| Thixotropic AZ91HP Mg alloy was only focused on aspect of semi liquid forming until now. In this study, for the purpose of proposition as economic lightweight hydrogen absorbing materials, the hydrogenation properties of thixotropic AZ91HP Mg alloy were evaluated by automatic Sieverts type pressure-composition-isotherm(PCI) apparatus. By the results of experiments, α-Mg rich phase(like solid phase) was regarded the storage system as an hydrogen absorbing / desorbing and eutectic phase (like liquid phase), Mg_(17)Al_(12)/Mg-Al-Zn, was considered to be the catalytic system as an improving factor of hydrogenation kinetics. Especially, the hydrogenation properties were dependent on the purity and size of α-Mg rich phase. In the case of 863, 868K specimens(4hr crushing under 2 ㎫ hydrogen atmosphere), liquid fraction was about 50-60% and the hydrogen capacity was reached about 4.5 wt% at 623K. |
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