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Microsegregation to Antiphase Boundaries in Monolithic γ′ Phase with Ternary Additions

Published online by Cambridge University Press:  26 February 2011

Y. P. Wu ,
J. M. Sanchez  and
J. K. Tien
Y. P. Wu
Affiliation:
Center for Strategic Materials and Henry Krumb School of Mines, Columbia University, New York, NY 10027
J. M. Sanchez
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 microsegregation to (111) anti-phase boundaries of the constituents and of the ternary atoms in monolithic γ′ phase is modeled using the tetrahedron approximation of the Cluster Variation Method. Similar to the binary case, alloy stoichiometry and temperature play an important role in determining the type and degree of atomic segregation to anti-phase boundaries. For a given composition, the segregation phenomenon is also found to be dependent on the site preference of the ternary additions. The results of our calculations are also used in order to assess the contribution of anti-phase boundary dislocation dragging to the strength of γ′ intermetallics.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 133: Symposium H – High-Temperature Ordered Intermetallic Alloys III , 1988 , 119
Copyright
Copyright © Materials Research Society 1989

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References

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