|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Phase Transformations and Microstructural Evolution
||Effect of Velocity Change on Ternary Eutectic Morphology
||Amber Genau, Subhojit Chakraborty
|On-Site Speaker (Planned)
Three-phase eutectic growth can display a far wider variety of morphologies than the lamellar or rod-like structures usual in binary eutectics. In the Al-Ag-Cu system, at least five distinct ternary eutectic morphologies have been observed, attributable in part to differences in solidification velocity, thermal gradient, and crystallographic orientation. For this study the response of the system to a change in velocity was considered. A sample of the Al-Ag-Cu invariant eutectic composition was directionally solidified at 0.7 μm/s for 80 mm, before accelerating to 4.0 μm/s for an additional 50 mm. The microstructure was observed via transverse cross sections taken before, during and after the velocity change. EBSD analysis showed that the observed change in morphology did not correspond to a change in crystallographic orientation. Further image analysis will be used to suggest reasons for the change from a more ordered to a less ordered phase arrangement.
||Planned: A print-only volume