Tensile instability in face-centred cubic materials

被引：28

作者：

Basinski, ZS ^{[1
]}

Szczerba, MS ^{[1
]}

Embury, JD ^{[1
]}

机构：

[1] STANISLAW STASZIC UNIV MIN & MET,DEPT STRUCT & MECH SOLIDS,PL-30059 KRAKOW,POLAND

来源：

PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES | 1997年 / 76卷 / 04期

基金：

加拿大自然科学与工程研究理事会;

关键词：

D O I：

10.1080/01418619708214207

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A study of plastic instability in tension, which occurs well before the Considere criterion is met, is reported for face-centred cubic single crystals. The observations show that the instability is caused by a sudden effective decrease in work hardening resulting from the operation of a new dominant shear system. The change of dominant shear system is always accompanied by strain localization phenomena. In general, the rate of work hardening at the point of strain localization is appreciably higher than the flow stress. It is concluded that strain localization is a consequence of change of the deformation mechanism rather than a gradual decrease in the rate of work hardening. The dependence of this type of instability on crystal orientation, chemical composition and deformation temperature is discussed Premature strain localization was also observed in polycrystalline specimens at high stresses; this phenomenon is also discussed.

引用

页码：743 / 752

页数：10