强磁场对不同磁化率非磁性金属凝固组织的影响  

EFFECT OF INTENSE MAGNETIC FIELDS ON SOLIDIFIED STRUCTURES OF NON-MAGNETIC METALS WITH VARIOUS SUSCEPTIBILITIES

作　　者：王强[1] 王春江[1] 王恩刚[1] 赫冀成[1] 高桥弘纪[2] 渡辺和雄[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]日本东北大学金属材料研究所

出　　处：《金属学报》2005年第2期128-132,共5页Acta Metallurgica Sinica

基　　金：国家自然科学基金项目50204004国家重点基础研究发展规划项目G1998061510国家自然科学基金和上海宝钢集团公司联合项目50374027资助

摘　　要：根据热力学分析,强磁场对晶体凝固过程均质形核的影响是通过改变熔点、系统Gibbs自由能,从而促进或抑制形核过程来实现的.实验研究表明,相同的磁场条件对不同磁性金属凝固组织的细化作用、取向作用效果是不同的,从磁能、Lorentz力和磁化力效果等热力学和动力学角度探讨了相关规律.强磁场可以改变金属材料的凝固组织,从而进一步改善材料的质量和性能.The effects of intense magnetic fields on homogeneous nucleation are theoretically discussed from thermodynamics viewpoint. The results show that the magnetic fields can promote or retrain nucleus formation through changing the equilibrium temperature of the metal and Gibbs free energy of the system. The experiments are carried out in which intense magnetic fields are imposed on metals with different magnetic permeabilities during their solidification processes. It is found that the roles of intense magnetic fields such as refining solidified structures and orientating crystals are not similar for different metals. The mechanisms of these phenomena could be explained appropriately according to the influences of magnetic energy, Lorentz force or magnetization force. It is concluded that using intense magnetic fields can change the solidified structures of metals and then improve the quality and properties of materials accordingly.

关 键 词：材料电磁过程 强磁场 对流控制 凝固组织 冶金过程 

分 类 号：TG249.9[金属学及工艺—铸造] TF19[冶金工程—冶金物理化学]