电流对ZA42合金凝固方式的影响  

Influence on ZA42 Solidification Mode by Electric Current

作　　者：万刚[1] 武保林[1] 赵玉华[1] 姜耸[1] 

机构地区：[1]沈阳航空工业学院材料工程系,辽宁沈阳110034

出　　处：《铸造》2006年第3期304-306,共3页Foundry

摘　　要：研究了ZA42合金在不同电流强度作用下凝固方式的演变规律。结果表明:随着电流的增大,合金凝固过程中晶体的生长方式从典型的树枝晶转变为类似等轴晶,电流进一步增大时,最终又趋向于枝晶生长,并且组织得到细化。从电流对凝固界面的稳定性、溶质分配系数和过冷度的影响几个方面讨论了直流电流对ZA42合金凝固方式的作用机理。The solidification mode evolving regulars of ZA42 in different current intensity was studied in this paper. The results showed that, with increasing of direct current, the crystal growth modes changed from typical fir-tree crystal to similar equiaxed crystal, and the current increasing further, the final crystal was prone to dendritic mode again and its structure was refined. The directional current action mechanics in ZA42 solidification mode was discussed from following aspects： current effecting solidification interface stabilization, solute distribution coefficient and degree of supercooling.

关 键 词：直流电流 凝同方式 溶质分配系数 过冷 细化 

分 类 号：TG27[金属学及工艺—铸造]