| Abstract Scope |
The effects of entropy stabilization and phase evolution on hydrogen storage activation were investigated in TiFeCoNiCu high-entropy alloys. The alloy was fabricated by mechanical alloying with controlled milling time to modify phase constitution and microstructure. X-ray diffraction analysis showed a gradual transformation from an initial multiphase mixture to a dual FCC solid-solution structure consisting of TiFe-rich and NiCu-rich phases. Prolonged milling promoted lattice distortion, crystallite refinement, and improved elemental homogeneity, as confirmed by SEM and EDS analyses. Thermodynamic parameters, entropy-related phase stability, and valence electron concentration are consistent with FCC phase formation in this system. Hydrogen interaction experiments indicate that activation behavior correlates with entropy-stabilized phase evolution rather than composition. |