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A Superplasticity Theory based on Dynamic Grain Growth

Published online by Cambridge University Press:  10 February 2011

M.J. Mayo  and
J.R. Seidensticker
M.J. Mayo
Affiliation:
Dept. Materials Science & EngineeringThe Pennsylvania State University University Park, PA 16802 mayo@ems.psu.edu; Joseiden@aol.com
J.R. Seidensticker
Affiliation:
Dept. Materials Science & EngineeringThe Pennsylvania State University University Park, PA 16802 mayo@ems.psu.edu; Joseiden@aol.com
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Abstract

The linear relation between dynamic grain growth rate and strain rate appears to be constant across all superplastic materials—regardless of whether the system examined is metallic or ceramic, and regardless of the stress exponent exhibited during deformation. The simplicity and universality of the dynamic grain growth law suggest it might be useful as a foundation for a theory for superplasticity. One attempt at such a theory is presented. It is argued that stress leads to the development of anisotropic grain shapes that then require recovery through directionally biased grain growth events. Once this mathematical relationship between stress and grain growth rate is developed, it is inserted into the existing dynamic grain growth - strain rate law to arrive at a phenomenological law for superplasticity.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 601: Symposium HH – Superplasticity-Current Status & Future Potential , 1999 , 181
Copyright
Copyright © Materials Research Society 2000

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