A theory of diffusion in the ordered alloy .2. Percolation and tracer diffusion

被引：12

作者：

Belova, IV

Murch, GE

机构：

[1] Department of Mechanical Engineering, The University of Newcastle, NSW

来源：

PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES | 1996年 / 73卷 / 04期

基金：

澳大利亚研究理事会;

关键词：

D O I：

10.1080/01418619608243716

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In this study, a model of a long-range ordered alloy where the sublattices exist a priori is considered. The model is a natural extension to the ordered state of the well known random alloy model. The analysis developed in Belova and Murch (1996, Phil. Mag. A, 73, 117), which was an adaptation of the ordered model of Manning's formalism for the random alloy, is considered further with emphasis on the percolative behaviour. It is shown that the percolation threshold for the mobile component in the highly ordered alloy moves from a composition given by (1 - f(0)) where f(0) is the tracer correlation factor in the lattice of a pure component (the random alloy result) to a composition given by (1 - (f(0)/2)). Expressions for the average jump frequencies are also derived. These, in combination with the analysis of tracer correlation in Belova and Murch (1996), enable the tracer diffusion coefficients to be determined.

引用

页码：1223 / 1235

页数：13

共 15 条

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