Hierarchical twinning governed by defective twin boundary in metallic materials

Dense networks of deformation twins endow metals and alloys with unprecedented mechanical properties. However, the formation mechanism of these hierarchical twin structures remains under debate, especially their relations with the imperfect nature of twin boundaries (TBs). Here, we investigate the intrinsic deformability of defective TBs in face-centered cubic metallic materials, where the inherent kinks on a set of primary TBs are demonstrated to facilitate the formation of secondary and hierarchical nanotwins. This defect-driven hierarchical twinning propensity is critically dependent on the kink height, which proves to be generally applicable in a variety of metals and alloys with low stacking fault energies. As a geometric extreme, a fivefold twin can be constructed via this self-activated hierarchical twinning mechanism. These findings differ from the conventional twinning mechanisms, enriching our understanding of twinning-mediated plasticity in metallic materials.

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Published: May 20, 2022
Vol/Issue: 8(20)

Authors

Q

Qi Zhu

Center of Electron Microscopy and State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, P. R. China.

Q

Qishan Huang

Center for X-Mechanics, Department of Engineering Mechanics, Zhejiang University, Hangzhou 310027, P. R. China.

Y

Yanzhong Tian

Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), School of Materials Science and Engineering, Northeastern University, Shenyang 110819, P. R. China.

S

Shuchun Zhao

Center of Electron Microscopy and State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, P. R. China.

Y

Yingbin Chen

Center of Electron Microscopy and State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, P. R. China.

G

Guang Cao

Center of Electron Microscopy and State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, P. R. China.

K

Kai Song

School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471023, P. R. China.

Y

Yifan Zhou

School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471023, P. R. China.

W

Wei Yang

Center for X-Mechanics, Department of Engineering Mechanics, Zhejiang University, Hangzhou 310027, P. R. China.

Z

Ze Zhang

Center of Electron Microscopy and State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, P. R. China.

X

Xianghai An

School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, Sydney, NSW 2006, Australia.

H

Haofei Zhou

Center for X-Mechanics, Department of Engineering Mechanics, Zhejiang University, Hangzhou 310027, P. R. China.

J

Jiangwei Wang

Center of Electron Microscopy and State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, P. R. China.; Wenzhou Key Laboratory of Novel Optoelectronic and Nano Materials, Institute of Wenzhou, Zhejiang University, Wenzhou 325006, P. R. China.

Cite This Article

Qi Zhu, Qishan Huang, Yanzhong Tian, et al. (2022). Hierarchical twinning governed by defective twin boundary in metallic materials. Science Advances, 8(20). https://doi.org/10.1126/sciadv.abn8299

Hierarchical twinning governed by defective twin boundary in metallic materials

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