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New twinning route in face-centered cubic nanocrystalline metals

Author:
Wang, Lihua  Guan, Pengfei  Teng, Jiao  Liu, Pan  Chen, Dengke  Xie, Weiyu  Kong, Deli  Zhang, Shengbai  Zhu, Ting  Zhang, Ze  Ma, Evan  Chen, Mingwei  Han, Xiaodong  


Journal:
NATURE COMMUNICATIONS


Issue Date:
2017


Abstract(summary):

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.


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