Theoretical study of the thermodynamic properties of alpha-delta' interphase boundaries in Al-Li

被引：26

作者：

Asta, M

机构：

[1] Compl. Materials Science Division, Sandia National Laboratories, MS 9163, Livermore, CA 94551-0969

来源：

ACTA MATERIALIA | 1996年 / 44卷 / 10期

关键词：

D O I：

10.1016/S1359-6454(96)00030-4

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The thermodynamic properties of coherent interphase-boundary interfaces between alpha and delta' phases in the Al-Li alloy system have been studied using a theoretical approach based on the cluster variation method. Interfacial excess free energies have been calculated for interphase boundaries with {100} and {111} crystallographic orientations at several temperatures ranging between 100 and 209 degrees C. Additionally, the dependencies of the average composition and the order parameter upon distance within the compositionally diffuse interfacial regions have been computed. The calculated interphase energies range between 7 and 11 mJ/m(2). From an analysis of the calculated composition and order-parameter profiles, interface widths are predicted to be as large as 27 Angstrom.

引用

页码：4131 / 4136

页数：6

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