为了改善Mg2Ni型合金的吸放氢动力学性能,用Cu部分替代合金中的Ni.用快淬工艺制备了纳米晶Mg2Ni1-xCux(x=0,0.1,0.2,0.3,0.4)贮氢合金,用XRD、SEM、HRTEM分析了铸态及快淬态合金的微观结构;用自动控制的Sieverts设备测试了合金的吸放氢动力学性能.结果表明,快淬态合金具有纳米晶结构,Cu替代Ni不改变合金的主相Mg2Ni,但导致形成第二相Mg2Cu.随Cu含量的增加,合金的吸氢量先增加而后减小,但合金的放氢量随Cu含量的增加而单调增加.快淬显著提高合金的吸放氢量并改善合金的吸放氢动力学.
In order to improve the hydriding and dehydriding kinetics of the Mg2Ni-type alloy,Ni in the alloy was partially substituted by element Cu.The nanocrystalline Mg2Nil-xCux (x＝0,0.1,0.2,0.3,0,4) alloys were prepared by melt-spinning technology,The structures of the as-cast and spun alloys were analyzed by XRD,SEM and HRTEM.The hydriding and dehydriding kinetics of the alloys were measured by using an automatically controlled Sieverts apparatus.The results show that all the as-spun alloys hold a nanocrystalline structure.The substitution of Cu for Ni leads to form secondary phase Mg2Cu without changing of the major phase of Mg2Ni in the alloy,The hydrogen absorption capacity of the alloys first increases and then decreases with rising of Cu content,but the hydrogen desorption capacity of the alloys monotonously grows with increasing of Cu content.The melt spinning significantly improves the hydrogenation and dehydrogenation capacity and the kinetics of the alloys.
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