本文采用直流四电极法研究了Sn-3.5Ag-3.5Bi焊料熔体在连续两轮的升降温过程中电阻率随温度的变化关系,以此为基础进一步研究了该合金在650℃和800℃保温7h及随后的升温过程中电阻率的变化规律.结果表明,Sn-3.5Ag-3.5Bi合金中存在液-液结构转变,并且该结构转变在第一轮升温后是可逆的.结合保温及随后升温实验结果可知在第一轮升温过程中的结构转变是由不可逆和可逆两种不同类型的结构转变组成的.文章还从短程有序的角度分析了引起这两种转变的机制.
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