Plasma-Sprayed High Entropy Alloys: Microstructure and Properties of AlCoCrFeNi and MnCoCrFeNi

Ang, Andrew Siao Ming; Berndt, C. C.; Sesso, Mitchell L.; Anupam, Ameey; Sathiyamoorthi, Praveen; Kottada, Ravi Sankar; Murty, B.S.

doi:10.1007/s11661-014-2644-z

Cited by 157 publications

(39 citation statements)

References 25 publications

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“…This approach can help to save costs and resources, as HEAs and CCAs usually contain expensive and rare alloying elements such as cobalt. First investigations to produce HEA/CCA coatings by thermal spray have already been carried out [19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Wear Resistance of AlCoCrFeNiTi High-Entropy Alloy Coatings Produced by HVOF

et al. 2017

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The investigation of high-entropy alloys (HEAs) has revealed many promising properties. HEAs with a high share of Al and Ti are suitable for the formation of lightweight materials. Investigations of the alloy system AlCoCrFeNiTi showed high strength, hardness, ductility, and wear resistance, which makes this special alloy interesting for surface engineering and particularly for thermal spray technology. In this study, the suitability of inert gas-atomised HEA powder for high-velocity-oxygen-fuel (HVOF) thermal spray is investigated. This process allows for high particle velocities and comparatively low process temperatures, resulting in dense coatings with a low oxidation. The microstructure and phase composition of the atomised powder and the HVOF coating were investigated, as well as the wear behaviour under various conditions. A multiphase microstructure was revealed for the powder and coating, whereas a chemically ordered bcc phase occurred as the main phase. The thermal spray process resulted in a slightly changed lattice parameter of the main phase and an additional phase. In comparison with a hard chrome-plated sample, an increase in wear resistance was achieved. Furthermore, no brittle behaviour occurred under abrasive load in the scratch test. The investigation of wear tracks showed only minor cracking and spallation under maximum load.

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Section: Introductionmentioning

confidence: 99%

Microstructure and Wear Resistance of AlCoCrFeNiTi High-Entropy Alloy Coatings Produced by HVOF

et al. 2017

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“…11 Apart from bulk material consolidation methods such as casting and sintering, HEAs can also be deposited as a surface coating. Various techniques of welding, 9,12 thermal spraying, 13 selective laser melting, 14 direct laser deposition 8,[15][16][17][18] and additive manufacturing [19][20][21][22] are already reported in the literature as experimental methods to produce HEA coatings.…”

Section: Introductionmentioning

confidence: 99%

Additive Manufacturing of High-Entropy Alloys by Laser Processing

Ocelík

Janssen

Smith

et al. 2016

JOM

129

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This contribution concentrates on the possibilities of additive manufacturing of high-entropy clad layers by laser processing. In particular, the effects of the laser surface processing parameters on the microstructure and hardness of high-entropy alloys (HEAs) were examined. AlCoCrFeNi alloys with different amounts of aluminum prepared by arc melting were investigated and compared with the laser beam remelted HEAs with the same composition. Attempts to form HEAs coatings with a direct laser deposition from the mixture of elemental powders were made for AlCoCrFeNi and AlCrFeNiTa composition. A strong influence of solidification rate on the amounts of face-centered cubic and bodycentered cubic phase, their chemical composition, and spatial distribution was detected for two-phase AlCoCrFeNi HEAs. It is concluded that a high-power laser is a versatile tool to synthesize interesting HEAs with additive manufacturing processing. Critical issues are related to the rate of (re)solidification, the dilution with the substrate, powder efficiency during cladding, and differences in melting points of clad powders making additive manufacturing processing from a simple mixture of elemental powders a challenging approach.

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“…The increase in erosion rate at normal impingement was attributed to the brittle intermetallic σ and B2 phases. Lowest erosion rate observed for the equimolar AlCrCoFeNi CCA coating at both acute angles and normal impingement was attributed to the Complex concentrated alloy coatings have also been studied for their erosion behavior [28,45,[78][79][80][81]. Al x CrCoFeNi (x = 0.1 to 3) CCA coatings were developed using microwave processing on SS316L steel substrate, with microstructure consisting of intermetallic phases, as shown in Figure 22 [82].…”

Section: Erosion and Erosion Corrosion Of Ccasmentioning

confidence: 99%

Corrosion, Erosion and Wear Behavior of Complex Concentrated Alloys: A Review

Ayyagari

Hasannaeimi

Grewal

et al. 2018

Metals

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There has been tremendous interest in recent years in a new class of multi-component metallic alloys that are referred to as high entropy alloys, or more generally, as complex concentrated alloys. These multi-principal element alloys represent a new paradigm in structural material design, where numerous desirable attributes are achieved simultaneously from multiple elements in equimolar (or near equimolar) proportions. While there are several review articles on alloy development, microstructure, mechanical behavior, and other bulk properties of these alloys, then there is a pressing need for an overview that is focused on their surface properties and surface degradation mechanisms. In this paper, we present a comprehensive view on corrosion, erosion and wear behavior of complex concentrated alloys. The effect of alloying elements, microstructure, and processing methods on the surface degradation behavior are analyzed and discussed in detail. We identify critical knowledge gaps in individual reports and highlight the underlying mechanisms and synergy between the different degradation routes.

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Plasma-Sprayed High Entropy Alloys: Microstructure and Properties of AlCoCrFeNi and MnCoCrFeNi

Cited by 157 publications

References 25 publications

Microstructure and Wear Resistance of AlCoCrFeNiTi High-Entropy Alloy Coatings Produced by HVOF

Microstructure and Wear Resistance of AlCoCrFeNiTi High-Entropy Alloy Coatings Produced by HVOF

Additive Manufacturing of High-Entropy Alloys by Laser Processing

Corrosion, Erosion and Wear Behavior of Complex Concentrated Alloys: A Review

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