Twinning-like lattice reorientation without a crystallographic twinning plane
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 l...
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Published in | Nature communications Vol. 5; no. 1; p. 3297 |
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Main Authors | , , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
London
Nature Publishing Group UK
13.02.2014
Nature Publishing Group Nature Pub. Group |
Subjects | |
Online Access | Get full text |
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Summary: | 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.
Deformation twinning and dislocations are known to govern the plastic behaviour of metals at room temperature. Here the authors demonstrate a new deformation mechanism in single-crystal magnesium characterized by twin-like crystal reorientation and special interfaces. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 973 Program of China AC52-06NA25396; FWP 06SCPE401; W-7405-ENG-36; DMR-1240933; DMR-1120901; 50925104; 11132006; 51231005; 51321003; 50890170; 51071183; 51271208; 2010CB631003; B06025 National Science Foundation (NSF) USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division National Natural Science Foundation of China (NSFC) 111 Project of China |
ISSN: | 2041-1723 2041-1723 |
DOI: | 10.1038/ncomms4297 |