In-situ X-ray diffraction study on MlNi3.75Co0.75Mn0.3Al0.2during electrochemical hydriding-dehydriding process①
来源期刊：中国有色金属学报(英文版)2004年第2期
论文作者：袁志庆 吕光烈 顾建明 屠小燕 王新喜
文章页码：232 - 236
Key words：in-situ X-ray diffraction; phase transformation; lattice expansion; intermetallic alloys; hydrides
Abstract: Phase transformations and lattice expansions of MlNi3.75Co0.75Mn0.3Al0.2 during the electrochemical hydriding-dehydriding process were investigated using in-situ X-ray diffraction. An intermediate hydride γ phase between the hydrogen solid solutionαphase and fully hydrided β phase can be observed during the cycling. The formation of γ phase is related to the diffusion of hydrogen in the crystal grains. The lower the charge rate is, the higher the content of γ phase is. The phase transformations during the hydriding-dehydriding process can be described as α=α+γ+β=β=γ+α=α. The lattice expansion fromαto β is discrete, while that from γ to β is continuous. The formation of γ phase can reduce the discrete lattice expansion from α to β by 30%.
