Flow Stress in Submicron BCC Iron Single Crystals: Sample-size-dependent Strain-rate Sensitivity and Rate-dependent Size Strengthening
Author(s)Huang, Rui; Li, Qing-Jie; Wang, Zhang-Jie; Huang, Ling; Li, Ju; Ma, Evan; Shan, Zhi-Wei; ... Show more Show less
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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.
DepartmentMassachusetts Institute of Technology. Department of Materials Science and Engineering; Massachusetts Institute of Technology. Department of Nuclear Science and Engineering
Materials Research Letters
Hindawi Publishing Corporation
Huang, Rui et al. “Flow Stress in Submicron BCC Iron Single Crystals: Sample-Size-Dependent Strain-Rate Sensitivity and Rate-Dependent Size Strengthening.” Materials Research Letters 3.3 (2015): 121–127.
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