Figure 3
Temperature-time curve of BMG specimens (Ø = 4.5 mm, h = 4 mm) during flash-annealing. (a) Representative temperature-time heating curve and its derivative for a Zr52.5Cu17.9Ni14.6Al10Ti5 BMG specimen flash-annealed at φ ave = 38 K/s to T ej = 1005 K. The intersection of the two linear fits marks the glass-transition temperature, T g, and the beginning of the steep temperature increase indicates the crystallization temperature, T x . (b) Heating curve of a Cu44Zr44Al8Hf2Co2 BMG specimen (φ ave = 127 K/s) to which a load is applied during heating. Snapshots of a high-speed camera show that the shape of the specimen starts to change at temperatures higher than the intersection. The specimen is deformed more and more and hence the intersection of both linear fits marks T g.
