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中文摘要：
为了改善Mg2Ni型合金的吸放氢动力学性能,用Co部分替代合金中的Ni。用快淬工艺制备了纳米晶和非晶Mg20Ni10-xCox（x=0,1,2,3,4）贮氢合金,分析了铸态及快淬态合金的微观结构,测试了合金的吸放氢动力学性能。研究了Co替代Ni及快淬工艺对合金吸放氢动力学性能的影响。结果表明,在快淬合金（x=0）中没有发现非晶相,但快淬合金（x=4）显示了纳米晶/非晶结构,表明Co替代Ni提高了Mg2Ni型合金的非晶形成能力。Co替代Ni不改变合金的Mg2Ni主相,但形成了第二相MgCo2。随Co替代量的增加,合金的吸氢量先增加而后减少,但其放氢量随Co替代量的增加而单调增加。
英文摘要：
In order to improve the hydriding and dehydriding kinetics of the Mg2Ni-type alloy,Ni in the alloy was partially substituted by element Co.The nanocrystalline/amorphous Mg20Ni10-xCox（x=0,1,2,3,4） alloys were prepared by melt-spinning technology.The structures of the as-cast and spun alloys were analyzed.The hydriding and dehydriding kinetics of the alloys were measured.The influences of substituting Ni with Co and melt spinning on the hydriding and dehydriding kinetics of the alloys were investigated.The results show that no amorphous phase formed in the as-spun （x=0） alloy,but the as-spun （x=4） alloy shows nanocrystalline and amorphous structure,indicating that the substitution of Co for Ni enhances the glass forming ability of Mg2Ni-type alloy.The substitution of Co for Ni did not change the major phase of Mg2Ni in the alloy,but it led to secondary phase MgCo2 formed.The hydrogen absorption capacity of the alloys first increases and then decreases with rising Co content,but the hydrogen desorption capacity of the alloys monotonously grows with increasing Co content.
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