Abstract
The thermal stability, glass-forming ability (GFA), and mechanical and electrical properties of Au-based AuxSi17Cu75.5–xAg7.5 (x = 40 to 75.5 at. pct) metallic glasses were investigated. The glass transition temperature (Tg) and crystallization temperature (Tx) decreased with increasing Au content. The ultralow Tg values below 373 K (100 °C) were obtained for alloys with x = 55 to 75.5. The alloys with x = 45 to 70 exhibited a high stabilization of supercooled liquid and a high GFA, and the supercooled liquid region and critical sample diameter for glass formation were in the range of 31 K to 50 K and 2 to 5 mm, respectively. The compressive fracture strength (σc,f), Young’s modulus (E), and Vicker’s hardness (Hv) of the bulk metallic glasses (BMGs) decreased with increasing Au content. A linear correlation between Au concentration and the characteristic temperature, i.e., Tg and Tx, and mechanical properties, i.e., σc,f, E, and Hv, as well as electrical resistivity can be found in the BMGs, which will be helpful for the composition design of the desirable Au-based BMGs with tunable physical properties.
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