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Computer simulation of grain growth kinetics with solute drag

Published online by Cambridge University Press:  31 January 2011

D. Fan ,
S. P. Chen  and
Long-Qing Chen
D. Fan
Affiliation:
P.O. Box 5800, MS 1411, Sandia National Laboratories, Albuquerque, New Mexico 87185
S. P. Chen
Affiliation:
Theoretical Division, MS B262, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
Long-Qing Chen
Affiliation:
Department of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania 16862
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Abstract

The effects of solute drag on grain growth kinetics were studied in two-dimensional (2D) computer simulations by using a diffuse-interface field model. It is shown that, in the low velocity/low driving force regime, the velocity of a grain boundary motion departs from a linear relation with driving force (curvature) with solute drag. The nonlinear relation of migration velocity and driving force comes from the dependence of grain boundary energy and width on the curvature. The growth exponent m of power growth law for a polycrystalline system is affected by the segregation of solutes to grain boundaries. With the solute drag, the growth exponent m can take any value between 2 and 3, depending on the ratio of lattice diffusion to grain boundary mobility. The grain size and topological distributions are unaffected by solute drag, which are the same as those in a pure system.

Type
Articles
Information
Journal of Materials Research , Volume 14 , Issue 3 , March 1999 , pp. 1113 - 1123
Copyright
Copyright © Materials Research Society 1999

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