Coherency and loss of coherency in lamellar Ti-Al

被引：54

作者：

Hazzledine, PM ^{[1
]}

机构：

[1] USAF, Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA

[2] Universal Energy Syst Inc, Dayton, OH 45432 USA

来源：

INTERMETALLICS | 1998年 / 6卷 / 7-8期

关键词：

titanium aluminides; based on TiAl; elastic properties; yield stress; phase interfaces; mechanical properties; theory;

D O I：

10.1016/S0966-9795(98)00034-X

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A grain of fully lamellar Ti-Al is modeled as a periodic multilayer which may contain any number of layers, each with different lattice parameters, different (isotropic) elastic constants and different thicknesses. Formulae are given for the coherence (plane) stress and strain tensors in any layer. The gamma layers all have inplane shears and a biaxial tension whereas the alpha(2) layers have principally a biaxial compression. The coherence stresses expected in various forms of fully coherent Ti-Al are tabulated. Estimates are made of the lamellar thicknesses at which the material becomes semi- or partially- coherent and of the residual coherence stresses in these materials. (C) 1998 Published by Elsevier Science Limited. All rights reserved.

引用

页码：673 / 677

页数：5

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