稀土学报（英文版）
稀土學報（英文版）
희토학보（영문판）
JOURNAL OF RARE EARTHS
2015年
5期
553-560
,共8页
徐聪%肖文龙%赵卫涛%王文红%花田修治%山县裕%马朝利
徐聰%肖文龍%趙衛濤%王文紅%花田脩治%山縣裕%馬朝利
서총%초문룡%조위도%왕문홍%화전수치%산현유%마조리
Al-Ti-C-RE%core-shell structure%grain refinement%formation mechanism%rare earths
The Al-5Ti-0.2C-based grain refiners with different contents of rare earth (RE) were successfully prepared via powder metallurgy and vacuum casting. The microstructural evolution has been studied by X-ray diffraction (XRD), differential scanning calorimetry (DSC), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results showed that the RE addition resulted in the formation of TiAl3/Ti2Al20RE core-shell structured primary particles, and the size of TiAl3 core decreased, while the thickness of Ti2Al20RE increased with increase of RE contents. As compared to Al-5Ti-0.2C grain refiner, the grain refining efficiency was gradually improved with increase of RE contents, which was mainly attributed to the TiAl3/Ti2Al20RE core-shell structured primary particles and insoluble TiC nuclei formed inα-Al matrix. The formation mechanism of core-shell structure was further investigated based on Ginstling-Brounstein model.
