Atypical three-stage-hardening mechanical behavior of CU single-crystal micropillars

作者：Liu Z L; Liu X M; Zhuang Z^*; You X C

来源：Scripta Materialia, 2009, 60(7): 594-597.

DOI：10.1016/j.scriptamat.2008.12.020

• Dislocation dynamics
• Spiral sources
• Dislocation networks
• Dislocation starvation hardening

Three-dimensional discrete dislocation dynamics simulations have been used to study the stress-strain response of Cu single-crystal micropillars containing initial dislocation networks. When such networks are loaded, we find that the stress-strain curve can be divided into three distinct stages: a linear elastic stage, a normal strain hardening stage and a "dislocation starvation hardening" stage accompanying a rather high stress level. Finally, a perfect dislocation-free pillar is obtained in our simulations.

• 出版日期2009-4
• 单位清华大学