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Characterization of creep properties and creep textures in pure aluminum processed by equal-channel angular pressing

Characterization of creep properties and creep textures in pure aluminum processed by equal-channel angular pressing
Characterization of creep properties and creep textures in pure aluminum processed by equal-channel angular pressing
High-purity aluminum was processed by equal-channel angular pressing (ECAP) and then tested under creep conditions at 473 K. The results show conventional power-law creep with a stress exponent of n = 5 which is consistent with an intragranular dislocation process involving the glide and climb of dislocations. It is demonstrated that diffusion creep is not important in these tests because the ultrafine grains produced by ECAP are not stable at this temperature. Texture measurements were undertaken using the high-pressure preferred orientation neutron time-of-flight diffractometer and they reveal significant differences in the evolution of texture during creep in pressed and unpressed specimens. These experimental measurements of texture are in excellent agreement with theoretical textures predicted using a visco-plastic self-consistent model that limits deformation to plastic slip. The calculations provide additional confirmation that creep occurs through an intragranular dislocation process.
1359-6454
2307-2317
Kawasaki, Megumi
944ba471-eb78-46db-bfb7-3f0296d9ef6d
Beyerlein, Irene J.
92ba9452-af0f-4835-947c-98a622a69539
Vogel, Sven C.
cf6f2481-e39b-48d5-a80d-55e926de3d1f
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Kawasaki, Megumi
944ba471-eb78-46db-bfb7-3f0296d9ef6d
Beyerlein, Irene J.
92ba9452-af0f-4835-947c-98a622a69539
Vogel, Sven C.
cf6f2481-e39b-48d5-a80d-55e926de3d1f
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86

Kawasaki, Megumi, Beyerlein, Irene J., Vogel, Sven C. and Langdon, Terence G. (2008) Characterization of creep properties and creep textures in pure aluminum processed by equal-channel angular pressing. Acta Materialia, 56 (10), 2307-2317. (doi:10.1016/j.actamat.2008.01.023).

Record type: Article

Abstract

High-purity aluminum was processed by equal-channel angular pressing (ECAP) and then tested under creep conditions at 473 K. The results show conventional power-law creep with a stress exponent of n = 5 which is consistent with an intragranular dislocation process involving the glide and climb of dislocations. It is demonstrated that diffusion creep is not important in these tests because the ultrafine grains produced by ECAP are not stable at this temperature. Texture measurements were undertaken using the high-pressure preferred orientation neutron time-of-flight diffractometer and they reveal significant differences in the evolution of texture during creep in pressed and unpressed specimens. These experimental measurements of texture are in excellent agreement with theoretical textures predicted using a visco-plastic self-consistent model that limits deformation to plastic slip. The calculations provide additional confirmation that creep occurs through an intragranular dislocation process.

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More information

Published date: June 2008
Organisations: Engineering Mats & Surface Engineerg Gp

Identifiers

Local EPrints ID: 64326
URI: http://eprints.soton.ac.uk/id/eprint/64326
ISSN: 1359-6454
PURE UUID: b14e2f6f-1355-4fda-a146-4315c4c9e8db
ORCID for Terence G. Langdon: ORCID iD orcid.org/0000-0003-3541-9250

Catalogue record

Date deposited: 06 Jan 2009
Last modified: 16 Mar 2024 03:28

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Contributors

Author: Megumi Kawasaki
Author: Irene J. Beyerlein
Author: Sven C. Vogel

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