La_2O_3对Al-TiO_2-C细化剂组织及细化性能的影响  

Effect of La_2O_3 on microstructure and refining performance of the Al-TiO_2-C refiners

作　　者：韩小伟[1] 张瑞英[1,2] 李艳辉[1] 王鹏[1] 

机构地区：[1]内蒙古工业大学材料科学与工程学院,内蒙古呼和浩特010051 [2]内蒙古轻合金重点实验室,内蒙古呼和浩特010051

出　　处：《材料热处理学报》2015年第8期28-33,共6页Transactions of Materials and Heat Treatment

基　　金：内蒙古自然科学基金(2013MS0804);内蒙古高等学校科学研究基金(NJZZ14056)

摘　　要：以TiO2粉、C粉、Al粉和La2O3粉为原料,利用放热弥散法原位合成稀土La2O3含量分别为0,0.1%,0.2%,0.3%(质量分数)的Al-TiO2-C晶粒细化剂,并使用这4种细化剂分别对工业纯铝进行细化试验。采用XRD、SEM及能谱分析等方法研究了La2O3含量对Al-TiO2-C细化剂显微组织的影响。结果表明:La2O3含量为0.2%时,Al-TiO2-C晶粒细化剂组织中Al3Ti呈块状分布,彼此间断开且颗粒分布相对均匀。此时对工业纯铝的细化效果相对较好。适量的Al20Ti2La对提高Al-TiO2-C细化剂细化性能起到重要作用。A1-TiO2-C grain refiners were synthesized by the in-situ exothermic dispersion method using TiO2, C, A1 and La2O3 powders as raw materials. The content of La2O3 in the refiners is 0, 0. 1% , 0. 2% , 0.3% , respectively. In the grain refiner performance test, the four composition refiners were added to industrial pure aluminum. The effects of La2O3 on the microstructure of A1-TiO2-C refiners were investigated by SEM, XRD and EDS analysis. The results show that the optimal La2O3 content in the refiners is 0.2% , in which the massive and disconnected Al3 Ti particles are uniformly distributed. A better refining effect of the refiner with 0.2% La2O3 on industrial pure aluminum is observed, and an amount of A120Ti2La plays an important role in improving the performance of AI-TiO2-C grain refiner.

关 键 词：放热弥散法 Al-TiO2-C 晶粒细化 

分 类 号：TB331[一般工业技术—材料科学与工程] TG146.21[金属学及工艺—金属材料]