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000010980 084__ $$2WoS$$aChemistry, Physical
000010980 084__ $$2WoS$$aMaterials Science, Multidisciplinary
000010980 084__ $$2WoS$$aPhysics, Applied
000010980 084__ $$2WoS$$aPhysics, Condensed Matter
000010980 1001_ $$0P:(DE-Juel1)VDB5029$$aHeggen, M.$$b0$$uFZJ
000010980 245__ $$aPlastic deformation mechanism in complex solids
000010980 260__ $$aBasingstoke$$bNature Publishing Group$$c2010
000010980 300__ $$a332 - 336
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000010980 440_0 $$011903$$aNature Materials$$v9$$x1476-1122
000010980 500__ $$aWe thank C. Thomas and M. Schmidt for producing the materials and J. Barthel for carrying out the HAADF-STEM image simulation. This work was supported by the 6th Framework EU Network of Excellence 'Complex Metallic Alloys' (Contract No. NMP3-CT-2005-500140) and the Deutsche Forschungsgemeinschaft, (PAK 36).
000010980 520__ $$aIn simple crystalline materials, plastic deformation mostly takes place by the movement of dislocations. Although the underlying mechanisms in these materials are well explored, in complex metallic alloys--crystalline solids containing up to thousands of atoms per unit cell--the defects and deformation mechanisms remain essentially unknown. Owing to the large lattice parameters of these materials, extended dislocation concepts are required. We investigated a typical complex metallic alloy with 156 atoms per unit cell using atomic-resolution aberration-corrected transmission electron microscopy. We found a highly complex deformation mechanism, based on the movement of a dislocation core mediating strain and separate escort defects. On deformation, the escort defects move along with the dislocation core and locally transform the material structure for the latter. This mechanism implies the coordinated movement of hundreds of atoms per elementary glide step, and nevertheless can be described by simple rearrangement of basic structural subunits.
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000010980 7001_ $$0P:(DE-Juel1)VDB4944$$aHouben, L.$$b1$$uFZJ
000010980 7001_ $$0P:(DE-Juel1)130637$$aFeuerbacher, M.$$b2$$uFZJ
000010980 773__ $$0PERI:(DE-600)2088679-2$$a10.1038/nmat2713$$gVol. 9, p. 332 - 336$$p332 - 336$$q9<332 - 336$$tNature materials$$v9$$x1476-1122$$y2010
000010980 8567_ $$uhttp://dx.doi.org/10.1038/nmat2713
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