Figure 2: The predicted mechanical behaviour of BMG formers under typical cooling rates.
From: Critical fictive temperature for plasticity in metallic glasses

The maximum variation in Tf is about 40 K as a result of critical cooling rate, which spans over four orders of magnitude among BMG formers. BMG formers with Tfc out of the accessible Tf range are either always ductile (Tf−Tfc>40 K) or brittle (Tf−Tfc≤40 K). However, BMG formers with Tfc~Tf can change from ductile–brittle within practical cooling-rate variations.