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Dynamic recrystallization initiated by direct grain reorientation at high-angle grain boundary in α-titanium

Published online by Cambridge University Press:  15 May 2019

Hao Wang ,
Qili L. Bao ,
Gang Zhou ,
J.K. Qiu ,
Yi Yang ,
Y.J. Ma ,
Chunguang G. Bai ,
Dongsheng S. Xu ,
David Rugg  and
Aijun J. Huang
...Show all authors
Hao Wang*
Affiliation:
Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, People’s Republic of China; and School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, People’s Republic of China
Qili L. Bao
Affiliation:
Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, People’s Republic of China; and School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, People’s Republic of China
Gang Zhou
Affiliation:
Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, People’s Republic of China; and School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, People’s Republic of China
J.K. Qiu
Affiliation:
Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, People’s Republic of China; and School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, People’s Republic of China
Yi Yang
Affiliation:
University of Shanghai for Science and Technology, Shanghai 200093, People’s Republic of China
Y.J. Ma
Affiliation:
Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, People’s Republic of China; and School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, People’s Republic of China
Chunguang G. Bai
Affiliation:
Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, People’s Republic of China; and School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, People’s Republic of China
Dongsheng S. Xu
Affiliation:
Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, People’s Republic of China; and School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, People’s Republic of China
David Rugg
Affiliation:
Rolls-Royce PLC, Derby DE24 8BJ, U.K.
Aijun J. Huang
Affiliation:
University of Shanghai for Science and Technology, Shanghai 200093, People’s Republic of China
Qing-Miao Hu
Affiliation:
Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, People’s Republic of China; and School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, People’s Republic of China
J.F. Lei
Affiliation:
Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, People’s Republic of China; and School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, People’s Republic of China
Rui Yang
Affiliation:
Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, People’s Republic of China; and School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, People’s Republic of China
*
a)Address all correspondence to this author. e-mail: haowang@imr.ac.cn
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Abstract

Employing atomic-scale simulations, the response of a high-angle grain boundary (GB), the soft/hard GB, against external loading was systematically investigated. Under tensile loading close to the hard orientation, strain-induced dynamic recrystallization was observed to initiate through direct soft-to-hard grain reorientation, which was triggered by stress mismatch, inhibited by surface tension from the soft-hard GB, and proceeded by interface ledges. Such grain reorientation corresponds with expansion and contraction of the hard grain along and perpendicular to the loading direction, respectively, accompanied by local atomic shuffling, providing relatively large normal strain of 8.3% with activation energy of 0.04 eV per atom. Tensile strain and residual dislocations on the hard/soft GB facilitate the initiation of dynamic recrystallization by lowering the energy barrier and the critical stress for grain reorientation, respectively.

Keywords

plastic deformationgrain boundaryrecrystallizationreorientationatomistic simulation

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