Synthesis and characterization of FeCoNiCrCu high-entropy alloy coating by laser cladding

Zhang, Hui; Pan, Ye; He, Yizhu

doi:10.1016/j.matdes.2010.12.001

Cited by 263 publications

(115 citation statements)

References 22 publications

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“…The content of Cu and Si was determined to be 70% and 10%, respectively. This is consistent with previous data showing that Cu is easily segregated during solidification and a small additional Si content benefits the cladding quality of the coating [14,15].…”

Section: Introductionsupporting

confidence: 93%

“…Moreover, it was found that the hardness in the matrix of the Al 0.3 B 0.6 coating greatly increases and reaches approximately 502 HV 0.5 . This is significantly higher than the hardness reported by a number of previous studies [8,14]. These papers have reported that the HEAs with a FCC matrix generally have good plasticity and low hardness (mostly between 200 to 400 HV).…”

Section: Discussionmentioning

confidence: 63%

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Effects of Different Levels of Boron on Microstructure and Hardness of CoCrFeNiAlxCu0.7Si0.1By High-Entropy Alloy Coatings by Laser Cladding

Zhang

et al. 2017

Coatings

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High-entropy alloys (HEAs) are novel solid solution strengthening metallic materials, some of which show attractive mechanical properties. This paper aims to reveal the effect of adding small atomic boron on the interstitial solid solution strengthening ability in the laser cladded CoCrFeNiAl x Cu 0.7 Si 0.1 B y (x = 0.3, x = 2.3, and 0.3 ≤ y ≤ 0.6) HEA coatings. The results show that laser rapid solidification effectively prevents brittle boride precipitation in the designed coatings. The main phase is a simple face-centered cubic (FCC) matrix when the Al content is equal to 0.3. On the other hand, the matrix transforms to single bcc solid solution when x increases to 2.3. Increasing boron content improves the microhardness of the coatings, but leads to a high degree of segregation of Cr and Fe in the interdendritic microstructure. Furthermore, it is worth noting that CoCrFeNiAl 0.3 Cu 0.7 Si 0.1 B 0.6 coatings with an FCC matrix and a modulated structure on the nanometer scale exhibit an ultrahigh hardness of 502 HV 0.5 .

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Section: Introductionsupporting

confidence: 93%

Section: Discussionmentioning

confidence: 63%

Effects of Different Levels of Boron on Microstructure and Hardness of CoCrFeNiAlxCu0.7Si0.1By High-Entropy Alloy Coatings by Laser Cladding

Zhang

et al. 2017

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“…In the present study, two HEA films with components of CoCrFeNiCu and CoCrFeNiCuAl 2.5 were prepared using magnetron sputtering. The atomic arrangements of these two compositions are typical fcc and bcc structures [1,19,24,25], respectively. The roomtemperature creep behaviors were carefully investigated in nanoindentation with a Berkovich indenter.…”

Section: Introductionmentioning

confidence: 99%

Nanoindentation study on the creep characteristics of high-entropy alloy films: fcc versus bcc structures

Feng

Debela

et al. 2016

International Journal of Refractory Metals and Hard Materials

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Using the magnetron sputtering technique, two typical high-entropy alloy (HEA) films namely CoCrFeNiCu (Al-0) with a face-centered cubic (fcc) structure and CoCrFeNiCuAl 2.5 (Al-2.5) with a body-centered cubic (bcc) structure were prepared by alloy targets. The as-deposited HEA films have a columnar-growth mode and nanocrystalline grains. The creep behaviors of both HEA films were systematically investigated by nanoindentation with a Berkovich indenter. The bcc Al-2.5 exhibited a stronger creep resistance than the fcc Al-0. In addition, with the increase of holding load and/or loading rate, the creep deformation was significantly enhanced in the fcc Al-0. Interestingly, it was almost history-independent in the bcc Al-2.5. The creep characteristics of HEA films could be related to the distinct lattice structures, which apparently affect the kinetics of plastic deformation. The strain rate sensitivity (SRS) and activation volume of the dislocation nucleation were carefully estimated for both HEA films. In view of the large differences of activation volumes between Al-0 and Al-2.5, we present discussions to explain the observed creep characteristics in HEA films.

