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Twinning-like lattice reorientation without a crystallographic twinning plane.
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Nat Commun  2014, 5, 3297 DOI: 10.1038/ncomms4297
Liu, Bo-Yu 1 ; Wang, Jian 2 ; Li, Bin 3 ; Lu, Lu 4 ; Zhang, Xi-Yan 5 ; Shan, Zhi-Wei 1 ; Li, Ju 6 ; Jia, Chun-Lin 4 ; Sun, Jun 1 ; Ma, Evan 7

1.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, Xi'an 710049, China.

2.MST-8, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.

3.Center for Advanced Vehicular Systems, Mississippi State University, Starkville, Mississippi 39762, USA.

4.International Center of Dielectric Research, Xi'an Jiaotong University, Xi'an 710049, China.

5.School of Materials Science and Engineering, Chongqing University, Chongqing 400044, China.

6.1] 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, Xi'an 710049, China [2] Department of Nuclear Science and Engineering and Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.

7.1] 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, Xi'an 710049, China [2] Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, Maryland 21218, USA.


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.
 
 
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