Mobility of self-interstitials in fcc and bcc metals

被引：17

作者：

Osetsky, YN ^{[1
]}

Serra, A ^{[1
]}

Priego, V ^{[1
]}

Gao, F ^{[1
]}

Bacon, DJ ^{[1
]}

机构：

[1] Univ Liverpool, Dept Engn, Liverpool L69 3BX, Merseyside, England

来源：

DIFFUSION MECHANISMS IN CRYSTALLINE MATERIALS | 1998年 / 527卷

关键词：

D O I：

10.1557/PROC-527-49

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Diffusion of self-interstitial atoms (SIAs) has been studied in bcc-Fe and fcc-Cu using molecular dynamics and interatomic potentials of different types. The Fe potentials describe SIA. configurations of different stability. The temperature dependence of the SIA diffusion mechanisms is qualitatively similar for both potentials. At high temperature the diffusion is three-dimensional via the [110] dumbbell mechanism. The contribution of one-dimensional mechanism-via the [111] crowdion increases when temperature decreases. At low temperature (<300K) the diffusion mechanism depends on the stable configuration of the SIA. In fcc-Cu all the potentials reproduce the same stable configuration, namely the [100] dumbbell. The migration mechanism is mainly a three-dimensional random walk via this dumbbell with small contributions from the [110] crowdion at high temperature and a two-dimensional caging mechanism at low temperature.

引用

页码：49 / 58

页数：10