Developing superplasticity in a magnesium AZ31 alloy by ECAP
Developing superplasticity in a magnesium AZ31 alloy by ECAP
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.
7366-7371
Figueiredo, Roberto B.
2e0060b8-6368-4d87-825a-c3cb90e92145
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
December 2008
Figueiredo, Roberto B.
2e0060b8-6368-4d87-825a-c3cb90e92145
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Figueiredo, Roberto B. and Langdon, Terence G.
(2008)
Developing superplasticity in a magnesium AZ31 alloy by ECAP.
Journal of Materials Science, 43 (23-24), .
(doi:10.1007/s10853-008-2846-0).
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.
This record has no associated files available for download.
More information
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
Catalogue record
Date deposited: 08 Jan 2009
Last modified: 16 Mar 2024 03:28
Export record
Altmetrics
Contributors
Author:
Roberto B. Figueiredo
Download statistics
Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.
View more statistics
