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Erschienen in: Metallurgical and Materials Transactions A 1/2010

01.01.2010

Functionally Graded Al Alloy Matrix In-Situ Composites

verfasst von: S. Kumar, V. Subramaniya Sarma, B.S. Murty

Erschienen in: Metallurgical and Materials Transactions A | Ausgabe 1/2010

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Abstract

In the present work, functionally graded (FG) aluminum alloy matrix in-situ composites (FG-AMCs) with TiB2 and TiC reinforcements were synthesized using the horizontal centrifugal casting process. A commercial Al-Si alloy (A356) and an Al-Cu alloy were used as matrices in the present study. The material parameters (such as matrix and reinforcement type) and process parameters (such as mold temperature, mold speed, and melt stirring) were found to influence the gradient in the FG-AMCs. Detailed microstructural analysis of the composites in different processing conditions revealed that the gradients in the reinforcement modify the microstructure and hardness of the Al alloy. The segregated in-situ formed TiB2 and TiC particles change the morphology of Si particles during the solidification of Al-Si alloy. A maximum of 20 vol pct of reinforcement at the surface was achieved by this process in the Al-4Cu-TiB2 system. The stirring of the melt before pouring causes the reinforcement particles to segregate at the periphery of the casting, while in the absence of such stirring, the particles are segregated at the interior of the casting.

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Metadaten
Titel
Functionally Graded Al Alloy Matrix In-Situ Composites
verfasst von
S. Kumar
V. Subramaniya Sarma
B.S. Murty
Publikationsdatum
01.01.2010
Verlag
Springer US
Erschienen in
Metallurgical and Materials Transactions A / Ausgabe 1/2010
Print ISSN: 1073-5623
Elektronische ISSN: 1543-1940
DOI
https://doi.org/10.1007/s11661-009-0063-3

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