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A Re-Appraisal of Cavity Growth Processes in Superplasticity

Published online by Cambridge University Press:  16 February 2011

Yan Ma  and
Terence G. Langdon
Yan Ma
Affiliation:
Departments of Materials Science and Mechanical Engineering, University of Southern California, Los Angeles, CA 90089-1453
Terence G. Langdon
Affiliation:
Departments of Materials Science and Mechanical Engineering, University of Southern California, Los Angeles, CA 90089-1453
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Abstract

It is well known that cavities are nucleated and grow during the superplastic deformation of many materials. The various theories for cavity growth are examined with special emphasis on the role of growth by diffusion. It is demonstrated that the normal model for the diffusion growth of cavities is inadequate for superplastic materials when the grain boundary lengths are very small. By developing a new model for the growth of an isolated cavity to sizes exceeding the grain size, it is shown that the diffusion process may play a major role in cavity growth under a range of experimental conditions.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 196: Symposium T – Superplasticity in Metals, Ceramics, and Intermetallics , 1990 , 39
Copyright
Copyright © Materials Research Society 1990

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References

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