The Mg-Ni hydrogen storage alloys were prepared using the laser sintering technology.The effects of laser sintering power on the phase component and the weight loss of Mg element for the Mg-Ni alloys were investigated.The samples P1,P2 and P3 consisted of five phases:Mg2Ni,MgNi2,Mg,Ni and MgO.The weight loss of Mg element remarkably increased at 1200 W.The addition of extra Mg significantly promoted the reaction between Mg and Ni.Mg2Ni,MgNi2,and a small amount of Ni and MgO phases were present in the samples PM (pestle milling) and BM (ball milling).The sample PM has a homogeneous microstructure,and the contents of Mg2Ni and MgNi2 were approximately consistent with those of the Mg-Ni alloy under the equilibrium conditions.The maximum hydrogen storage capacity of the sample BM was 1.72 wt.% and the sample can be activated easily at 573 K (only 3 activation cycles).
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