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Journal of Materials Science

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01-12-2008 | Ultrafine-Grained Materials

Enhanced superplasticity of magnesium alloy AZ31 obtained through equal-channel angular pressing with back-pressure

Authors: R. Lapovok, Y. Estrin, M. V. Popov, S. Rundell, T. Williams

Published in: Journal of Materials Science | Issue 23-24/2008

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Abstract

Excellent superplastic elongations (in excess of 1,200%) were achieved in a commercial cast AZ31 alloy processed by low temperature equal-channel angular pressing (ECAP) with a back-pressure to produce a bimodal grain structure. In contrast, AZ31 alloy processed by ECAP at temperatures higher than 200 °C showed a reasonably uniform grain structure and relatively low ductility. It is suggested that a bimodal grain structure is advantageous because the larger grains contribute to strain hardening thus delaying the onset of necking, while grain boundary sliding associated with small grains provides a stabilizing effect due to enhanced strain rate sensitivity.

previous article Developing superplasticity in a magnesium AZ31 alloy by ECAP

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Title: Enhanced superplasticity of magnesium alloy AZ31 obtained through equal-channel angular pressing with back-pressure
Authors: R. Lapovok
Y. Estrin
M. V. Popov
S. Rundell
T. Williams
Publication date: 01-12-2008
Publisher: Springer US
Published in: Journal of Materials Science / Issue 23-24/2008
Print ISSN: 0022-2461
Electronic ISSN: 1573-4803
DOI: https://doi.org/10.1007/s10853-008-2685-z

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