Document Type

Article

Publication Date

2014

Journal or Book Title

Physical Review B

Volume

89

First Page

094107-1

Last Page

094107-5

DOI

10.1103/PhysRevB.89.094107

Abstract

The definition of all properties of the nonequilibrium interface depends on the choice of the position of the dividing surface. However, the definition of its position has been an unsolved problem for more than a century. A missing principle to unambiguously determine the position of the Gibbs’ dividing surface is found: the principle of static equivalence. A sharp interface (dividing surface) is statically equivalent to a nonequilibrium finite-width interface with distributed tensile stresses if it possesses (a) the same resultant force, equal to the interface energy, and (b) the same moment, which is zero about the interface position. Each of these conditions determines the position of a sharp interface, which may be contradictory. This principle is applied to resolve another basic problem: the development of a phase field approach to an interface motion that includes an expression for interface stresses, which are thermodynamically consistent, and consistent with a sharp-interface limit. Using an analytical solution for a curved propagating interface, it is shown that both conditions determine the same dividing surface, i.e., the theory is self-consistent. The expression for the interface energy is also consistent with the expression for the velocity of the curved sharp interface. Applications to more complex interfaces that support elastic stresses are discussed.

Comments

This article is from Physical Review B89 (2014): 094107, doi: 10.1103/PhysRevB.89.094107. Posted with permission

Copyright Owner

American Physical Society

Language

en

Date Available

2014-06-05

File Format

application/pdf

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