Improved Hydrogen Storage Properties of Ti₂₃V₄₀Mn₃₇ Alloy Doped with Zr₇Ni₁₀ by Rapid Solidification

As-cast and rapidly solidified Ti₂₃V₄₀Mn₃₇ alloy doped with Zr₇Ni₁₀ was synthesized by arc melting and melt-spinning. The microstructure, activation property, hydrogen absorption kinetics, and hydrogen absorption/desorption thermodynamics were investigated to evaluate a comprehensive hydrogen storage property of the alloys. Both preparation methods had a negligible effect on the lattice parameter of BCC and C14 Laves phases in the alloys. The alloy prepared by melt-spinning showed an increased proportion of BCC phase, larger hydrogen absorption capacity, faster hydrogen absorption rate, and higher hydrogen absorption/desorption platform pressure. The dehydriding enthalpy and endothermic peak temperature of the rapidly solidified alloy were 33.55 ± 2.14 KJ/mol H₂ and 526.2 K, respectively, which are smaller than those of the as-cast alloy. It indicates the decreased hydride stability and improved hydrogen desorption property. By contrast with the as-cast alloy, the rapidly solidified alloy showed a preferable comprehensive hydrogen storage property.