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An Experimental Study of Cavity Nucleation During Superplastic Deformation

Published online by Cambridge University Press:  16 February 2011

Jiang Xinggang ,
Cui Jianzhong  and
Ma Longxiang
Jiang Xinggang
Affiliation:
Northeast University of Technology, Department of Metal Forming, Shenyang 11006, P.O. Box 317, P.R.China.
Cui Jianzhong
Affiliation:
Northeast University of Technology, Department of Metal Forming, Shenyang 11006, P.O. Box 317, P.R.China.
Ma Longxiang
Affiliation:
Northeast University of Technology, Department of Metal Forming, Shenyang 11006, P.O. Box 317, P.R.China.
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Abstract

Cavity nucleation during superplastic deformation of a high strength aluminium alloy has been studied using a high voltage electron microscope and an optical microscope. The results show that cavities nucleation is due only to superplastic deformation and not to pre-existing microvoids which may be introduced during thermomechanical processing. The main reason for cavity nucleation is the high stress concentration at discontinuties in the plane of the grain boundary due to grain boundary sliding.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 196: Symposium T – Superplasticity in Metals, Ceramics, and Intermetallics , 1990 , 51
Copyright
Copyright © Materials Research Society 1990

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References

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