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Thermally Activated Unpinning of Screw Dislocations in the Anomalous Regime in L12 Compounds

Published online by Cambridge University Press:  01 January 1992

M. Khantha ,
J. Cserti  and
V. Vitek
M. Khantha
Affiliation:
Department of Materials Science and Engineering University of Pennsylvania Philadelphia, PA 19104-6272.
J. Cserti
Affiliation:
Department of Materials Science and Engineering University of Pennsylvania Philadelphia, PA 19104-6272.
V. Vitek
Affiliation:
Department of Materials Science and Engineering University of Pennsylvania Philadelphia, PA 19104-6272.
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Abstract

We present a model for the anomalous increase of the yield stress exhibited by many L12 compounds. It is based on two thermally activated processes that describe respectively the pinning and unpinning of [101] screw dislocations in the (111) plane. The model explains all the important characteristic features observed in the anomalous regime. We discuss the applications of the model to Ni3Ga and Ni3(Al,Ta).

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 288: Symposium L – High-Temperature Ordered Intermetallic Alloys V , 1992 , 417
Copyright
Copyright © Materials Research Society 1995

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References

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