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The Role of Grain Boundaries in the Deformation and Failure of a Superplastic Al-Li Alloy

Published online by Cambridge University Press:  26 February 2011

Atul H. Chokshi  and
Amiya K. Mukherjee
Atul H. Chokshi
Affiliation:
Division of Materials Science and Engineering, Department of Mechanical Engineering, University of California, Davis, CA 95616
Amiya K. Mukherjee
Affiliation:
Division of Materials Science and Engineering, Department of Mechanical Engineering, University of California, Davis, CA 95616
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Abstract

The large elongations associated with superplasticity are observed only in materials with fine grain sizes. An Al-Li alloy processed thermomechanically to develop a fine grain size exhibits superplastic characteristics and large elongations to failure of up to ∼900%. Measurements at large elongations reveal that the grain boundary sliding contribution to superplastic deformation is ∼75%. Microstructural inspection of superplastically deformed specimens reveals also the occurrence of extensive cavitation.

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Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 122: Symposium I – Interfacial Structure, Properties, and Design , 1988 , 413
Copyright
Copyright © Materials Research Society 1988

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References

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