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Developing superplasticity in a magnesium AZ31 alloy by ECAP

Figueiredo, Roberto B. and Langdon, Terence G. (2008) Developing superplasticity in a magnesium AZ31 alloy by ECAP Journal of Materials Science, 43, (23-24), pp. 7366-7371. (doi:10.1007/s10853-008-2846-0).

Record type: Article

Abstract

The processing of a magnesium AZ31 alloy by equal-channel angular pressing refines the grain size to ~2.2 ?m, but annealing for 30 min at 673 K coarsens the grains to ~6.0 ?m. Despite this microstructural instability, the alloy is superplastic when pulled in tension at temperatures in the range of 623–723 K with elongations up to >1000% at strain rates at and below 10?4 s?1. Experiments within the superplastic regime show the strain rate sensitivity is ~0.5 and the activation energy is close to the value for grain boundary diffusion. It is demonstrated by calculation that the experimental results are in good agreement with a model for superplasticity based on grain boundary sliding.

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Published date: December 2008
Organisations: Engineering Mats & Surface Engineerg Gp

Identifiers

Local EPrints ID: 64572
URI: http://eprints.soton.ac.uk/id/eprint/64572
ISSN: 0022-2461
PURE UUID: 06dc8146-164e-4f5c-a93f-086921642a1e
ORCID for Terence G. Langdon: ORCID iD orcid.org/0000-0003-3541-9250

Catalogue record

Date deposited: 08 Jan 2009
Last modified: 17 Jul 2017 14:12

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Author: Roberto B. Figueiredo

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