Grain Size Effect on Deformation Mechanisms of Nanocrystalline bcc Metals

G.M. Cheng; W.W. Jian; W.Z. Xu; H. Yuan; P.C. Millett; Y.T. Zhu

doi:10.1080/21663831.2012.739580

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Grain Size Effect on Deformation Mechanisms of Nanocrystalline bcc Metals

Original Reports | 更新时间：2026-08-19

- Grain Size Effect on Deformation Mechanisms of Nanocrystalline bcc Metals
- Grain Size Effect on Deformation Mechanisms of Nanocrystalline bcc Metals
- 材料研究快报（英文） 2013年1卷第1期页码：26-31
- 作者机构：
  
  1. Department of Material Science and Engineering North Carolina State University Raleigh NC
  2. Fuels Modeling and Simulations Idaho National Laboratory Idaho Falls ID
- 作者简介：
- 基金信息：
- DOI：10.1080/21663831.2012.739580
  中图分类号：
- 网络首发：2012-11-29，
  
  纸质出版：2013
- 稿件说明：
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G.M. Cheng, W.W. Jian, W.Z. Xu, 等. Grain Size Effect on Deformation Mechanisms of Nanocrystalline bcc Metals[J]. 材料研究快报（英文）, 2013,1(1):26-31.

G.M. Cheng, W.W. Jian, W.Z. Xu, et al. Grain Size Effect on Deformation Mechanisms of Nanocrystalline bcc Metals[J]. Materials Research Letters, 2013, 1(1): 26-31.
G.M. Cheng, W.W. Jian, W.Z. Xu, 等. Grain Size Effect on Deformation Mechanisms of Nanocrystalline bcc Metals[J]. 材料研究快报（英文）, 2013,1(1):26-31. DOI： 10.1080/21663831.2012.739580.

G.M. Cheng, W.W. Jian, W.Z. Xu, et al. Grain Size Effect on Deformation Mechanisms of Nanocrystalline bcc Metals[J]. Materials Research Letters, 2013, 1(1): 26-31. DOI： 10.1080/21663831.2012.739580.

摘要

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.

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