The Investigation of Size Effect for Dislocation Starvation Mechanism UNDER Cu Single-Crystal Micro-Pillar Compression.

The stress-strain response of Cu single-crystal compression micro-pillar containing initial dislocation networks has been investigated in this paper by three-dimensional discrete dislocation dynamics simulations. It demonstrates that the stress-strain curves can be divided into three types of hardening curves corresponding to increase micro-pillar sizes: the three-stage exhaustion hardening curve, multi-stage mixed hardening curve and two-stage conventional forest hardening curve. The characteristic dimensions of the pillars have been determined to differentiate three types of hardening curves. [ABSTRACT FROM AUTHOR]