Microstructure and hydrogen storage properties of a TiZrNbMoV high entropy alloy synthesized using Laser Engineered Net Shaping (LENS)

After synthesis using a low laser power, the TiZrNbMoV alloy exhibited a two-phase dendritic matrix with some unmelted Mo particles and dendrites of a bcc solid solution surrounded by an orthorhombic NbTi4-type phase. The alloy that was deposited using a laser power of 1 kW and remelted three times possessed a multi-phase microstructure with a Mo-rich matrix containing Zr-rich precipitates and no dendritic segregation. The influence of the technological parameters employed during laser deposition on the microstructure and hydrogen storage properties of the synthesized TiZrNbMoV alloys will be presented and discussed.