Thermal stability and glass-forming ability of new Ti-based bulk metallic glasses

Abstract

New Ti-based metallic glass (Ti 53Cu 15Ni 18.5Al 7Si 3M 3B 0.5 (M = Sc, Hf, Ta, Nb)) alloys were prepared by melt spinning and copper mold casting. The effects of foreign atoms on the thermal stability and the glass-forming ability were investigated by X-ray diffraction (XRD), differential scanning calorimetry (DSC) and differential thermal analysis (DTA). The results show that the values of T rgs are 0.619, 0.609, 0.606, 0.597 K and Δ T xs are 58, 54, 85, 78 K, respectively. The foreign atom’s size factor (∥ R F − R Ti∣/ R Ti − 0.12∣) and mixing heat factor (∑ x i H iF /∑ x i W i ) are proposed to predict the glass-forming ability and thermal stability, respectively.