首页|Formation of primary intermetallic phases in the interaction of Fe-containing melts of recycled Al-Si alloys with Al2O3 and Al2O3-C filter materials:A μ-CT study

Formation of primary intermetallic phases in the interaction of Fe-containing melts of recycled Al-Si alloys with Al2O3 and Al2O3-C filter materials:A μ-CT study

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Fe is the most detrimental impurity element in recycled Al-Si alloys due to the formation of brittle,pri-mary,Fe-containing,intermetallic particles during solidification.Their removal from the Al-Si melts e.g.by filtration can reduce the Fe content.New active filter materials can facilitate the formation of these particles for their removal and contribute to the production of high-quality,recycled Al-Si alloys.The interaction of the alloy with the filter material can lead to modification of the thermodynamics of the alloy or of the kinetics of the particle formation.Time-resolved,three-dimensional microstructural inves-tigations have been carried out to study the formation of primary intermetallic particles in Al7.1Si1.5Fe and Al7.1Si0.75Fe0.75Mn alloy melts in contact with Al2O3 and Al2O3-C filter substrate material during a melt conditioning treatment at 620 ℃.The microstructures,in particular the primary intermetallic par-ticles αc and αh,have been characterized by computed tomography(CT)and supplementary scanning electron microscopy(SEM).As expected by thermodynamics,the total volume fraction of primary par-ticles remains unchanged by the interaction with the substrate materials.However,kinetic advantages for Fe-removal efficiency can be achieved by an accelerated and preferred selective particle formation in contact with the Al2O3-C material.Furthermore,particle formation is discussed in view of its different stages:nucleation,growth,and ripening.

Aluminum alloysIntermetallic phasesSolidificationX-ray computed tomographyScanning electron microscopy

H.Becker、B.Fankh?nel、A.Charitos、S.Baier-Stegmaier、A.Leineweber、W.Pantleon

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Institute of Materials Science,TU Bergakademie Freiberg,Gustav-Zeuner-Straβe 5,09599 Freiberg,Germany

Department of Civil and Mechanical Engineering,Technical Univeristy of Denmark,Produktionstorvet 425,2800 Kgs.Lyngby,Denmark

Institute of Nonferrous Metallurgy and Purest Materials,TU Bergakademie Freiberg,Leipziger Straβe 34,09599 Freiberg,Germany

Department of Physics,Technical Univeristy of Denmark,Fysikvej 310,2800 Kgs.Lyngby,Denmark

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German Research Foundation(DFG)for supporting these investigations as part of the Collaborative Research Centre 920German Research Foundation(DFG)for supporting these investigations as part of the Collaborative Research Centre 920Danish Agency for Science and Higher Education

169148856A07C065072-00030B

2024

10.1016/j.jmst.2023.09.047

材料科学技术(英文版)
中国金属学会 中国材料研究学会 中国科学院金属研究所

材料科学技术(英文版)

CSTPCD
影响因子：0.657
ISSN：1005-0302
年,卷(期)：2024.184(17)
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