Grain rotation mediated by grain boundary dislocations in nanocrystalline platinum

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

研究成果: Article

192 引用 (Scopus)

抜粋

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.

元の言語English
記事番号4402
ジャーナルNature communications
5
DOI
出版物ステータスPublished - 2014 7 17
外部発表Yes

ASJC Scopus subject areas

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

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