Structural transition and migration of incoherent twin boundary in diamond

Ke Tong, Xiang Zhang, Zihe Li, Yanbin Wang, Kun Luo, Chenming Li, Tianye Jin, Yuqing Chang, Song Zhao, Yingju Wu, Yufei Gao, Baozhong Li, Guoying Gao, Zhisheng Zhao, Lin Wang, Anmin Nie, Dongli Yu, Zhongyuan Liu, Alexander V. Soldatov, Wentao Hu (), Bo Xu () and Yongjun Tian ()
Additional contact information
Ke Tong: Yanshan University
Xiang Zhang: Yanshan University
Zihe Li: Yanshan University
Yanbin Wang: The University of Chicago
Kun Luo: Yanshan University
Chenming Li: Yanshan University
Tianye Jin: Yanshan University
Yuqing Chang: Yanshan University
Song Zhao: Yanshan University
Yingju Wu: Yanshan University
Yufei Gao: Yanshan University
Baozhong Li: Yanshan University
Guoying Gao: Yanshan University
Zhisheng Zhao: Yanshan University
Lin Wang: Yanshan University
Anmin Nie: Yanshan University
Dongli Yu: Yanshan University
Zhongyuan Liu: Yanshan University
Alexander V. Soldatov: Yanshan University
Wentao Hu: Yanshan University
Bo Xu: Yanshan University
Yongjun Tian: Yanshan University

Nature, 2024, vol. 626, issue 7997, 79-85

Abstract: Abstract Grain boundaries (GBs), with their diversity in both structure and structural transitions, play an essential role in tailoring the properties of polycrystalline materials1–5. As a unique GB subset, {112} incoherent twin boundaries (ITBs) are ubiquitous in nanotwinned, face-centred cubic materials6–9. Although multiple ITB configurations and transitions have been reported7,10, their transition mechanisms and impacts on mechanical properties remain largely unexplored, especially in regard to covalent materials. Here we report atomic observations of six ITB configurations and structural transitions in diamond at room temperature, showing a dislocation-mediated mechanism different from metallic systems11,12. The dominant ITBs are asymmetric and less mobile, contributing strongly to continuous hardening in nanotwinned diamond13. The potential driving forces of ITB activities are discussed. Our findings shed new light on GB behaviour in diamond and covalent materials, pointing to a new strategy for development of high-performance, nanotwinned materials.

Date: 2024
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DOI: 10.1038/s41586-023-06908-6

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