中频低压脉冲电流对纯铝凝固组织的影响  

Effects of Pulsed Electric Current with Main Frequency and Low Voltage on Grain Refinement of Pure Aluminum

作　　者：方燕[1] 廖希亮[1] 甘长红[1] 龚勇永[1] 翟启杰[1] 

机构地区：[1]上海大学

出　　处：《特种铸造及有色合金》2006年第3期141-143,共3页Special Casting & Nonferrous Alloys

基　　金：国家973计划资助项目前期研究专项项目(2004CCA07000);上海市科学技术委员会优秀学科带头人计划资助项目(04XD14008)

摘　　要：通过调整脉冲电流峰值和脉冲频率，研究了中频低压脉冲电流对纯铝凝固组织的影响。试验结果表明：中频低压脉冲电流可使纯铝的凝固组织由柱状晶转变为等轴晶，电流峰值在500～6000A、脉冲频率在100～1000Hz范围内，随着脉冲电流峰值和脉冲频率的提高，等轴晶不断细化，等轴晶晶区面积增大。Effects of pulsed electric current with main frequency and low voltage on solidification structure of pure aluminum were investigated by the adjustment of peak intensity and frequency of pulsed current. The results reveal that the pulsed current with main frequency and low voltage can convert column crystal into equiaxed crystal in solidification of pure aluminum ranging in 500~6 000 A of current peak value and 100~1 000 Hz of frequency. With the increase of current peak value and frequency, equiaxed crystal is remarkably refined and its area is broadened.

关 键 词：脉冲电流 电流峰值 脉冲频率 晶粒细化 

分 类 号：TG111.4[金属学及工艺—物理冶金]