Depinning transition of dislocation assemblies: Pileups and low-angle grain boundaries

被引:68
作者
Moretti, P
Miguel, MC
Zaiser, M
Zapperi, S
机构
[1] Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy
[2] Univ Edinburgh, Ctr Mat Sci & Engn, Edinburgh EH9 3JL, Midlothian, Scotland
[3] Univ Barcelona, Fac Fis, Dept Fis Fonamental, E-08028 Barcelona, Spain
[4] Univ Edinburgh, Ctr Mat Sci & Engn, Edinburgh EH9 3JL, Midlothian, Scotland
[5] Univ Roma La Sapienza, INFM, UdR Roma 1, I-00185 Rome, Italy
[6] Univ Roma La Sapienza, SMC, Dipartimento Fis, I-00185 Rome, Italy
来源
PHYSICAL REVIEW B | 2004年 / 69卷 / 21期
关键词
D O I
10.1103/PhysRevB.69.214103
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We investigate the depinning transition occurring in dislocation assemblies. In particular, we consider the cases of regularly spaced pileups and low-angle grain boundaries interacting with a disordered stress landscape provided by solute atoms, or by other immobile dislocations present in nonactive slip systems. Using linear elasticity, we compute the stress originated by small deformations of these assemblies and the corresponding energy cost in two and three dimensions. Contrary to the case of isolated dislocation lines, which are usually approximated as elastic strings with an effective line tension, the deformations of a dislocation assembly cannot be described by local elastic interactions with a constant tension or stiffness. A nonlocal elastic kernel results as a consequence of long-range interactions between dislocations. In light of this result, we revise statistical depinning theories of dislocation assemblies and compare the theoretical results with numerical simulations and experimental data.
引用
收藏
页码:214103 / 1
页数:11
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