Relationship between mixing time and hydrogen storage capacity in the MgVAlCrNi-based HEA alloy

A pentametallic HEA alloy with light metals was developed through high-energy ball milling. Various milling parameters were studied, focusing on the mixing time. The activation/deactivation experiments revealed that the best hydrogen absorption condition occurs at 390°C and 80 bar, while desorption takes place at 300°C, demonstrating complete reversibility. This characteristic was further emphasized during adsorption/desorption cyclic tests. The results indicated that as mixing time increases, absorption performance improves, and an almost linear correlation was observed between milling time and H₂ adsorption capacity. Additionally, the desorption process became increasingly efficient, achieving reversibility even at lower temperatures.