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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.

journal_name

Nat Commun

journal_title

Nature communications

authors

Wang L,Teng J,Liu P,Hirata A,Ma E,Zhang Z,Chen M,Han X

doi

10.1038/ncomms5402

subject

Has Abstract

pub_date

2014-07-17 00:00:00

pages

4402

issn

2041-1723

pii

ncomms5402

journal_volume

5

pub_type

杂志文章

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