[SY-B9] Modeling of dislocation climb assisted glide in crystal plasticity models
We present crystal plasticity modeling of climb assisted glide in fcc, bcc and hcp metals. Dislocation density is divided into edge and screw characters. Dislocation density evolution takes care of non-schmid effect and the effect of screw dislocation core assymetry in hcp metals. A chemical stress component due to non-equilibrium vacancy concentration acts on edge dislcoations and is called drag-stress. This chemical stress component depends strongly on crystallographic orientation as well if the vacancy concentration is low. Evolution of chemical stress and thus dislocation climb rate is discussed as a function of dislocation density, strain, crystallographic orientation and temperature. Model is calibrated against data from literature. The model is able to predict mechanical behavior under conditions of creep. Also, depending on whether creep occurs or not, the model is able predict crystallographic texture during deformation. Such model has been used for modeling of irradiation in Zr and zircaloys.