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

Rimma Ye Lapovok, Yuri Estrin, Michail V Popov, Stuart Rundell, Timothy Brendan Williams

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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.
Original languageEnglish
Pages (from-to)7372 - 7378
Number of pages6
JournalJournal of Materials Science
Volume43
Issue number23-24
DOIs
Publication statusPublished - 2008

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