Mechanically Alloyed CoCrFeNiMo0.85 High-Entropy Alloy for Corrosion Resistance Coatings

Geambazu, Laura Elena; Cotruț, Cosmin M.; Miculescu, Florin; Csáki, Ioana

doi:10.3390/ma14143802

Cited by 13 publications

(12 citation statements)

References 25 publications

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“…From the previous analyses performed on cross-sections taken from the coated areas, it was observed that the micro cracks and pores were present on the surface of the sample, with the structure not being affected [12]. From the previous analyses performed on cross-sections taken from the coated areas, it was observed that the micro cracks and pores were present on the surface of the sample, with the structure not being affected [12].…”

Section: Resultsmentioning

confidence: 96%

“…In order to produce the CoCrFeNiMo 0.85 high-entropy coatings, the consolidated sample was machined into electrodes as presented in our previous research [12] and the coating process was conducted by using Spark Depo Model 300 (Fujieda-shi, Shizuoka-ken, Japan) electrospark deposition equipment with a miniature applicator. The shape and size of the electrodes was decided accordingly to the equipment applicator.…”

Section: Methodsmentioning

confidence: 99%

“…CoCrFeNiMo system, produced from a liquid [11] and solid state [12]. The alloys were tested in corrosive media and the results published [12,13].…”

Section: Introductionmentioning

confidence: 99%

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Economic Efficiency of High-Entropy Alloy Corrosion-Resistant Coatings Designed for Geothermal Turbine Blades: A Case Study

et al. 2022

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The aim of this paper is to establish the cost-effectiveness of high-entropy alloy coatings, using the electrospark deposition technique, designed for a geothermal turbine blade’s leading edge. The deposition of materials with high resistance to corrosion and erosion aims to increase the blade’s service life, reduce maintenance costs and improve production efficiency. According to our previous research on the CoCrFeNiMox high-entropy alloy system, the results showed a high corrosion resistance when in bulk or as a coating, and when tested in geothermal steam and in a saline solution. Based on the results, the high-entropy alloy was subjected to further analyses. The paper focused on two aspects of the research. The first direction was to explore the possibility of obtaining an effective, protective high-entropy alloy layer by the electrospark deposition method. To this end, various tests were performed to demonstrate that the new material possesses superior properties and is suitable for the geothermal environment’s demands. The second direction was to calculate the economic efficiency of coating the areas intensely subjected to wear, based on reports published by the geothermal power plants’ representatives. The final costs were compared with the commercially available equipment parts, and also with the general maintenance costs. From the calculation of the cost efficiency for the CoCrFeNiMo0.85 high-entropy alloy, it resulted that the deposition method and the properties of the material are suitable for the operating conditions, representing an efficient and easy to apply solution to reduce maintenance costs in the geothermal industry.

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Section: Resultsmentioning

confidence: 96%

Section: Methodsmentioning

confidence: 99%

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Economic Efficiency of High-Entropy Alloy Corrosion-Resistant Coatings Designed for Geothermal Turbine Blades: A Case Study

et al. 2022

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“…The XRD results showed increases in μ and σ phases for the ESD-coated HEA, along with FCC and BCC phases. The microstructure of HEAs revealed that the coated HEA exhibited some pores and splats, as shown in the figure [31]. The coated HEA was homogeneous, uniform, and adhesive.…”

Section: Preparation Of Heas By Mechanical Alloyingmentioning

confidence: 93%

An Overview of High-Entropy Alloys Prepared by Mechanical Alloying Followed by the Characterization of Their Microstructure and Various Properties

Rajendrachari

2022

Alloys

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Some modern alloys, such as high-entropy alloys (HEAs), are emerging with greater acceleration due to their wide range of properties and applications. HEAs can be prepared from many metallurgical operations, but mechanical alloying is considered to be one of the most simple, economical, popular, and suitable methods due to its increased solid solubility, nano-crystalline structure, greater homogeneity, and room-temperature processing. Mechanical alloying followed by the consolidation of HEAs is crucial in determining the various surface and mechanical properties. Generally, spark plasma sintering (SPS) methods are employed to consolidate HEAs due to their significant advantages over other conventional sintering methods. This is one of the best sintering methods to achieve greater improvements in their properties. This review discusses the mechanical alloying of various HEAs followed by consolidation using SPS, and also discusses their various mechanical properties. Additionally, we present a brief idea about research publications in HEA, and the top 10 countries that have published research articles on HEAs. From 2010 to 18 April 2022, more than 7700 Scopus-indexed research articles on all the fields of HEA and 130 research articles on HEA prepared by mechanical alloying alone have been published.

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“…Al 0.1 CoCrFeNi alloy showed higher polarization resistance and lower corrosion rate in a molten Na 2 SO 4 -NaCl eutectic mixture at 750 ± 5 • C when compared with nickel-based alloy 718 [21]. CoCrFeNiMo 0.85 alloy used as a coating layer on stainless steel substrate could provide corrosion resistance in 3.5% NaCl solution [22].…”

Section: Introductionmentioning

confidence: 94%

Microstructures of FeCoNiMo and CrFeCoNiMo Alloys, and the Corrosion Properties in 1 M Nitric Acid and 1 M Sodium Chloride Solutions

Tsau

Tsai

2022

Materials

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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.

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Mechanically Alloyed CoCrFeNiMo0.85 High-Entropy Alloy for Corrosion Resistance Coatings

Cited by 13 publications

References 25 publications

Economic Efficiency of High-Entropy Alloy Corrosion-Resistant Coatings Designed for Geothermal Turbine Blades: A Case Study

Economic Efficiency of High-Entropy Alloy Corrosion-Resistant Coatings Designed for Geothermal Turbine Blades: A Case Study

An Overview of High-Entropy Alloys Prepared by Mechanical Alloying Followed by the Characterization of Their Microstructure and Various Properties

Microstructures of FeCoNiMo and CrFeCoNiMo Alloys, and the Corrosion Properties in 1 M Nitric Acid and 1 M Sodium Chloride Solutions

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