磁声波对金属凝固组织的影响  

EFFECT OF MAGNETO-ACOUSTIC WAVES ON SOLIDIFICATION STRUCTURES OF METAL

作　　者：王强[1] 赫冀成[1] 川合悟[2] 岩井一彦[2] 浅井滋生[2] 

机构地区：[1]东北大学材料电磁过程研究教育部重点实验室,沈阳110004 [2]名古屋大学工学研究科

出　　处：《金属学报》2002年第9期961-965,共5页Acta Metallurgica Sinica

基　　金：高等学校实验室访问学者基金;国家重点基础研究发展规划G1998061510资助项目

摘　　要：提出了运用强磁场和交流电流的共同作用直接在金属液中产生声波（磁声波）的新方法,并研究了所生成的磁声波在细化合金凝固组织晶粒的效果.该方法可以从根本上解决机械声波无法在高温生产领域应用的难题.理论解析表明,运用交变电磁力在液体金属内生成的磁声波的强度和所施加的静磁场的磁感应强度和交流电流的电流密度的乘积成正比;电磁力的频率越大,生成的磁声波越接近于由机械振动产生的声波.实验中测定的磁声波压力和理论解析结果基本一致.这种方法产生的磁声波具有促进金属凝固组织晶粒细化的作用.The simultaneous imposition of a high static magnetic field and an alternating electrical current was utilized to excite acoustic waves (magneto-acoustic waves) directly in a liquid metal instead of conventional mechanical vibration method. The effect of the generated waves on solidification structures was also examined. The theoretical analysis shows that the intensity of the generated waves is in proportion to the product of the imposed static magnetic field and alternating electrical current. And when the frequency of imposed alternating electromagnetic force increased, the characteristic of the generated waves becomes more similar to that of those excited by mechanical vibration. Pressure perturbations detected experimentally in liquid gallium appropriately agreed with the theoretical predictions. The generated magneto-acoustic waves improved solidified structures of Sn-Pb alloys. This study indicates a new method to generate acoustic waves by imposing alternating electromagnetic force locally on a metal, which can overcome the difficulties happened when the waves excited by mechanical vibration applied in high temperature environment.

关 键 词：金属 凝固组织 静磁场 磁声波 交变电磁力 凝固过程 

分 类 号：TG111.4[金属学及工艺—物理冶金] TG113.1[金属学及工艺—金属学]