纳米晶-非晶Mg<sub>2</sub>Ni型合金的贮氢动力学

doi:10.11901/1005.3093.2014.114

材料研究学报

2014, Vol. 28

Issue (11): 873-880 DOI: 10.11901/1005.3093.2014.114

本期目录 | 过刊浏览

纳米晶-非晶Mg₂Ni型合金的贮氢动力学

张羊换^1,²(

),袁泽明²,翟亭亭²,杨泰²,张国芳¹,赵栋梁²

1. 内蒙古科技大学内蒙古自治区白云鄂博矿多金属资源综合利用重点实验室包头 014010
2. 钢铁研究总院功能材料研究所北京 100081

Hydrogen Storage Kinetics of Nanocrystalline and Amorphous Mg₂Ni-type Alloys

Yanghuan ZHANG^1,^2,^**(

),Zeming YUAN²,Tingting ZHAI²,Tai YANG²,Guofang ZHANG¹,Dongliang ZHAO²

1. Key Laboratory of Integrated Exploitation of Baiyun Obo Multi-Metal Resources, Inner Mongolia University of Science and Technology, Baotou 014010
2. Department of Functional Material Research, Central Iron and Steel Research Institute, Beijing 100081

引用本文:

张羊换,袁泽明,翟亭亭,杨泰,张国芳,赵栋梁. 纳米晶-非晶Mg₂Ni型合金的贮氢动力学[J]. 材料研究学报, 2014, 28(11): 873-880.
Yanghuan ZHANG, Zeming YUAN, Tingting ZHAI, Tai YANG, Guofang ZHANG, Dongliang ZHAO. Hydrogen Storage Kinetics of Nanocrystalline and Amorphous Mg₂Ni-type Alloys[J]. Chinese Journal of Materials Research, 2014, 28(11): 873-880.

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摘要:

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-_xNd_x(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 NdNi。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(I_L), 同时增大了电荷转移阻抗(R_ct)。

关键词 ：金属材料, Mg₂Ni型合金, 快淬, 添加Nd, 贮氢动力学

Abstract：

A series (Mg₂₄Ni₁₀Cu₂)_100-_xNd_x(x = 0, 5, 10, 15, 20) alloys with a microstructure of nanocrystalline and amorphous structure were prepared by melt spinning technology. The effect of spinning rate and Nd content on the microstructure and the hydrogen storage performance of the alloys was investigated. The results of XRD and TEM examination reveal that all the as-cast alloys exhibit a multiphase microstructure, i.e. Mg₂Ni-type phase is the major component and there exist several secondary phases such as Mg₆Ni, Nd₅Mg₄₁ and NdNi. Furthermore, the as-spun Nd-free alloy shows a microstructure of entire nanocrystallines, whereas the as-spun alloys with Nd addition exhibit a microstructure of nanocrystalline and amorphous structure, meaning that the addition of Nd facilitates the glass forming of the alloys. The measurement of the hydrogen storage kinetics indicates that the melt spinning and the Nd addition can significantly improve the hydrogen storage performance of the alloys either in gaseous atmosphere or by electrochemically charging, and with the increasing spin rate and the amount of Nd addition, the high rate discharge capability (HRD) of the alloys increases firstly and then declines, for which the enhanced hydrogen diffusion coefficient (D) and limiting current density (I_L) and the increased charge transfer resistance (R_ct) resulted from both the melt spinning and the Nd addition are possibly responsible.

Key words： metallic materials Mg₂Ni-type alloy melt spinning Nd addition hydrogen storage kinetics

收稿日期: 2014-03-10

基金资助:* 国家自然科学基金51161015, 51371094和内蒙古自治区自然科学基金重大项目2011ZD10资助。

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图1 铸态及快淬态(Mg24Ni10Cu2)100-xNdx (x = 0-20)合金的XRD谱

图2 快淬态(Mg24Ni10Cu2)100-xNdx (x = 0-20)合金的TEM形貌及电子衍射环(ED)

图3 快淬态(Mg24Ni10Cu2)100-xNdx (x = 0-20)合金的DSC曲线

图4 铸态及快淬态(Mg24Ni10Cu2)100-xNdx (x = 0-20)合金的R5a 、C100a 值与淬速及Nd含量的关系

图5 铸态及快淬态(Mg24Ni10Cu2)100-xNdx (x = 0-20)合金的R10d 、C10d 值与淬速及Nd含量的关系

图6 铸态及快淬态(Mg24Ni10Cu2)100-xNdx (x = 0-20)合金的高倍率放电能力

图7 在50%(DOD)放电深度下(Mg24Ni10Cu2)100-xNdx (x = 0-20)合金的交流阻抗谱

图8 铸态及快淬态(Mg24Ni10Cu2)100-xNdx (x = 0-20)合金的阳极电流与时间相应曲线

图9 在50%放电深度下铸态及快淬态(Mg24Ni10Cu2)100-xNdx (x = 0-20)合金的Tafel极化曲线

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