强磁场下熔体中晶粒旋转取向机制及其影响因素  

Study on the Mechanism and Influencing Factors of Rotational Orientation of Crystals in Melt Under a High Magnetic Field

作　　者：娄长胜[1,2] 王强 王春江[2] 苑轶[2] 李文[1] 赫冀成[2] 

机构地区：[1]沈阳理工大学材料科学与工程学院,辽宁沈阳110159 [2]东北大学材料电磁过程研究教育部重点实验室,辽宁沈阳110819

出　　处：《兵工学报》2013年第7期858-864,共7页Acta Armamentarii

基　　金：国家自然科学基金项目(51006020;51174056);"973"计划前期研究专项(2011CB612206);新世纪优秀人才支持计划项目(NECT-06-0289)

摘　　要：对强磁场下金属熔体中的第二相晶粒发生旋转取向的机制进行了分析,给出了热力学判据和动力学运动规律。体系温度、重力和第二相自身的形状是影响旋转取向发生和进程的重要因素,分别对其进行了分析。理论分析和实验结果表明:熔体中第二相的旋转运动是合力矩的作用结果;体系温度和重力决定第二相发生旋转取向的临界尺寸;形状因素影响取向的时间。在强磁场下可以利用物质内禀磁性的差异,通过改变上述的影响因素制备出具有取向一致的金属基复合材料。The rotating mechanism of second phase particles in melt under the action of high static mag- netic fields is analyzed, and the thermodynamic criterion and the law of rotational motion are given. Some important factors, such as temperature, gravity and particle shape, which play key role in the rotation of the second phase are clarified in detail. The results of theoretical analysis and experiments show that the rotational movement of the second phase is attributed to the resultant movement, the critical sizes of the second phase particles depend on temperature and gravity, and the shapes of the second phase particles have an effect on the orienting time. It can be concluded the high oriented metal-matrix composite can be fabricated under the action of an appropriate high static magnetic field by altering the factor mentioned above based on the differnce of intrinsic magnetic susceptibility of matters.

关 键 词：金属材料 强磁场 熔体 第二相 磁取向 凝固组织 

分 类 号：TG111.3[金属学及工艺—物理冶金]