Study on self-lubricating properties of AlCoCrFeNi2.1 eutectic high entropy alloy with electrochemical boronizing

Dong, Jianxin; Wu, Hongxing; Chen, Ying; Zhang, Yongliang; Wu, Yan; Yin, Shaochong; Du, Yin; Hua, Ke; Wang, Haifeng

doi:10.1016/j.surfcoat.2022.128082

Cited by 24 publications

(10 citation statements)

References 46 publications

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“…It can be seen that the boronized CoCrNi MEA has the lowest wear rate about 0.16 × 10 −5 mm 3 Nm −1 under the deionized water condition, which is an order of magnitude lower than that of HEAs. [ 30,32,33 ]…”

Section: Resultsmentioning

confidence: 99%

“…Furthermore, a significant reduction in friction and wear has been reported when boronized surface is exposed to deionized water. [ 30,31 ] Dong et al [ 32 ] found that the friction coefficient of boronized HEA was reduced to 0.23 under deionized water condition, which was about 35.1% lower than that of the original alloy. The wear rate was also reduced by 80%.…”

Section: Introductionmentioning

confidence: 99%

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Microstructure Characterization and Robust Lubrication Performance of CoCrNi Medium Entropy Alloy with Advanced Electrochemical Boronizing Treatment

Feng,

Wu,

et al. 2023

Adv Eng Mater

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CoCrNi medium entropy alloy (MEA) is a promising material for aviation and aerospace applications due to its excellent strength and ductility. However, its low surface hardness and poor wear resistance pose challenges for its tribological performance. To address this issue, electrochemical boronizing was explored as a potential solution, offering advantages such as a fast boronizing rate and low cost. This study demonstrated that electrochemical boronizing can significantly enhance the surface hardness and self‐lubrication performance of CoCrNi MEA, as well as retaining the impressive mechanical performance. Results show that a boronized layer with thickness of about 50 μm is formed on the surface in 45 minutes. The boronized layer is mainly composed of Co2B, Ni2B, CrB, CoB and Ni3B. After boronizing, the surface hardness of the sample increases by about 9 times, the ultimate tensile strength and uniform elongation could reach 97% and 73% to these of the original sample, respectively. Compared with the original alloy, the friction coefficient and wear rate of boronized MEA are reduced by 38% and 85% under deionized water condition, respectively. X‐ray Photoelectron Spectroscopy (XPS) analysis reveals the generation of boron‐containing tribofilm on the wear scars, which significantly reduces friction and wear during the friction process.This article is protected by copyright. All rights reserved.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Microstructure Characterization and Robust Lubrication Performance of CoCrNi Medium Entropy Alloy with Advanced Electrochemical Boronizing Treatment

Feng,

Wu,

et al. 2023

Adv Eng Mater

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“…The formation of the diffusion layer was the result of the insoluble carbon of borides in the boronizing layer. The carbon was discharged into the substrate, thereby increasing the carbon content of the matrix in the process of boronizing [5][6][7], and the matrix with higher carbon content formed the equilibrium tissue with more pearlite, which became the transition region with darker color in the air cooling stage after boronizing treatment. Fig.…”

Section: Microstructure Analysis Of Boronizing Layermentioning

confidence: 99%

An Evaluation of crushing performance of a Boride layer formed on high strength wear resistant steel

Tong

2023

J. Phys.: Conf. Ser.

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Boronizing treatment on the surface of wear-resistant steel can both improve the hardness and abrasion resistance of the surface layer and reduce the difference between the hardness of the boride layer and substrate, which can also greatly improve the crush performance and effeciently prevent the occurrence of brittle and fragile boronizing layer in the service process. In this paper, a boride layer without impurities was fabricated on the surface of high strength wear resistant steel (HSWRS) by solid powder boronizing treatment. The boriding behaviors of the HSWRS sample, including phase composition, microstructure, micro-hardness, wear resistance and crushing performance were investigated in comparison with those of 45 carbon steel borided at 1050 °C for 5 h. The results showed that the treated HSWRS was covered by a homogeneous boride layer. The boride layer was mainly composeded of Fe2B, V2B3, CrB2, MC, M2C. The highest micro-hardness value of the boride layer was about 1525 HV and the hardness took on gradient distribution from the surface to the center, and finally reduced to the hardness of the substrate. Compared to the borided 45 carbon steel, the boriding samples exhibit a similar surface toughness, but improved crushing performance.

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“…While the solid powder boronizing serves as a promising means of surface strengthening, the boride layer is on the surface, which has very high hardness (Fe 2 B phase: 1290-1680 HV, FeB phase: 1890-2340 HV), and good wear resistance. The anti-wear grain abrasion performance is better than that of carburizing and nitriding especially, high red hardness, high-temperature oxidation resistance and high corrosion resistance [1][2][3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Boronizing Process of High-vanadium Alloy Steel

Fu,

Tong

2023

J. Phys.: Conf. Ser.

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The high-vanadium alloy steel substrate surface was carried out by solid powder boronizing. The results showed that a certain thickness and compact structure of the boronizing layers could be obtained after boronizing. The thickness of the boronizing layer was about –53 μm; the thickness of the transition zone was about –36 μm, and the boronizing layer was combined with the substrate firmly. The boronizing layers consist of FeB and embed into the substrate like a spider. The alloying elements have little effect on the formation of sawtooth morphology in the boride layers. The thickness of the boronizing layers increased with the boronizing time and temperature increase, and the thickness of the boronizing layer has a parabola relationship with the processing time.

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Study on self-lubricating properties of AlCoCrFeNi2.1 eutectic high entropy alloy with electrochemical boronizing

Cited by 24 publications

References 46 publications

Microstructure Characterization and Robust Lubrication Performance of CoCrNi Medium Entropy Alloy with Advanced Electrochemical Boronizing Treatment

Microstructure Characterization and Robust Lubrication Performance of CoCrNi Medium Entropy Alloy with Advanced Electrochemical Boronizing Treatment

An Evaluation of crushing performance of a Boride layer formed on high strength wear resistant steel

Analysis of the Boronizing Process of High-vanadium Alloy Steel

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