5th International Conference on Advances in Solidification Processes (ICASP-5) 5th International Symposium on Cutting Edge of Computer Simulation of Solidification, Casting and Refining (CSSCR-5)

Lamellar eutectic two-phase growth is in principle well understood for alloys in which the solid-liquid and solid-solid interfaces are isotropic. However, there are numerous experimental observations that cannot be explained by theories and numerical models with isotropic interfaces. Examples are the occurrence of lamellar growth directions that markedly differ from the direction of the temperature gradient, or the emergence of large regions of perfectly aligned lamellae in large samples. We have developed a phase-field model in which the anisotropy of each interface can be controlled separately, and we have investigated the case of anisotropic solid-solid (interphase) boundaries. Results will be presented (i) on the selection of lamellar growth directions in thin-sample directional solidification, (ii) on the ordering of lamellae in bulk samples, and (iii) on the dynamics of spacing homogenization in inhomogeneous lamellar arrays. Simulation data will be compared to available theories and experimental data.