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Effects of Elastic Anisotropy on the Anomalous Yield Behavior of Cubic Ordered Alloys*

Published online by Cambridge University Press:  28 February 2011

M. H. Yoo
M. H. Yoo*
Affiliation:
Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6117
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Abstract

The positive temperature dependence of yield stress in certain L12 and B2 alloys, e.g. Ni3Al and β′-CuZn, is analyzed on the basis of the nature of dislocation dissociations predicted by anisotropic elasticity theory. In the case of Ni3Al, the torque due to the tangential component of the elastic interaction between two superpartials is a major driving force for either the cross-slip pinning model or the force couplet model. The corresponding torque term is relatively unimportant in the B2 structure. The core transformation of individual superpartials may be important for the anomalous increase of yield stress in β′-CuZn.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 81: Symposium H – High-Temperature Ordered Intermetallic Alloys II , 1986 , 207
Copyright
Copyright © Materials Research Society 1987

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Footnotes

*

Research sponsored by the Division of Materials Sciences, U.S. Department of Energy under contract DE-ACO5-840R21400 with Martin Marietta Energy Systems, Inc.

References

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