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研究了直流电流场和交流电流场对A1-Si、Al-Cu共晶合金凝固过冷度的影响。结果表明:直流电流场和交流电流场都使合金凝固过冷度经历了一次先增大后减小的过程。当直流密度达到16.98mA/mm2时,过冷度达到最大值;交流密度达到33.97mA/mm2时,过冷度达到最大值。分析表明:A1-Si、Al-Cu共晶合金凝固过冷度的变化是电传输效应和Jouler热效应综合作用的结果。
The effects of DC current and AC current on the undercooling of A1-Si and Al-Cu eutectic alloys were studied. The results show that both the DC current field and the AC current field make the alloy undercooling once undergo the first increase and then decrease. When the DC density reaches 16.98mA / mm2, the undercooling reaches the maximum value. When the AC density reaches 33.97mA / mm2, the undercooling reaches the maximum value. The analysis shows that the change of solidification undercooling of A1-Si and Al-Cu eutectic alloys is the result of the combined effect of electric transmission and Jouler thermal effect.