探讨了铝硅合金变质前后电导率的差异及变化规律，采用涡流法检测了铝硅合金变质的效果；试验和生产实践均证明，检测仪显示的数字与变质效果有很好的对应关系。仪器具有检测速度快、判断准确、稳定性高、操作简便的优点，可避免因变质不良而造成的废品 The differences and changes of electrical conductivity before and after Al-Si alloy deterioration were discussed. The effect of Al-Si alloy deterioration was tested by the eddy current method. The tests and production practices proved that the figures displayed by the tester had a good correspondence with the metamorphic effect. The instrument has the advantages of fast detection speed, accurate judgment, high stability and easy operation, which can avoid the waste caused by bad quality modification