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M: Metallphysik

M 4: Flüssige und amorphe Metalle II

M 4.3: Vortrag

Montag, 8. März 2004, 12:15–12:30, H16

Numerical simulations of growth morphologies and characteristic microsrtucture quantities in a binary eutectic alloy — •Denis Danilov and Britta Nestler — Fachhochschule Karlsruhe

Recently, a generalized phase-field model has been formulated by Garcke, Nestler and Stinner that is especially appropriate for modelling phase transitions in alloy systems with multiple components and multiple phases. In this work we explore characteristic microsrtuctures occuring in different regions of a typical binary eutectic phase diagram using uniform approach based on the generalized phase-field model both for simulation of single phase growth and for two phase growth structures. To obtain numerical solution of governing equations we use finite element method with an adaptive mesh refinement. Simulations include single primary phase growth and melting of eutectic structure above the eutectic temperature and eutectic and off-eutectic solidification below. Components redistribution in the liquid along the solidification front and along the growth direction for different growing structures, dependence of two phase lammelar growth on value of surface entropy densities are analysed and compared with theoretical predictions.