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Title: Sliding of coherent twin boundaries

Abstract

Coherent twin boundaries (CTBs) are internal interfaces that can play a key role in markedly enhancing the strength of metallic materials while preserving their ductility. They are known to accommodate plastic deformation primarily through their migration, while experimental evidence documenting large-scale sliding of CTBs to facilitate deformation has thus far not been reported. We show here that CTB sliding is possible whenever the loading orientation enables the Schmid factors of leading and trailing partial dislocations to be comparable to each other. This theoretical prediction is confirmed by real-time transmission electron microscope experimental observations during uniaxial deformation of copper pillars with different orientations and is further validated at the atomic scale by recourse to molecular dynamics simulations. Our findings provide mechanistic insights into the evolution of plasticity in heavily twinned face-centered cubic metals, with the potential for optimizing mechanical properties with nanoscale CTBs in material design.

Authors:
 [1];  [2];  [1];  [1];  [3];  [4]; ORCiD logo [4];  [5];  [6];  [1]
  1. Xi’an Jiaotong University (China)
  2. Johns Hopkins Univ., Baltimore, MD (United States)
  3. Chinese Academy of Sciences, Shenyang (China)
  4. Xi’an Jiaotong University (China); Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  5. Xi’an Jiaotong University (China); Johns Hopkins Univ., Baltimore, MD (United States)
  6. Nanyang Technological University (Singapore)
Publication Date:
Research Org.:
Johns Hopkins Univ., Baltimore, MD (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
OSTI Identifier:
1499935
Grant/Contract Number:  
FG02-03ER46056
Resource Type:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 8; Journal Issue: 1; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Wang, Zhang-Jie, Li, Qing-Jie, Li, Yao, Huang, Long-Chao, Lu, Lei, Dao, Ming, Li, Ju, Ma, Evan, Suresh, Subra, and Shan, Zhi-Wei. Sliding of coherent twin boundaries. United States: N. p., 2017. Web. doi:10.1038/s41467-017-01234-8.
Wang, Zhang-Jie, Li, Qing-Jie, Li, Yao, Huang, Long-Chao, Lu, Lei, Dao, Ming, Li, Ju, Ma, Evan, Suresh, Subra, & Shan, Zhi-Wei. Sliding of coherent twin boundaries. United States. doi:10.1038/s41467-017-01234-8.
Wang, Zhang-Jie, Li, Qing-Jie, Li, Yao, Huang, Long-Chao, Lu, Lei, Dao, Ming, Li, Ju, Ma, Evan, Suresh, Subra, and Shan, Zhi-Wei. Tue . "Sliding of coherent twin boundaries". United States. doi:10.1038/s41467-017-01234-8. https://www.osti.gov/servlets/purl/1499935.
@article{osti_1499935,
title = {Sliding of coherent twin boundaries},
author = {Wang, Zhang-Jie and Li, Qing-Jie and Li, Yao and Huang, Long-Chao and Lu, Lei and Dao, Ming and Li, Ju and Ma, Evan and Suresh, Subra and Shan, Zhi-Wei},
abstractNote = {Coherent twin boundaries (CTBs) are internal interfaces that can play a key role in markedly enhancing the strength of metallic materials while preserving their ductility. They are known to accommodate plastic deformation primarily through their migration, while experimental evidence documenting large-scale sliding of CTBs to facilitate deformation has thus far not been reported. We show here that CTB sliding is possible whenever the loading orientation enables the Schmid factors of leading and trailing partial dislocations to be comparable to each other. This theoretical prediction is confirmed by real-time transmission electron microscope experimental observations during uniaxial deformation of copper pillars with different orientations and is further validated at the atomic scale by recourse to molecular dynamics simulations. Our findings provide mechanistic insights into the evolution of plasticity in heavily twinned face-centered cubic metals, with the potential for optimizing mechanical properties with nanoscale CTBs in material design.},
doi = {10.1038/s41467-017-01234-8},
journal = {Nature Communications},
number = 1,
volume = 8,
place = {United States},
year = {2017},
month = {10}
}

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Cited by: 9 works
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Figures / Tables:

Fig. 1 Fig. 1: Coherent twin boundary sliding vs. coherent twin boundary migration. a Schematic illustration showing double Thompson tetrahedra (tetrahedron of matrix and twin) in a Cu pillar containing (111) twin planes. Color contours showing calculated values of Schmid factor of the b leading partial dislocation and c trailing partial dislocationmore » for all the loading orientations in the [100] – [111] – [111¯] stereographic triangle. d The standard triangle of the stereographic projection showing different regimes for coherent twin boundary sliding (CTBS) and coherent twin boundary migration (CTBM)« less

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    Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.