The Young's modulus (E) and Poisson's ratio () of Sn-based lead-free solders as Sn-3.5Ag, Sn-58Bi and Sn-9Zn (compositions in mass%) were measured at various temperatures between À50 and 100 C using an ultrasonic pulse echo method. The values of Young's modulus and Poisson's ratio were obtained at 25 C. These values coincide with the room temperature values in the literature. The Young's modulus and Poisson's ratio between À50 and 100 C were also measured for Sn-58Bi, Sn-9Zn, and Sn-37Pb.
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