在不同温度测量Sn 20％Pb合金直流电阻时,沿纵向施加交流磁场.结果发现:对固态样品,无论是在室温还是在接近固相线的温度,磁场都没有引起电阻增加.对液态样品,施加磁场后,电阻开始逐渐增大,停止施加磁场,增大的电阻维持一段时间不变后,才缓慢恢复到施加磁场前的初始值.金相显微镜和扫描电镜结果表明,交流磁场不仅使初生β-Sn的晶粒明显细化,还使Pb在初生β-Sn的晶粒内的含量增加,且Pb的分布更均匀.利用无序理论,对实验结果进行定性讨论,认为交流磁场的电磁搅拌作用破坏了Sn-20％Pb熔体的短程有序,增大了系统的无序度,使部分扩展态电子转变成局域态电子,从而使熔体的电阻增大.
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