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Correlations Between Arrangement of Reinforcing Particles and Mechanical Properties in Pressure Die Cast AlSi11-SiC Composites

Z. Konopka M. Łągiewka A. Zyska A. Pasieka M. Nadolski
Archives of Foundry Engineering | 2014 | No 2 | DOI: 10.2478/afe-2014-0032
Keywords mechanical properties Pressure die casting structure Metal matrix composites (MMCs) aluminium alloy
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Abstract

The work presents the investigation results concerning the structure of composite pressure die castings with AlSi11 alloy matrix reinforced

with SiC particles. Examination has been held for composites containing 10 and 20 volume percent of SiC particles. The arrangement of

the reinforcing particles within the matrix has been qualitatively assessed in specimens cut out of the castings. The index of distribution

was determined on the basis of particle count in elementary measuring fields. The tensile strength, the yield point and elongation of the

obtained composite were measured. Composite castings were produced at various values of the piston velocity in the second stage of

injection, diverse intensification pressure values, and various injection gate width values. The regression equation describing the change of

the considered arrangement particles index and mechanical properties were found as a function of the pressure die casting parameters. The

infuence of particle arrangement in composite matrix on mechanical properties these material was examined and the functions of

correlations between values were obtained. The conclusion gives the analysis and the interpretation of the obtained results.

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Authors and Affiliations

Z. Konopka
M. Łągiewka
A. Zyska
A. Pasieka
M. Nadolski

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

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