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Journal of Materials Science

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01-12-2008 | Ultrafine-Grained Materials

Developing superplasticity in a magnesium AZ31 alloy by ECAP

Authors: Roberto B. Figueiredo, Terence G. Langdon

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

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Abstract

The processing of a magnesium AZ31 alloy by equal-channel angular pressing refines the grain size to ~2.2 μm, but annealing for 30 min at 673 K coarsens the grains to ~6.0 μm. 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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Title: Developing superplasticity in a magnesium AZ31 alloy by ECAP
Authors: Roberto B. Figueiredo
Terence G. Langdon
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/s10853-008-2846-0

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