Abstract
A Gibbs free energy diagram of the Ru–Ta system is derived from Miedema’stheory, which predicts that the metallic glass forming range of the systemis within 25–55 at.% of Ta. The unique amorphous alloys are produced for theRu75Ta25,Ru65Ta35,Ru57Ta43 and Ru50Ta50 multilayers upon ion irradiation, matching well with the predicted glass forming range. However, forthe Ru43Ta57 multilayer, a mixing microstructure consisting of the amorphous and crystallinephases is obtained. Besides, an interesting phenomenon is observed for theRu25Ta75 multilayer, i.e. the transient fcc-Ru and fcc-Ta are first formed respectivelyfrom the original hcp-Ru and bcc-Ta upon irradiation and then a uniquefcc-Ru25Ta75 phase is eventually formed from the transient fcc-Ru and fcc-Ta upon further irradiation. Abrief discussion of the experimental results is presented based on the ab initiocalculations.
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