An analysis of flow mechanisms in high temperature creep and superplasticity
An analysis of flow mechanisms in high temperature creep and superplasticity
The flow of crystalline solids at elevated temperatures is dependent upon creep mechanisms associated with the movement of dislocations, the relative displacements of adjacent grains and the stress-directed flow of vacancies. It is convenient to express the steady-state creep rate in terms of the dependences of these various creep mechanisms on the applied stress, the testing temperature and the grain size of the material. In practice, however, there are similarities in some of the predicted dependences for different creep processes and this may lead to experimental difficulties in unambiguously identifying the rate-controlling creep mechanism. The difficulties in identifying the creep mechanism become especially significant at low stresses. This paper reviews the characteristics of the various flow processes occurring in simple metallic systems such as pure metals and metallic alloys and describes procedures that may be adopted to provide an unambiguous identification of the rate-controlling flow mechanism.
creep mechanisms, diffusion creep, grain boundary sliding, harper--dorn creep, superplasticity
1951-1956
Langdon, T.G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
2005
Langdon, T.G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Langdon, T.G.
(2005)
An analysis of flow mechanisms in high temperature creep and superplasticity.
Materials Transactions, 46 (9), .
Abstract
The flow of crystalline solids at elevated temperatures is dependent upon creep mechanisms associated with the movement of dislocations, the relative displacements of adjacent grains and the stress-directed flow of vacancies. It is convenient to express the steady-state creep rate in terms of the dependences of these various creep mechanisms on the applied stress, the testing temperature and the grain size of the material. In practice, however, there are similarities in some of the predicted dependences for different creep processes and this may lead to experimental difficulties in unambiguously identifying the rate-controlling creep mechanism. The difficulties in identifying the creep mechanism become especially significant at low stresses. This paper reviews the characteristics of the various flow processes occurring in simple metallic systems such as pure metals and metallic alloys and describes procedures that may be adopted to provide an unambiguous identification of the rate-controlling flow mechanism.
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Published date: 2005
Keywords:
creep mechanisms, diffusion creep, grain boundary sliding, harper--dorn creep, superplasticity
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Local EPrints ID: 23829
URI: http://eprints.soton.ac.uk/id/eprint/23829
ISSN: 1347-5320
PURE UUID: 6dc50078-d240-46e0-aaa9-d80eaa188d8d
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Date deposited: 22 Mar 2006
Last modified: 28 Apr 2022 01:50
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