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), 7366-7371. (doi:10.1007/s10853-008-2846-0).

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Description/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.

Item Type: Article
ISSNs: 0022-2461 (print)
Related URLs:
Subjects: T Technology > TN Mining engineering. Metallurgy
Divisions: University Structure - Pre August 2011 > School of Engineering Sciences > Engineering Materials & Surface Engineering
ePrint ID: 64572
Date Deposited: 08 Jan 2009
Last Modified: 27 Mar 2014 18:46
URI: http://eprints.soton.ac.uk/id/eprint/64572

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