|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Materials Research in Reduced Gravity
||Influence of Convection on the Dendrite/Eutectic Growth Velocity in Cu-Zr Alloys (project MULTIPHAS)
||Stefanie Koch, Jan Gegner, Peter Galenko, Markus Rettenmayr, Dieter Herlach
|On-Site Speaker (Planned)
Cu-Zr exhibits a relatively high glass-forming ability and thus is frequently used as basis for multicomponent bulk metallic glasses (BMGs). The binary system Cu-Zr is a model-system to understand the structure and properties of BMGs. Using an electromagnetic levitation technique we study the solidification behavior during equiaxed growth employing a wide range of initial undercoolings. The eutectic concentration of the Cu56Zr44 alloy leads to simultaneous solidification of two phases in contrast to single phase dendritic solidification of the intermetallic compound Cu50Zr50. The influence of convective flow on solidification of eutectic systems has been demonstrated earlier. For identifying the influence of convection on the growth velocity, parabolic flight experiments were carried out under reduced gravity conditions.
Measurements of the growth velocity versus undercooling in the environment of reduced gravity are compared with those measured in the Earth laboratory.
This work is supported by the DLR Space Management within project MULTIPHAS.
||Planned: A print-only volume