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Evidence of cooperative grain boundary sliding in superplastically deformed γ-TiAl

Published online by Cambridge University Press:  03 March 2011

M.G. Zelin ,
W.B. Lee  and
A.K. Mukherjee
M.G. Zelin
Affiliation:
Department of Chemical Engineering and Materials Science, University of California, Davis, California 95616
W.B. Lee
Affiliation:
Department of Chemical Engineering and Materials Science, University of California, Davis, California 95616
A.K. Mukherjee
Affiliation:
Department of Chemical Engineering and Materials Science, University of California, Davis, California 95616
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Abstract

A study of the prepolished surface of γ-TiAl specimens superplastically deformed in tension showed evidence of macroscopic surfaces at which grain boundary sliding occurs. In a scanning electron microscope these surfaces are observed as black bands on the deformed surface because of the difference in the appearance of these bands and grain regions situated in between these bands. It has been suggested that cooperative grain boundary sliding, i.e., sliding of grain groups, occurs during superplastic deformation, giving rise to these bands.

Type
Rapid Communications
Information
Journal of Materials Research , Volume 9 , Issue 10 , October 1994 , pp. 2467 - 2469
Copyright
Copyright © Materials Research Society 1994

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References

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