Abstract
The variation of elastic wave velocities with composition has been measured for four eutectic binary systems, namely, Pb–Sn, Cu–Ag, Pb–Sb and Sn–Zn alloys, using the ultrasonic wedge-method. The variation of the calculated moduli is illustrated graphically. The moduli are found to vary continuously with a change in rate of variation at the eutectic composition. Hence the course of the moduli (Young’s and rigidity moduli) curves can be taken as a helpful guide in corroborating metallurgical data on the composition at which eutectic formation occurs. A qualitative explanation of the change in rate of variation at the eutectic composition is offered by considering the behaviour of alloy at the eutectic composition as a composite metal.
