Microstructure and Hydrogen Storage Behavior of TiCrMo Alloys Fabricated via Melt Spinning
Huazhou Hu, Songsong Li, Wenhao Zhou, Houqun Xiao, Xincong He, Xiaoxuan Zhang, Ruizhu Tang, Chuanming Ma, Qingjun Chen
Abstract
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 Ti 45 Cr 52 Mo 3 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 Ti 45 Cr 52 Mo 3 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.