High-temperature Mo-based bulk metallic glass with enhanced glass forming ability

Although high-temperature MoCoB bulk metallic glasses (BMGs) exhibit exceptionally high thermal stabilities, the relatively poor glass forming ability (GFA) has constrained their widespread applications. Herein, we developed a MoCoCrBC BMG with robust GFA and a critical casting diameter of 3 mm. The experimental and molecular dynamics simulation results revealed that the specific icosahedral-like cluster structure significantly influences the GFA. The competition of multiple structural units in the high-temperature liquid helps maintain the stability of supercooled liquids, thereby enhancing the GFA of the MoCoCrBC alloy.