高密度脉冲电流对A356铝合金低温熔体凝固组织的影响  

EFFECT OF HIGH DENSITY PULSE ELECTRIC CUR-RENT ON THE SOLIDIFICATION STRUCTURE OF LOWTEMPERATURE MELT OF A356 ALUMINIUM ALLOY

作　　者：何树先[1] 王 俊[1] 周尧和[1] 

机构地区：[1]上海交通大学材料科学与工程学院,上海200030

出　　处：《金属学报》2002年第5期479-482,共4页Acta Metallurgica Sinica

基　　金：美国GM(中国)公司基金资助项目

摘　　要：研究了高密度脉冲电流对A356铝合金低温熔体凝固组织的影响,实验中对680和630℃的低温熔体施加脉冲电流处理,对比试验和凝固曲线侧试结果表明．低温熔体中施加脉冲电流有利于增大凝固过冷度,提高冷却速率,缩短凝固时间,细比凝固组织,同时,经脉冲电流处理后,随熔体的保温时间延长．凝固组织逐渐粗化,分析认为,低温熔体结构比凝固过程本身更能影响最终凝固组织。The effect of high density pulse electric current (HDPEC) on the solidification structure of the low temperature melt(LTM) of commercial A356 aluminum alloy was investigated. In the experiments, the HDPEC was discharged in the LTM(680 and 630 degreesC). The control experiments and cooling curve test show that HDPEC discharged in LTM can increase the undercooling and cooling rate of the solidification, shorten the cooling time and refine the solidification structure. Meanwhile, the holding time of melt treated has an adverse effect on the solidification structure. The longer of the holding time of the melt treated with HDPEC, the coarser the microstructure is. It is analyzed that the effect of the structure of LTM on the final solidification structure is more important than that of the solidification course.

关 键 词：高密度脉冲电流 A356铝合金 低温熔体 凝固组织 

分 类 号：TG146.21[一般工业技术—材料科学与工程]