颗粒增强铝基复合材料的电磁连铸研究  

Research on Electromagnetic Continuous Casting of Particle-reinforced Aluminum Matrix Composites

作　　者：王宏明[1] 任忠鸣[2] 李桂荣[1] 戴起勋[1] 赵玉涛[1] 李家旺[1] 

机构地区：[1]江苏大学材料科学与工程学院,江苏镇江212013 [2]上海大学上海市钢铁冶金重点实验室,上海200072

出　　处：《铸造技术》2005年第3期199-201,共3页Foundry Technology

基　　金：国家自然科学基金项目(50471050; 50474037);江苏省高校自然科学基金项目(04BJK430022)

摘　　要：用原位反应合成法制备(Al2O3+Al3Zr)p/Al颗粒增强铝基复合材料,在半连铸过程施加低频交变电磁场进行搅拌,改善增强颗粒在基体内的分布状态,并在结晶器初始凝固区域施加高频电磁场实现软接触连铸以改善铸坯的表面质量。SEM分析显示:施加电磁搅拌后凝固组织致密,颗粒增强相的数量增加,颗粒细化、分布趋于均匀.施加的高频磁场使得单纯使用电磁搅拌产生的表面粗糙现象消失,铸坯表面质量显著改善.(Al2O3 + Al3Zr)p/Al composites have been prepared via in-situ synthetic reaction. During the semi-continuous casting process, a low frequency electromagnetic field is employed to improve the distribution state of reinforced particles by electromagnetic stirring (EMS). At the same time, a high frequency electromagnetic field is applied at the initial solidification region to realize the soft-contact state between the billet and the mold, so as to improve the surface quality. SEM analysis indicates that after being stirred by electromagnetic the microstructure got compact, the amount of reinforced phase is increased, and the grain is fined and distributed uniformly. Furthermore, the problem of billets surface coarseness caused by EMS is solved and the surface quality is improved remarkably via employing the high frequency electromagnetic field.

关 键 词：颗粒增强 复合材料 电磁连铸 软接触 

分 类 号：TG249.7[金属学及工艺—铸造] TB331[一般工业技术—材料科学与工程]