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Microstructural Evolution During Superplastic Deformation of Titanium Aluminides

Published online by Cambridge University Press:  01 January 1992

H.S. Yang,
M.G. Zelin and
A.K. Mukherjee
H.S. Yang
Affiliation:
Department of Mechanical, Aeronautical and Materials Engineering University of California, Davis, CA 95616, U.S.A.
M.G. Zelin
Affiliation:
Department of Mechanical, Aeronautical and Materials Engineering University of California, Davis, CA 95616, U.S.A.
A.K. Mukherjee
Affiliation:
Department of Mechanical, Aeronautical and Materials Engineering University of California, Davis, CA 95616, U.S.A.
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Abstract

Microstructural studies have been performed on two superplastically deformed Ti3Al-based alloys, regular α2 and super α2. Dynamic grain growth, formation of phase stringers, and changes in the apparent volume fraction of the phases occurred in both alloys. The lath-like α2 phase in the super α2 alloy broke up during deformation. All these features are examined from the viewpoint of cooperative grain boundary sliding (CGBS). Cooperative grain boundary migration (CGBM), which is coupled with CGBS, is proposed to be the mechanism for strain induced grain growth and changes in the phase volume fraction.

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References

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