Stress dependences of dislocation velocities

摘要: Abstract Motion of a dislocation through crystal is treated as comprising jumps past relatively disperse obstacles and viscous glide the clear lattice between obstacles. Well-known expressions for velocity dependence upon stress these two types motion are combined in series to obtain an expression overall velocity. This investigated terms three parameters: stress, drag ratio limiting ratio. It shown that under some circumstances no relationship exists average parameters determinable from ultrasonic attenuation. Furthermore, this treatment qualitatively reconciles apparently anomalous observations with fairly simple theory motion.