Study on microstructure and hydrogen storage performance of TiVCrNb high entropy alloy
In order to explore the microstructure and hydrogen storage performance of TiVCrNb high entropy alloy,vacuum arc melting technology was used to prepare TiVCrNb high entropy alloy.The results show that the alloy consists of BCC structural phase,FCC structural phase and C15 Laves phase.After hydrogen absorption,the BCC structural phase undergoes a transformation.The alloy pow-der is activated of 623 K and 4 MPa and the first hydrogen absorption is carried out on conditions of 303,323,343 K and 2 MPa hy-drogen pressure respectively.The mass fraction of maximum hydrogen absorption are1.135%,1.014%and0.965%respectively.As the temperature of hydrogen absorption decreases,the maximum amount of hydrogen absorption increases,which shows the hydrogen ab-sorption performance of the alloy is better at lower temperatures.The mass fraction of maximum hydrogen desorption are 0.326%,0.36%and 0.445%respectively.The difference between the hydrogen desorption capacity and the hydrogen absorption capacity is significant.The hydrogen desorption of the alloy is not complete and the hydrogen desorption performance is poor.The enthalpy and en-tropy changes of alloy hydrogen desorption are as follows:ΔH=22.47032 kJ/mol;ΔS=72.94196 J/mol·K.
TiVCrNb high entropy alloycrystal structurehydrogen storage performance
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