Twinning-like lattice reorientation without a crystallographic twinning plane
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Li_Twinning-like.pdf
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3.03 MB
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Author(s)
Liu, Bo-Yu
Wang, Jian
Li, Bin
Lu, Lu
Zhang, Xi-Yan
Shan, Zhi-Wei
Li, Ju
Jia, Chun-Lin
Ma, Evan
Sun, Jun, 1975-
Date Issued
February 2014
Journal
Nature Communications
Publisher
Nature Publishing Group
Citation
Liu, Bo-Yu, Jian Wang, Bin Li, Lu Lu, Xi-Yan Zhang, Zhi-Wei Shan, Ju Li, Chun-Lin Jia, Jun Sun, and Evan Ma. “Twinning-Like Lattice Reorientation Without a Crystallographic Twinning Plane.” Nature Communications 5 (February 13, 2014).
Version
Final published version
Abstract
Twinning on the {10[bar over 1]2} plane is a common mode of plastic deformation for hexagonal-close-packed metals. Here we report, by monitoring the deformation of submicron-sized single-crystal magnesium compressed normal to its prismatic plane with transmission electron microscopy, the reorientation of the parent lattice to a ‘twin’ lattice, producing an orientational relationship akin to that of the conventional {10[bar over 1]2} twinning, but without a crystallographic mirror plane, and giving plastic strain that is not simple shear. Aberration-corrected transmission electron microscopy observations reveal that the boundary between the parent lattice and the ‘twin’ lattice is composed predominantly of semicoherent basal/prismatic interfaces instead of the {10[bar over 1]2} twinning plane. The migration of this boundary is dominated by the movement of these interfaces undergoing basal/prismatic transformation via local rearrangements of atoms. This newly discovered deformation mode by boundary motion mimics conventional deformation twinning but is distinct from the latter and, as such, broadens the known mechanisms of plasticity.
MIT Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering
Massachusetts Institute of Technology. Department of Nuclear Science and Engineering
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Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License
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DOI of Published Version
https://doi.org/10.1038/ncomms4297
