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Principles of grain refinement and superplastic flow in magnesium alloys processed by ECAP

Principles of grain refinement and superplastic flow in magnesium alloys processed by ECAP
Principles of grain refinement and superplastic flow in magnesium alloys processed by ECAP
The superplastic properties of metallic materials are associated with the length scale and with the thermal stability of their grain structure. Whereas equal-channel angular pressing (ECAP) may be used to produce ultrafine-grained structures in f.c.c. metals through the homogeneous subdivision of the grains, research on two magnesium alloys reveals a different and heterogeneous process of grain refinement which is dependent upon the initial grain structure in the alloys. Experiments demonstrate that different structural features may be achieved using different processing routes and this leads to the development of a processing strategy for achieving an optimum microstructure. It is shown by mechanical testing that the optimum superplastic properties also depend on the processing route and, depending on the structural characteristics, the maximum elongations to failure may occur either in the early stages of processing by ECAP or after processing through large strains
equal-channel angular pressing, grain refinement, magnesium alloys, processing routes, superplasticity
0921-5093
105-114
Figueiredo, Roberto B.
2e0060b8-6368-4d87-825a-c3cb90e92145
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Figueiredo, Roberto B.
2e0060b8-6368-4d87-825a-c3cb90e92145
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86

Figueiredo, Roberto B. and Langdon, Terence G. (2009) Principles of grain refinement and superplastic flow in magnesium alloys processed by ECAP. Materials Science and Engineering: A, 501 (1-2), 105-114. (doi:10.1016/j.msea.2008.09.058).

Record type: Article

Abstract

The superplastic properties of metallic materials are associated with the length scale and with the thermal stability of their grain structure. Whereas equal-channel angular pressing (ECAP) may be used to produce ultrafine-grained structures in f.c.c. metals through the homogeneous subdivision of the grains, research on two magnesium alloys reveals a different and heterogeneous process of grain refinement which is dependent upon the initial grain structure in the alloys. Experiments demonstrate that different structural features may be achieved using different processing routes and this leads to the development of a processing strategy for achieving an optimum microstructure. It is shown by mechanical testing that the optimum superplastic properties also depend on the processing route and, depending on the structural characteristics, the maximum elongations to failure may occur either in the early stages of processing by ECAP or after processing through large strains

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More information

Published date: February 2009
Keywords: equal-channel angular pressing, grain refinement, magnesium alloys, processing routes, superplasticity
Organisations: Engineering Mats & Surface Engineerg Gp

Identifiers

Local EPrints ID: 67345
URI: https://eprints.soton.ac.uk/id/eprint/67345
ISSN: 0921-5093
PURE UUID: 1277eaa6-4518-4420-a318-4a68374f115d
ORCID for Terence G. Langdon: ORCID iD orcid.org/0000-0003-3541-9250

Catalogue record

Date deposited: 19 Aug 2009
Last modified: 06 Jun 2018 12:48

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