Tensile behavior and superplastic deformation of SnBiCu alloy

Abstract

The purpose of this study is to clarify the tensile behavior and deformation mechanism of the Sn40Bi0.1Cu alloy (mass%). Tensile tests of Sn40Bi0.1Cu were performed at temperatures of 298, 333, and 353 K and strain rates from 5.25 © 1015 to 5.25 © 1012 s11. The tensile strength decreased and the elongation increased with increasing temperature and decreasing strain rate. Sn40Bi0.1Cu shows superplastic behavior at temperatures of >333 K and low strain rates of <5.25 © 1014 s11. Microstructural observation after superplastic deformation of Sn40Bi0.1Cu showed that the primary crystal Sn grains could not deform along the axial direction of applied tension in the superplastic regime. The eutectic phase contributed to superplastic deformation. The strain rate sensitivity m for Sn40Bi0.1Cu was <0.3.