Influence of laser re-melting and vacuum heat treatment on plasma-sprayed FeCoCrNiAl alloy coatings

Lin, Danyang; Zhang, Nannan; He, Bin; Jin, Bingqian; Zhang, Yue; Li, Deyuan; Dong, Fuyu

doi:10.1016/s1006-706x(18)30018-9

Cited by 35 publications

(12 citation statements)

References 31 publications

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“…Due to the high plasma jet temperatures, in-flight oxidation occurs in the APS process leading to peaks of mixed spinel oxides, marked as ♠, AB 2 O 4 (A = Ni/Co/Fe, B = Al/Cr) were also detected [32]. All the diffraction peaks correspond well with the already published work [33]. Major peaks representing the BCC and FCC are found to be present.…”

Section: Phase Analysissupporting

confidence: 80%

“…Major peaks representing the BCC and FCC are found to be present. Some of the diffraction peaks are slightly shifted in comparison to already published work on this alloy system because of the difference in amounts of solid solution formation due to a difference in the atomic radii of Ni, Fe, Cr, Al, and Co. All the diffraction peaks correspond well with the already published work [33]. Major peaks representing the BCC and FCC are found to be present.…”

Section: Phase Analysissupporting

confidence: 77%

“…After an annealing treatment at 1000 • C, the content of Cr-O increased in the coatings while the presence of metals in their pure form was minimized, similarly found by Lin et al [33]. In the case of annealing treatment, the following changes were observed; an increase in intensity at 2θ: 37.16 • , the peak at 2θ: 38 • for spinel changed to FCC with an increased intensity which may be attributed to solid solution FCC lattices, and peak broadening took place at 2θ: 44.16 • which indicates the presence of fine structure and appeared as FCC, BCC and spinel after annealing.…”

Section: Phase Analysissupporting

confidence: 75%

“…Due to the effects of heat treatment, elemental diffusion took place to a larger extent sufficiently which enhanced the entropy of our system significantly and restricted the formation of the intermetallic compounds which are the ordered phases. The increase in the entropy of the system reduced the free energy of the alloy system thus, making stable solid solutions [31,33]. It was revealed that BCC and FCC exist as the major phases present in the coating structure.…”

Section: Phase Analysismentioning

confidence: 99%

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Microstructure and Corrosion Behavior of Atmospheric Plasma Sprayed NiCoCrAlFe High Entropy Alloy Coating

Mehmood¹,

Umer²,

Munawar³

et al. 2022

Materials

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High entropy alloys (HEAs) are multi-elemental alloy systems that exhibit a combination of exceptional mechanical and physical properties, and nowadays are validating their potential in the form of thermal sprayed coatings. In the present study, a novel synthesis method is presented to form high entropy alloy coatings. For this purpose, thermal sprayed coatings were deposited on Stainless Steel 316L substrates using atmospheric plasma spraying technique with subsequent annealing, at 1000 °C for 4 h, to assist alloy formation by thermal diffusion. The coatings in as-coated samples as well as in annealed forms were extensively studied by SEM for microstructure and cross-sectional analysis. Phase identification was performed by X-ray diffraction studies. The annealed coatings revealed a mixed BCC and FCC based HEA structure. Potentiodynamic corrosion behavior of SS316L sprayed as well as annealed coatings were also carried out in 3.5% NaCl solution and it was found that the HEA-based annealed coatings displayed the best corrosion resistance 0.83 (mpy), as compared to coated/non-annealed and SS 316 L that showed corrosion resistance of 7.60 (mpy) and 3.04 (mpy), respectively.

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Section: Phase Analysissupporting

confidence: 80%

Section: Phase Analysissupporting

confidence: 77%

Section: Phase Analysissupporting

confidence: 75%

Section: Phase Analysismentioning

confidence: 99%

See 2 more Smart Citations

Microstructure and Corrosion Behavior of Atmospheric Plasma Sprayed NiCoCrAlFe High Entropy Alloy Coating

Mehmood¹,

Umer²,

Munawar³

et al. 2022

Materials

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“…Additionally, the improvement on the feedstock density and particle shape will result in good powder flowability and desirable coating microstructure. Internal oxidation was found during both the oxidation tests, which is unfavorable for oxidation resistance and coating longevity, therefore, the coating quality should be further improved by optimizing feedstock materials, process parameters, and post-treatment such as annealing and laser remelting as reviewed in literatures [25][26][27][28].…”

Section: Thermal Cycling Testmentioning

confidence: 99%

Evaluation of New High Entropy Alloy as Thermal Sprayed Bondcoat in Thermal Barrier Coatings

Ruggiero

Bhattacharya

et al. 2021

J Therm Spray Tech

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High-entropy alloys (HEAs) have great potential to be used as high-temperature materials and in coating material applications due to their combination of strength, ductility, thermal stability, wear, and oxidation resistance. In this work, a new HEA alloy based on NiCoCrAlSi composition was designed and deposited into metallic coatings by high-velocity oxy-fuel (HVOF) and air plasma spray (APS) processes, with the aim of developing new HEA bondcoats for thermal barrier coating (TBC) systems. The HEA coatings were analyzed for phases, microstructure and composition using X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersive spectroscopy (EDS). The results showed that the BCC phase is the major phase present in the as-applied HVOF coating that was vacuum diffusion treated at 1080 °C. APS coatings of the same composition HEA alloy showed a two-phase structure consisting of the L12 and BCC/B2 phases. The HEA bondcoats produced by HVOF were tested for oxidation resistance at 1050 °C in air, and for thermal cycling resistance of the TBC comprising of the HVOF-applied HEA bondcoat and standard 8YSZ ceramic topcoat. The results showed internal oxidation in the HEA bondcoat during the high-temperature oxidation exposure, but no significant coating failure after 100 thermal cycles at 1150 °C.

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Recent Progress in High‐Entropy Alloy Electrocatalysts for Hydrogen Evolution Reaction

Wang,

Xie,

Qin

et al. 2024

Adv Materials Inter

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High‐entropy alloys (HEAs) materials, as promising nanomaterials, have garnered significant attention from researchers due to their excellent performance in the field of hydrogen evolution reaction (HER). The four core effects of HEAs, including the high‐entropy effect, severe lattice distortion effect, sluggish diffusion effect, and cocktail effect, are pivotal in underpinning their remarkable mechanical and thermodynamic properties. Nevertheless, the intricate geometric and electronic structures of HEAs make their catalytic mechanisms exceptionally complex and challenging to decipher. In particular, a thorough analysis of the underlying factors responsible for the outstanding catalytic activity, selectivity, and the ability to maintain stable hydrogen production, even at high current densities, in HEAs is lacking. To provide a systematic exploration of the design and application of HEAs in HER systems, this review commences with an examination of the physicochemical properties of HEAs. It covers a wide range of topics, including the synthesis methods of HEAs, and the major reaction mechanisms of HERs, and presents innovative methods and approaches for designing HEAs specifically in the context of HERs.

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Influence of laser re-melting and vacuum heat treatment on plasma-sprayed FeCoCrNiAl alloy coatings

Cited by 35 publications

References 31 publications

Microstructure and Corrosion Behavior of Atmospheric Plasma Sprayed NiCoCrAlFe High Entropy Alloy Coating

Microstructure and Corrosion Behavior of Atmospheric Plasma Sprayed NiCoCrAlFe High Entropy Alloy Coating

Evaluation of New High Entropy Alloy as Thermal Sprayed Bondcoat in Thermal Barrier Coatings

Recent Progress in High‐Entropy Alloy Electrocatalysts for Hydrogen Evolution Reaction

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