Creep behaviour in the superplastic Pb-62% Sn eutectic
Creep behaviour in the superplastic Pb-62% Sn eutectic
The creep behaviour of the superplastic Pb-62% Sn eutectic was investigated for grain sizes from 5·8 to 14·5 μm and at temperatures in the range from 336 to 422 K. The results showed a sigmoidal relationship between strain rate and stress. At intermediate strain rates (∼ 10−5–10−2 sec−1), the stress exponent was ∼1·65, the exponent of the inverse grain size was ∼2·3, and the activation energy was similar to the value anticipated for grain boundary diffusion. At very low strain rates (≲10−5 sec−1), the stress exponent was ∼3·0, the exponent of the inverse grain size was ∼2·3, and the activation energy was similar to the value anticipated for lattice self-diffusion. The results are not entirely consistent with either of the two major theories of superplasticity, but suggest instead the sequential operation of two different deformation processes.
697-709
Mohamed, Farghalli A.
0d8f02a9-fb40-4e5a-9222-3aecf3e4a460
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
October 1975
Mohamed, Farghalli A.
0d8f02a9-fb40-4e5a-9222-3aecf3e4a460
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Mohamed, Farghalli A. and Langdon, Terence G.
(1975)
Creep behaviour in the superplastic Pb-62% Sn eutectic.
The Philosophical Magazine: A Journal of Theoretical Experimental and Applied Physics, 32 (4), .
(doi:10.1080/14786437508221614).
Abstract
The creep behaviour of the superplastic Pb-62% Sn eutectic was investigated for grain sizes from 5·8 to 14·5 μm and at temperatures in the range from 336 to 422 K. The results showed a sigmoidal relationship between strain rate and stress. At intermediate strain rates (∼ 10−5–10−2 sec−1), the stress exponent was ∼1·65, the exponent of the inverse grain size was ∼2·3, and the activation energy was similar to the value anticipated for grain boundary diffusion. At very low strain rates (≲10−5 sec−1), the stress exponent was ∼3·0, the exponent of the inverse grain size was ∼2·3, and the activation energy was similar to the value anticipated for lattice self-diffusion. The results are not entirely consistent with either of the two major theories of superplasticity, but suggest instead the sequential operation of two different deformation processes.
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Published date: October 1975
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Local EPrints ID: 489264
URI: http://eprints.soton.ac.uk/id/eprint/489264
ISSN: 0031-8086
PURE UUID: 1796b5ca-26a6-48c7-a505-c3e94f08457c
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Date deposited: 18 Apr 2024 16:52
Last modified: 19 Apr 2024 01:37
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Farghalli A. Mohamed
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