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Determination of Duration and Sequence of Vacuum Pressure Saturation in Infiltrated MMC Castings

K. Gawdzińska D. Nagolska P. Szymański
Archives of Foundry Engineering | 2018 | vol.18 | No 1
Keywords MMC saturation Determination of process parameters Time of infiltration Gypsum mold
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Abstract

The paper presents a detailed description of one of the newest methods of vacuum saturation of reinforcing preforms in gypsum molds. As an appropriate selection of the infiltration time is a crucial problem during realization of this process, aim of the analysis shown in the paper is to present methods of selection of subatmospheric pressure application time, a sequence of lowering and increasing pressure, as well as examining influence of structure of reinforcing preforms on efficiency of this process. To realize the aim, studies on infiltration of reinforcing preforms made of a corundum sinter of various granulation of sintered particles with a model alloy were conducted. The infiltration process analysis was carried out in two stages. The first stage consisted in investigation of influence of lengthening of sucking off air from the reinforcing preforms on efficiency of this process. In the second stage, an analysis of influence of a two-staged infiltration process on saturation of the studied materials was conducted. Because the studied preforms were of similar porosity, the obtained differences of the saturation level of particular preforms have shown, that the saturation process is influenced mostly by size of pores present in the reinforcement. Because of these differences, each reinforcement type requires individual selection of time and sequence of the saturation process. For reinforcements of higher pore diameter, it is sufficient to simply increase air sucking off time to improve the saturation, while for reinforcement of smaller pore diameter, it is a better solution to apply the two-staged process of sucking off air. Application of the proposed analysis method allows not only obtaining composite castings of higher quality, but also economical optimization of the whole process.

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Authors and Affiliations

K. Gawdzińska
D. Nagolska
P. Szymański

A Comparative Study on Ex-Situ & In-Situ Formed Metal Matrix Composites

B. Gobalakrishnan C. Rajaravi Gobikrishnan Udhayakumar P.R. Lakshminarayanan
Archives of Metallurgy and Materials | 2023 | vol. 68 | No 1 | 171-185 | DOI: 10.24425/amm.2023.141491
Keywords MMCs Al-SiC Al-TiB2 Extrusion Heat treatment Mechanical properties Microstructure
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Abstract

An attempt has been made to synthesize the aluminium based ex-situ (Al-SiC) and in-situ (Al-TiB2) formed metal matrix composites with varying weight percentage of reinforcement contents such as 4wt.%, 6wt.% and 8wt.%. Synthesized composites were subjected to a cold extrusion process followed by heat treatment according to the ASTM B 918-01 standards. The mechanical properties of in-situ composites were evaluated as per the ASTM guidelines and compared with ex-situ formed composites and base metal properties. Superior properties were noticed in the in-situ formed composites and the mechanical properties such as yield strength, Ultimate tensile strength (UTS) and Hardness for both ex-situ and in-situ composites were found to increase with increasing the reinforcement addition. Cold extruded Al-8 wt.% SiC composite properties such as hardness, yield strength and UTS are 87 RB, 152 MPa, 216 MPa respectively. Whereas, for Al-8 wt.% TiB2 composite, the corresponding properties are 94 RB, 192 MPa, 293 MPa. The morphology of the composites is analysed by Optical and Scanning Electron Microscopic (SEM) whereas presence of reinforcement particles such SiC and TiB2 along with intermetallic phases Mg2Si and Al5FeSi are confirmed by EDX, XRD and Element Mapping analyses.
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Authors and Affiliations

B. Gobalakrishnan
1
C. Rajaravi
2
Gobikrishnan Udhayakumar
3
P.R. Lakshminarayanan
4
  1. CARE College of Engineering, Department of Mechanical Engineering, Trichy-620 009, Tamil Nadu, India
  2. Hindusthan College of Engineering and Technology, Coimbatore – 641 032, Tamilnadu, India
  3. Sona College of Technology, Department of Mechanical Engineering, Salem – 636 005, Tamil Nadu, India
  4. Annamalai University, Department of Manufacturing Engineering, Annamalai Nagar-608 002, Tamil Nadu, India

Manufacturing of Composite Castings by the Method of Fused Models Reinforced with Carbon Fibers Based on the Aluminum Matrix

P. Szymański
Archives of Foundry Engineering | 2023 | vol. 23 | No 3 | 118-123 | DOI: 10.24425/afe.2023.146670
Keywords Castings Metal matrix composite (MMC) AlSi matrix Casting by melted models
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Abstract

