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Evolution of microhardness and microstructure in a cast Al–7 % Si alloy during high-pressure torsion

Mungole, Tarang and Nadammal, Naresh and Dawra, Kunal and Kumar, Praveen and Kawasaki, Megumi and Langdon, Terence G (2013) Evolution of microhardness and microstructure in a cast Al–7 % Si alloy during high-pressure torsion. In: Journal of Materials Science, 48 (13). pp. 4671-4680.

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Official URL: http://dx.doi.org/10.1007/s10853-012-7061-3

Abstract

Disks of a cast Al-7 % Si alloy were processed through high-pressure torsion (HPT) for 1/4, 1/2, 1, 5, and 10 revolutions under a pressure of 6.0 GPa and at temperatures of 298 and 445 K. The hardness of the samples after processing was significantly higher than in the cast sample, and the hardness profiles across the samples became more uniform with increasing numbers of turns. Processing at higher temperature gave lower hardness values. Experiments were conducted to examine the effects of HPT processing on various microstructural aspects of the cast Al-7 % Si alloy such as the grain size, the Taylor factor, and the fraction of high-angle grain boundaries. The results demonstrate that there is a correlation between trends in the microhardness values and the observed microstructures.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Springer.
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Depositing User: Id for Latest eprints
Date Deposited: 30 May 2013 11:31
Last Modified: 30 May 2013 11:31
URI: http://eprints.iisc.ac.in/id/eprint/46512

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