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The ultrasonic attenuation in specimens undergoing dynamic plastic deformation was measured for polycrystalline high purity aluminium over the strain rate range up to 8000 / sec and at temperatures ranging up to 500 K. The results were analysed to obtain information on the behaviour of dislocations at high rates of strain. Emphasis was put on the transition in the rate controlling mechanism of the dislocation motion from the thermal activation to the viscous drag. It was found that the transition occurs gradually over the strain rate range from 103to 104/sec

AN ULTRASONIC STUDY OF THE RATE CONTROLLING MECHANISM OF DISLOCATION MOTION AT HIGH RATES OF STRAIN