Grain Size Effect on Deformation Mechanisms of Nanocrystalline bcc Metals

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

  • G. M. Cheng
  • W. W. Jian
  • W. Z. Xu
  • H. Yuan
  • P. C. Millett

Detail(s)

Original languageEnglish
Pages (from-to)26-31
Journal / PublicationMaterials Research Letters
Volume1
Issue number1
Online published29 Nov 2012
Publication statusPublished - 2013
Externally publishedYes

Abstract

Nanocrystalline (NC) body-centered cubic (bcc) metals behave very differently from how NC metals with other crystal structures behave. Their strain rate sensitivity decreases with decreasing grain size, which is an observation that has not been well understood. Here, we report a significant effect of grain size on the deformation mechanism of NC bcc Mo. With decreasing grain size, the density of mixed and edge dislocations increases, while the density of screw dislocations decreases. When the grains become very small, the overall dislocation density decreases with decreasing grain size. These observations provide a logical explanation for the observed effect of grain size on strain rate sensitivity. © 2013 G. M. Cheng, W. W. Jian, W. Z. Xu, H. Yuan, P. C. Millett and Y. T. Zhu.

Research Area(s)

  • Bcc, Deformation Mechanism, Dislocation, Grain Size, Nanocrystalline

Citation Format(s)

Grain Size Effect on Deformation Mechanisms of Nanocrystalline bcc Metals. / Cheng, G. M.; Jian, W. W.; Xu, W. Z. et al.
In: Materials Research Letters, Vol. 1, No. 1, 2013, p. 26-31.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review