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Solidification sequence and four-phase eutectic in AlSi6Cu4Fe2 alloy

Oquab, Djar and Josse, Claudie and Proietti, Arnaud and Pugliara, Alessandro and Lacaze, Jacques and Steinbach, Sonja and Ferdian, Deni and Viguier, Bernard Solidification sequence and four-phase eutectic in AlSi6Cu4Fe2 alloy. (2019) Materials Characterization, 156. 109846. ISSN 1044-5803

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Official URL: https://doi.org/10.1016/j.matchar.2019.109846

Abstract

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.

Item Type:Article
HAL Id:hal-02458622
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Université de Toulouse > Institut National des Sciences Appliquées de Toulouse - INSA (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Other partners > Deutsches Zentrum für Luft- und Raumfahrt - DLR (GERMANY)
Other partners > Universitas Indonesia - UI (INDONESIA)
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Deposited On:28 Jan 2020 17:47

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