Molecular dynamics and quasi-two dimensional dislocation dynamics simulations on the Orowan pinning mechanism of a mixed dislocation in FCC metals

Itakura, Mitsuhiro  ; Kadoyoshi, Tomoko; Kaburaki, Hideo

Molecular dynamics and quasi-two dimensional dislocation dynamics simulations have been performed to find the Orowan hardening mechanism of a mixed dislocation in FCC metals. The effects of the dissociation of a dislocation in FCC metals on the stress-strain relation, in particular, the pinning strength of a leading and trailing partial dislocation, have been determined by these methods. We focus on studying the pinning behavior of a mixed dislocation, including an edge and a screw dislocation, as a function of the length between the Orowan pinning sites.