INTERFACE ENHANCED GLASS-FORMING ABILITY UNDER ION MIXING SOLID-STATEREACTION IN AN IMMISCIBLE HF-TA SYSTEM

Hf-Ta multilayered films were designed to consist of a total of six la yers which added enough interfacial free energy to elevate the initial energetic level of the films to surpass that of the amorphous state. In these multilayered films, amorphization was indeed achieved by room -temperature 200 keV xenon ion irradiation, as well as by room-tempera ture aging, in a broad composition range from Hf26Ta74 to Hf90Ta10, sh owing a significant enhancement of the glass forming ability by the in terfaces. Moreover, an Hf26Ta74 amorphous alloy was also obtained by t hermal annealing of the multilayered films at 315 degrees C for 3 h.