脉冲电流对Al及Al-5.3%Zn合金宏观组织的影响  

Effect of Pulse Electric Current on the Macrostructure of Al and Al-5.3% Zn Alloy

作　　者：班春燕[1] 崔建忠[1] 巴启先[1] 张北江[1] 

机构地区：[1]东北大学材料电磁过程教育部重点实验室,辽宁沈阳110004

出　　处：《铸造技术》2004年第4期238-239,共2页Foundry Technology

基　　金：国家重大基础研究发展规划("973")项目;编号:G199906490501

摘　　要：研究脉冲电流作用下凝固的纯Al及Al 5.3%Zn合金的宏观组织变化。实验表明:脉冲电流能够对纯Al及Al 5.3%Zn合金中晶粒的形状和尺寸产生比较显著的影响。与未施加脉冲电流相比,晶粒得到细化、等轴化。脉冲电流作用下剧烈的强迫对流促进晶粒从型壁上游离,增加金属熔体的形核率,晶粒得到细化。The change of macrostructure of pure Al and Al-5.3%Zn alloy with pulse electric current is studied. It is found that the pulse electric current can produce an obvious effect on the shape and size of grain in pure Al and Al-5.3%Zn alloy. Comparing with the solidified sample in the absence of pulse electric current, the grain is refined and equiaxed with pulse electric current because compelling convection can promote the grain dissociate from mold wall, and increase nucleation rate.

关 键 词：脉冲电流 宏观组织 强迫对流 

分 类 号：TG113.1[金属学及工艺—物理冶金]