Microstructure and phase forming process of Al-3Ti-0.2C-1RE grain refiner
来源期刊：中南大学学报(英文版)2014年第1期
论文作者：ZHAO Hong-liang(赵红亮) GUAN Ren-guo(管仁国) LI Miao(李苗) YUE Jin-sheng(岳金胜) GAO Ya(高雅)
文章页码：1 - 8
Key words：rare earth alloys and compounds; grain refiner; microstructure; metallography
Abstract: 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.
ZHAO Hong-liang(赵红亮)1, GUAN Ren-guo(管仁国)2, LI Miao(李苗)1, YUE Jin-sheng(岳金胜)1, GAO Ya(高雅)1
(1. College of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450002, China;
2. School of Materials and Metallurgy, Northeastern University, Shenyang 110004, China)
Abstract: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.
Key words:rare earth alloys and compounds; grain refiner; microstructure; metallography
