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Steinbach, Sonja
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Publications (6/6 displayed)
- 2024Effect of wire drawing and heat treatment on the exfoliation corrosion mechanism of Al-Zn-Mg-Zr-V wires
- 2023X-radiography front tracking gradient furnace for directional solidification of bulk Al-alloys
- 2019Solidification sequence and four-phase eutectic in AlSi6Cu4Fe2 alloycitations
- 2018A large-scale 3d computer tomography analysis of primary dendrite arm spacing response to withdrawal velocity change using dendrite centre tracking
- 2017Skeletonisation to Find the Centre of Dendrites Traced from a 2D Microstructural Image
- 2010Flow Effects on Mush Coarsening
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article
Solidification sequence and four-phase eutectic in AlSi6Cu4Fe2 alloy
Abstract
International audience ; Differential thermal analyses of an AlSi6Cu4Fe2 alloy at various cooling rates from the liquid state were performed which showed: i) possible discrepancies in the first solidification steps and; ii) solidification ending with multiple peaks at low cooling rate. Metallographic observation of the samples gave hint for understanding the discrepancies while the presence of rounded multi-phase pools – or so-called rosettes - entrapped within dendrite arms explained the multiple peaks because they solidified independently of each other. The very fine eutectic microstructure in these rosettes was investigated by scanning electron microscopy which showed the precipitation of a four-phase eutectic. Focused ions beam milling was then used to investigate the topology of the distribution of the four phases. Electron backscattered diffraction analysis was carried out to investigate their local crystallographic orientations and transmission electron microscopy analysis was performed to identify the very fine crystalline structures. This eutectic appears as one of the very few regular four-phase eutectics reported in the literature.