Regensburg 2016 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 21: Microstructure and Phase Transformations I
MM 21.1: Vortrag
Dienstag, 8. März 2016, 11:45–12:00, H38
Undercooling behavior of the nucleation of liquid-liquid phase — •Christian Simon1, Yikun Zhang2, and Gerhard Wilde1 — 1Institut für Materialphysik, WWU Münster, Wilhelm-Klemm-Str. 10, 48155 Münster — 2State Key Laboratory of Advanced Special Steels, Shanghai University, Shanghai, 200072, China
A wetting transition from partial wetting to complete wetting is possible in alloys with a liquid miscibility gap. At a temperature Tp below the critical temperature Tc, the alloy separates in a two-phase liquid system which plays an essential role in the microstructure formation of monotectic alloys. A thermal cycling in the liquid state allows observing the mixing and the demixing transition. This allows a monitoring of the statistical behavior of the phase transition temperatures over a large number of cycles. We present data of the copper-cobalt and the copper-iron system obtained by classical DTA experiments. The copper-cobalt and the copper-iron system have a metastable miscibility gap. The interest is here in the observation of the undercooling behavior. Thus, the dependence of the mixing and the demixing transition on processing parameters and cycle number including the undercooling behavior of the demixing transition can be investigated. This allows a new access to the nature of nucleation of the bimodal phase separation process.