New twinning route in face-centered cubic nanocrystalline metals

Lihua Wang, Pengfei Guan, Jiao Teng, Pan Liu, Dengke Chen, Weiyu Xie, Deli Kong, Shengbai Zhang, Ting Zhu (), Ze Zhang, Evan Ma, Mingwei Chen () and Xiaodong Han ()
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Lihua Wang: Beijing University of Technology
Pengfei Guan: Beijing Computational Science Research Center
Jiao Teng: University of Science and Technology Beijing
Pan Liu: Tohoku University
Dengke Chen: Georgia Institute of Technology
Weiyu Xie: Rensselaer Polytechnic Institute, Troy
Deli Kong: Beijing University of Technology
Shengbai Zhang: Rensselaer Polytechnic Institute, Troy
Ting Zhu: Georgia Institute of Technology
Ze Zhang: Beijing University of Technology
Evan Ma: Johns Hopkins University
Mingwei Chen: Tohoku University
Xiaodong Han: Beijing University of Technology

Nature Communications, 2017, vol. 8, issue 1, 1-7

Abstract: Abstract Twin nucleation in a face-centered cubic crystal is believed to be accomplished through the formation of twinning partial dislocations on consecutive atomic planes. Twinning should thus be highly unfavorable in face-centered cubic metals with high twin-fault energy barriers, such as Al, Ni, and Pt, but instead is often observed. Here, we report an in situ atomic-scale observation of twin nucleation in nanocrystalline Pt. Unlike the classical twinning route, deformation twinning initiated through the formation of two stacking faults separated by a single atomic layer, and proceeded with the emission of a partial dislocation in between these two stacking faults. Through this route, a three-layer twin was nucleated without a mandatory layer-by-layer twinning process. This route is facilitated by grain boundaries, abundant in nanocrystalline metals, that promote the nucleation of separated but closely spaced partial dislocations, thus enabling an effective bypassing of the high twin-fault energy barrier.

Date: 2017
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DOI: 10.1038/s41467-017-02393-4

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