High entropy alloy thin films of AlCoCrCu0.5FeNi with controlled microstructure

Khan, N. A.; Akhavan, Behnam; Zhou, Haoruo; Chang, Li; Wang, Hongjian; Sun, Lixian; Bilek, M.M.M.; Liu, Zongwen

doi:10.1016/j.apsusc.2019.143560

Cited by 88 publications

(34 citation statements)

References 30 publications

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“…27) can also be suggested to fabricate refractory based HEA coatings over the substrate to improve surface properties of components. A thin layer starting from 1 nm to few hundreds of microns can be deposited through advanced thin-film technology, namely, magnetron sputtering deposition (MSD), pulsed laser deposition (PLD), and plasma spraying deposition (PSD) [81]. HEAs thin-film offers improved properties in aerospace industries where high strength along with superior oxidization and corrosion resistance can be attained.…”

Section: Thin-film Deposition Technologymentioning

confidence: 99%

Manufacturing Methods, Microstructural and Mechanical Properties Evolutions of High-Entropy Alloys: A Review

et al. 2019

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High entropy alloys (HEAs) are being attracted recently by several researchers, scientists, and academicians to achieve extraordinary and outstanding properties that cannot be obtained from conventional alloys. HEAs are multicomponent alloys in which a minimum of five metallic elements are mixed in an equal molar or non-equal molar ratio. The rapid growth of this field produces a huge amount of scientific papers over the last decade. However, still, there is a need to review various manufacturing methods and their results. Also, the outcome of the scientific articles related to HEAs has ignored the various methods of synthesizing and manufacturing. In this review article, an attempt was made and largely concentrated on the methods and techniques that can be used in the manufacturing and synthesizing of the HEAs. Recently, the properties of HEAs become much better when compared to conventional alloys. Some techniques have succeeded in producing ultrafine microstructure grains which become a leap in industrial fields. Now, the manufacturing methods of conventional alloys are almost familiar and implemented according to the suggestions given by the researchers and academicians based on their work. Therefore, the present review article has demonstrated various methods of manufacturing of HEAs with novel schematics with a preview description for more understanding of the basic work criteria. Besides, this article has reviewed the outcomes of several research articles related to several methods, then compared the outcome of each method with the corresponding mechanical properties, and major challenges of HEAs are discussed and reported.

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Section: Thin-film Deposition Technologymentioning

confidence: 99%

Manufacturing Methods, Microstructural and Mechanical Properties Evolutions of High-Entropy Alloys: A Review

et al. 2019

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“…High-entropy alloys (HEAs) [ 1 , 2 , 3 , 4 , 5 , 6 ], with equiatomic or near-equiatomic multicomponent structures, have become widely used in the design and construction of elements that require such mechanical and chemical material characteristics as high strength, resistance to abrasion, good thermal (oxidation) stability, catalytic properties, or corrosion resistance. HEAs found numerous applications in manufacturing a variety of functional industrial devices such as moulds, dies, machinery parts, pipes, pump elements, etc.…”

Section: Introductionmentioning

confidence: 99%

“…Yeh et al [ 2 , 7 , 8 ] indicate that the unique properties of HEAs are a result of four main factors: high entropy, slow diffusion, lattice distortion, and the so-called cocktail effect (even “mixing” of the properties). Due to their high mixing entropy, HEAs tend to form simple solid solution phases of fcc , bcc , or hcp rather than the complex or intermetallic phases [ 5 ]. The unique properties of HEAs have made them a promising material for use also in the form of thin coatings of different functional materials, which additionally expands the prospects of their extensive use [ 4 , 5 , 7 , 8 , 9 , 10 ].…”

Section: Introductionmentioning

confidence: 99%

“…Due to their high mixing entropy, HEAs tend to form simple solid solution phases of fcc , bcc , or hcp rather than the complex or intermetallic phases [ 5 ]. The unique properties of HEAs have made them a promising material for use also in the form of thin coatings of different functional materials, which additionally expands the prospects of their extensive use [ 4 , 5 , 7 , 8 , 9 , 10 ]. High entropy coatings are often composed of such transition metals as Ni, Cr, Co, Ti, or Cu (metals with relatively positive standard electrode potentials or spontaneously passivating in aqueous media).…”

