静磁场复合直流电流作用下Al-Zn合金凝固时的相迁移  

Phase Migration in Solidified Al-Zn Alloy with Superimposing Parallel Static Magnetic Field and Electric Current

作　　者：阳祥富[1] 钟云波[1] 傅小明[1] 王江[1] 任忠鸣[1] 黄靖文 雷作胜[1] 

机构地区：[1]上海大学上海市现代冶金与材料制备重点实验室,上海200072 [2]上海核威实业有限公司,上海201615

出　　处：《稀有金属材料与工程》2007年第A03期158-162,共5页Rare Metal Materials and Engineering

基　　金：上海市科委启明星跟踪计划的资助(04qmh1412);教育部全国一百篇优秀博士学位论文作者基金资助(200235);教育部重点资助项目(204166)

摘　　要：在Al-10%Zn合金液凝固时,向熔体中施加恒定直流电流的同时施加了一个与电流方向平行的稳恒磁场,考察了在磁场作用下合金中α-Al相颗粒的迁移行为。实验结果表明:在同时施加静磁场时,合金凝固时析出的α-Al相颗粒可以在10~0～10~1A/cm^2的电流密度下向阴极发生迁移,而单独施加磁场或施加电流不能使相颗粒迁移;当施加的电流密度一定时,α-Al相的偏移率随着磁感应强度的增大而增大;当磁感应强度一定时,α-Al相的偏移率随着电流密度增大而增大。理论分析表明,电子流经相颗粒时形成的不对称涡旋流动导致了α-Al相颗粒向阴极的定向迁移。Migration of the α-Al phase in solidified Al-10wt%Zn alloy simultaneously imposed a DC electric current and a parallel static magnetic field was investigated. It was found that, the α-Al particles would migrate toward the cathode by superimposing a parallel magnetic field and an electric current with current density of 10^0～10^1A/cm^2, while no migration of α-Al particles was observed only by superimposing electric current or magnetic field. The area fraction of migrated α-Al was increased with increasing magnetic flux density or increasing electric current. The theoretical analysis showed that, the asymmetry vortex before and behind the phase particle resulted from the curve of the electric current when electron passing through the particle induced the directional migration of α-Al phase toward the cathode.

关 键 词：静磁场 直流电流 相迁移 涡旋流动 

分 类 号：TG111.4[金属学及工艺—物理冶金]