TEXTURE GROWTH CHARACTERIZATION IN RARE EARTH HYDROGEN STORAGE ALLOYS
来源期刊：中国有色金属学报(英文版)1999年第2期
论文作者：Wang Chaoqun Wang Ning Jin Hongmei Li Guoxun
文章页码：297 - 301
Key words：rare earth hydrogen, storage alloy ,texture, rapid solidification, capacity ,cycle life
Abstract: By using X-ray diffraction technique and electrochemical measurements, the texture growth and its effects on the electrochemical properties have been explored under various cooling rates in rare-earth hydrogen storage alloys. It was shown that: (1) the different texture growth characters were obtained in the rare earth hydrogen storage alloys with various compositions under conventional fast cooling and a columnar structure was formed so that thec-axis of the hexagonal structure was oriented parallel to the cooling plane and a higher capacity was attained; (2) the alloy prepared from rapid solidification exhibits a strong (0002) based pole texture in the surface of alloy sheet, i.e.c-axis texture. Its crytal growth character is consistent well with the alloy MmNi3.5Co0.7Al0.8 which has a columnar structure with very high endurance, and low lattice strain was obtained under controlled conditions including high rate cooling in the casting process for obtaining a columnar structure.