The paper presents an attempt to produce aluminum matrix composites reinforced with short carbon fibers by precision casting in a chamber with a pressure lower than atmospheric pressure. The composite casting process was preceded by tests related to the preparation of the reinforcement. This is related to the specificity of the precision casting process, in which the mold for shaping the castings is fired at a temperature of 720°C before pouring. Before the mold burns, the reinforcement must be inside, while the carbon fiber decomposes in the atmosphere at 396°C. In the experiment, the reinforcement in the form was secured with flake graphite and quartz sand. The performed firing procedure turned out to be effective. The obtained composite castings were evaluated in terms of the degree of alloy saturation and the displacement of carbon fibers. As a result of the conducted tests, it was found that as a result of unfavorable arrangement of fibers in the CF preform, the flow of metal may be blocked and porosity may appear in the casting.
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Bibliography

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Authors and Affiliations

P. Szymański
1
ORCID: ORCID
  1. Institute of Materials Technology, Poznan University of Technology, Piotrowo 3, 61-138 Poznań, Poland

Effect of Stir Casting Process Parameters and Stirrer Blade Geometry on Mechanical Properties of Al MMCs – A Review

Chintan Morsiya Shailesh Pandya
Archives of Metallurgy and Materials | 2023 | vol. 68 | No 4 | 1473-1495 | DOI: 10.24425/amm.2023.146214
Keywords Metal matrix composites (MMCs) Aluminium Mechanical properties Particle distribution Stirrer design
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Abstract

Aluminium matrix composites offer a combination of properties such as lower weight, higher strength, higher wear resistance and many more. The stir casting process is easy to use, involves low cost and is suitable for mass production compared to other manufacturing processes. An in-depth look at recently manufactured aluminium matrix composites and their impact on particle distribution, porosity, wettability, microstructure and mechanical properties of Al matrix composites have all been studied in relation to stirring parameters. Several significant concerns have been raised about the sample’s poor wettability, porosity and particle distribution. Mechanical, thermal, and tribological properties are frequently studied in conjunction with variations in reinforcement proportion but few studies on the effect of stirrer blade design and parameters such as stirrer shape, dimensions and position have been reported. To study the effect of stirrer blade design on particle distribution, computational fluid dynamics is used by rese­archers. Reported multiphysics models were k-ε model and the k-ω model for simulation. It is necessary to analyse these models to determine which one best solves the real-time problem. Stirrer design selection and analysis of its effect on particle distribution using simulation, while taking underlying physics into account, can be well-thought-out as a future area of research in the widely adopted stir casting field.
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Authors and Affiliations

Chintan Morsiya
1 2
ORCID: ORCID
Shailesh Pandya
1
ORCID: ORCID
  1. Sardar Vallabhbhai National Institute of Technology, Department of Mechanical Engineering, Surat, Gujarat, India
  2. Research Scholar, Departme nt of Mechanical Engineering, Sardar Vallabhbhai National Institute of Technology, Ichchhanath, Surat, 395007,Gujarat, India

Studies on Microstructural Evolution and Wear Behaviour of AlNi intermetallic Reinforced AA6061 alloy in T6 condition

J. Abuthakir R. Subramanian K. Somasundara Vinoth G. Venkatesh G. Suganya Priyadharshini K. Krishnakumar
Archives of Metallurgy and Materials | 2022 | vol. 67 | No 3 | 803-813 | DOI: 10.24425/amm.2022.139670
Keywords Al MMCs Peak aged (T6) condition Al-Ni intermetallic reinforced composites Adhesive wear
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Abstract

In the present investigation Ni particles were added in varying weight fractions (0.5, 1.0 and 1.5%) to AA6061 alloy during stir casting. To prepare Al-Ni intermetallic reinforced Aluminium Metal Matrix Composites (Al MMCs), as-cast samples were subjected to T6 treatment (Solutionization at 550°C followed by ageing at 2,4,6,8 and 10 hours). Base alloy was also subjected to T6 treatment for comparison purpose. Hardness of the samples were obtained using Vickers hardness test. Samples in the peak aged (T6) condition were subjected to metallographic examination. Influence of Ni particles on the hardness and grain refinement was investigated. X-ray Diffraction analysis of the Ni added samples revealed the presence of Al-Ni intermetallic phase formation in the peak aged (T6) Condition. Scanning Electron Microscope – Energy Dispersive X-Ray Spectroscopy analysis of composites in the peak aged (T6) condition were carried out to study the formation of the Al-Ni intermetallic phase. Effect of Al-Ni intermetallic phase on wear and friction behavior of the composite samples were studied and compared with that of the base alloy in the peak aged (T6) condition.
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Authors and Affiliations

J. Abuthakir
1
ORCID: ORCID
R. Subramanian
1
ORCID: ORCID
K. Somasundara Vinoth
2
ORCID: ORCID
G. Venkatesh
1
ORCID: ORCID
G. Suganya Priyadharshini
3
ORCID: ORCID
K. Krishnakumar
1
ORCID: ORCID
  1. Metallurgical Engineering, PSG College of Technology, India-641004
  2. Production Engineering, PSG College of Technology, India-641004
  3. Mechanical Engineering, Coimbatore Institute of Technology, India-641004

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