aDepartment of Engineering Mechanics, School of Aerospace, Tsinghua University, Beijing 100084, China
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Atypical three-stage-hardening mechanical behavior of Cu single-crystal micropillars
Z.L. Liua, X.M. Liua, Z. Zhuanga and X.C. Youa
Received 18 October 2008; revised 8 December 2008; accepted 8 December 2008. Available online 24 December 2008.
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.Keywords: Dislocation dynamics; Spiral sources; Dislocation networks; Dislocation starvation hardening
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