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Solute-atom segregation is high-angle (002) twist boundaries in dilute Au–Pt alloys

Published online by Cambridge University Press:  03 March 2011

D. Udler  and
D.N. Seidman
D. Udler
Affiliation:
Department of Materials Science and Engineering and Materials Research Center, R. R. McCormick School of Engineering and Applied Science, Northwestern University, Evanston, Illinois 60208-3108
D.N. Seidman
Affiliation:
Department of Materials Science and Engineering and Materials Research Center, R. R. McCormick School of Engineering and Applied Science, Northwestern University, Evanston, Illinois 60208-3108
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Abstract

Solute-atom segregation is studied by Monte Carlo simulations for three high-angle symmetrical (002) twist boundaries in Au-1 at. % Pt and Pt-1 at. % Au alloys at T = 850 K. It complements our previous study, that focused mainly on low-angle boundaries in the same alloys. Solute enhancement occurs on the Pt-rich side of the phase diagram, while on the Au-rich side net depletion in solute is observed. Following the trend observed for low-angle boundaries, Au as a solute prefers the structural units of the perfect crystal type, while Pt as a solute is depleted at those sites. The solutc concentration at structural units depends on the planar fraction of those units in the boundary.

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Articles
Information
Journal of Materials Research , Volume 10 , Issue 8 , August 1995 , pp. 1933 - 1941
Copyright
Copyright © Materials Research Society 1995

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