Ultrasonic Behavior of Tin-Bismuth Alloys during Solidification Process

Abstract

Sound velocity and its attenuation during solidification process in tin-bismuth alloys of three different chemical compositions, Bi/(Bi+Sn)=57.0 wt% (eutectic), 63.5 and 66.7 wt% (hypereutectic), have been measured by the pulse transmission method. The frequency of sound used was 1 MHz. During solidification process, 57.0 the sound velocity and the attenuation in eutectic alloy showed continuous change with temperature, but those of hypereutectic alloys showed discontinuous change with temperature. By combining the present results with our previous data on sound velocity and attenuation in melting process, discussion was made on the ultrasonic behavior at melting point in simple binary system of tin-bismuth alloy.