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Grain rotation mediated by grain boundary dislocations in nanocrystalline platinum.


ABSTRACT: 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 ~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.

SUBMITTER: Wang L 

PROVIDER: S-EPMC4109021 | biostudies-literature | 2014 Jul

REPOSITORIES: biostudies-literature

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Grain rotation mediated by grain boundary dislocations in nanocrystalline platinum.

Wang Lihua L   Teng Jiao J   Liu Pan P   Hirata Akihiko A   Ma En E   Zhang Ze Z   Chen Mingwei M   Han Xiaodong X  

Nature communications 20140717


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 ~15 nm. Here, in tensile-loaded Pt thin films under a high-resolution transmission electron microscope, we show that the plasticity mechanism transi  ...[more]

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