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Author: search.filters.author.Eskin, Dmitry G.Subject: search.filters.subject.electrical conductivity

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    Microstructure, Hardening, and Mechanical Properties of Hypoeutectic Al–Ce–Ni Alloys with Zr and Zr + Sc Additions and the Effect of Ultrasonic Melt Processing
    (2023-11-01)
    Chankitmunkong, Suwaree
    ;
    Wang, Feng
    ;
    Limmaneevichitr, Chaowalit
    ;
    Eskin, Dmitry G.
    Ternary Al–Ce–Ni alloys have a potential in the manufacture of automotive and airspace components, as well as in replacing traditional aluminum alloys in high-temperature applications, which is determined by the formation of fine and thermally stable Al<inf>11</inf>Ce<inf>3</inf> and Al<inf>3</inf>Ni eutectic. Herein, the microstructure and mechanical properties of a hypoeutectic Al<inf>4</inf>Ce<inf>2</inf>Ni alloy using Zr and Zr + Sc additions combined with ultrasonic melt processing and dispersion hardening are improved. As a result, the grain structure of the as-cast alloys is significantly refined and the annealing at 350 °C leads to a considerable hardening effect, especially in the alloys with Zr + Sc additions (doubling the hardness). Al<inf>3</inf>Zr and Al<inf>3</inf>(Zr,Sc) coherent particles are identified as hardening nanoprecipitates. The compressive mechanical testing at room and elevated temperatures shows that the additions of Zr and Zr + Sc improve the strength with the additional increase caused by ultrasonic melt processing.