Microstructure and phase forming process of Al-3Ti-0.2C-1RE grain refiner  

作　　者：赵红亮 管仁国 李苗 岳金胜 高雅 

机构地区：[1]College of Materials Science and Engineering,Zhengzhou University [2]School of Materials and Metallurgy,Northeastern University

出　　处：《Journal of Central South University》2014年第1期1-8,共8页中南大学学报（英文版）

基　　金：Project(51174177)supported by the National Natural Science Foundation of China

摘　　要：An Al-3Ti-0.2C-1RE grain refiner was prepared by in-situ reaction method.The microstructure was investigated by optical microscopy(OM),scanning electron microscopy(SEM) equipped with energy-dispersive spectrometry(EDS) and X-ray diffraction(XRD).The results show that the Al-3Ti-0.2C-1RE grain refiner is composed of α-Al,TiAl3,TiC and Ti2 Al20 Ce phases.Compared with Al-3Ti-0.2C refiner,the morphology of TiAl3 phase is changed and Ti2 Al20 Ce phases form with the addition of RE.Accordingly,the refining performance is improved.The phase forming process of the refiner is as follows: Blocky Ti2 Al20 Ce and fine blocky TiAl3 form in the melt at the initial stage of reaction,then the fine blocky TiAl3 gradually disappears,and the blocky Ti2 Al20 Ce grows bigger with the increase of holding time.The predominant mechanism to synthesize TiC particles is the reaction between high concentration of solute Ti atoms and graphite particles.An Al-3Ti-0.2C-1RE grain refiner was prepared by in-situ reaction method. The microstructure was investigated by optical microscopy （OM）, scanning electron microscopy （SEM） equipped with energy-dispersive spectrometry （EDS） and X-ray diffraction （XRD）. The results show that the Al-3Ti-0.2C-1RE grain refiner is composed of α-Al, TiAl3, TiC and Ti2Al20Ce phases. Compared with Al-3Ti-0.2C refiner, the morphology of TiAl3 phase is changed and Ti2Al20Ce phases form with the addition of RE. Accordingly, the refining performance is improved. The phase forming process of the refiner is as follows： Blocky Ti2Al20Ce and fine blocky TiAl3 form in the melt at the initial stage of reaction, then the fine blocky TiAl3 gradually disappears, and the blocky Ti2Al20Ce grows bigger with the increase of holding time. The predominant mechanism to synthesize TiC particles is the reaction between high concentration of solute Ti atoms and graphite particles.

关 键 词：rare earth alloys and compounds grain refiner MICROSTRUCTURE METALLOGRAPHY 

分 类 号：O611.4[理学—无机化学]