连续电流场对共晶铝合金凝固过冷度的影响  

Effect of Successive Current Field on Supercooling Degree of Eutectic Aluminum Alloy

作　　者：黄立国[1] 付大军[1] 高志玉[1] 

机构地区：[1]辽宁工程技术大学材料科学与工程学院,辽宁阜新123000

出　　处：《热加工工艺》2011年第23期56-58,共3页Hot Working Technology

摘　　要：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 effect of alternating current （AC） electric field and the direct current （DC） electric field on the supercooling degree of eutectic Al-Si and Al-Cu alloys was studied. The results show that both AC field and DC field can make the eutectic alloy experience a process of increasing first and then decreasing in super cooling. When the density of DC is up to 16.98 mA/mm^2, the degree of super cooling reaches the maximum; and the degree is maximum when the density of AC is 33.97 mA/mm^2. According to the analysis, it is the comprehensive work of the electrotransport effect and heat effect that leads to the change of the super cooling degree of eutectic Al-Si and Al-Cu alloys.

关 键 词：电流场 AL-SI共晶合金 Al-Cu共晶合金 过冷度 

分 类 号：TG244.3[金属学及工艺—铸造]