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3366652 
Journal Article 
Flow Stress in Submicron BCC Iron Single Crystals: Sample-size-dependent Strain-rate Sensitivity and Rate-dependent Size Strengthening 
Huang, Rui; Li, Q; Wang, Z; Huang, L; Li, Ju; Ma, E; Shan, Z 
2015 
3 
3 
121-127 
WOS:000372219300001 
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. 
single-crystal alpha-Fe; size effect; strain-rate sensitivity; Orowan equation; source truncation hardening 
IRIS
• Molybdenum
     Litsearch 2018
          WOS