Microstructure and hydrogen storage properties of Ti–V–Mn alloy with Zr, Ni, and Zr₇Ni₁₀ addition

Alloying is applied to improve the activation and hydrogen desorption properties of Ti–V–Mn alloys in this study. The effects of Zr, Ni, and Zr₇Ni₁₀ addition on phase composition, microstructure, and hydrogen storage properties of Ti₂₃V₄₀Mn₃₇ alloy are evaluated systematically. The BCC phases have different lattice parameters in alloy with different composition. The proportion of C14 Laves phase increases by alloying and reaches a maximum when the additive is Zr₇Ni₁₀. Zr addition has a positive influence on activation property and hydrogen absorption capacity, nevertheless, it reduces hydrogen desorption property. Ni addition has an opposite effect on hydrogen storage properties comparing with Zr addition. Under the synergetic effect of Zr and Ni, the alloy with Zr₇Ni₁₀ addition has an excellent comprehensive hydrogen storage properties of less activation cycles and better hydrogen desorption property. Graphical abstract: [Figure not available: see fulltext.].