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

Jiang, Lin; Gong, Mingyu; Wang, Jian; Pan, Zhiliang; Wang, Xin; Zhang, Dalong; Wang, Y. Morris; Ciston, Jim; Minor, Andrew M.; Xu, Mingjie; Pan, Xiaoqing; Rupert, Timothy J.; Mahajan, Subhash; Lavernia, Enrique J.; Beyerlein, Irene J.; Schoenung, Julie M.

doi:10.1038/s41467-021-27591-z

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

Journal Article · Sun Jan 09 23:00:00 EST 2022 · Nature Communications

DOI:https://doi.org/10.1038/s41467-021-27591-z· OSTI ID:1894629

Jiang, Lin ^[1]; Gong, Mingyu ^[2]; Wang, Jian ^[3]; Pan, Zhiliang ^[4]; Wang, Xin ^[4]; Zhang, Dalong ^[4]; ^[5]; ^[6]; ^[6]; Xu, Mingjie ^[4]; Pan, Xiaoqing ^[4]; Rupert, Timothy J. ^[4]; Mahajan, Subhash ^[7]; ^[8]; ^[9]; ^[4]

Univ. of California, Irvine, CA (United States); Thermo Fisher Scientific, Hillsboro, OR (United States)
Shanghai Jiao Tong Univ. (China)
Univ. of Nebraska, Lincoln, NE (United States)
Univ. of California, Irvine, CA (United States)
Univ. of California, Los Angeles, CA (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Molecular Foundry
Univ. of California, Davis, CA (United States)
National Academy of Engineering, Irvine, CA (United States)
Univ. of California, Santa Barbara, CA (United States)

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.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). The Molecular Foundry (TMF); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: National Science Foundation (NSF); US Department of the Navy, Office of Naval Research (ONR); USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-05CH11231; AC52-07NA27344

OSTI ID:: 1894629

Journal Information:: Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 13; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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