Unknown

Dataset Information

0

Cross-Split of Dislocations: An Athermal and Rapid Plasticity Mechanism.


ABSTRACT: The pathways by which dislocations, line defects within the lattice structure, overcome microstructural obstacles represent a key aspect in understanding the main mechanisms that control mechanical properties of ductile crystalline materials. While edge dislocations were believed to change their glide plane only by a slow, non-conservative, thermally activated motion, we suggest the existence of a rapid conservative athermal mechanism, by which the arrested edge dislocations split into two other edge dislocations that glide on two different crystallographic planes. This discovered mechanism, for which we coined a term "cross-split of edge dislocations", is a unique and collective phenomenon, which is triggered by an interaction with another same-sign pre-existing edge dislocation. This mechanism is demonstrated for faceted ?-Fe nanoparticles under compression, in which we propose that cross-split of arrested edge dislocations is resulting in a strain burst. The cross-split mechanism provides an efficient pathway for edge dislocations to overcome planar obstacles.

SUBMITTER: Kositski R 

PROVIDER: S-EPMC4869067 | biostudies-literature | 2016 May

REPOSITORIES: biostudies-literature

altmetric image

Publications

Cross-Split of Dislocations: An Athermal and Rapid Plasticity Mechanism.

Kositski Roman R   Kovalenko Oleg O   Lee Seok-Woo SW   Greer Julia R JR   Rabkin Eugen E   Mordehai Dan D  

Scientific reports 20160517


The pathways by which dislocations, line defects within the lattice structure, overcome microstructural obstacles represent a key aspect in understanding the main mechanisms that control mechanical properties of ductile crystalline materials. While edge dislocations were believed to change their glide plane only by a slow, non-conservative, thermally activated motion, we suggest the existence of a rapid conservative athermal mechanism, by which the arrested edge dislocations split into two other  ...[more]

Similar Datasets

| S-EPMC6689057 | biostudies-literature
| S-EPMC8346628 | biostudies-literature
| S-EPMC6597557 | biostudies-literature
| S-EPMC3808530 | biostudies-literature
| S-EPMC3865799 | biostudies-literature
| S-EPMC7232844 | biostudies-literature
| S-EPMC10652396 | biostudies-literature
| S-EPMC6694131 | biostudies-literature
| S-EPMC2749324 | biostudies-literature
| S-EPMC7566635 | biostudies-literature