Two-step hydrogen reduction of oxides for making FeCoNiCu high entropy alloy: Part I – Process and mechanical properties

Guo, Xueyi; Liu, Peidong; Yang, Xiaobo; Zhou, Dong; Liu, Hanning; Chen, Yubing

doi:10.1016/j.matchar.2022.112271

Cited by 6 publications

(2 citation statements)

References 41 publications

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“…Several studies indicate that MCA coatings can provide satisfactory protection for ships and ocean engineering, especially in harsh marine environments [23]. There are different methodologies that have been developed for the successful synthesis of MCA coatings, such as laser remelting [24,25], magnetron sputtering [26], laser cladding [27], thermal spraying [28,29], electrochemical reduction of oxides in molten salts [30], mechanical alloying [4], hydrogen reduction of oxide powers [31], and electrochemical deposition [32][33][34]. All these techniques, except for electrodeposition, are labeled as having a high equipment cost, having relatively high operating temperatures and energy consumption, and presenting difficulty in controlling the coating morphology and composition.…”

Section: Introductionmentioning

confidence: 99%

Effect of Additive and Current Density on Microstructures and Corrosion Behavior of a Multi-Component NiFeCoCu Alloy Prepared by Electrodeposition

Wang,

Ma,

et al. 2024

Crystals

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High-entropy alloys (HEAs) have been attracting growing interest for decades due to their unique properties. Electrodeposition provides a low-cost and convenient route for producing classified types of HEAs, compared to other synthesis techniques, making it an attention-grabbing method. However, fabricating high-quality HEAs through electrodeposition in aqueous electrolytes remains a great challenge. In this study, the effects of additives and current densities on the compositions, surface morphologies, microstructures, and corrosion behavior of the electrodeposited NiFeCoCu alloy are studied. The results indicate that saccharin plays a key role in achieving a flat and bright surface for NiFeCoCu coatings, while also relieving the internal stress and improving anti-corrosion properties. Electrodeposition under a current density of 20–40 mA/cm2 results in a uniform and dense deposit with favorable properties. The present work provides a low-cost and feasible industrial solution for the preparation of HEA coatings, which holds great potential for innovation in the field of HEA coatings through electrodeposition.

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Section: Introductionmentioning

confidence: 99%

Effect of Additive and Current Density on Microstructures and Corrosion Behavior of a Multi-Component NiFeCoCu Alloy Prepared by Electrodeposition

Wang,

Ma,

et al. 2024

Crystals

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“…In addition, preparation temperatures of HEA materials by chemical methods are generally lower than those by physical methods, leading to energy savings. It was demonstrated that it was feasible to prepare bulk samples of HEAs, such as CuCoFeNi [21,22] and CoCrFeMnNi [23], from the constituent oxides by hydrogen reduction performed below 1200 • C, and the products showed good mechanical properties. However, it is still an issue to obtain HEAs containing a good mixture of constituent elements by the deoxidation of oxides.…”

Section: Introductionmentioning

confidence: 99%

High-Entropy Alloy Al0.2Co1.5CrFeNi1.5Ti0.5 Prepared from High-Entropy Oxide (Al0.2Co1.5CrFeNi1.5Ti0.5)3O4 by a Deoxidation Process via a CaH2-Assisted Molten Salt Method

Kobayashi,

Yokoyama,

Shoji

2024

Metals

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High-entropy alloys (HEAs) have attracted a great deal of research interest these days because of their attractive properties. Low-temperature chemical synthesis methods are being developed to obtain nanoscale HEAs with low energy consumption. In this study, we prepared HEA Al0.2Co1.5CrFeNi1.5Ti0.5 nanoparticles from high-entropy oxide (HEO) (Al0.2Co1.5CrFeNi1.5Ti0.5)3O4 by a deoxidation process via a CaH2-assisted molten salt method at 600 °C. X-ray diffraction measurements demonstrated that the oxide precursor and the reduced product have single-phases of spinel structure and face-centered cubic structures, indicating the formation of HEO and HEA, respectively. The HEA nanoparticles exhibited superior catalytic performance in the liquid-phase hydrogenation of p-nitrophenol at room temperature with little leaching of the component elements. Scanning electron microscopy (SEM) with energy-dispersive X-ray spectrometry (EDX) exhibited a good distribution of constituent elements over the HEA nanoparticles in a micro-sized range. However, transmission electron microscopy (TEM) with EDX revealed a slight deviation of elemental distributions of Al and Ti from those of Co, Cr, Fe, and Ni in a nano-sized range, probably due to the incomplete reduction of aluminum and titanium oxides. The elemental homogeneity in the HEA nanoparticles could be improved by taking advantage of the HEO precursor with homogeneous elemental distributions, but the experimental results suggested the importance of the total reduction of oxide precursors to prepare homogeneous HEAs from HEOs.

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Microstructure and Mechanical Properties of Fe-36Ni Alloy Prepared by a Two-Step Hydrogen Reduction Process

Liu,

Tian

et al. 2023

JOM

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Two-step hydrogen reduction of oxides for making FeCoNiCu high entropy alloy: Part I – Process and mechanical properties

Cited by 6 publications

References 41 publications

Effect of Additive and Current Density on Microstructures and Corrosion Behavior of a Multi-Component NiFeCoCu Alloy Prepared by Electrodeposition

Effect of Additive and Current Density on Microstructures and Corrosion Behavior of a Multi-Component NiFeCoCu Alloy Prepared by Electrodeposition

High-Entropy Alloy Al0.2Co1.5CrFeNi1.5Ti0.5 Prepared from High-Entropy Oxide (Al0.2Co1.5CrFeNi1.5Ti0.5)3O4 by a Deoxidation Process via a CaH2-Assisted Molten Salt Method

Microstructure and Mechanical Properties of Fe-36Ni Alloy Prepared by a Two-Step Hydrogen Reduction Process

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