Microstructures and properties of high-entropy alloy films and coatings: a review

Li, Wei; Liu, Ping; Liaw, Peter K.

doi:10.1080/21663831.2018.1434248

Cited by 424 publications

(101 citation statements)

References 182 publications

(286 reference statements)

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“…The investigation results of the hardness of the coatings indicate that a significant increase in hardness is observed with nanoscale thickness of the layers, which is achieved with continuous rotation of the substrate. This can be attributed to the size effect [5]. In addition, an increase in the partial pressure of nitrogen during coating deposition also leads to an increase in the nitrogen content in the coatings and, as a consequence, to an increase in the hardness of the coatings [6].…”

Section: Resultsmentioning

confidence: 99%

Structure and Physicomechanical Properties of Superhard Multicomponent Multilayer (TiAlСrY/Zr)/(TiAlСrYN/ZrN) Coatings with Double Modulation Period of the Structure

Novikov¹,

Beresnev²,

Kolesnikov³

et al. 2019

J. Nano- Electron. Phys.

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The paper describes the acquisition, establishment of mechanisms and patterns of formation of the phase composition and structure of multilayer coatings of the (TiAlСrY)N/ZrN system with a single and of the (TiAlCrY/Zr)/(TiAlСrY)N/ZrN systems with a double modulation period by vacuum-arc deposition. The targets were located along one straight line at equal distances from the perpendicular axis on which the substrates were placed. The rotation of the axis with the substrates was carried out either continuously or with a fixed delay at the evaporators. The coatings of both systems are distinguished by a high degree of laminarity of the layers. The (TiAlСrY)N/ZrN system coatings have a pronounced layered periodic structure in the entire coating volume. The modulation period (total thickness of the bilayer) of such a structure is about 30 nm. Two modulation periods are clearly visible in the (TiAlCrY/Zr)/(TiAlCrYN/ZrN) system coatings. One period approximately coincides with the modulation period of the samples of the (TiAlCrY/Zr)N system and is about 30 nm. The second modulation period is about 1.3 microns. It includes 48 bilayers. The influence of the partial pressure of nitrogen in the chamber on the nitrogen content in the coatings, their hardness and adhesive strength were studied. A significant increase in the hardness of 68.22 GPa and the adhesion strength of the coatings with a double modulation period of the structure was revealed. A fundamentally new technological approach to the process of obtaining multilayer coatings has been proposed.

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Section: Resultsmentioning

confidence: 99%

Structure and Physicomechanical Properties of Superhard Multicomponent Multilayer (TiAlСrY/Zr)/(TiAlСrYN/ZrN) Coatings with Double Modulation Period of the Structure

Novikov¹,

Beresnev²,

Kolesnikov³

et al. 2019

J. Nano- Electron. Phys.

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“…Application of protective coatings may bring an increase of corrosion and chemical resistance [66,67], increase of working temperature of the products [68], improved wear resistance [69,70] and, thus, longer lifetime of the product. Very high interest nowadays is on multi-layered structures [71][72][73] and high entropy alloy (HEA) coatings [73,74].…”

Section: Protective Coatingsmentioning

confidence: 99%

Hybrid additive manufacturing of steels and alloys

Popov

Fleisher

2020

Manufacturing Rev.

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Hybrid additive manufacturing is a relatively modern trend in the integration of different additive manufacturing techniques in the traditional manufacturing production chain. Here the AM-technique is used for producing a part on another substrate part, that is manufactured by traditional manufacturing like casting or milling. Such beneficial combination of additive and traditional manufacturing helps to overcome well-known issues, like limited maximum build size, low production rate, insufficient accuracy, and surface roughness. The current paper is devoted to the classification of different approaches in the hybrid additive manufacturing of steel components. Additional discussion is related to the benefits of Powder Bed Fusion (PBF) and Direct Energy Deposition (DED) approaches for hybrid additive manufacturing of steel components.* e-mail: vvp@technion.ac.il Rev. 7, 6 (2020) This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Manufacturing

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“…HEAs are a high-entropy solid-solution phase alloy formed by five or more principal elements, each of which has an atomic concentration between 5-35 at.% (atomic percent). The HEAs are not inclined to form intermetallic compounds due to their high-entropy effect, which tend to stabilize the simple body-centered-cubic (BCC), face-centered-cubic (FCC), or hexagonal-close-packed (HCP) solid solution [7][8][9][10][11][12]. A large number of subsequent studies have shown that HEAs have many superior properties than conventional alloys, such as the high strength, great hardness, strong wear resistance, good fatigue resistance, high oxidation and corrosion resistance [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Effects of Silicon Content on the Microstructures and Mechanical Properties of (AlCrTiZrV)-Six-N High-Entropy Alloy Films

Niu

Liu

et al. 2019

Entropy

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A series of (AlCrTiZrV)-Six-N films with different silicon contents were deposited on monocrystalline silicon substrates by direct-current (DC) magnetron sputtering. The films were characterized by the X-ray diffractometry (XRD), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), and nano-indentation techniques. The effects of the silicon content on the microstructures and mechanical properties of the films were investigated. The experimental results show that the (AlCrTiZrV)N films grow in columnar grains and present a (200) preferential growth orientation. The addition of the silicon element leads to the disappearance of the (200) peak, and the grain refinement of the (AlCrTiZrV)-Six-N films. Meanwhile, the reticular amorphous phase is formed, thus developing the nanocomposite structure with the nanocrystalline structures encapsulated by the amorphous phase. With the increase of the silicon content, the mechanical properties first increase and then decrease. The maximal hardness and modulus of the film reach 34.3 GPa and 301.5 GPa, respectively, with the silicon content (x) of 8% (volume percent). The strengthening effect of the (AlCrTiZrV)-Six-N film can be mainly attributed to the formation of the nanocomposite structure.

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Microstructures and properties of high-entropy alloy films and coatings: a review

Cited by 424 publications

References 182 publications

Structure and Physicomechanical Properties of Superhard Multicomponent Multilayer (TiAlСrY/Zr)/(TiAlСrYN/ZrN) Coatings with Double Modulation Period of the Structure

Structure and Physicomechanical Properties of Superhard Multicomponent Multilayer (TiAlСrY/Zr)/(TiAlСrYN/ZrN) Coatings with Double Modulation Period of the Structure

Hybrid additive manufacturing of steels and alloys

Effects of Silicon Content on the Microstructures and Mechanical Properties of (AlCrTiZrV)-Six-N High-Entropy Alloy Films

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