Microstructure and Wear Behavior of the High‐Velocity‐Oxygen‐Fuel Sprayed and Spark Plasma Sintered High‐Entropy Alloy AlCrFeCoNi

Löbel, Martin; Lindner, T.; Clauss, S.; Pippig, Robert; Dietrich, D.; Lampke, Thomas

doi:10.1002/adem.202001253

Cited by 30 publications

(9 citation statements)

References 25 publications

(20 reference statements)

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“…Besides the chemical composition, the production conditions have shown a distinct influence on the phase formation and properties. High cooling rates resulted in the suppression of additional phases for the equimolar alloy AlCrFeCoNi (Ref 6,7).…”

Section: Introductionmentioning

confidence: 99%

Influence of Aluminum and Molybdenum on the Microstructure and Corrosion Behavior of Thermally Sprayed High-Entropy Alloy Coatings

et al. 2021

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High-entropy alloys (HEAs) have shown a wide range of promising structural and functional properties. By the application of coating technology, an economical exploitation can be achieved. The high wear and corrosion resistance of HEAs make them particularly interesting for the application as protective coatings. Especially for alloys with a high chromium content, a high corrosion resistance has been revealed. For the current investigations, the equimolar HEA CrFeCoNi with a single-phase face centered cubic structure is considered as a base alloy system. To increase the corrosion resistance as well as the hardness and strength, the influence of the alloying elements aluminum and molybdenum is analyzed. For the current investigations, the high kinetic process high-velocity oxygen fuel thermal spraying (HVOF) has been considered to produce coatings with a low porosity and oxide content. Feedstock is produced by inert gas atomization. The influence of the alloy composition on the microstructure, phase formation and resulting property profile is studied in detail. A detailed analysis of the corrosion resistance and underlying mechanisms is conducted. The pitting and passivation behavior are investigated by potentiodynamic polarization measurements in NaCl and H2SO4 electrolyte. A distinct improvement of the corrosion resistance can be achieved for the alloy Al0.3CrFeCoNiMo0.2.

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Section: Introductionmentioning

confidence: 99%

Influence of Aluminum and Molybdenum on the Microstructure and Corrosion Behavior of Thermally Sprayed High-Entropy Alloy Coatings

et al. 2021

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“…M 2 B, MB, and Mn 3 B 4 type borides were formed on the surface of HEA, and the surface hardness reached 2000~2500 Hv 0.1 . Most studies are focused on the microstructure and mechanical properties of borided bulk HEAs after boriding, but there are few reports on the boronizing mechanism of HEA [ 26 , 27 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Boronizing on the Microstructure and Mechanical Properties of CoCrFeNiMn High-Entropy Alloy

Ouyang

Yin

et al. 2023

Materials

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The CoCrFeNiMn high-entropy alloys were treated by powder-pack boriding to improve their surface hardness and wear resistance. The variation of boriding layer thickness with time and temperature was studied. Then, the frequency factor D0 and diffusion activation energy Q of element B in HEA are calculated to be 9.15 × 10−5 m2/s and 206.93 kJ/mol, respectively. The diffusion behavior of elements in the boronizing process was investigated and shows that the boride layer forms with the metal atoms diffusing outward and the diffusion layer forms with the B atoms diffusing inward by the Pt-labeling method. In addition, the surface microhardness of CoCrFeNiMn HEA was significantly improved to 23.8 ± 1.4 Gpa, and the friction coefficient was reduced from 0.86 to 0.48~0.61.

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“…Among common coating techniques, thermal sprayed coatings, especially high-velocity oxygen fuel (HVOF) sprayed coatings, are characterized by these coating properties [8,9]. It is also well known from our own previous studies [10][11][12][13][14][15] that HVOF is promising for applying dense and high wear-resistant HEA coatings. To further improve the wear resistance of HVOF-HEA coatings, additional alloying elements can be added to provide high hardness or form hard secondary phases [16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Nb and Mo Influencing the High-Temperature Wear Behavior of HVOF-Sprayed High-Entropy Alloy Coatings

2022

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To qualify high-entropy alloys (HEAs) as resource-saving and high-temperature wear-resistant coating materials, high-velocity oxygen fuel (HVOF) coatings produced from the inert gas-atomized powder of Al0.3CrFeCoNi, Al0.3CrFeCoNiNb0.5 and Al0.3CrFeCoNiMo0.75 were investigated in reciprocating wear tests at temperatures at 25, 500, 700 and 900 °C. In addition to the high-temperature wear tests, the microstructure and chemical composition of the three HEAs were analyzed using scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD). In particular, HVOF coatings are characterized by high hardness (Vickers hardness HV0.1) and low porosity, which were also determined. After high-temperature wear tests, the wear depth was measured using laser scanning microscopy (LSM). It was found that adding Nb and Mo to Al0.3CrFeCoNi significantly reduces the wear depth with increasing temperature. The wear mechanisms change from abrasive wear and delamination (25 °C and 500 °C) to a combination of (abrasion), delamination, adhesion and oxidative wear. Thereby, oxidative wear will be the primary mechanism at 900 °C for all the HVOF coatings investigated. The most important finding is that the adhesion of the oxide layer formed is improved by adding Nb and Mo, resulting in significantly reduced wear depth at 900 °C.

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Microstructure and Wear Behavior of the High‐Velocity‐Oxygen‐Fuel Sprayed and Spark Plasma Sintered High‐Entropy Alloy AlCrFeCoNi

Cited by 30 publications

References 25 publications

Influence of Aluminum and Molybdenum on the Microstructure and Corrosion Behavior of Thermally Sprayed High-Entropy Alloy Coatings

Influence of Aluminum and Molybdenum on the Microstructure and Corrosion Behavior of Thermally Sprayed High-Entropy Alloy Coatings

Effect of Boronizing on the Microstructure and Mechanical Properties of CoCrFeNiMn High-Entropy Alloy

Nb and Mo Influencing the High-Temperature Wear Behavior of HVOF-Sprayed High-Entropy Alloy Coatings

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