The theories of dislocation dynamics of plastic flow were based on the mean velocity of dislocations, whereas, the experimental results were correlated to the applied strain rate. The mutual dependence of velocity, strain rate and structure was usually assumed to be given by the Orowan relation, γt = ρmνb, where ρm was the mobile dislocation density and b was the magnitude of the Burgers vector. Since ρm was not directly accessible, it was related to the total dislocation density, ρt, by ηρt, where η was less than 1. The mean slip velocity, λt, derived from slip kinematics conformed to the requirements of the rate of power dissipation. Using this definition and its correlation to γt, an independent measure of v could be calculated and compared with that from the Orowan relation. The resultant values for rolled Cu and Al at room temperature indicate that the onset of dynamic recovery increased λt with strain.

Correlation of the Applied Strain Rate with the Operative Mean Slip and Dislocation Velocities. S.Saimoto: Materials Science and Engineering A, 2004, 387-389, 129-32