Role of Se addition on the glass formation and crystallization of Cu-Zr glassy alloy

Selenium (Se) is widely known for its applications in glass production, medical treatments, and as a photoconductor. In this study, we found a new potential use of Se, namely, as a microalloying constituent for bulk metallic glasses (BMGs). By adding proper amounts of Se, we can enhance the glass-forming ability (GFA) and thermal stability of the Cu₅₀Zr₅₀ alloy, without compromising its excellent mechanical properties. However, once the Se content surpasses a certain threshold, it will lead to the preferential precipitation of a selenide phase, which catalyzes the formation of other intermetallic phases during casting and heating, thereby deteriorating the GFA and thermal stability. The use of Se in microalloying may provide new opportunities for the industrial applications of BMGs.