PT Journal
AU Razafindrazaka, M
   Tanguy, D
   Delafosse, D
TI Defect hardening modeled in 2D discrete dislocation dynamics
SO Materials Science and Engineering: A
PY 2009
BP 150
EP 156
VL 527
IS 1-2
DI 10.1016/j.msea.2009.07.045
DE Dislocation theory; Hardening
AB Two-dimensional discrete dislocation dynamics simulations are used to model the plastic deformation of an fcc metallic material containing large densities of defects. An obstacle model is proposed, based on the line tension concept. Increasing yield strength and hardening are obtained when the obstacle density is increased and destroyable junctions are included. A high dislocation source density is used to obtain a good dissemination of dislocations. Over 30% of the total density is stored as junctions. Slip is shown to be localized within a few intense slip bands, whatever the obstacle density. This localization is quantified as a function of the density of obstacles.
ER