The tensile behavior of Sn-Bi-Cu., Sn-Bi-Ni., Sn-Bi-Zn., and Sn-Bi-Sb alloys has been widely investigated. The purpose of the present study is to measure the strain rate sensitivity index m of Sn-Bi binary alloys. Tensile tests for the measurement of the strain rate sensitivity index m were carried out at 25, 40, 60, and 80°C under three cross head speed velocities. The results showed that index m increased with Bi concentration and test temperature. Index m of Sn-Bi alloys at 60 and 80°C exceeded 3.0, 3.0 is the threshold of superplasticity deformation behavior. The Sn-Bi eutectic microstructure has greater effect on the superplasticity deformation in hypoeutectic Sn-Bi alloys.
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Yamauchi et al. (2024) studied this question.
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