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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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.
|Subjects:||T Technology > TN Mining engineering. Metallurgy|
|Divisions:||University Structure - Pre August 2011 > School of Engineering Sciences > Engineering Materials & Surface Engineering
|Date Deposited:||08 Jan 2009|
|Last Modified:||01 Jun 2011 12:23|
|RDF:||RDF+N-Triples, RDF+N3, RDF+XML, Browse.|
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