Thermodynamic Calculation on Glass Forming Ability of Mo-Co-B System

In this work, thermodynamic calculation on glass forming ability of Mo-Co-B system was carried out based on a combination method of improved Miedema's model and Ouyang's model, and the influence of refractory and transition metals on glass forming ability of Mo-Co-B system was discussed. It is found that, Mo-Co-B system has high glass forming ability and amorphous alloys with composition close to Mo-B system have good thermal stability. Among Mo/W/Nb/Ta-Co-B systems, Nb and Ta-containing systems have high glass forming ability over a wide composition range, while W-containing system exhibits low glass forming ability. Among Mo-Co/Fe/Ni-B systems, Ni-containing system has high glass forming ability over a wide composition range, especially for Mo-rich corner and Mo-Ni edge, while Fe-containing system exhibits low glass forming ability. Comparison between the systems doping with refractory and transition metals indicates that, doping with refractory metals can better improve the glass forming ability of Mo-Co-B system.