Portal de Periódicos da CAPES

Simulation of the plastic flow in Ni 3 Al: Work hardening and strain-rate sensitivity

1999; Taylor & Francis; Volume: 79; Issue: 7 Linguagem: Inglês

10.1080/01418619908210382

0141-8610

Benoît Devincre, P. Veyssière, G. Saada,

Intermetallics and Advanced Alloy Properties

Abstract The origin of the anomalous temperature dependence of the giant work-hardening rate and of the modest strain-rate sensitivity observed in many L12 alloys is investigated by means of an 'end-on' simulation of dislocation dynamics in Ni3Al. The present model reproduces most of the atypical mechanical properties observed experimentally. The study of the evolution of the distribution of the Kear-Wilsdorf locks during plastic deformation indicates that the order of magnitude of the work-hardening rate stems from a preferred exhaustion of the weakest locks. In addition, the low strain-rate sensitivity measured is found to rely on the absence of a correlation between the dislocation properties which provide the plastic strain and those which determine the flow stress level.