Twinning-like lattice reorientation without a crystallographic twinning plane

Bo-Yu Liu, Jian Wang, Bin Li, Lu Lu, Xi-Yan Zhang, Zhi-Wei Shan (), Ju Li, Chun-Lin Jia, Jun Sun and Evan Ma
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Bo-Yu Liu: Center for Advancing Materials Performance from the Nanoscale (CAMP-Nano) and Hysitron Applied Research Center in China (HARCC), State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University
Jian Wang: MST-8, Los Alamos National Laboratory
Bin Li: Center for Advanced Vehicular Systems, Mississippi State University
Lu Lu: International Center of Dielectric Research, Xi'an Jiaotong University
Xi-Yan Zhang: School of Materials Science and Engineering, Chongqing University
Zhi-Wei Shan: Center for Advancing Materials Performance from the Nanoscale (CAMP-Nano) and Hysitron Applied Research Center in China (HARCC), State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University
Ju Li: Center for Advancing Materials Performance from the Nanoscale (CAMP-Nano) and Hysitron Applied Research Center in China (HARCC), State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University
Chun-Lin Jia: International Center of Dielectric Research, Xi'an Jiaotong University
Jun Sun: Center for Advancing Materials Performance from the Nanoscale (CAMP-Nano) and Hysitron Applied Research Center in China (HARCC), State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University
Evan Ma: Center for Advancing Materials Performance from the Nanoscale (CAMP-Nano) and Hysitron Applied Research Center in China (HARCC), State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University

Nature Communications, 2014, vol. 5, issue 1, 1-6

Abstract: Abstract Twinning on the 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 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 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: 2014
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DOI: 10.1038/ncomms4297

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