Influence of the electronic structure on the ductile behavior of B2 CsCl-type AB intermetallics

被引：106

作者：

Gschneidner, K. A., Jr. ^{[1
,2
]}

Ji, Min ^{[1
]}

Wang, C. Z. ^{[1
]}

Ho, K. M. ^{[1
,3
]}

Russell, A. M. ^{[1
,2
]}

Mudryk, Ya. ^{[1
]}

Becker, A. T. ^{[1
,2
]}

Larson, J. L. ^{[1
]}

机构：

[1] Iowa State Univ, Ames Lab, US Dept Energy, Ames, IA 50011 USA

[2] Iowa State Univ, Dept Mat Sci & Engn, Ames, IA 50011 USA

[3] Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA

来源：

ACTA MATERIALIA | 2009年 / 57卷 / 19期

关键词：

Rare earth intermetallic compounds; CsCl-type structure; Ductility; Electronic structure; First-principle electron theory; MECHANICAL-PROPERTIES; YCU; YAG;

D O I：

10.1016/j.actamat.2009.08.012

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The study of the ductile B2, CsCl-type AB intermetallic compounds has been expanded over the past few years in order to determine the underlying principles that account for their ductility. Using a global semi-empirical alloy theory approach together with first-principles band theory, we show that absence of d-band electrons near the Fermi level accounts for the observed ductility in over 90% of the phases studied to date. This model has been used to predict the ductile/brittle behavior in several other selected AB compounds. Considering the crystal structures of the known intermetallics, it is concluded that the existence of these ductile AB B2 compounds is an isolated situation because the von Mises criterion for ductility is met in the B2 materials, but not in other crystal structures. (C) 2009 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：5876 / 5881

页数：6

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