Grain rotation mediated by grain boundary dislocations in nanocrystalline platinum

Wang, Lihua; Teng, Jiao; Liu, Pan; Hirata, Akihiko; Ma, En; Zhang, Ze; Chen, Mingwei; Han, Xiaodong

doi:10.1038/ncomms5402

Grain rotation mediated by grain boundary dislocations in nanocrystalline platinum

Journal Article · Thu Jul 17 00:00:00 EDT 2014 · Nature Communications

DOI:https://doi.org/10.1038/ncomms5402· OSTI ID:1623950

Wang, Lihua ^[1]; Teng, Jiao ^[2]; Liu, Pan ^[3]; Hirata, Akihiko ^[3]; Ma, En ^[4]; Zhang, Ze ^[5]; Chen, Mingwei ^[3]; Han, Xiaodong ^[6]

Beijing Univ. of Technology (China). Inst. of Microstructures and Property of Advanced Materials; DOE/OSTI
Univ. of Science and Technology, Beijing (China). Dept. of Material Physics and Chemistry
Tohoku Univ., Sendai (Japan). WPI-Advanced Inst. for Materials Research
Johns Hopkins Univ., Baltimore, MD (United States). Dept. of Materials Science and Engineering
Beijing Univ. of Technology (China). Inst. of Microstructures and Property of Advanced Materials; Zhejiang Univ., Hangzhou (China). State Key Lab. of Silicon Materials
Beijing Univ. of Technology (China). Inst. of Microstructures and Property of Advanced Materials

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.

View Accepted Manuscript (DOE)

Research Organization:: Johns Hopkins Univ., Baltimore, MD (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: FG02-03ER46056

OSTI ID:: 1623950

Journal Information:: Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 5; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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