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

Research output: Contribution to journalArticle

170 Citations (Scopus)

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.

Original languageEnglish
Article number4402
JournalNature Communications
Volume5
DOIs
Publication statusPublished - 2014 Jul 17
Externally publishedYes

Fingerprint

Platinum
Dislocations (crystals)
Grain boundaries
platinum
grain boundaries
Temperature
plastic properties
Plasticity
Metals
Electrons
Grain boundary sliding
Polycrystalline materials
misalignment
sliding
Creep
Electron microscopes
electron microscopes
Crystallization
Thin films
high resolution

ASJC Scopus subject areas

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

Cite this

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.

In: Nature Communications, Vol. 5, 4402, 17.07.2014.

Research output: Contribution to journalArticle

Wang, Lihua ; Teng, Jiao ; Liu, Pan ; Hirata, Akihiko ; Ma, En ; Zhang, Ze ; Chen, Mingwei ; Han, Xiaodong. / Grain rotation mediated by grain boundary dislocations in nanocrystalline platinum. In: Nature Communications. 2014 ; Vol. 5.
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