectic silicon, gradual disintegration, shortening and thinning of Fe-rich intermetallic phases and Al-Al2Cu-Si phases were fragmented, dissolved and redistributed within alpha-matrix. These changes led to increase in the hardness and tensile strength in the alloy.

Authors and Affiliations

Lenka Hurtalová

Eva Tillová

Mária Chalupová

1

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