Surface modification of plasma nitriding on Al CoCrFeNi high-entropy alloys

Hou, Jinxiong; Song, Weijie; Lan, Lihua; Qiao, J.W.

doi:10.1016/j.jmst.2020.01.057

Cited by 39 publications

(8 citation statements)

References 17 publications

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“…For example, Kong et al [ 8 ] found that the AlCoCrFeNiTi 0.5 HEA annealed at 800 °C for 5 h had a lower friction coefficient and better wear resistance than the as-cast state. Hou et al [ 9 ] applied the plasma nitriding process to modify the surface of Al x CoCrFeNi HEAs, resulting in a 4- to 18-fold increase in wear resistance. Chen et al [ 10 ] have employed the powder-packed boronizing method for surface strengthening of CoCrNi-based HEA.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Surface Properties of the Al0.65CoCrFeNi High-Entropy Alloy via Laser Remelting

Miao

et al. 2023

Materials

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The laser remelting technique was applied to the surface modification of the Al0.65CoCrFeNi high-entropy alloy (HEA) to further advance its mechanical potential. The microstructure of the remelted layer was refined from coarse dendritic to submicron-scale basket weave compared with the as-cast substrate, resulting in a 1.8-time increase in Vickers microhardness. The nanoindentation tests indicated that the nanohardness of the remelted layer was higher than that of each phase in the substrate. Meanwhile, the remelted layer retained considerable plasticity, as evidenced by its high Wp/Wt ratio (0.763) and strain hardening exponent (0.302). Additionally, adhesive wear prevailed on the substrate, while only abrasive wear features were observed on the remelted layer. Accordingly, the average friction coefficient and the wear rate of the remelted layer were minimized by 23% and 80%, respectively, compared with the substrate. Our findings explored an industrialized method to enhance the surface properties of the Al0.65CoCrFeNi HEA and also provided some helpful references for its laser additive manufacturing.

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Section: Introductionmentioning

confidence: 99%

Enhanced Surface Properties of the Al0.65CoCrFeNi High-Entropy Alloy via Laser Remelting

Miao

et al. 2023

Materials

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“…HENs have gained considerable interest in the scientific community, demonstrating a mixture of properties, often highly enhanced in comparison to the conventional TMN counterparts [5]. Extensive studies have been performed focusing mostly on the investigation of the dependence of the structural and mechanical properties of HENs on varying the deposition parameters of PVD processes such as reactive gas flow, substrate bias potential, and substrate temperature [7,8]. However, a vast compositional space and lack of the systematic studies of their functional properties, limits their introduction to applications.…”

Section: Introductionmentioning

confidence: 99%

High-Entropy Transition Metal Nitride Thin Films Alloyed with Al: Microstructure, Phase Composition and Mechanical Properties

et al. 2022

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“…The methods of surface modification also play an important role in the design of HEAs since they allow eliminating some defects as pores or microcracks and increasing durability. For example, the HEA surface can be modified by plasma nitriding [7], laser remelting [8], boronizing [9], gaseous carburization [10], ultrasonic nanocrystal surface modification [11] and high current pulsed electron beam treatment (HCPEB) [12,13]. The latter method introduces high energies into the surface layers and forms a cellular microstructure with a grain size of 100 -500 nm, leading to better mechanical and tribological characteristics.…”

Section: Introductionmentioning

confidence: 99%

“…In our previous article, we made an approach to the model of this mechanism considering the contribution of thermocapillary and thermoelectric instability arising on the molten surface [14]. We assumed that the reason for the formation of a cellular structure is a combination of thermal, evaporationcapillary, and thermoelectric instabilities, since they become important at temperature gradients of 10 6 K / m and molten layer thicknesses of ~1-100 μm [6,7]. According to the results of [12,13], with an increase in the number of pulses or the energy density of the electron beam (E s ), the size of the crystallization cells increases.…”

Section: Introductionmentioning

confidence: 99%

Modeling the mechanism of micro / nanostructured surface formation in Al-Co-Cr-Fe-Ni and Co-Cr-Fe-Mn-Ni high-entropy alloys treated with a high current pulsed electron beam

et al. 2022

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In this work, we investigated, using transmission and scanning electron microscopy, the microstructure of Al-Co-Cr-Fe-Ni and Co-Cr-Fe-Mn-Ni non-equimolar high-entropy alloys treated by high current pulsed electron beams with an energy density of 30 J / cm 2 . Both alloys revealed a cellular crystallization structure with an average cell size of 192 ± 5 nm, and 453 ± 6 nm, correspondingly. The study aims to improve the model of the mechanism of formation of micro-and nanostructured surface layers taking into account combined thermocapillary, concentration-capillary, evaporative-capillary and thermoelectric instabilities at the melt-plasma interface. The results of the linear stability analysis showed that the absorbed power density is lost by evaporation that leads to a decrease in the values of the gradient of the undisturbed temperature and, an increase in the wavelength at which the maximum rate of growth of disturbances is observed. An analysis of the dispersion equation showed that the values of the wavelengths of disturbances on the surface of alloys in the liquid phase are 454 nm for Co-Cr-Fe-Mn-Ni and 189 nm for Al-Co-Cr-Fe-Ni, which deviate from the experimental data by no more than 2 %.

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Surface modification of plasma nitriding on Al CoCrFeNi high-entropy alloys

Cited by 39 publications

References 17 publications

Enhanced Surface Properties of the Al0.65CoCrFeNi High-Entropy Alloy via Laser Remelting

Enhanced Surface Properties of the Al0.65CoCrFeNi High-Entropy Alloy via Laser Remelting

High-Entropy Transition Metal Nitride Thin Films Alloyed with Al: Microstructure, Phase Composition and Mechanical Properties

Modeling the mechanism of micro / nanostructured surface formation in Al-Co-Cr-Fe-Ni and Co-Cr-Fe-Mn-Ni high-entropy alloys treated with a high current pulsed electron beam

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