Abstract Scope |
Via applying fast differential scanning calorimetry at heating and cooling rates of several 10,000 K/s to slowly transforming bulk metallic glass (BMG)-forming systems, it is possible to explore novel glass states [1], determine their stochastics of nucleation, and study the formation of new metastable phases. Upon slow heating from low temperature, BMGs generally form metastable crystals that transform into more stable modifications at higher temperatures. However, with fast calorimetry we are able to suppress this transition and thus measure in detail the thermophysical properties of metastable phases, such as heat capacities and melting temperatures [2]. In this way, we can study phase-transition pathways [3], verify the existence of monotropic polymorphism and validate Ostwald’s phase rule for many metastable phases. [1] J.E.K. Schawe, J.F. Löffler, Nat. Commun. <B>10</B>, 1337 (2019). [2] J.E.K. Schawe, J.F. Löffler, Acta Mater. <B>226</B>, 117630 (2022). [3] S. Pogatscher et al., Nat. Commun. <B>7</B>, 11113 (2016). |