Evaluating the superplastic flow of a magnesium AZ31 alloy processed by equal-channel angular pressing
Evaluating the superplastic flow of a magnesium AZ31 alloy processed by equal-channel angular pressing
Experiments show that the magnesium AZ31 (Mg-3 pct Al-1 pct Zn) alloy exhibits excellent superplastic properties at 623 K (350 °C) after processing by equal-channel angular pressing using a die with a channel angle of 135 deg and a range of decreasing processing temperatures from 473 K to 413 K (200 °C to 140 °C). A maximum elongation to failure of ~1200 pct was achieved in this alloy at a tensile strain rate of 1.0 × 10?4 s?1. Microstructural inspection showed evidence for cavity formation and grain growth during tensile testing with the grain growth leading to significant strain hardening. An examination of the experimental data shows that grain boundary sliding is dominant during superplastic flow. Furthermore, a comprehensive review of the present results and extensive published data for the AZ31 alloy shows the exponent of the inverse grain size is given by p ? 2 which is consistent with grain boundary sliding as the rate-controlling flow mechanism.
3197-3204
Figueiredo, Roberto B.
2e0060b8-6368-4d87-825a-c3cb90e92145
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
2014
Figueiredo, Roberto B.
2e0060b8-6368-4d87-825a-c3cb90e92145
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Figueiredo, Roberto B. and Langdon, Terence G.
(2014)
Evaluating the superplastic flow of a magnesium AZ31 alloy processed by equal-channel angular pressing.
Metallurgical and Materials Transactions A, 45 (8), .
(doi:10.1007/s11661-013-1920-7).
Abstract
Experiments show that the magnesium AZ31 (Mg-3 pct Al-1 pct Zn) alloy exhibits excellent superplastic properties at 623 K (350 °C) after processing by equal-channel angular pressing using a die with a channel angle of 135 deg and a range of decreasing processing temperatures from 473 K to 413 K (200 °C to 140 °C). A maximum elongation to failure of ~1200 pct was achieved in this alloy at a tensile strain rate of 1.0 × 10?4 s?1. Microstructural inspection showed evidence for cavity formation and grain growth during tensile testing with the grain growth leading to significant strain hardening. An examination of the experimental data shows that grain boundary sliding is dominant during superplastic flow. Furthermore, a comprehensive review of the present results and extensive published data for the AZ31 alloy shows the exponent of the inverse grain size is given by p ? 2 which is consistent with grain boundary sliding as the rate-controlling flow mechanism.
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Accepted/In Press date: 2 August 2013
Published date: 2014
Organisations:
Engineering Mats & Surface Engineerg Gp
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Local EPrints ID: 368094
URI: http://eprints.soton.ac.uk/id/eprint/368094
ISSN: 1073-5623
PURE UUID: f430bc8b-699e-4c01-9768-62a3db585725
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Date deposited: 02 Sep 2014 16:41
Last modified: 15 Mar 2024 03:13
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Author:
Roberto B. Figueiredo
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