Effect of Ternary Element Addition on Hydrogen Absorption and Desorption Properties of Amorphous Zr_<50>Ni_<50> Alloy

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The hydrogen absorption and desorption properties of the amorphous Zr_<50>Ni_<40>T_<M10> (TM=Ti, V, Cr, Mn and Fe) and Zr_<50-x>T_<M_x>Ni_<50> (TM=Ti, Hf, V, Nb and Ta) alloys were investigated by a volumetric method. Their crystallization temperature were also measured by using DTA. The amount of hydrogen absorbed in the amorphous Zr_<50>Ni_<40>T_<M10> alloys increases significantly by addition of the hydride forming elements (Ti and V), while the amount of desorbed hydrogen decreases by all additive elements. For amorphous Zr_<50-x>T_<M_x>Ni_<50> alloys, the hydrogen capacity of the alloys substituted by IVa group elements (Ti and Hf) shows a little composition dependence, while that of the alloys substituted by Va group elements (V, Nb and Ta) decreases largely up to about 20 at% and then increases. The amounts of desorbed hydrogen for these alloys decreases with T_M content except for the alloy substituted by Hf.
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