Microstructure and Hydrogen Storage Behavior of TiCrMo Alloys Fabricated via Melt Spinning

High-density hydrogen storage materials are crucial for the advancement of hydrogen energy. This work investigates the synthesis and characterization of a low-cost and high-performance Ti45Cr52Mo3 alloy through arc-melting and melt-spinning processes. The alloy exhibits a significant dehydriding density of 2.4 wt % at 85 °C, indicating its potential as a hydrogen storage material. A comprehensive analysis of the alloy's microstructural evolution, de/hydrogenation thermodynamics, and cyclic properties has been conducted. The melt-spinning process improves compositional uniformity and restricts the β-Ti phase transformation in the low-Mo alloy. Consequently, the hydrogen absorption capacity increases from 1.5 to 3.3 wt % after melt-spinning, with a dehydriding plateau pressure of 0.2 MPa at 85 °C. Above 0.1 MPa, the alloy exhibits an effective dehydriding density of 2.40 wt %. The enthalpy value of the Ti45Cr52Mo3 alloy during de/hydrogenation, calculated using the van't Hoff equation, aligns with that of V-based BCC hydrogen storage alloys. This work also discusses the structural transformations during de/hydrogenation and explains the underlying causes of capacity attenuation after the de/hydrogenation cycle. These findings offer valuable insights into the development of high-density hydrogen storage materials, presenting a promising pathway for advancing hydrogen energy technologies.