强磁场对Cu-90%Pb合金凝固中比重偏析的影响  

EFFECT OF HIGH STATIC MAGNETIC FIELD ON SOLIDIFICATION STRUCTURE OF Cu-Pb MONOTECTIC ALLOYS

作　　者：史俊芳[1] 钟云波[1] 任忠鸣[1] 邓康[1] 徐匡迪[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

出　　处：《上海金属》2006年第1期22-27,共6页Shanghai Metals

基　　金：教育部全国博士学位论文作者基金项目(No.200235)

摘　　要：研究了强磁场对Cu-90%Pb合金中比重偏析的影响规律。结果表明:10T磁场下,当冷却速度达到100℃/min以上时,Cu-90%Pb合金中的重力偏析得到完全抑制;随着磁感应强度的增加,磁场对比重偏析的抑制作用增强。在30℃/min冷却速度下,12T磁场使该种合金凝固中的50微米直径颗粒上浮速度下降90%以上。理论分析表明:强磁场增加金属熔体粘度,降低自然对流,诱生洛伦兹力阻力来抑制颗粒上浮和聚合。The influence of 10Tesla high magnetic field on gravity segregation of Cu-90% Pb monotectic alloys was investigated by experiment. The results showed that gravity segregation in Cu-90% Pb alloy was fully suppressed in 10Tesla high static magnetic field when cooling rate reaclaed 100/min or above. With increasing magnetic flux density, the effects of high static magnetic field was enhanced, and under cooling rate of 30℃/min and in 12Tesla magnetic field, the stokes rising rate of 50gm second phase particles were reduced by 90% or more. Theoretical analysis showed that magnetic field could increase viscosity of melt and restrain natural convection; also induce Lorentz resistive force to reduce rising velocity and growth rate of second phase particles.

关 键 词：Cu-90%Pb合金 偏晶合金凝固 强磁场 重力偏析 洛伦兹力 

分 类 号：TG111.4[金属学及工艺—物理冶金] TG146.12[金属学及工艺—金属学]