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Grain refinement and superplasticity in a magnesium alloy processed by equal-channel angular pressing

Grain refinement and superplasticity in a magnesium alloy processed by equal-channel angular pressing
Grain refinement and superplasticity in a magnesium alloy processed by equal-channel angular pressing
The extrusion/equal channel angular pressing (EX-ECAP) processing procedure, in which magnesium-based alloys are subjected to extrusion followed by ECAP, was applied to a Mg-7.5 pct Al-0.2 pct Zr alloy prepared by casting. Microstructural inspection showed the EX-ECAP process was effective in reducing the grain size from ~21 ?m after extrusion to an as-pressed grain size of ~0.8 ?m. It is shown through static annealing that these ultrafine grains are reasonably stable up to 473 K, but grain growth occurs at higher temperatures. Tensile specimens were cut from the billets prepared by EX-ECAP and testing showed these specimens exhibited superplasticity at relatively low temperatures with maximum elongations up to >700 pct. By processing through EX-ECAP to a higher imposed strain and thereby increasing the area fraction of high-angle boundaries, it is demonstrated that there is a potential for achieving high-strain-rate superplasticity.
1073-5623
1705-1711
Miyahara, Yuichi
d321d6d3-553f-42a1-a3c0-7d12cc3101e6
Matsubara, Kiyoshi
579ced78-f40d-4ec1-8680-d02e2cf5b61f
Horita, Zenji
011521b8-3b29-494b-bf3f-346827ddbcce
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Miyahara, Yuichi
d321d6d3-553f-42a1-a3c0-7d12cc3101e6
Matsubara, Kiyoshi
579ced78-f40d-4ec1-8680-d02e2cf5b61f
Horita, Zenji
011521b8-3b29-494b-bf3f-346827ddbcce
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86

Miyahara, Yuichi, Matsubara, Kiyoshi, Horita, Zenji and Langdon, Terence G. (2005) Grain refinement and superplasticity in a magnesium alloy processed by equal-channel angular pressing. Metallurgical and Materials Transactions A, 36A (7), 1705-1711.

Record type: Article

Abstract

The extrusion/equal channel angular pressing (EX-ECAP) processing procedure, in which magnesium-based alloys are subjected to extrusion followed by ECAP, was applied to a Mg-7.5 pct Al-0.2 pct Zr alloy prepared by casting. Microstructural inspection showed the EX-ECAP process was effective in reducing the grain size from ~21 ?m after extrusion to an as-pressed grain size of ~0.8 ?m. It is shown through static annealing that these ultrafine grains are reasonably stable up to 473 K, but grain growth occurs at higher temperatures. Tensile specimens were cut from the billets prepared by EX-ECAP and testing showed these specimens exhibited superplasticity at relatively low temperatures with maximum elongations up to >700 pct. By processing through EX-ECAP to a higher imposed strain and thereby increasing the area fraction of high-angle boundaries, it is demonstrated that there is a potential for achieving high-strain-rate superplasticity.

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Published date: 2005

Identifiers

Local EPrints ID: 23832
URI: http://eprints.soton.ac.uk/id/eprint/23832
ISSN: 1073-5623
PURE UUID: 853b6be8-efb3-48d5-8c46-d25bb434c1ef
ORCID for Terence G. Langdon: ORCID iD orcid.org/0000-0003-3541-9250

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Date deposited: 22 Mar 2006
Last modified: 27 Apr 2022 01:44

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Contributors

Author: Yuichi Miyahara
Author: Kiyoshi Matsubara
Author: Zenji Horita

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