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Interface Mobility Under Different Driving Forces

Published online by Cambridge University Press:  31 January 2011

M. I. Mendelev ,
D. J. Srolovitz ,
L. S. Shvindlerman  and
G. Gottstein
M. I. Mendelev
Affiliation:
Princeton Materials Institute & Department of Mechanical & Aerospace Engineering, Princeton University, Princeton, New Jersey 08544
D. J. Srolovitz*
Affiliation:
Princeton Materials Institute & Department of Mechanical & Aerospace Engineering, Princeton University, Princeton, New Jersey 08544
L. S. Shvindlerman
Affiliation:
Institut fuÄr Metallkunde und Metallphysik, RWTH Aachen, D-52056 Aachen, Germany
G. Gottstein
Affiliation:
Institut fuÄr Metallkunde und Metallphysik, RWTH Aachen, D-52056 Aachen, Germany
*
a)Address all correspondence to this author. e-mail: srol@princeton.edu
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Abstract

We used an Ising model to determine whether boundary mobility is an intrinsic material parameter or if it depends on the nature of the driving force for boundary migration. The simulations included both capillarity and external field-driven boundary migration. The external field-driven, flat boundary simulations showed that boundary mobility depends strongly on boundary inclination at low temperature but not at high temperature. On the other hand, the boundary mobility in capillarity-driven migration shows no dependence on boundary inclination and is independent of the boundary migration geometry. An initially circular grain shrinks as a circle and a half-loop boundary retracts with profiles predicted under the assumption that the boundary mobility is isotropic during capillarity-driven migration even when the temperature is very low and the external-field-driven boundary migration is extremely anisotropic. However, when an external field is superimposed on the capillarity driven migration of the circular boundary, the circular grain exhibits well-defined corners consistent with the simulation lattice symmetry. In this case, the boundary mobility is much different than if the external field were omitted. This is a clear demonstration that the boundary mobility can depend on the nature of the driving force for boundary migration.

Type
Articles
Information
Journal of Materials Research , Volume 17 , Issue 1 , January 2002 , pp. 234 - 245
Copyright
Copyright © Materials Research Society 2002

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