Flow Stress in Submicron BCC Iron Single Crystals: Sample-size-dependent Strain-rate Sensitivity and Rate-dependent Size Strengthening

Rui Huang; Qing-Jie Li; Zhang-Jie Wang; Ling Huang; Ju Li; Evan Ma; Zhi-Wei Shan

doi:10.1080/21663831.2014.999953

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Flow Stress in Submicron BCC Iron Single Crystals: Sample-size-dependent Strain-rate Sensitivity and Rate-dependent Size Strengthening

Report | 更新时间：2026-08-19

- Flow Stress in Submicron BCC Iron Single Crystals: Sample-size-dependent Strain-rate Sensitivity and Rate-dependent Size Strengthening
- Materials Research Letters Vol. 3, Issue 3, Pages: 121-127(2015)
- 作者机构：
  
  1. Center for Advancing Materials Performance from the Nanoscale (CAMP-Nano) & Hysitron Applied Research Center in China (HARCC) State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University
  2. Department of Nuclear Science and Engineering Massachusetts Institute of Technology 77 Massachusetts Avenue Cambridge 39 USA,MA021
  3. Department of Materials Science and Engineering Massachusetts Institute of Technology 77 Massachusetts Avenue Cambridge
  4. Center for Advancing Materials Performance from the Nanoscale (CAMP-Nano) & Hysitron Applied Research Center in China (HARCC) State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University Xi'an People's Republic of China,710049
  5. Department of Materials Science and Engineering Johns Hopkins University Baltimore
- 作者简介：
- 基金信息：
- DOI：10.1080/21663831.2014.999953
  CLC：
- Online First：08 January 2015，
  
  Published：2015
- 稿件说明：
移动端阅览
Rui Huang, Qing-Jie Li, Zhang-Jie Wang, et al. Flow Stress in Submicron BCC Iron Single Crystals: Sample-size-dependent Strain-rate Sensitivity and Rate-dependent Size Strengthening[J]. Materials Research Letters, 2015, 3(3): 121-127.
DOI：

Rui Huang, Qing-Jie Li, Zhang-Jie Wang, et al. Flow Stress in Submicron BCC Iron Single Crystals: Sample-size-dependent Strain-rate Sensitivity and Rate-dependent Size Strengthening[J]. Materials Research Letters, 2015, 3(3): 121-127. DOI： 10.1080/21663831.2014.999953.

摘要

Abstract

Through

in situ

scanning electron microscope microcompression tests

we demonstrated that the strain-rate sensitivity of body-centered cubic single crystal iron pillars will be reduced by one order when the pillar size was reduced from 1000 to about 200 nm. In addition

size-strengthening exponent exhibited obvious strain-rate dependence. We propose that the observed behavior is a result of the high stresses required to induce curvature bowout of dislocation arms at small sample or grain sizes

which overwhelms the lattice friction stress contribution and diminishes the role played by the mobility difference between edge and screw dislocations.

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