直流电场对A1-10%Si亚共晶合金凝固组织的影响  

Effect of Direct Current Electric Field on the Microstructure of Al-10%Si Hypoeutectic Alloy

作　　者：黄立国[1] 高志玉[1] 张志明[1] 

机构地区：[1]辽宁工程技术大学材料科学与工程系,辽宁阜新123000

出　　处：《铸造技术》2009年第5期650-652,共3页Foundry Technology

摘　　要：对在不同电流密度的直流电场作用下A1-10%Si亚共晶合金凝固组织的变化进行了研究。结果表明,直流电场改变了Si相的生长形态,随着电流密度的增加,Si相经历了一次细化过程,电场的作用增加了Al-Si合金中的潜在形核质点,电流密度达到28.3mA/mm2时,形核率达到了最大值,电场对Si的生长有抑制作用。Variation of the solidified microstructures of A1-10%Si hypoeutectic alloy under different direct current electric field were studied. The results show that the growth shape of eutectic Si is changed by the effect of electric field, and the grain refinement of eutectic Si occurs as the DC current density increases. The potential nucleate particles in AI-Si alloy are increased when it was exposed in the electric field, The maximum nucleation rate of AI-Si hypoeutectic alloy can be reached at the current density of 28.3 mA/mm2, and the growth of Si is restrained by the application of electric field.

关 键 词：凝固组织 直流电场 A1 SI合金 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG113.12[金属学及工艺—金属材料]