Contribution Oral Presentation
PHASE BOUNDARY ANISOTROPY IN LAMELLAR EUTECTICS: RESULTS FROM RECENT MICROGRAVITY EXPERIMENTS
Directional solidification of eutectics has been extensively studied in systems which display regular coupled growth with the solid-liquid interfaces being non-faceted. The solid-solid phase boundaries however may be locked or loosely attached to planes with a low energy configuration being associated with a characteristic crystallographic orientation relationship (OR). The phase boundary energy landscape and its anisotropy can have a major impact on eutectic growth and we shall give an account of the current state of knowledge and of the most recent observations gained from bulk Al-Al2Cu eutectics during (i) the maze-to-lamellar transition, (ii) the steady state growth and (iii) the formation of eutectic cells. We refer to Al-Al2Cu eutectics for which the phase boundary energy anisotropy was estimated from molecular dynamic computations (MD). We shall give an outlook on future research tasks and discuss the ability to understand and control the orientation and defect density of an arbitrary lamellar eutectic.