Study of the Hydrogen Storage Properties of Magnesium-containing MgxTiVNiAlCr High Entropy Alloy
Author of the article:SHEN Bingze;FAN Jianfeng;GUO Huijun
Author's Workplace:Key Laboratory of Interface Science and Engineering in Advanced Materials Ministry of Education,Taiyuan University of Technology,Taiyuan 030000,China
Key Words:high entropy alloys hydrogen storage properties kinetic enthalpy of formation
Abstract: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.