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Stacking Fault Energies, Crystal Elasticity and Their Relation to the Mechanical Properties of L12-Ordered Alloys

Published online by Cambridge University Press:  26 February 2011

C. L. Fu  and
M. H. Yoo
C. L. Fu
Affiliation:
Metals and Ceramics Division, Oak Ridge National Laboratory, P. O. Box 2008, Oak Ridge, TN 37831-6114
M. H. Yoo
Affiliation:
Metals and Ceramics Division, Oak Ridge National Laboratory, P. O. Box 2008, Oak Ridge, TN 37831-6114
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Abstract

First-principles calculations of the stacking fault energies of Ni3Al, and the linear elastic constants of Ni3Al and Pt3Al are presented. The anomalous (positive) temperature dependence of flow stress in Ni3Al and its absence in Pt3Al are fully rationalized in terms of the present results and cross-slip pinning mechanism. It is found that the elastic shear anisotropy factor plays an equally (or even more) important role than the anisotropy of antiphase-phase boundary energy in determining the plastic flow behavior of L12-ordered alloys.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 133: Symposium H – High-Temperature Ordered Intermetallic Alloys III , 1988 , 81
Copyright
Copyright © Materials Research Society 1989

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References

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