Dislocation Multiplication from the Frank-Read Source in Atomic Models

被引：25

作者：

Shimokawa, Tomotsugu ^{[1
]}

Kitada, Soya ^{[2
]}

机构：

[1] Kanazawa Univ, Coll Sci & Engn, Sch Mech Engn, Kanazawa, Ishikawa 9201192, Japan

[2] Kanazawa Univ, Grad Sch Nat Sci Technol, Div Mech Sci & Engn, Kanazawa, Ishikawa 9201192, Japan

来源：

MATERIALS TRANSACTIONS | 2014年 / 55卷 / 01期

基金：

日本科学技术振兴机构; 日本学术振兴会;

关键词：

dislocation multiplication; Frank-Read source; dislocation bow-out; dislocation source; atomic simulation; mechanical property; MOLECULAR-DYNAMICS; STRESS; METALS; NANOCRYSTALLINE; POTENTIALS; VOIDS;

D O I：

10.2320/matertrans.MA201319

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Dislocation multiplication from the Frank Read source is investigated in aluminum by applying atomic models. To express the dislocation bow-out motion and dislocation loop formation, we introduce cylindrical holes as a strong pinning point to the dislocation-bowing segment. The critical configuration for dislocation bow-out in atomic models exhibits an oval shape, which agrees well with the results obtained by the line tension model. The critical shear stress for the dislocation bow-out in atomic models continuously increases with decreasing length L of the Frank Read source (even at the nanometer scale). This is expressed by the function L-1 lnL, which is obtained by a continuum model based on elasticity theory. The critical shear stresses for the Frank Read source are compared with those for grain boundary dislocation sources, as well as the ideal shear strength.

引用

页码：58 / 63

页数：6