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摘要:
A detailed in situ investigation of dislocation processes has been rare for nanograined materials with grain sized near or less than 10 nm. Here, we report a time-resolved and atomic-scale in situ transmission electron microscopy observation of the nucleation, motion, annihilation, and storage of full dislocations in nanograins with diameters less than similar to 10 nm. Annihilation of dislocation dipoles appears to be a major contributor to the reduction in dislocation density, in addition to annihilation at grain boundary sinks. The accumulation of a high density of dislocations inside nanograins is found to be possible when they are surrounded by neighboring grains. (c) 2011 American Institute of Physics. [doi: 10.1063/1.3549866]
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来源 :
APPLIED PHYSICS LETTERS
ISSN: 0003-6951
年份: 2011
期: 5
卷: 98
4 . 0 0 0
JCR@2022
ESI学科: PHYSICS;
JCR分区:1
中科院分区:2