|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Frontiers in Solidification: An MPMD Symposium in Honor of Michel Rappaz
||Complex Dynamics of Multiphase Solidification Front Patterns in Ternary Eutectic Alloys
||Silvere Akamatsu, Sabine Bottin-Rousseau, Gabriel P Faivre
|On-Site Speaker (Planned)
We present a real-time experimental study of two- and three-phased patterns during directional solidification of nonfaceted ternary eutectics. We will first consider eutectic cells and dendrites during univariant growth. We will focus on the scaling laws of the “spiral eutectic dendrite”, which is a nearly paraboloidal finger-like growth morphology with eutectic growth starting from a spiraling structure at the tip. Second, we will present recent results on the dynamics of three-phased, nonvariant eutectic growth patterns in thin samples. Steady-state lamellar growth involving three solid phases can exhibit various stacking motifs. Experimentally, the sole stable motif was of ABAC type (A, B and C designate the three solid phases). We have studied the morphological stability of ABAC patterns as a function of growth velocity and lamellar spacing. We will discuss our observations in reference to previous experimental and numerical work, and finally present more occasional observations of complex, multiscale patterns.