Microstructurally based cross-slip mechanisms and their effects on dislocation microstructure evolution in fcc crystals. (15th February 2015)

• Record Type: Journal Article
• Authors: Hussein, Ahmed M.; Rao, Satish I.; Uchic, Michael D.; Dimiduk, Dennis M.; El-Awady, Jaafar A.
• Is Part Of: Acta materialia. Volume 85(2015)
• Page Start: 180
• Page End: 190
• Publication Date: 2015-02-15
• Subjects: Cross-slip -- Dislocation dynamics -- Dislocation patterning -- Strain hardening; Materials -- Periodicals; Materials science -- Periodicals; Materials -- Mechanical properties -- Periodicals; Metallurgy -- Periodicals; Chemistry, Inorganic -- Periodicals; 620.112
• DOI: 10.1016/j.actamat.2014.10.067
• Languages: English
• ISSNs: 1359-6454

Abstract

Abstract: Three newly identified cross-slip mechanisms from atomistic simulations of fcc crystals, namely surface, bulk and intersection cross-slip types, were hierarchically informed into discrete dislocation dynamics simulations. The influence of each cross-slip type on the evolution of the dislocation microstructure in face-centered cubic microcrystals having different crystal sizes and initial dislocation densities was investigated. Dislocation pattern formation, surface slip localization and initial strain hardening were observed, in agreement with experimental observations, and possible explanations are given in the light of these simulations.