Journal
NATURE COMMUNICATIONS
Volume 5, Issue -, Pages -Publisher
NATURE PORTFOLIO
DOI: 10.1038/ncomms5402
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Funding
- National Natural Science Foundation [11234011, 11127404, 10102001201304]
- Beijing 211 Project
- Specialized Research Fund for the Doctoral Program of Higher Education of China [3C102001201301]
- Materials Sciences and Engineering Division, Office of Basic Energy Sciences (BES), US Department of Energy (DOE) [DE-FG02-09ER46056]
- 'World Premier International (WPI) Research Center Initiative for Atoms, Molecules and Materials', MEXT, Japan
- [PXM201101420409000053]
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Grain rotation is a well-known phenomenon during high (homologous) temperature deformation and recrystallization of polycrystalline materials. In recent years, grain rotation has also been proposed as a plasticity mechanism at low temperatures (for example, room temperature for metals), especially for nanocrystalline grains with diameter d less than similar to 15 nm. Here, in tensile-loaded Pt thin films under a high-resolution transmission electron microscope, we show that the plasticity mechanism transitions from cross-grain dislocation glide in larger grains (d> 6 nm) to a mode of coordinated rotation of multiple grains for grains with d< 6 nm. The mechanism underlying the grain rotation is dislocation climb at the grain boundary, rather than grain boundary sliding or diffusional creep. Our atomic-scale images demonstrate directly that the evolution of the misorientation angle between neighbouring grains can be quantitatively accounted for by the change of the Frank-Bilby dislocation content in the grain boundary.
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