HVEM OBSERVATION OF DISLOCATION-FREE ZONES AT CRACK TIPS IN IRON SINGLE-CRYSTALS

被引：22

作者：

OHR, SM ^{[1
]}

SAKA, H ^{[1
]}

ZHU, Y ^{[1
]}

IMURA, T ^{[1
]}

机构：

[1] NAGOYA UNIV,DEPT MET,NAGOYA,AICHI 464,JAPAN

来源：

PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES | 1988年 / 57卷 / 04期

关键词：

CRYSTALS - Dislocations - IRON AND ALLOYS - Deformation - MATERIALS - Crack Propagation - MICROSCOPES; ELECTRON; -; Applications;

D O I：

10.1080/01418618808214417

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The distribution of dislocations in the vicinity of a crack tip has been studied in single crystals of iron during in situ tensile deformation in a high-voltage electron microscope. The results show that a large number of dislocations are emitted from the crack tip during crack propagation in thick specimens. The emitted dislocations immediately move away from the crack tip, creating a dislocation-free zone (DFZ) near the crack tip. The dislocations come to rest in a plastic zone located some distance from the crack tip and form dense tangles. These observations are discussed in terms of the model of elastic interaction between a crack and dislocations.

引用

页码：677 / 684

页数：8

共 22 条

[1] SPREAD OF PLASTIC YIELD FROM A NOTCH [J].