Abstract
FeCoNiMo and CrFeCoNiMo equimolar alloys were prepared by arc-melting. The microstructures of the as-cast alloys were examined by SEM, HREM and XRD; and a potentiodynamic polarization test of the as-cast alloys was undertaken to evaluate the corrosion resistance in the solutions. Results showed that both of FeCoNiMo and CrFeCoNiMo equimolar alloys had a dendritic structure. The dendrites of these two alloys were a single phase which was a simple cubic (SC) structure with large lattice constant; and the interdendrities of these two alloys had a dual-phased eutectic structure in which the phases were face-centered cubic (FCC) and simple cubic (SC). The hardness of CrFeCoNiMo alloy was higher than that of FeCoNiMo alloy. Additionally, the potentiodynamic polarization test showed that CrFeCoNiMo alloy was better than FeCoNiMo alloy in 1 M nitric acid and 1 M sodium chloride solutions. Adding chromium into FeCoNiMo alloy could increase corrosion resistance in these two solutions. All of the results indicated that the CrFeCoNiMo alloy surpassed FeCoNiMo alloy.
Highlights
Nowadays, researchers can select the elements to prepare new materials for applications by following the high-entropy alloy concept [1,2,3]
The crystal structures of the phases in the alloys were examined by HREM diffraction patterns (DPs) which were transformed from the high-resolution lattice images by fast Fourier transformation (FFT) of Gatan digital micrograph software 1.4.1
The potentiodynamic polarization curves of FeCoNiMo and CrFeCoNiMo alloys tested in 1M deaerated HNO3 solution at 30 and 60 ◦C are shown in Figure 5a,b, respectively
Summary
Researchers can select the elements to prepare new materials for applications by following the high-entropy alloy concept [1,2,3]. Some of the alloys were developed as coating layers to improve corrosion resistance of base materials. NbTiAlSiZrNx alloy sputtered on the surface of 304 stainless steel showed good corrosion resistance in 1 N H2SO4 solution [15]. AlCrxNiCu0.5Mo alloys coated on the surface of Q235 steel can improve the corrosion resistance in NaCl solution [16]. FeCoNi and CrFeCoNi equimolar alloys showed a good corrosion resistance in 1 M sodium chloride solution as reported in our previous study [23]. Both FeCoNi and CrFeCoNi alloys had a FCC granular microstructure, and they were very soft. The present study investigated the effect of the addition of molybdenum on these alloys, and analyzed the microstructures, hardness and corrosion properties of FeCoNiMo and CrFeCoNiMo alloys
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