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Theory of anisotropic growth rates in the ordering of an fcc alloy

Theory of anisotropic growth rates in the ordering of an fcc alloy
Theory of anisotropic growth rates in the ordering of an fcc alloy
A multiple-order-parameter theory of ordering on a binary face-centred-cubic (f.c.c.) crystal lattice is used to model diffuse interphase boundaries and provide expressions for the anisotropy of the kinetic coefficient that characterizes the speed of the order-disorder boundary. The anisotropy is varied parametrically with the ratio of two gradient energy coefficients. In contrast to the results from single-order-parameter theories, the orientation dependence of the kinetic coefficient differs significantly from that of the surface energy. Although the interfacial free energy anisotropy from this model is not strong enough to eliminate any orientations in the (three-dimensional) equilibrium shapes, the kinetic coefficient is sufficiently anisotropic to eliminate some orientations during growth. The long-time kinetic growth shapes show the development of edges and corners in a definite sequence as the anisotropy increases.
1359-6454
1-12
Braun, R.J.
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Cahn, J.W.
4fe7231c-d9a1-4656-858c-2de87853b7c4
Fadden, G.B.
eef81e88-e7ce-4ccb-b767-cf5b1060dcf9
Rushmeier, H.E.
7053c7a1-c00a-4c4d-91a3-33b8d464c897
Wheeler, A.A.
eb831100-6e51-4674-878a-a2936ad04d73
Braun, R.J.
a00ab669-1856-4b10-b2c8-d41b9d632f78
Cahn, J.W.
4fe7231c-d9a1-4656-858c-2de87853b7c4
Fadden, G.B.
eef81e88-e7ce-4ccb-b767-cf5b1060dcf9
Rushmeier, H.E.
7053c7a1-c00a-4c4d-91a3-33b8d464c897
Wheeler, A.A.
eb831100-6e51-4674-878a-a2936ad04d73

Braun, R.J., Cahn, J.W., Fadden, G.B., Rushmeier, H.E. and Wheeler, A.A. (1998) Theory of anisotropic growth rates in the ordering of an fcc alloy. Acta Materialia, 46 (1), 1-12. (doi:10.1016/S1359-6454(97)00236-X).

Record type: Article

Abstract

A multiple-order-parameter theory of ordering on a binary face-centred-cubic (f.c.c.) crystal lattice is used to model diffuse interphase boundaries and provide expressions for the anisotropy of the kinetic coefficient that characterizes the speed of the order-disorder boundary. The anisotropy is varied parametrically with the ratio of two gradient energy coefficients. In contrast to the results from single-order-parameter theories, the orientation dependence of the kinetic coefficient differs significantly from that of the surface energy. Although the interfacial free energy anisotropy from this model is not strong enough to eliminate any orientations in the (three-dimensional) equilibrium shapes, the kinetic coefficient is sufficiently anisotropic to eliminate some orientations during growth. The long-time kinetic growth shapes show the development of edges and corners in a definite sequence as the anisotropy increases.

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Published date: 1998

Identifiers

Local EPrints ID: 29097
URI: http://eprints.soton.ac.uk/id/eprint/29097
ISSN: 1359-6454
PURE UUID: 80b66397-c027-4020-a422-88987fc1864a

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Date deposited: 09 Jan 2007
Last modified: 08 Jan 2022 01:04

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Contributors

Author: R.J. Braun
Author: J.W. Cahn
Author: G.B. Fadden
Author: H.E. Rushmeier
Author: A.A. Wheeler

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