Microstructural characteristics and properties of CoCrFeNiNbx high-entropy alloy coatings on pure titanium substrate by pulsed laser cladding

Xiang, Kang; Chen, Liang Yu; Chai, Linjiang; Guo, Ning; Wang, Hao

doi:10.1016/j.apsusc.2020.146214

Cited by 126 publications

(38 citation statements)

References 41 publications

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“…It can be found in Figure 9A that the Nyquist plots of MAO coatings have different radii of capacitive loops which is related to the charge transfer process. Generally, the capacitive loop has a bigger radius, indicating greater charge transfer resistance and better corrosion resistance of the coatings (Dai et al, 2017;Lei et al, 2018;Sang et al, 2019;Xiang et al, 2020). It can also be obviously found that the coatings fabricated under steps current-decreasing mode show greater radii of the capacitive loop compared with that under the constant current mode.…”

Section: Electrochemical Measurementsmentioning

confidence: 88%

Properties of Micro-Arc Oxidation Coating Fabricated on Magnesium Under Two Steps Current-Decreasing Mode

Wang

Zhang

et al. 2020

Front. Mater.

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A concept of two-steps current-decreasing mode derived from constant current mode was developed to fabricate micro-arc oxidation (MAO) coatings on ZK60 magnesium alloy in a dual electrolyte system. The growth characteristics of coatings were analyzed by voltage-time curves, and the coating microstructures were characterized by means of scanning electron microscopy. Meanwhile, the roughness, corrosion behavior, and microhardness of MAO coatings were investigated. The results show that the MAO coatings exhibit a smooth and compact surface, and have improved hardness, higher thickness, smaller roughness, and uneven distribution of holes. Such positive characteristics result in improved corrosion resistance of MAO coatings. The coating produced under the two-steps current mode of "1.2-0.6A" shows a smaller corrosion rate of 0.1559 g/m 2 •h compared with the one produced under the other mode. The results of nanoscratch tests show that the coating fabricated by "1.2-0.6 A" mode has strong bond strength with the substrate. Under this optimized mode, the MAO process also has the lowest energy consumption of 49.8 W/(dm 2 •µm).

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Section: Electrochemical Measurementsmentioning

confidence: 88%

Properties of Micro-Arc Oxidation Coating Fabricated on Magnesium Under Two Steps Current-Decreasing Mode

Wang

Zhang

et al. 2020

Front. Mater.

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“…The result found that the CoCrFeNiNbx HEA coated on titanium sheet produces higher hardness compared to the pure titanium. The Nb coating produces significant improvement in hardness compared to pure titanium due to the consisted phase of BCC solid solution with equiaxed bulk grain morphology and Cr 2 Ti Laves phase [25]. A comparison is performed between the thermal spray coating and laser cladding performance on steel.…”

Section: Laser Cladding (Lc)mentioning

confidence: 99%

Laser Surface Modification of Materials

Jeyaprakash¹,

Yang²,

Kumar³

2021

Practical Applications of Laser Ablation

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The metallic materials such as steel, iron, titanium and nickel alloys etc., are extensively used in the automobile, marine, biomedical, aerospace, chemical industry and power generation sector. However, the poor surface properties restricted their wide usage in many applications. Therefore, the surface properties need to be enhanced through novel treatments without affecting the bulk. In recent years, laser surface modification attracts more due to their inherent properties. The laser based surface altering process is appropriate to modify the metallic surfaces in terms of their flexibility, simple operation and process economy. Laser surface modification includes; surface hardening, melting, alloying, cladding and texturing. Thus, from a process engineering, metallurgical reasons and tribologist view point, the laser surface modification process can be recognized as an important topic.

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“…It is proved that the α phase tends to nucleate at the interface between the ω and β phases. The reason is that this interface is regarded as the minimum misfit low-index habit plane between ω and β phases, resulting in a significant reduction of apparent activation energy for the nucleation and growth of α precipitates (Ohmori et al, 2001;Cremasco et al, 2011;Chen et al, 2019;Dong et al, 2020;Xiang et al, 2020). Hence, α phases with the aid of the isothermal ω phase-assisted nucleation will possess a basically similar BOR with those formed under the OSA condition.…”

Section: Phase Transition In Ti-b12 Alloy After the Two-stage Aging Tmentioning

confidence: 99%

Influence of Isothermal ω Transitional Phase-Assisted Phase Transition From β to α on Room-Temperature Mechanical Performance of a Meta-Stable β Titanium Alloy Ti−10Mo−6Zr−4Sn−3Nb (Ti-B12) for Medical Application

Cheng

et al. 2021

Front. Bioeng. Biotechnol.

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The microstructural evolution and tensile performance of a meta-stable β-type biomedical Ti−10Mo−6Zr−4Sn−3Nb (Ti-B12) alloy subjected to one-stage aging (OSA) and two-stage aging (TSA) are investigated in this work. The OSA treatment is performed at 510°C for 8 h. The TSA treatments are composed of low-temperature aging and high-temperature aging. In the first step, low-temperature aging is conducted at 325°C for 2 h. In the second step, the aging temperature is the same as that in the OSA. The result of the microstructure evolution shows that the precipitated secondary phase after aging is mainly influenced by the process of phase transition. There is a marked difference in the microstructure of the Ti-B12 alloy subjected to the OSA and TSA treatments. The needle-shaped α phases are precipitated in the parent β phase after the OSA treatment. Conversely, the short shuttle-like α phases precipitated after the TSA treatment are formed in the β matrix with the aid of the role of the isothermal ω transitional phase-assisted phase transition. The electron backscattered diffraction results indicate that the crystallographic orientation relationship of the α phases precipitated during the TSA treatment is basically analogous to those in the OSA treatment. The relatively higher tensile strength of 1,275 MPa is achieved by strengthening the effect of the short shuttle-like α precipitation with a size of 0.123 μm in length during the TSA treatment, associating with a suitable elongation of 12% at room temperature simultaneously. The fracture surfaces of the samples after the OSA and TSA treatments indicate that preventing the coarsening of the α layers in the grain boundaries is favorable for the enhancement of strength of Ti-B12 at room temperature. MTT test was carried out to evaluate the acute cytotoxicity and biocompatibility of the implanted material using L929 cells. The relative proliferation rates of cytotoxicity levels 0, 1, 2, 3, and 4 are ≥100, 80–99, 50–79, 30–49, and 0–29%, respectively. The cytotoxicity of the Ti-B12 alloy is slightly better than that of the Ti−6Al−4V alloy, which can meet the requirements of medical materials for biomedical materials.

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Microstructural characteristics and properties of CoCrFeNiNbx high-entropy alloy coatings on pure titanium substrate by pulsed laser cladding

Cited by 126 publications

References 41 publications

Properties of Micro-Arc Oxidation Coating Fabricated on Magnesium Under Two Steps Current-Decreasing Mode

Properties of Micro-Arc Oxidation Coating Fabricated on Magnesium Under Two Steps Current-Decreasing Mode

Laser Surface Modification of Materials

Influence of Isothermal ω Transitional Phase-Assisted Phase Transition From β to α on Room-Temperature Mechanical Performance of a Meta-Stable β Titanium Alloy Ti−10Mo−6Zr−4Sn−3Nb (Ti-B12) for Medical Application

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