Jinliang GaoYanghuan Zhang ;;;
. 2010, 41(08): 23-0.
Abstract (
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In order to improve the hydriding and dehydriding kinetics of the Mg2Ni-type alloys, Mg in the alloy was partially substituted by element La, and the Mg2Ni-type Mg2-xLaxNi (x = 0, 0.2, 0.4, 0.6) alloys were synthesized by melt spinning technique, and the thin ribbons with a continuous length, a thickness of about 30 μm and a wideness of 25 mm were obtained. The microstructures of the as-spun alloy ribbons were characterized by XRD, SEM and HRTEM. Thermal stability of the as-spun alloy ribbons was studied by DSC. The hydriding and dehydriding kinetics of the alloys were tested using an automatically controlled Sieverts apparatus. The effects of substituting Mg with La on the hydriding and dehydriding kinetics of the melt spun Mg2Ni-type alloys were investigated. The results show that there is no amorphous phase formed in the as-quenched La-free alloy, but the as-quenched alloys containing La holds a major amorphous phase. The substitution of La for Mg raises the glass forming ability of the Mg2Ni-type alloy and the crystallization temperature of the amorphous phase. The hydrogen absorption capacities of the as-spun alloys significantly decrease with rising the amount of La substitution, whereas x = 2, the as-spun alloy (x = 2) displays the largest hydrogen desorption capacity, which is mainly attributed to the modified structure by La substitution.