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Title: Reversal in the Size Dependence of Grain Rotation

Abstract

The conventional belief, based on the Read-Shockley model for the grain rotation mechanism, has been that smaller grains rotate more under stress due to the motion of grain boundary dislocations. However, in our high-pressure synchrotron Laue x-ray microdiffraction experiments, 70 nm nickel particles are found to rotate more than any other grain size. We infer that the reversal in the size dependence of the grain rotation arises from the crossover between the grain boundary dislocation-mediated and grain interior dislocation-mediated deformation mechanisms. The dislocation activities in the grain interiors are evidenced by the deformation texture of nickel nanocrystals. This new finding reshapes our view on the mechanism of grain rotation and helps us to better understand the plastic deformation of nanomaterials, particularly of the competing effects of grain boundary and grain interior dislocations.

Authors:
 [1];  [2];  [3];  [4];  [2];  [3];  [3];  [3];  [3];  [3]
  1. Center for High Pressure Science and Technology Advanced Research, Shanghai (China); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source
  3. Center for High Pressure Science and Technology Advanced Research, Shanghai (China)
  4. Univ.of California, Los Angeles, CA (United States). Dept. of Chemistry and Biochemistry
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1379748
Alternate Identifier(s):
OSTI ID: 1345444
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 118; Journal Issue: 9; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Zhou, Xiaoling, Tamura, Nobumichi, Mi, Zhongying, Lei, Jialin, Yan, Jinyuan, Zhang, Lingkong, Deng, Wen, Ke, Feng, Yue, Binbin, and Chen, Bin. Reversal in the Size Dependence of Grain Rotation. United States: N. p., 2017. Web. doi:10.1103/PhysRevLett.118.096101.
Zhou, Xiaoling, Tamura, Nobumichi, Mi, Zhongying, Lei, Jialin, Yan, Jinyuan, Zhang, Lingkong, Deng, Wen, Ke, Feng, Yue, Binbin, & Chen, Bin. Reversal in the Size Dependence of Grain Rotation. United States. https://doi.org/10.1103/PhysRevLett.118.096101
Zhou, Xiaoling, Tamura, Nobumichi, Mi, Zhongying, Lei, Jialin, Yan, Jinyuan, Zhang, Lingkong, Deng, Wen, Ke, Feng, Yue, Binbin, and Chen, Bin. Wed . "Reversal in the Size Dependence of Grain Rotation". United States. https://doi.org/10.1103/PhysRevLett.118.096101. https://www.osti.gov/servlets/purl/1379748.
@article{osti_1379748,
title = {Reversal in the Size Dependence of Grain Rotation},
author = {Zhou, Xiaoling and Tamura, Nobumichi and Mi, Zhongying and Lei, Jialin and Yan, Jinyuan and Zhang, Lingkong and Deng, Wen and Ke, Feng and Yue, Binbin and Chen, Bin},
abstractNote = {The conventional belief, based on the Read-Shockley model for the grain rotation mechanism, has been that smaller grains rotate more under stress due to the motion of grain boundary dislocations. However, in our high-pressure synchrotron Laue x-ray microdiffraction experiments, 70 nm nickel particles are found to rotate more than any other grain size. We infer that the reversal in the size dependence of the grain rotation arises from the crossover between the grain boundary dislocation-mediated and grain interior dislocation-mediated deformation mechanisms. The dislocation activities in the grain interiors are evidenced by the deformation texture of nickel nanocrystals. This new finding reshapes our view on the mechanism of grain rotation and helps us to better understand the plastic deformation of nanomaterials, particularly of the competing effects of grain boundary and grain interior dislocations.},
doi = {10.1103/PhysRevLett.118.096101},
journal = {Physical Review Letters},
number = 9,
volume = 118,
place = {United States},
year = {Wed Mar 01 00:00:00 EST 2017},
month = {Wed Mar 01 00:00:00 EST 2017}
}

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Grain Rotation in Plastic Deformation
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