Microstructure and corrosion behavior of FeCrNiMnMo<i><sub>x</sub></i> high‐entropy alloys fabricated by the laser surface remelting

Hu, Jinkang; Liu, Ying; Li, Wei

doi:10.1002/maco.202011674

Cited by 8 publications

(2 citation statements)

References 33 publications

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“…Due to the laser quenching effect of laser surface remelting treatment and the precipitation of nanoscale particulate matter after aging, heat treatment enhanced the hardness and wear resistance of the alloy, but they did not investigate the surface corrosion resistance of the material, which is very important as it relates to the environment in which the material is applied. Hu et al [12] examined the corrosion resistance of remelted layers by laser surface remelting of FeCrNiMnMo x (x = 0, 0.5, 1) alloys using a Nd:YAG laser. The results showed that the dendritic structure of the remelted alloy was significantly refined compared with the matrix due to the combined effect of Mo alloying and rapid solidification of the remelted surface, and the addition of Mo accelerated the formation of Cr 2 O 3 , improved the stability of the passivation film, and significantly improved the corrosion resistance in a 3.5% NaCl solution.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Properties of Laser Surface Remelting AlCoCrFeNi2.1 High-Entropy Alloy

Chen

Zhang

et al. 2022

Metals

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In this study, laser surface remelting of an AlCoCrFeNi2.1 high-entropy alloy was performed using a Yb:YAG laser. The effects of laser surface remelting on the phase structure, microstructure, Vickers hardness, frictional wear properties, and corrosion resistance of the high-entropy alloy were investigated. The remelted layer of the AlCoCrFeNi2.1 high-entropy alloy was produced by remelting at 750 W laser power and formed a good metallurgical bond with the substrate. The X-ray diffraction results showed that the 750 W remelted layer consisted of face-centered cubic and body-centered cubic phases, which were consistent with the phases of the as-cast AlCoCrFeNi2.1 high-entropy alloy, and a new phase was not generated within the remelted layer. Laser surface remelting is very effective in refining the lamellar structure, and the 750 W remelted layer shows a finer lamellar structure compared to the matrix. The surface hardness and wear resistance of the AlCoCrFeNi2.1 high-entropy alloy were substantially improved after laser surface remelting. In a 3.5 wt.% NaCl solution, the laser-remelted surface had a larger self-corrosion potential and smaller self-corrosion current density, and the corrosion resistance was better than that of the as-cast high-entropy alloy.

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Section: Introductionmentioning

confidence: 99%

Microstructure and Properties of Laser Surface Remelting AlCoCrFeNi2.1 High-Entropy Alloy

Chen

Zhang

et al. 2022

Metals

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“…For the factors dominating the corrosion resistance of alloys, except for the internal factors of composition and microstructure, [ 17–29 ] some external impacts are also essential to be considered. It is generally accepted that the temperature, electrolyte, and surface roughness are the most common factors affecting the actual corrosion performance of metallic materials.…”

Section: Introductionmentioning

confidence: 99%

Susceptibility of chloride ion concentration, temperature, and surface roughness on pitting corrosion of CoCrFeNi medium‐entropy alloy

Wang

Chen

et al. 2021

Materials & Corrosion

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The influence and susceptibility of chloride ion concentration, temperature, and surface roughness on corrosion behavior of single‐phase CoCrFeNi medium‐entropy alloy (MEA) was examined in NaCl solution. Potentiodynamic polarization results revealed that the corrosion performance of the sample deteriorated with an increase of the chloride ion concentration, temperature, and surface roughness. The pitting potential decreased drastically for samples with higher surface roughness. According to electrochemical impedance spectroscopy, the charge transfer resistance decreased when chloride ion concentration, temperature, and surface roughness increased. Scanning electron micrographs also indicated an increased extent of corrosion damage, especially for the sample with higher surface roughness. It is found that the corrosion resistance is closely related to the wettability of samples, and the surface with the highest roughness shows higher hydrophilicity. The combined results suggested that the pitting damage is more sensitive to surface roughness. Our findings provide a further understanding of the corrosion mechanism of MEAs and guide their applications as structural materials.

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Microstructure and atmospheric oxidation behavior of CrCuFeMnNiCo_x high‐entropy alloys fabricated by vacuum hot‐press sintering

Ren

Zhao

Jiang

et al. 2022

Materials & Corrosion

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The CrCuFeMnNiCox high‐entropy alloys (HEAs) were prepared by vacuum hot‐press sintering. The microstructure and atmospheric oxidation behavior at 800°C were studied. The phase structure of the Co0 alloy comprised the Cr‐rich FCC1 major phase, Cu‐rich FCC2 secondary phase, and a small amount of intermetallic compound ρ phase when x = 0. The bulk alloys comprised FCC2 major and FCC1 secondary phases when x ≥ 0.5. The oxidation kinetics curves approximately followed the parabolic law. A high Co content leads to a large oxidation weight gain of the alloys. The oxidation weight gain of the Co0 alloy was the smallest at approximately 4.46 mg cm−2 after atmospheric oxidation for 50 h, while the oxidation weight gain of the Co2.0 alloy was the largest at approximately 5.94 mg cm−2. The Co0 alloys exhibited the best oxidation resistance. Therefore, Co is not beneficial to the improvement of the oxidation properties of the CrCuFeMnNiCox HEAs. The main oxidation products of the HEAs mainly comprised MO, M2O3, M3O4, and (M,Cr)3O4 type metal oxides. The main oxidation mechanism was selective oxidation.

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Microstructure and corrosion behavior of FeCrNiMnMo_x high‐entropy alloys fabricated by the laser surface remelting

Cited by 8 publications

References 33 publications

Microstructure and Properties of Laser Surface Remelting AlCoCrFeNi2.1 High-Entropy Alloy

Microstructure and Properties of Laser Surface Remelting AlCoCrFeNi2.1 High-Entropy Alloy

Susceptibility of chloride ion concentration, temperature, and surface roughness on pitting corrosion of CoCrFeNi medium‐entropy alloy

Microstructure and atmospheric oxidation behavior of CrCuFeMnNiCo_x high‐entropy alloys fabricated by vacuum hot‐press sintering

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Microstructure and corrosion behavior of FeCrNiMnMox high‐entropy alloys fabricated by the laser surface remelting

Cited by 8 publications

References 33 publications

Microstructure and Properties of Laser Surface Remelting AlCoCrFeNi2.1 High-Entropy Alloy

Microstructure and Properties of Laser Surface Remelting AlCoCrFeNi2.1 High-Entropy Alloy

Susceptibility of chloride ion concentration, temperature, and surface roughness on pitting corrosion of CoCrFeNi medium‐entropy alloy

Microstructure and atmospheric oxidation behavior of CrCuFeMnNiCox high‐entropy alloys fabricated by vacuum hot‐press sintering

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Microstructure and corrosion behavior of FeCrNiMnMo_x high‐entropy alloys fabricated by the laser surface remelting

Microstructure and atmospheric oxidation behavior of CrCuFeMnNiCo_x high‐entropy alloys fabricated by vacuum hot‐press sintering