Ag添加InSn合金における凝固過程の変化と組織への影響

抄録

The mechanical strength of In-48mass%Sn eutectic solder has high variation because the microstructure is formed with nonuniformity structure during solidification process. In this paper, the effect of Ag addition for solidification process of In-48mass%Sn eutectic solder was investigated to suppress the variation of the strength. It was found that not only crystallization peak but also exothermic peak around 70 – 90℃ was detected in Differential Scanning Calorimetry (DSC) analysis. This peak was the transformation peak from non-equilibrium phase to equilibrium phase. And more, in this study, it was found the exothermic peak around 70 – 90℃ disappeared due to decreasing In concentration in liquid phase by adding Ag and a variation of the mechanical strength of InSn solder was suppressed by Ag addition.