|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Materials Research in Reduced Gravity
||Metastable Phase Formation from Undercooled Melt in Peritectic Systems under Terrestrial and Microgravity Conditions: Fe-Co vs. Ti-Al
||Olga Shuleshova, Wolfgang Löser, Thomas Volkmann, Christian Karrasch, Douglas M. Matson, Mikhail Krivilyov, Stepan Lomaev, Jan Fransaer
|On-Site Speaker (Planned)
Competition between stable and metastable phases growing from an undercooled melt have been observed for many alloy systems. Provided the thermodynamic criteria are fulfilled, the selection of the primary phase and its life time are strongly affected by the level of convection within the melt. Here we present a comparative study of two industrially relevant peritectic systems, Fe-Co and Ti-Al, where at critical undercooling the metastable bcc phase forms instead of the stable close-packed structures. Different stirring conditions are attained using electromagnetic levitation in terrestrial and reduced gravity experiments during parabolic flight campaigns (TEMPUS facility). The experimental results are supported by the elaborate modeling which accounts for the interplay between the fluid flow, heat transfer and phase selection in a given system. The presented work is a part of the ongoing activities under the projects MAGNEPHAS, PARSEC, and ELFSTONE with the electromagnetic levitator recently installed on the International Space Station.
||Planned: A print-only volume