Nd含量对快淬纳米晶和非晶（Mg24Ni10Cu2）100-xNdx（x=0~20）合金电化学性能的影响

摘要

采用快淬技术制备Mg2Ni型纳米晶和非晶(Mg24Ni10Cu2)100-xNdx (x=0,5,10,15,20)合金，研究快淬速度对合金相结构和电化学性能的影响。结果表明，快淬态无 Nd 合金为纳米晶结构，而添加 Nd 元素的快淬态合金为纳米晶和非晶结构，表明添加Nd元素可促进Mg2Ni型合金的非晶形成能力。当快淬速度从0增加至40 m/s时， x=0合金的放电容量从42.5增加至100.6 mA·h/g；x=10合金的放电容量从86.4增加至452.8 mA·h/g。与此同时， x=0合金的循环稳定性(S20)也由40.2%增加到41.1%，而x=10合金的S20值由53.2%增加到89.7%。%The nanocrystalline and amorphous Mg2Ni-type alloys with a chemical composition of (Mg24Ni10Cu2)100-xNdx (x=0, 5, 10, 15, 20) were fabricated by melt spinning technology. The effects of spinning rate on the structure and electrochemical hydrogen storage performance of the alloys were investigated. The as-spun Nd-free alloy displays an entire nanocrystalline structure, whereas the as-spun Nd-added alloys hold a nanocrystalline and amorphous structure, suggesting that the addition of Nd facilitates the glass forming of the Mg2Ni-type alloys. Increasing the spinning rate from 0 to 40 m/s gives rise to the discharge capacity growing from 42.5 to 100.6 mA·h/g for the x=0 alloy and from 86.4 to 452.8 mA·h/g for the x=10 alloy. And the cycle stability (S20) rises from 40.2%to 41.1%for the x=0 alloy and from 53.2%to 89.7%for the x=10 alloy, respectively.