Abstract
Using the apparatus described in the preceding report, the effects of superimposed ultrasonic vibration on compressive deformation were investigated with several materials. The flow stress of compression can be reduced by superimposing the vibration. However, the effectiveness differs with the kind of specimen, being related to the characteristics of materials such as the acoustic impedance, Young’s modulus, melting point, work-hardenability and stacking-fault energy. With increasing amplitude of vibration, the rise of temperature becomes more remarkable, but it shows material dependence. The hardness distribution of the worked piece is also influenced by the vibration.
