| Abstract Scope |
Applying ultrafast differential-scanning calorimetry experiments on bulk metallic glass-forming systems that show sluggish crystallization kinetics, we are able to determine phase transitions more or less in “slow motion”. In this way we can discover new phase-transition pathways, such as a solid-solid phase transformation via metastable melting [1], and interrupt rapid cooling after a phase transition to study the thermophysical properties of this phase via melting it at rapid heating [2]. We thus can unravel hidden transient phases (incl. quasicrystals) and construct metastable phase diagrams. The technique also allows us to identify different types of monolithic metallic glass that show distinctly modified short-range order, and thus to generate a novel glass state that reveals stochastic nucleation at intermediate undercooling [3].
[1] S. Pogatscher, et al., Nature Comm. 7, 11113 (2016).
[2] G. Kurtuldu, K.F. Shamlaye, J.F. Löffler, PNAS 115, 6128 (2018).
[3] J.E.K. Schawe, J.F. Löffler, Nature Comm. 10, 1337 (2019). |