Matrix creep accommodation in diffusion controlled phase transformations

Although matrix creep accommodation occurs for a variety of diffusion controlled phase transformations, the focus is usually on the diffusion kinetics. However, interface control of kinetics, associated with the development of elastic stresses at a growing interface, is also possible. The displaceme...

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Bibliographic Details
Published in:Acta materialia 1996-02, Vol.44 (2), p.763-773
Main Authors: Williford, R.E., Henager, C.H., Hirth, J.P.
Format: Article
Language:English
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Summary:Although matrix creep accommodation occurs for a variety of diffusion controlled phase transformations, the focus is usually on the diffusion kinetics. However, interface control of kinetics, associated with the development of elastic stresses at a growing interface, is also possible. The displacement reaction Fe + Cu 2O → FeO + Cu is used as a model system to determine the role of such stresses. The reaction is shown to occur in a regime where the metal matrix phase undergoes either Nabarro-Herring or power law creep. The models developed herein to describe the interface and matrix stresses are tested on several diffusional phase transformations. The general results are that matrix stresses very near growing precipitates are often appreciable. The results have implications for the control of microstructure in in situ composites produced by such reactions.
ISSN:1359-6454
1873-2453
DOI:10.1016/1359-6454(95)00201-4