Abstract
The influence of deformation rate on the ultrasonic attenuation of aluminum single crystals has been investigated over a strain rate range from 2 × 10 −5 sec −1 to 20 sec −1. In order to make this study a technique was developed which permits ultrasonic attenuation measurements to be made up to a rate of 1800 measurements/sec. The attenuation data exhibit marked strain rate effects in comparison with conventional stress-strain curves. In addition, attenuation data recorded during the rapid recovery period immediately subsequent to unloading show that the recovery behavior is dependent on the rate of removal of the externally applied load. Subsequent microplastic loading experiments are also affected by the initial deformation rate.
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