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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 15    No. 1    February 2005

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Microstructure of alloy MlNi3.75Co0.75Mn0.3Al0.2(Ml—La-rich mischmetal) during electrochemical hydriding-dehydriding process
YUAN Zhi-qing(袁志庆)1, LÜ Guang-lie(吕光烈)1,
GU Jian-ming(顾建明)1, SHENG Xiao-fei(盛小飞)2

1. Central Laboratory, Zhejiang University, Hangzhou 310028, China;
2. Chemical Engineering Department, Zhejiang University of Technology,
Hangzhou 310014, China

Abstract:Evolution of microstructures of alloy MlNi3.75Co0.75Mn0.3Al0.2 (Ml—La-rich mischmetal) during the electrochemical hydriding-dehydriding process was studied by using in-situ X-ray diffraction method. It is indicated that both the crystallite sizes of α phase (solid solution phase) and β phase (hydride phase) decrease with the hydrogen content increasing during this process. β phase is found to be composed of the plate-like and the needle-like crystallites, while the crystallite size of the former changes more rapidly than that of the later during the hydriding-dehydriding process. It’s also clearly found that strains along (110) plane and (001) plane of α phase and β phase are higher in the α+β region than those in the corresponding single phase region. Based on the microstructural studies, mechanism for the hydride growth has also been proposed.

 

Key words: in-situ X-ray diffraction; crystallite size; hydrogen storage alloy; hydride

ISSN 1672-7029
CN 43-1423/U

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