In Situ Medium Entropy Intermetallic Reinforced Composite Coating Fabricated by Additive Manufacturing

Moghaddam, Ahmad Ostovari; Shaburova, Nataliya; Самодурова, М. Н.; Latfulina, Yuliya Sergeevna; Mikhailov, Dmitry; Trofimov, Evgeny

doi:10.3390/met11071069

Cited by 7 publications

(4 citation statements)

References 25 publications

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“…According to our XRD analysis, the σ-phase is characterized by a tetragonal crystal lattice with parameters a = 8.816 Ǻ and c = 4.571 Ǻ, which coincides with the results reported by Salishchev et al [28], where the σ-phase is characterized by a tetragonal lattice with parameters that can vary between a = 8.794-8.826 Ǻ and c = 4.566-4.578 Ǻ (depending on the degree of lattice distortion). Moreover, considering the interaction volume of electrons with the sample in EDS analysis (which is about 1 μm [44]), the precise chemical composition of the σ precipitates could not be determined. treatment, peaks related to the fcc solid solution and V-rich bcc phase are visible.…”

Section: X-ray Diffractionmentioning

confidence: 99%

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Effect of Electromagnetic Pulses on the Microstructure and Abrasive Gas Wear Resistance of Al0.25CoCrFeNiV High Entropy Alloy

et al. 2022

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High entropy alloys (HEAs) are among the most promising materials, owing to their vast chemical composition window and unique properties. Segregation is a well-known phenomenon during the solidification of HEAs, which negatively affects their properties. The electromagnetic pulse (EMP) is a new technique for the processing of a metal melt that can hinder segregation during solidification. In this study, the effect of an EMP on the microstructure and surface properties of Al0.25CoCrFeNiV HEA is studied. An EMP, with an amplitude of 10 kV, a leading edge of 0.1 ns, a pulse duration of 1 ns, a frequency of 1 kHz, and pulse power of 4.5 MW, was employed for melt treatment. It was found that the microstructure of Al0.25CoCrFeNiV HEA changes significantly from dendritic, for an untreated sample, to lamellar “pearlite-like”, for an EMP treated sample. Moreover, EMPs triggered the formation of a needle-like σ-phase within the solid solution grains. Finally, these microstructural and compositional changes significantly increased the microhardness of Al0.25CoCrFeNiV HEA, from 343 ± 10 HV0.3 (without the EMP) to 553 ± 15 HV0.3 (after the EMP), and improved its resistance against gas-abrasive wear. Finally, an EMP is introduced as an effective route to modify the microstructure and phase formation of cast HEAs, which, in turn, opens up broad horizons for fabricating cast samples with tailorable microstructures and improved properties.

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Section: X-ray Diffractionmentioning

confidence: 99%

“…(depending on the degree of lattice distortion). Moreover, considering the interaction volume of electrons with the sample in EDS analysis (which is about 1 µm [44]), the precise chemical composition of the σ precipitates could not be determined.…”

Section: X-ray Diffractionmentioning

confidence: 99%

Effect of Electromagnetic Pulses on the Microstructure and Abrasive Gas Wear Resistance of Al0.25CoCrFeNiV High Entropy Alloy

et al. 2022

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“…Although high and medium entropy alloys were initially regarded as single-phase solid solutions with equiatomic composition, nowadays, alloys with non-equiatomic compositions, as well as multiphase alloys and intermetallic compounds are being increasingly investigated. These alloys could exhibit superior high-temperature strength and thermal stability [18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

A Fresh Perspective on Medium Entropy Alloys Applications as Coating and Coating Substrate

Nartita¹,

Ioniță²,

Demetrescu³

et al. 2022

AnnalsARSciPhysChem

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In order to evolve as a society we need increasingly efficient technologies and implicitly materials with great performance that promote safety and sustainability. The discovery of high entropy alloys was received with much enthusiasm due to the possibility of designing new materials with improved properties, that could be used in applications that require extreme conditions or a very specific combination of properties. As the research in this area is continuously increasing and the results are very promising, this review focuses on the most recent investigations on medium entropy alloys (MEAs) applications, highlighting their properties, but taking into consideration other factors, such as economic and environmental factors. Additionally, considering the high cost associated with MEAs fabrication, MEA coatings are also explored, as they are nowadays regarded as a more convenient procedure to obtain the required properties for various substrate materials.

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“…Since the advent of HEAs, the interest in them has only been growing because HEAs, unlike conventional alloys with one or two basic components, feature a unique combination of properties: high strength and ductility [4,5], high mechanical properties at different temperatures [6], high fatigue resistance [7,8], high hardness and wear resistance [9][10][11][12][13][14], and high thermal stability [15,16]. Such properties of HEAs make them attractive as structural materials for operation under severe conditions (in gas turbines, jet and turbojet engines, etc.).…”

Section: Introductionmentioning

confidence: 99%

High-Temperature Oxidation Behavior of AlxCoCrFeNiM (M = Cu, Ti, V) High-Entropy Alloys

et al. 2021

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High-entropy alloys (HEAs) feature a unique combination of mechanical and physical properties, such as high strength and ductility, high hardness and wear resistance, high thermal stability, suggesting that HEAs are suitable for operation under severe conditions (gas turbines, jet and turbojet engines, etc.). In this context, it is reasonable to assess the resistance of HEAs to high-temperature oxidation. Here, we present theoretical and experimental data on the behavior of three HEAs (Al x CoCrFeNiM with M = Cu, Ti, V) oxidized in air at 900°C for 10 h and discuss the possibility of thermodynamic simulation for predicting the composition of their oxidation products. Our study of the microstructure of the test HEAs before and after oxidation, composition of their oxidation products, and oxidation kinetics shows that Al 0.25 CoCrFeNiCu has the highest stability to high-temperature oxidation due to the formation of a protective Al 2 O 3 -rich film on its surface. The oxidation stability of the Ti-and V-doped alloys is rather low and likely because their surface during oxidation is covered with loose layers of transition metal oxides rather with a continuous alumina film.

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In Situ Medium Entropy Intermetallic Reinforced Composite Coating Fabricated by Additive Manufacturing

Cited by 7 publications

References 25 publications

Effect of Electromagnetic Pulses on the Microstructure and Abrasive Gas Wear Resistance of Al0.25CoCrFeNiV High Entropy Alloy

Effect of Electromagnetic Pulses on the Microstructure and Abrasive Gas Wear Resistance of Al0.25CoCrFeNiV High Entropy Alloy

A Fresh Perspective on Medium Entropy Alloys Applications as Coating and Coating Substrate

High-Temperature Oxidation Behavior of AlxCoCrFeNiM (M = Cu, Ti, V) High-Entropy Alloys

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