Structure and strength of dislocation junctions: An atomic level analysis

被引:134
作者
Rodney, D [1 ]
Phillips, R [1 ]
机构
[1] Brown Univ, Div Engn, Providence, RI 02912 USA
关键词
D O I
10.1103/PhysRevLett.82.1704
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
The quasicontinuum method is used to simulate three-dimensional Lomer-Cottrell junctions both in the absence and in the presence of an applied stress. The simulations show that this type of junction is destroyed by an unzipping mechanism in which the dislocations that form the junction are gradually pulled apart along the junction segment. The calculated critical stress needed for breaking the junction is comparable to that predicted by line tension models. The simulations also demonstrate a strong influence of the initial dislocation line directions on the breaking mechanism, an effect that is neglected in the macroscopic treatment of the hardening effect of junctions.
引用
收藏
页码:1704 / 1707
页数:4
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