Gaseous Hydrogenation and Its Effect on Thermal Stability of Mg₆₃Ni₂₂Pr₁₅ Metallic Glass

Mg₆₃Ni₂₂Pr₁₅ metallic glasses are produced by a single roller melt-spinning technique. The hydrogen absorption and desorption capacities are respectively 0.38 and 0.14 wt.% at 313 K obtained by pressure-composition isotherm. The amorphous structure is found to be retained after gaseous hydrogenation. The glass transition temperature, the onset crystallization temperature, and the crystallization temperature of the hydrogenated Mg₆₃Ni₂₂Pr₁₅ metallic glass are 550, 570 and 577 K, respectively, much higher than the corresponding values of 440, 470 and 499 K of the as-quenched sample. This means that dramatic enhancement of thermal stability occurs in Mg₆₃Ni₂₂Pr₁₅ metallic glass due to hydrogenation.