Dislocation damping in zinc single crystals

Abstract

Impact shear tests of the Kolsky Thin Wafer type were used to determine the effects of temperature and strain rate on the critical resolved shear stress for basal slip in zinc single crystals.ll.t the high strain rates the flow stress was found to increase lineo.rlywith thl~ plastic strain rate and was independent of temperature.The observed behavior CQUld be rationalized in terms of Mason 's.dislocation drunping model where the friction force acting on a dislocation results fro1n phonon viscosity; "" ,.