摘要
A self-made directional solidification device was used to fabricate d 80 mm high purity aluminum ingots. SEM and AFM were used to detect the shape of grain boundaries. The orientation of the grain was studied by X-ray diffractometry. The results show that the nucleation points locate at the intersections of three adjacent grains. The lattice orientation of grains does not alter in the horizontal direction, but gradually approaches the optimum growth direction in the vertical direction during the growth process. All the grains suffer the competition and only the one whose orientation is closest to the preferred direction can occupy the final growth space.
A self-made directional solidification device was used to fabricate d80 mm high purity aluminum ingots, SEM and AFM were used to detect the shape of grain boundaries. The orientation of the grain was studied by X-ray diffractometry. The results show that the nucleation points locate at the intersections of three adjacent grains. The lattice orientation of grains does not alter in the horizontal direction, but gradually approaches the optimum growth direction in the vertical direction during the growth process. All the grains suffer the competition and only the one whose orientation is closest to the preferred direction can occupy the final growth space.
出处
《中国有色金属学会会刊：英文版》
EI
CSCD
2006年第1期1-7,共7页
Transactions of Nonferrous Metals Society of China
基金
Project(2002AA6070) supported by the Hi-tech Research and Development Program of China
关键词
高纯铝
电磁搅拌
定向凝固
形核
生长
high purity aluminum
directional solidification
grain nucleation
lattice orientation
competitive growth
