Change in Ultrasonic Waveform during Tensile Deformation of Aluminum Alloy and Copper Alloy

摘要

Aluminum alloy A2024-T3 and copper alloy C2200-P plates were subjected to the tensile testing and the off-line and in-process ultrasonic measurements to obtain ultrasonic parameters, such as the relative peak intensity of Fourier spectrum of the bottom echo (RPI) and the average gradient of the transfer function (AGTF). The ultrasonic parameters (RPI and AGTF) obtained by the off-line and in-process measurements decreased with increasing plastic strain normalized by the maximum strain with the same rates for both alloys. The ultrasonic parameters measured with the water container showed the same tendency as those measured with the water bag, but decreased with the plastic strain with smaller fluctuation than those measured with the water bag.