Section: Introductionmentioning

confidence: 99%

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Modification of Hydrogenation and Corrosion Properties of Hydrogen Storage Material by Amorphous TiCrFeCoNi HEA Layer

2022

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The effect of encapsulation of LaNi4.5Co0.5 powdered hydrogen storage material with ≈0.5 µm thick, magnetron-sputtered amorphous film of TiCrFeCoNi high-entropy alloy (HEA) on functional hydrogenation parameters of the hydride electrode is discussed. The multicycle galvanostatic charge/discharge tests carried out in deaerated, 6 M KOH solution allow for determining specific capacity decrease, exchange current density of the H2O/H2 system, and high rate discharge ability (HRD) of the hydride electrodes. Concentrations of individual constituents of the HEA in the particle coating determined by EDS analysis were practically the same (≈20 at.%) as in the applied TiCrFeCoNi target material. The XRD phase analysis pointed out the amorphous structure of the HEA coating. The presence of HEA coating decreases capacity by 10–15 per cent, but increases exchange current density for H2O/H2 system. The effect of HEA on capacity fade is ambiguous: low for 10–25 cycles (most probably due to effective corrosion inhibition) and distinct at long-term cycling (most probably due to galvanic effects resulting from mechanical degradation of particle surface). The presence of HEA coating considerably improves the HRD of the electrode material: for a discharge rate of 5C, the HRD coefficient becomes 4.6 times greater for HEA modified storage material.

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“…In recent years, studies on surface modification through HEAs have gradually emerged because the high entropy alloy coatings can also exhibit excellent comprehensive properties. The methods of surface modification mainly include magnetron sputtering [21], laser cladding [22,23], thermal or cold spraying [24], spark plasma sintering [25], and so on. Among them, laser cladding has been intensively investigated and used owing to its unique features such as high heating speed, low dilution rate, small heat affected zone, fewer coating defects, and good metallurgical bonding between the cladding layer and substrate [26].…”

Section: Introductionmentioning

confidence: 99%

Microstructures and Wear Resistance of CoCrFeNi2V0.5Tix High-Entropy Alloy Coatings Prepared by Laser Cladding

Liang

Nie

et al. 2020

Crystals

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CoCrFeNi2V0.5Tix high entropy alloy coatings were synthesized by laser cladding on Ti-6Al-4V (annotated as TC4) substrate. The microstructures, hardness, and wear properties of the coatings were studied in detail. The results showed that these coatings were all composed of body-centered cubic (BCC) solid solution, (Co,Ni)Ti2 phase, and Ti-rich phase. With the increase of Ti content (x in the range of 0–1.0), the hardness of these coatings (about 960 HV) was basically unchanged and stabilized, whereas, when x was increased to 1.25, the correspondent hardness was decreased significantly to about 830 HV. Compared with original substrate, the wear resistance of high-entropy alloy (HEA) coatings was greatly improved. In particular, CoCrFeNi2V0.5Ti0.75 (donated as Ti0.75) exhibited the lowest wear rate, width, and depth of tracks of wear, indicating the best wear resistance. Moreover, the wear mechanisms of Ti0.75 coating were mainly adhesive wear and oxidative wear.

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High entropy alloy thin films of AlCoCrCu0.5FeNi with controlled microstructure

Cited by 88 publications

References 30 publications

Manufacturing Methods, Microstructural and Mechanical Properties Evolutions of High-Entropy Alloys: A Review

Manufacturing Methods, Microstructural and Mechanical Properties Evolutions of High-Entropy Alloys: A Review

Modification of Hydrogenation and Corrosion Properties of Hydrogen Storage Material by Amorphous TiCrFeCoNi HEA Layer

Microstructures and Wear Resistance of CoCrFeNi2V0.5Tix High-Entropy Alloy Coatings Prepared by Laser Cladding

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