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Chem. J. Chinese Universities ›› 2005, Vol. 26 ›› Issue (10): 1877.

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Preparation and Properties of Mg1.75Al0.25Ni1-xCrx(0 ≤x≤ 0.2) Alloys

WANG Mei-Han1, ZHANG Lian-Zhong1, SUN Li-Xian1, ZHANG Yao1, XU Fen1, TAN Zhi-Cheng1, YUAN Hua-Tang2, ZHANG Tao1   

  1. 1. Material and Thermochemistry Laboratory,Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023,China;
    2. Institute of New Energy Material Chemistry,Nankai University,Tianjin 300071,China
  • Received:2004-11-18 Online:2005-10-10 Published:2005-10-10

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Abstract: Mg1.75Al0.25Ni1-xCrx(0 ≤x≤ 0.2) alloys were synthesized by diffusing method(DM) on the basis of the ternary Mg1.75Al0.25Ni alloy.The X-ray diffraction showed that the structure of the Cr-partially-substituted alloy did not differ from that of Mg1.75Al0.25Ni alloy but there was a change in the lattice parameter.It was found that the Cr-substituted alloys showed enhanced discharge capacities.The cycle life of the alloys was(improved) when x(Cr) reached 0.1. The anti-corrosion order was Mg1.75Al0.25Ni0.9Cr0.1>Mg1.75Al0.25Ni>Mg1.75Al0.25Ni0.8Cr0.2>Mg2Ni.The result of the charge-discharge experiment also supported the conclusion.The structure and the component of alloy phase were changed after ball milling but the discharge capacity of the Mg1.75Al0.25Ni0.9Cr0.1 alloy was not enhanced.

Key words: Mg-based hydrogen storage alloys, Elements substitution, Electrode materials

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