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Influence of pressing temperature on microstructural development in equal-channel angular pressing

Influence of pressing temperature on microstructural development in equal-channel angular pressing
Influence of pressing temperature on microstructural development in equal-channel angular pressing
Experiments were conducted to evaluate the influence of the pressing temperature when materials are processed by equal-channel angular pressing. The tests were conducted using samples of pure Al, an Al–3% Mg alloy and an Al–3% Mg–0.2% Sc alloy at temperatures up to 573 K. All samples were pressed to sufficiently high strains to give homogeneous microstructures. The results show two important effects. First, the measured grain size tends to increase with increasing pressing temperature. Second, grain refinement is achieved at all temperatures but there is a transition from arrays of high angle boundaries at the lower temperatures to low angle boundaries at temperatures at and above 473 K in pure Al and at 573 K in the Al–3% Mg alloy, whereas the Al–3% Mg–0.2% Sc alloy exhibits high angle boundaries at all pressing temperatures. The inability to achieve high angle boundaries at the higher pressing temperatures in these two materials is attributed to the higher rates of recovery which lead to dislocation annihilation rather than the absorption of dislocations into the subgrain walls.
aluminum alloys, equal-channel angular pressing, grain growth, microstructure, ultrafine grain sizes
0921-5093
100-106
Yamashita, A.
22a8dd39-9a5c-443f-97fc-e7109d0311ae
Yamaguchi, D.
a3dfdb6a-94ee-4a36-8d1e-51ac672c8b94
Horita, Z.
84a80017-cbaf-4713-8346-6f69ac7ea63e
Langdon, T.G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Yamashita, A.
22a8dd39-9a5c-443f-97fc-e7109d0311ae
Yamaguchi, D.
a3dfdb6a-94ee-4a36-8d1e-51ac672c8b94
Horita, Z.
84a80017-cbaf-4713-8346-6f69ac7ea63e
Langdon, T.G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86

Yamashita, A., Yamaguchi, D., Horita, Z. and Langdon, T.G. (2000) Influence of pressing temperature on microstructural development in equal-channel angular pressing. Materials Science and Engineering: A, 287 (1), 100-106. (doi:10.1016/S0921-5093(00)00836-4).

Record type: Article

Abstract

Experiments were conducted to evaluate the influence of the pressing temperature when materials are processed by equal-channel angular pressing. The tests were conducted using samples of pure Al, an Al–3% Mg alloy and an Al–3% Mg–0.2% Sc alloy at temperatures up to 573 K. All samples were pressed to sufficiently high strains to give homogeneous microstructures. The results show two important effects. First, the measured grain size tends to increase with increasing pressing temperature. Second, grain refinement is achieved at all temperatures but there is a transition from arrays of high angle boundaries at the lower temperatures to low angle boundaries at temperatures at and above 473 K in pure Al and at 573 K in the Al–3% Mg alloy, whereas the Al–3% Mg–0.2% Sc alloy exhibits high angle boundaries at all pressing temperatures. The inability to achieve high angle boundaries at the higher pressing temperatures in these two materials is attributed to the higher rates of recovery which lead to dislocation annihilation rather than the absorption of dislocations into the subgrain walls.

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More information

Published date: 15 July 2000
Keywords: aluminum alloys, equal-channel angular pressing, grain growth, microstructure, ultrafine grain sizes
Organisations: Engineering Mats & Surface Engineerg Gp

Identifiers

Local EPrints ID: 48646
URI: http://eprints.soton.ac.uk/id/eprint/48646
ISSN: 0921-5093
PURE UUID: 60d7f278-965d-4d28-b149-6d1cfd1e0d0f
ORCID for T.G. Langdon: ORCID iD orcid.org/0000-0003-3541-9250

Catalogue record

Date deposited: 08 Nov 2007
Last modified: 16 Mar 2024 03:28

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Contributors

Author: A. Yamashita
Author: D. Yamaguchi
Author: Z. Horita
Author: T.G. Langdon ORCID iD

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