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“…Мікротвердість високоентропійних покрит-тів AlSiNiCoFeCr і AlSiNiCoFeCrТі, отриманих електронно-променевим наплавленням, значно вища, ніж у більшості покриттів із ВЕСів, отрима-них методами лазерної наплавки, мікротвердість яких становить 3-7,8 ГПа [15,16], та в 4-5 разів вища твердості сталевої підкладки (HV  2,2 ГПа). Висока мікротвердість покриттів AlSiNiCoFeCr та AlSiNiCoFeCrТі зумовлена композиційним фак-тором зміцнення на рівні кристалічної решітки, тобто формуванням ОЦК твердих розчинів замі-щення із сильним спотворенням кристалічної ре-шітки завдяки різниці атомних радіусів компо-нентів.…”

Section: 1 к 1unclassified

Multicomponent AlSiNiCoFeCr and AlSiNiCoFeCrTi High-Entropy Coatings on Steel

Yurkova

Cherniavskyi

Matveev

et al. 2017

Research Bulletin of the National Technical University of Ukraine "Kyiv Politechnic Institute"

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Background. In many situations, only the contact surface properties are important in determining performance of the component in practical applications. Therefore, the use of a coating from materials with high physical and mechanical characteristics, such as high-entropy alloys (HEA), has several attractive advantages. HEAs have been found to have novel microstructures and unique properties. Considering HEA's tendency to form simple structures, fabricating HEA coating by electron beam welding process is of great significance and potential for extensive use. Until now this novel method for preparing HEA coatings has just been reported by any organizations. Objective. The purpose of this work is to study the features of microstructure, phase and chemical composition, and microhardness of HEA coatings, produced by electron-beam welding on steel substrate of 6 and 7-component powder equiatomic mixtures of the system Al -Si -Ni -Со -Fe -Cr -Ti. Methods. The coatings were obtained by electron-beam welding. The microstructure, chemical composition, and constituent phases of the synthesized coatings were characterized by SEM, EDX, and XRD analysis, respectively. Microhardness was also evaluated.Results. Experimental results demonstrate that the AlSiNiСоFeCr and AlSiNiСоFeCrTi HEA coatings are composed of only three substitutional solid solutions with body-centered cubic (BCC) structure and different lattice parameter due to different component concentration. The coatings exhibit dendritic microstructure with different size and morphology. The Vickers's hardness of AlSiNiСоFeCr and AlSiNiСоFeCrTi HEA coatings has been found to be HV  9.2  0.2 and HV  11.25  0.3 GPa, respectively, and is much higher than that of the similar alloys prepared by laser cladding technique. Conclusions. Evidence from multicomponent powder mixtures of the Al -Si -Ni -Со -Fe -Cr -Ti system, it is possible to form HEA coatings consisting of solid substitution solutions with a BCC structure and all initial components by electron-beam welding method. Through the strong crystal lattice distortion of solid solutions at the mutual dissolving of dissimilar atoms of AlSiNiCoFeCr and AlSiNiCoFeCrTi, HEA coatings have a high microhardness that is much higher than the hardness of the initial components.

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Synthesis and characterization of FeCoNiCrCu high-entropy alloy coating by laser cladding

Cited by 263 publications

References 22 publications

Effects of Different Levels of Boron on Microstructure and Hardness of CoCrFeNiAlxCu0.7Si0.1By High-Entropy Alloy Coatings by Laser Cladding

Effects of Different Levels of Boron on Microstructure and Hardness of CoCrFeNiAlxCu0.7Si0.1By High-Entropy Alloy Coatings by Laser Cladding

Nanoindentation study on the creep characteristics of high-entropy alloy films: fcc versus bcc structures

Multicomponent AlSiNiCoFeCr and AlSiNiCoFeCrTi High-Entropy Coatings on Steel

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