Visualization and validation of twin nucleation and early-stage growth in magnesium

Lin Jiang, Mingyu Gong, Jian Wang, Zhiliang Pan, Xin Wang, Dalong Zhang, Y. Morris Wang, Jim Ciston, Andrew M. Minor, Mingjie Xu, Xiaoqing Pan, Timothy J. Rupert, Subhash Mahajan, Enrique J. Lavernia, Irene J. Beyerlein and Julie M. Schoenung ()
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Lin Jiang: University of California
Mingyu Gong: Shanghai Jiao Tong University
Jian Wang: University of Nebraska-Lincoln
Zhiliang Pan: University of California
Xin Wang: University of California
Dalong Zhang: University of California
Y. Morris Wang: University of California, Los Angeles
Jim Ciston: Lawrence Berkeley National Laboratory
Andrew M. Minor: Lawrence Berkeley National Laboratory
Mingjie Xu: University of California
Xiaoqing Pan: University of California
Timothy J. Rupert: University of California
Subhash Mahajan: University of California
Enrique J. Lavernia: National Academy of Engineering
Irene J. Beyerlein: University of California
Julie M. Schoenung: University of California

Nature Communications, 2022, vol. 13, issue 1, 1-11

Abstract: Abstract The abrupt occurrence of twinning when Mg is deformed leads to a highly anisotropic response, making it too unreliable for structural use and too unpredictable for observation. Here, we describe an in-situ transmission electron microscopy experiment on Mg crystals with strategically designed geometries for visualization of a long-proposed but unverified twinning mechanism. Combining with atomistic simulations and topological analysis, we conclude that twin nucleation occurs through a pure-shuffle mechanism that requires prismatic-basal transformations. Also, we verified a crystal geometry dependent twin growth mechanism, that is the early-stage growth associated with instability of plasticity flow, which can be dominated either by slower movement of prismatic-basal boundary steps, or by faster glide-shuffle along the twinning plane. The fundamental understanding of twinning provides a pathway to understand deformation from a scientific standpoint and the microstructure design principles to engineer metals with enhanced behavior from a technological standpoint.

Date: 2022
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DOI: 10.1038/s41467-021-27591-z

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