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        Oxidation Behavior of CoCrFeMnNi High-Entropy Alloy Fabricated by Selective Laser Melting

        Xiquan Jia,Zhenlin Xu,Yizhu He,Shengxuan Zhou,Xiaojie Du,Hui Zhang,Aiqin Mao 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.10

        The present study investigated the microstructure and oxidation behavior of the CoCrFeMnNi high-entropy alloy (HEA) prepared by selective laser melting (SLM). The microstructure of the as-built sample comprised layer-by-layer overlapping melt pools, columnar grains, and cellular structures. The melt pool boundaries (MPBs) and cellular structures disappeared, and the dislocation density decreased after annealing at 900 °C. The high-temperature oxidation behavior of the CoCrFeMnNi HEA was investigated via oxidation kinetics, morphology observation, and oxidation product analysis. The oxidation kinetics followed the parabolic law at 800 to 1000 ℃. There were three layers of oxide scale at all temperatures. At 800 to 1000 °C, the inner oxide layer was Cr2O3; the intermediate layer consisted of Cr-oxides and Mn-oxides. The outer oxide layer mainly consisted of Mn2O3 at 800 to 900 °C and Mn3O4 at 1000 °C. At 1000 °C, the fast diffusion channels provided by MPBs led to preferential oxidation in the as-built HEA. And the preferential oxidation behavior in the annealed HEA was inhibited due to the removal of MPBs by annealing. At each temperature, the annealed HEA showed relatively better oxidation resistance than the as-built sample.

      • KCI등재

        Uniform Microstructure and Excellent Corrosion Resistance of HVOF-Sprayed CoCrNi Medium-Entropy Alloy Coating in Fluoride Ion Environment

        Dongbao Huang,Zhenlin Xu,Xiquan Jia,Haitao Yu,Yizhu He,Zhenqi Dong,Shenshen Li,Hui Zhang 대한금속·재료학회 2024 METALS AND MATERIALS International Vol.30 No.1

        To solve the corrosion problem of the copper plates caused by fluoride ions, the Ni55 and CoCrNi medium-entropy alloycoatings were prepared via high-velocity oxygen fuel technology. The corrosion resistance of the Ni55 and CoCrNi coatingsin NaF solution was compared through electrochemical experiments and immersion corrosion experiments. The Ni55coating contained complex precipitated phases, resulting in preferential corrosion at the phase boundaries between the γ-Nisolid solution and the precipitated phases. The composition of the CoCrNi coating was more homogeneously distributed,and mainly uniform corrosion occurred. The corrosion products of the two coatings in the NaF solution were both complexescomposed of metal oxides and fluorides. Compared with the Ni55 coating, the passive film formed on the CoCrNi coatinghad a more uniform and protective property; therefore, the CoCrNi coating had better corrosion resistance. This researchcan pave a pathway for developing coating on copper and its alloys with excellent corrosion resistance.

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