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Twinning-like lattice reorientation without a crystallographic twinning plane

Author(s)
Liu, Bo-Yu; Wang, Jian; Li, Bin; Lu, Lu; Zhang, Xi-Yan; Shan, Zhi-Wei; Li, Ju; Jia, Chun-Lin; Sun, Jun; Ma, Evan; ... Show more Show less
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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.
Date issued
2014-02
URI
http://hdl.handle.net/1721.1/95881
Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering; Massachusetts Institute of Technology. Department of Nuclear Science and Engineering
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
ISSN
2041-1723

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