|About this Abstract
||2019 TMS Annual Meeting & Exhibition
||Solidification Processing of Light Metals and Alloys: An MPMD Symposium in Honor of David StJohn
||Four-phase Eutectic Topology in Solidification Rosettes
||Djar Oquab, Claudie Josse, Arnaud Proietti, Alessandro Pugliara, Jacques Lacaze
|On-Site Speaker (Planned)
Differential thermal analyses of a AlSi6Cu4Fe2 alloy were performed which showed the formation of so-called rosettes by solidification of liquid pools entrapped within dendrite arms. Contrary to previous results, it was observed that the number of these rosettes increases at decreasing cooling rate.
The very fine eutectic microstructure within these rosettes was investigated by scanning and transmission electron microscopy which showed the precipitation of a four-phase regular eutectic; it is thus one of the very few reported in the literature.
Focused Ions Beam milling (FIB) was then used to investigate the topology of the distribution of the four phases and Electron Backscattered Diffraction (EBSD) analysis was carried out to investigate their local crystallographic orientations.