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Microstructure and Mechanical Properties of a Multiphase FeCrCuMnNi High-Entropy Alloy

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Abstract

A FeCrCuMnNi high-entropy alloy was produced using vacuum induction melting, starting from high-purity raw materials. The microstructure and mechanical properties of the as-cast FeCrCuMnNi alloy were studied, considering x-ray diffraction (XRD), scanning electron microscopy, and hardness and tensile tests. XRD results revealed the existence of two FCC phases and one BCC phase. Microstructural evaluation illustrated that the as-cast alloy has a typical cast dendritic structure, where dendrite regions (BCC) were enriched in Cr and Fe. Interdendritic regions were saturated with Cu and Ni and revealed G/B(T) {110} 〈111〉 and Brass {110} 〈112〉 as the major texture components. The produced alloy revealed an excellent compromise in mechanical properties due to the mixture of solid solution phases with different structures: 300 HV hardness, 950 MPa ultimate tensile strength and 14% elongation. Microhardness test results also revealed that the BCC phase was the hardest phase. The fracture surface evidenced a typical ductile failure. Furthermore, heat treatment results revealed that phase composition remained stable after annealing up to 650 °C. Phase transformation occurred at higher temperatures in order to form more stable phases; therefore, FCC2 phase grew at the expense of the BCC phase.

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Authors and Affiliations

  1. Department of Materials Engineering, Isfahan University of Technology, Isfahan, 84156-83111, Iran

    Ali Shabani, Mohammad Reza Toroghinejad & Ali Shafyei

  2. Thermomechanical Metallurgy Laboratory - PX Group Chair, Ecole Polytechnique Fédérale de Lausanne (EPFL), 2002, Neuchâtel, Switzerland

    Ali Shabani & Roland E. Logé

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  1. Ali Shabani
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  2. Mohammad Reza Toroghinejad
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Correspondence to Mohammad Reza Toroghinejad.

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Shabani, A., Toroghinejad, M.R., Shafyei, A. et al. Microstructure and Mechanical Properties of a Multiphase FeCrCuMnNi High-Entropy Alloy. J. of Materi Eng and Perform 28, 2388–2398 (2019). https://doi.org/10.1007/s11665-019-04003-4

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  • DOI: https://doi.org/10.1007/s11665-019-04003-4

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