Creep properties of an Al-2024 composite reinforced with SiC particulates
Creep properties of an Al-2024 composite reinforced with SiC particulates
Creep tests were conducted on an Al-2024 alloy reinforced with 15% SiC particulates. In this composite, as in earlier experiments on the unreinforced Al-2024 alloy, there is a continuous precipitation of fine particles throughout the tests. The creep behaviour of the composite reveals the presence of a threshold stress, and this stress depends upon both temperature and applied stress because more copious precipitation occurs in the more time-consuming tests conducted at the lower stress levels. The results for the composite are analysed using a procedure similar to that developed earlier for the unreinforced alloy. It is shown that the rate-controlling deformation mechanism is dislocation climb within the matrix alloy with a stress exponent of about 4.4 and an activation energy equal to that anticipated for lattice self-diffusion in pure aluminium.
aluminium alloys, creep, composites, threshold stress
39-47
Spigarelli, S.
caa20975-c35d-4b65-b9b4-5e57d47d0691
Cabibbo, M.
16ffa29d-1e25-4e9e-96d0-b5f0c200fca3
Evangelista, E.
eeabb5a5-7dd4-482c-83bd-54618a1e9db0
Langdon, T.G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
2002
Spigarelli, S.
caa20975-c35d-4b65-b9b4-5e57d47d0691
Cabibbo, M.
16ffa29d-1e25-4e9e-96d0-b5f0c200fca3
Evangelista, E.
eeabb5a5-7dd4-482c-83bd-54618a1e9db0
Langdon, T.G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Spigarelli, S., Cabibbo, M., Evangelista, E. and Langdon, T.G.
(2002)
Creep properties of an Al-2024 composite reinforced with SiC particulates.
Materials Science and Engineering: A, 328 (1-2), .
(doi:10.1016/S0921-5093(01)01698-7).
Abstract
Creep tests were conducted on an Al-2024 alloy reinforced with 15% SiC particulates. In this composite, as in earlier experiments on the unreinforced Al-2024 alloy, there is a continuous precipitation of fine particles throughout the tests. The creep behaviour of the composite reveals the presence of a threshold stress, and this stress depends upon both temperature and applied stress because more copious precipitation occurs in the more time-consuming tests conducted at the lower stress levels. The results for the composite are analysed using a procedure similar to that developed earlier for the unreinforced alloy. It is shown that the rate-controlling deformation mechanism is dislocation climb within the matrix alloy with a stress exponent of about 4.4 and an activation energy equal to that anticipated for lattice self-diffusion in pure aluminium.
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Published date: 2002
Keywords:
aluminium alloys, creep, composites, threshold stress
Organisations:
Engineering Sciences
Identifiers
Local EPrints ID: 23804
URI: http://eprints.soton.ac.uk/id/eprint/23804
ISSN: 0921-5093
PURE UUID: f64794df-1e4c-4537-adff-ff9ff7b03984
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Date deposited: 27 Mar 2006
Last modified: 16 Mar 2024 03:28
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Author:
S. Spigarelli
Author:
M. Cabibbo
Author:
E. Evangelista
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