TiO_2含量对Al-TiO_2-C细化剂组织及细化效果的影响  

Microstructure and Refining Performance of Al-TiO_2-C Refiners with Different TiO_2 Contents

作　　者：韩小伟[1] 张瑞英[1,2] 王鹏[1] 李艳辉[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：《稀有金属》2016年第12期1226-1232,共7页Chinese Journal of Rare Metals

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

摘　　要：以TiO_2粉、C粉、Al粉为原料,采用放热弥散法制备Al-TiO_2-C晶粒细化剂,并进行晶粒细化试验。采用X射线衍射仪(XRD)、扫描电子显微镜(SEM)及能谱分析(EDS)等方法研究了不同TiO_2含量细化剂的显微组织。结果表明,Al-TiO_2-C晶粒细化剂由α-Al,Al_3Ti,Al_2O_3和Ti C相组成。TiO_2含量不同,Al-TiO_2-C晶粒细化剂内第二相形貌及分布也不同。当TiO_2含量为12%(质量分数)时,细化剂组织中Al_3Ti内包裹有大量的Al2O3和Ti C颗粒,这些颗粒将Al_3Ti分割开来,Al_3Ti相呈现圆块状,此时组织相对分布均匀。TiO_2含量不同,AlTiO_2-C晶粒细化剂对工业纯铝的细化效果也不同。随着TiO_2含量的增加,Al-TiO_2-C细化剂对工业纯铝的细化效果呈现先变好后变差的变化趋势,其中当TiO_2含量为12%时,其细化效果达到相对最好。本文细化剂的最佳添加量为0.3%。当细化剂中TiO_2含量为12%时,0.3%的细化剂添加量可使工业纯铝细化到约154μm。The Al-TiO2-C refiners were synthesized by the in-situ exothermic dispersion method using TiO2, C and Al powders as raw materials. The microstrueture of Al-TiO2-C refiners with different TiO2 contents was investigated by X-ray diffraction （XRD） , scanning electron microscope （SEM） and energy dispersive spectrometer （EDS）. The results showed that Al-TiO2-C refiners were composed of α-Al, Al3Ti, Al2O3 and TiC. Morphology and distribution of second phases were different as TiO2 content in Al-TiO2-C refiners in- creasing. When the content of TiO2 was 12% （ mass fraction） , Al3Ti was wrapped in a large number of Al2O3 and TiC particles, Al3Ti was separated from each other by the particles, Al3Ti was massive and the microstructure was distributed uniformly. The effect of Al- Ti02-C refiners on industrial pure aluminum was different as TiO2 content increasing. Refining performance of Al-TiO2-C refiners became better at first, and was the best when the content of TiO2 was 12% , then it became poor. The optimum addition level of Al-TiO2- C refiners was 0. 3%. An excellent grain refining performance was obtained when adding 0.3% Al-TiO2-C refiner with TiO2 content of 12% , and the average grain size was about 154μm.

关 键 词：放热弥散法 AL-TI O2-C晶粒细化剂 显微组织 晶粒细化 

分 类 号：TB331[一般工业技术—材料科学与工程]