A novel intermediate temperature self-lubricating CoCrCu1-xFeNix high entropy alloy fabricated by direct laser cladding

Moghaddam, Ahmad Ostovari; Самодурова, М. Н.; Pashkeev, Kirill; Doubenskaia, M.; Sova, A.; Trofimov, Evgeny

doi:10.1016/j.triboint.2021.106857

Cited by 48 publications

(17 citation statements)

References 44 publications

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“…The formation of the hard phase such as B2 [ 55,56 ] and σ‐phase contributed to improved wear resistance and mechanical properties, and experimental results confirmed the same terms of wear depth at 900 °C in the AlCoCrFeNiTi 0.5 HVOF coatings, which was lower than 650 and 800 °C. The formation of different kinds of oxides (Cu 2 O, CuO, Fe 2 O 3 , FeO, Fe 3 O 4 , Cr 2 O 5 , CoCrO 4 , NiCrO 4 , NiO 2 , and Co 3 O 4 ) on the worn surface of laser‐clad CoCrCu1‐ x FeNi x ( x = 0, 0.1, 0.3, and 0.5) HEA coating was reported by Ostovari Moghadam et al [ 5 ] The formation of Cu 2 O, CuO, [ 5 ] AgCrO 2 , and Ag 2 MoO 4 [ 148 ] oxides acted as protective layers during sliding and resulted in the reduction of wear rate and friction coefficient at intermediate temperature (400 °C), according to a proper lubricant role.…”

Section: High‐temperature Wear Characteristics Of Heasmentioning

confidence: 93%

“…[23,101] Figure 8b2 indicates the discontinuous tribo-oxide layer and the high PDZ widths due to the FCC phase and coarse grain, which increased wear rate at high temperatures. [23] Figure 8b3 depicts the presence of undesirable oxides such as Fe 2 O 3 [5] and TiO [101] that have weak adhesive properties on worn surface, low density, and high voids, which have poor wear performance at high temperatures.…”

Section: Oxidativementioning

confidence: 99%

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A Study on Outstanding High‐Temperature Wear Resistance of High‐Entropy Alloys

2023

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Wear property is a main reason for failure, especially for those parts which are mechanically moving and interacting with each other in industrial utilization. High‐entropy alloys (HEAs) are considered promising candidates to possess outstanding tribological factors of performance at high temperatures compared with conventional engineering alloys, which have drawn much attention from academic and industrial points of view. This study is performed to survey the influence of microstructure, grain size, precipitation, reinforcement, and elements addition on the wear resistance of HEAs over a wide temperature range. In this respect, the worn microstructure, wear rate, friction coefficient, hardness, wear track, and subsurface are precisely checked. This review also explores the high‐temperature wear resistance of thermally sprayed and additively manufactured HEAs associated with emphasizing the dominant wear mechanisms through in a wide range of temperatures.

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Section: High‐temperature Wear Characteristics Of Heasmentioning

confidence: 93%

Section: Oxidativementioning

confidence: 99%

A Study on Outstanding High‐Temperature Wear Resistance of High‐Entropy Alloys

2023

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“…Moghaddam et al used the direct laser deposition to prepare the CoCrCu 1− x FeNi x HEA coatings ( x = 0, 0.1, 0.3, and 0.5 wt%) on the Q235 steel. [ 42 ] The COF and wear rate of the coatings with different Ni contents are shown in Figure . The COF first decreased and then increased with the increasing Ni content, but all coatings showed a lower COF at 400 °C than at RT (Figure 7a).…”

Section: The Tribological Performances Of Heas Under High‐temperature...mentioning

confidence: 99%

A Review on the Tribological Performances of High‐Entropy Alloys

Chen

Zhu

2022

Adv Eng Mater

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Wear is an important form of material loss and failure, and it is usually inevitable in almost all mechanical systems with moving parts. The durability and reliability of engineering components are closely related to their wear resistance. Developing advanced materials to alleviate energy and materials losses in moving mechanical systems still remains a great challenge nowadays. The emergence of novel high‐entropy alloys (HEAs) that compose of multiple principal elements holds great promise for the development of materials with extraordinary wear resistance, due to their high hardness, high wear resistance, and excellent corrosion resistance. Herein, the current research progress of the tribology of HEAs under different conditions is reviewed, including high temperature, dry condition, corrosion solution, and oil lubrication. Specifically, the effects of compositions, microstructures, lubricants, and protective oxide layers on the tribological performance of HEAs are summarized. Furthermore, the underlying mechanisms that are responsible for the excellent wear resistance of HEAs under different conditions are discussed. Finally, the current challenges and the future outlooks are emphasized and addressed systematically. In view of the excellent tribological performances and the diversity of compositional design, HEAs have great potential to be applied in a wide range of mechanical systems to minimize wear.

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“…Alloys consisting of five or more components in an equimolar ratio to achieve maximum mixing entropy were first studied by Cantor and Yeh in 2004 [ 1 , 2 ] and were called “high entropy alloys” (HEAs). Such alloys based on transition metals of the Fe subgroup (in particular, of the Al x CoCrFeNi type) demonstrate a unique combination of mechanical characteristics [ 3 , 4 ]; further studies showed their excellent tribological properties [ 5 , 6 ] and high corrosion resistance [ 7 , 8 ].…”

Section: Introductionmentioning

confidence: 99%

Al0.25CoCrFeNiV High Entropy Alloy Coating Deposited by Laser Cladding on Stainless Steel

et al. 2022

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This paper studies the microstructure, composition and properties of a Al0.25CoCrFeNiV high entropy alloy coating (HEAC) deposited by laser cladding on austenitic-grade stainless steel. Laser cladding was carried out in an argon atmosphere on a FL-Clad-R-4 laser metal deposition complex with the following parameters: the laser power was 1400 W, the spot diameter was 3 mm, the track displacement was 1.2 mm, and the scanning speed was set to 10 mm/s. A change in the microstructure of the coating after laser cladding was revealed in comparison with as-cast high entropy alloy (HEA) Al0.25CoCrFeNiV. A significant decrease was found in the size of vanadium precipitates, from 20–40 µm in the as-cast state to 1–3 µm after laser cladding. A change in microhardness over the thickness of the coating from 370 HV0.3 at the outer surface to 270 HV0.3 at the boundary with the substrate was established, which may be due to the diffusion of Fe from the stainless steel into the coating material during laser cladding. Despite these features, the resulting coating adheres tightly to the substrate, and has no cracks or other defects, which indicates the possibility of using laser cladding to create coatings from high entropy alloys.

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A novel intermediate temperature self-lubricating CoCrCu1-xFeNix high entropy alloy fabricated by direct laser cladding

Cited by 48 publications

References 44 publications

A Study on Outstanding High‐Temperature Wear Resistance of High‐Entropy Alloys

A Study on Outstanding High‐Temperature Wear Resistance of High‐Entropy Alloys

A Review on the Tribological Performances of High‐Entropy Alloys

Al0.25CoCrFeNiV High Entropy Alloy Coating Deposited by Laser Cladding on Stainless Steel

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