|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Frontiers in Solidification Science and Engineering
||Liquid Demixing in Undercooled Co-Cu Alloys
||Matthias Kolbe, Christoph Dreissigacker, Stefan Burggraf, Mareike Wegener, Florian Kargl
|On-Site Speaker (Planned)
The metallic system Co-Cu shows a metastable miscibility gap in liquid. Upon undercooling the melt below the liquidus at around 120 K, the homogeneous melt separates into Co-rich and Cu-rich liquids. Due to undercooling the melt solidifies rapidly after nucleation and the metastable state is frozen to a certain extent. In Cu-rich melts demixing occurs as nucleation of a dispersion of Co-rich droplets in the Cu-rich liquid. The Co-rich droplets grow in time, driven by minimisation of interface energy between the two liquids, (i) by diffusion, (ii) collisions between droplets, (iii) movement in the Cu-rich liquid. However, the whole process is greatly influenced by convection in the melt making it difficult to describe the physical mechanisms behind demixing and phase growth. Here we present results from undercooling and solidification experiments conducted under microgravity conditions in MAPHEUS sounding rockets. The results are compared to other experiments with various convective conditions.
||Planned: Supplemental Proceedings volume