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Modeling of Antiphase Boundaries in L12 Structures

Published online by Cambridge University Press:  28 February 2011

J.M. Sanchez ,
S. Eng ,
Y.P. Wu  and
J.K. Tien
J.M. Sanchez
Affiliation:
Center for Strategic Materials and Henry Krumb School of Mines Columbia University, New York, NY 10027
S. Eng
Affiliation:
Center for Strategic Materials and Henry Krumb School of Mines Columbia University, New York, NY 10027
Y.P. Wu
Affiliation:
Center for Strategic Materials and Henry Krumb School of Mines Columbia University, New York, NY 10027
J.K. Tien
Affiliation:
Center for Strategic Materials and Henry Krumb School of Mines Columbia University, New York, NY 10027
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Abstract

The thermodynamic properties of conservative (111) antiphase boundaries in L12 ordered structures are modeled using the tetrahedron approximation of the cluster variation method. The concentration and long-range order parameter profiles are determined as a function of temperature and composition of the bulk alloy. Characteristic wetting transitions, with a macroscopic disordered layer growing from the antiphase boundary as the transition temperature is approached, are found for all cases investigated. The effectof antiphase boundaries on the disordering of ordered alloys and on the gliding of superdislocations are discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 81: Symposium H – High-Temperature Ordered Intermetallic Alloys II , 1986 , 57
Copyright
Copyright © Materials Research Society 1987

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References

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