Multistep Crystallization and Melting Pathways in the Free-Energy Landscape of a Au-Si Eutectic Alloy.

ABSTRACT: Crystals do eventually melt if they are heated to their characteristic melting point. However, this is practically only the case for high-temperature stable crystals, whereas low-temperature metastable crystals generally transform, before melting, into a more stable solid during heating. Here, it is illustrated that low-temperature crystals can, however, be melted via fast differential scanning calorimetry (FDSC), even in metallic systems where nucleation and growth kinetics are rapid. For a Au-Si eutectic alloy, various metastable and stable solid states, i.e., (Au-α), (Au-β), γ, and (Au-Si), which form under well-controlled conditions and melt at high heating rates by preventing the metastable-to-stable solid phase transition, are isolated. It is demonstrated that Au_81.4Si

SUBMITTER: Kurtuldu G 

PROVIDER: S-EPMC7312312 | biostudies-literature | 2020 Jun

REPOSITORIES: biostudies-literature