First-principles study on the mobility of screw dislocations in bcc iron

被引：97

作者：

Itakura, M. ^{[1
]}

Kaburaki, H. ^{[2
]}

Yamaguchi, M. ^{[2
]}

机构：

[1] Japan Atom Energy Agcy, Ctr Computat Sci & E Syst, Kashiwa, Chiba 2778587, Japan

[2] Japan Atom Energy Agcy, Ctr Computat Sci & E Syst, Tokai, Ibaraki 3191184, Japan

来源：

ACTA MATERIALIA | 2012年 / 60卷 / 09期

关键词：

First-principles calculation; Dislocations; Peierls barrier; Plastic deformation; THERMALLY-ACTIVATED FLOW; CORE-STRUCTURE; SINGLE CRYSTALS; ALPHA-FE; METALS; MOLYBDENUM; POTENTIALS; TUNGSTEN; MOTION; GLIDE;

D O I：

10.1016/j.actamat.2012.03.033

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The fully two-dimensional Peierls barrier map of screw dislocations in body-centered cubic (bcc) iron has been calculated using the first-principles method to identify the migration path of a dislocation core. An efficient method to correct the effect of the finite size cell used in the first-principles method on the energy of a lattice defect was devised to determine the accurate barrier profile. We find that the migration path is close to a straight line that is confined in a {110} plane and the Peierls barrier profile is single humped. This result clarifies why the existing empirical potentials of bcc iron fail to predict the correct mobility path. A line tension model incorporating these first-principles calculation results is used to predict the kink activation energy to be 0.73 eV in agreement with experiment. (C) 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：3698 / 3710

页数：13

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