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).


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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.

Item Type: Article
Digital Object Identifier (DOI): doi:10.1007/s10853-008-2846-0
ISSNs: 0022-2461 (print)
Organisations: Engineering Mats & Surface Engineerg Gp
ePrint ID: 64572
Date :
Date Event
December 2008Published
Date Deposited: 08 Jan 2009
Last Modified: 16 Apr 2017 17:19
Further Information:Google Scholar

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