Dresden 2006 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
MM: Metall- und Materialphysik
MM 13: Symposium Modern Metallic Materials Design III
MM 13.7: Vortrag
Dienstag, 28. März 2006, 12:15–12:30, IFW B
Rapid solidification of Cu-Co alloy — •Jiuzhou Zhao1, Matthias Kolbe2, Jianrong Gao3, L. L. Gao1, Lorenz Ratke2, and Dieter M. Herlach2 — 1Institute of Metal Research, CAS, Shenyang 110016, China — 2Institute of Space Simulation, German Aerospace Center DLR, D-51170 Cologne, Germany — 3Key Lab of Electromagnetic Processing of Materials, Northeastern University, Shenyang 110004, China
A model is developed to describe the microstructure evolution in Cu-Co drops during cooling in the metastable miscibility gap in the liquid state. Calculations have been carried out according to the solidification experiments with Cu84Co16 alloy under drop tube conditions to the investigation of the kinetics of the liquid-liquid phase transformation in Cu-Co drops. It is demonstrated that the microstructure development is dominated by the common action of the nucleation and the diffusional growth of the minority phase droplets under the rapid solidification conditions. The calculated distribution of Co-precipitates and their average radius as a function of cooling rate are compared with the experimental results. The agreement is satisfactory.