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含镁高熵合金MgxTiVNiAlCr储氢性能的研究
Study of the Hydrogen Storage Properties of Magnesium-containing MgxTiVNiAlCr High Entropy Alloy
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- DOI:
- 作者:
- 申炳泽 樊建锋 郭卉君
SHEN Bingze;FAN Jianfeng;GUO Huijun
- 作者单位:
- 太原理工大学新材料界面科学与工程教育部重点实验室
Key Laboratory of Interface Science and Engineering in Advanced Materials Ministry of Education,Taiyuan University of Technology,Taiyuan 030000,China
- 关键词:
- 高熵合金 储氢性能 动力学 生成焓
high entropy alloys hydrogen storage properties kinetic enthalpy of formation
- 摘要:
- 通过高能球磨制备了一系列新型含镁高熵合金(HEA)MgxTiVNiAlCr(x=0,0.5,1)并系统研究了其吸放氢性能。采用X射线衍射(XRD)研究了合金的点阵结构,表明该系列合金在吸氢前后均是以体心立方(bcc)以及C14 Laves相为主的简单相结构。在储氢性能方面,Mg含量的变化对其动力学的影响主要通过不同温度条件下达到90%的最大吸氢量所需时间(t0.9)的变化表示。而其热力学则通过镁含量对压力-成分-温度(P-C-T)曲线的平台压及氢化物的生成焓(ΔH)的影响来阐明。含镁HEA的最大吸氢量与生成焓之间相互存在影响,且Mg等大原子半径元素对HEAs的储氢性能有所改善。
A series of new magnesium-containing high entropy alloys(HEA)MgxTiVNiAlCr(x=0,0.5,1)were synthesized by high energy ball milling and their hydrogen absorption and desorption properties were systematically investigated.The structure of the alloys was investigated by X-ray diffraction(XRD).In terms of hydrogen storage performance,the effect of the variation of Mg content on the kinetics of MgxTiVNiAlCr HE As were mainly shown in the variation of the time required to reach 90%of the maximum hydrogen absorption amount at different temperature conditions(t0.9).Its thermodynamics was elucidated by the effect of magnesium content on the plateau pressure of the pressure-composition-temperature(P-C-T)curve and the enthalpy of formation(AH)of hydride.The results show that the series alloys have a simple phase structure dominated by body-centered cubic(bcc)and C14 Laves phases before and after hydrogen absorption.The maximum hydrogen absorption capacity and formation enthalpy of HEA containing magnesium are influenced by each other,and the hydrogen storage performance of HEAS is improved by elements with large atomic radius such as Mg.