Fe based alloys LC-MS analysis Mössbauer spectroscopy Technology UV-visible spectrophotometry aluminum atomic redistribution austenitic alloys ball-milling decolorization half-Heusler alloys high entropy alloy high-nitrogen steels hydriding kinetics hydrogen storage mechanical alloying mechanical properties metal hydrides microcrystalline (MC) alloy microstructure microstructure and mechanical properties microwave sintering nanocrystalline (NC) alloy oxidation resistance phase transformation point defects reactive black 5 refractory surface modification yttrium oxide (yttria)