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在合金中添加Cu及Nd,用真空快淬技术制备纳米晶-非晶Mg2Ni型(Mg24Ni10Cu2)100-xNdx(x=0,5,10,15,20)合金,研究了淬速及Nd含量对合金结构及贮氢动力学性能的影响。XRD及TEM分析结果表明,铸态合金具有多相结构,包括主相Mg2Ni和第二相Nd5Mg41、Mg6Ni和Nd Ni。快淬无Nd合金具有完全的纳米晶结构,而含Nd合金则具有纳米晶-非晶结构,表明添加Nd提高了合金的非晶形成能力。贮氢动力学测试结果表明,快淬和添加Nd显著提高了合金的气态及电化学贮氢动力学。合金的高倍率放电能力(HRD)随着淬速和Nd含量的增加先增加而后减小,这主要归因于快淬及添加Nd显著提高了合金的氢扩散系数(D)和极限电流密度(IL),同时增大了电荷转移阻抗(Rct)。
The addition of Cu and Nd to the alloy prepared by vacuum quenching technology nanocrystalline - amorphous Mg2Ni (Mg24Ni10Cu2) 100-xNdx (x = 0,5,10,15,20) alloy was studied quenching and Nd content of Alloy Structure and Hydrogen Storage Dynamics. The results of XRD and TEM show that the as-cast alloy has a multiphase structure including the main phase Mg2Ni and the second phases Nd5Mg41, Mg6Ni and NdNi. The quenched Nd-free alloy has a completely nanocrystalline structure, while the Nd-containing alloy has a nanocrystalline-amorphous structure, indicating that the addition of Nd improves the amorphous formation ability of the alloy. Hydrogen storage kinetics test results show that quenching and Nd addition significantly improve the gas and electrochemical hydrogen storage kinetics of the alloy. The high rate discharge (HRD) of the alloy first increases and then decreases with the increase of quenching rate and Nd content, which is mainly attributed to the hydrogen diffusion coefficient (D) and limiting current density IL) while increasing the charge transfer resistance (Rct).