Microstructure and hardness of NbTiZr and NbTaTiZr refractory medium-entropy alloy coatings on Zr alloy by laser cladding

Guan, Hao; Chai, Linjiang; Wang, Yueyuan; Xiang, Kang; Wu, Lu; Pan, Hucheng; Yang, Ming‐Bo; Teng, Changqing; Zhang, Wei

doi:10.1016/j.apsusc.2021.149338

Cited by 58 publications

(8 citation statements)

References 50 publications

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“…However, their application as coatings have received considerable research interest because of the wide field of application and relatively cheaper cost of thin films (Li et al, 2018c). However, the hardness of HEAs coatings is usually relatively low, hence, their application as coatings requires enhanced hardness and wear resistance, which could be achieved by the addition of hard phases (Wang et al, 2021b;Guan et al, 2021). Wang et al (2021b) prepared a HEA composite coating from titanium powder, C 3 N 4 powder and Cr 20 Cu 20 Fe 20 Ni 20 Al 20 by plasma transfer arc cladding technique and studied the hardness, wear properties and microstructural features of the HEA composite coating using microhardness tester, dry wear test multifunctional tribometer, SEM, TEM and EDS.…”

Section: High-entropy Alloy-based Compositesmentioning

confidence: 99%

Materials for electrocatalysts in proton exchange membrane fuel cell: A brief review

Alabi

Popoola

et al. 2023

Front. Energy Res.

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Energy is a requisite factor for technological advancement and the economic development of any society. Currently, global energy demand and supply largely rely on fossil fuels. The use of fossil fuels as a source of energy has caused severe environmental pollution and global warming. To salvage the dire situation, research effort is geared toward the utilization of clean, renewable and sustainable energy sources and the hydrogen energy economy is among the most preferred choices. Hydrogen energy economy, which includes hydrogen production, storage and conversion has gained wide consideration as an ecofriendly future energy solution with a fuel cell as its conversion device. Fuel cells, especially, the proton exchange membrane category, present a promising technology that converts hydrogen directly into electricity with great efficiency and no hazardous emissions. Unfortunately, the current generation of proton exchange membrane fuel cells faces some drawbacks that prevent them from large-scale market adoption. These challenges include the high costs and durability concerns of catalyst materials. The main source of high cost in fuel cells is the platinum catalyst used in the electrodes, particularly at the cathode where the sluggish oxygen reduction reaction kinetics require high loading of precious metals. Many research efforts on proton exchange membrane fuel cells are directed to reduce the device cost by reducing or completely replacing the platinum metal loading using alternative low-cost materials with “platinum-like” catalytic behaviour while maintaining high power performance and durability. Consequently, this review attempts to highlight recent research efforts to replace platinum and carbon support with other cost-effective and durable materials in proton exchange membrane fuel cell electrocatalysts. Overview of promising materials such as alloy-based (binary, ternary, quaternary and high-entropy alloys), single atom and metal-free electrocatalysts were discussed, as the research areas are still in their infancy and have many open questions that need to be answered to gain insight into their intrinsic requirements that will inform the recommendation for outlook in selecting them as electrocatalysts for oxygen reduction reaction in proton exchange membrane fuel cell.

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Section: High-entropy Alloy-based Compositesmentioning

confidence: 99%

Materials for electrocatalysts in proton exchange membrane fuel cell: A brief review

Alabi

Popoola

et al. 2023

Front. Energy Res.

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“…Final important examples are the NbTaTiZr refractory medium-entropy alloy coatings [88] as well as carbide-containing Fe50Mn30Co10Cr10-xNbC composite coatings [89].…”

Section: Influence Of Distance From the Surface On Gb Wetting In Hea ...mentioning

confidence: 99%

“…Another group of coatings builds the FeCoNi-based HEAs such as FeCoNiCrMo alloy containing the CeO 2 particles [85], the ceramic p6rticle reinforced FeCoNiCrMnTi HEAs [68], single-phase fcc CoCrFeNiSi coatings [86], the Al 2 CrFeCo x CuNiTi coatings with x = 0.0, 0.5, 1.0, 1.5, 2.0 [16], AlFeCuCrCoNi-WC x HEA coatings with carbon content of 5, 10 and 15 at.% [87] and Ni 1.5 CrCoFe 0.5 Mo 0.1 Nb x eutectic HEA coatings with x = 0.55 (hypoeutectic), 0.68 (eutectic), 0.8 (hypereutectic alloys) [15]. Final important examples are the NbTaTiZr refractory medium-entropy alloy coatings [88] as well as carbide-containing Fe 50 Mn 30 Co 10 Cr 10-x NbC composite coatings [89].…”

Section: Gb Wetting In Multitrack and Multilayer Hea Coatingsmentioning

confidence: 99%

High Entropy Alloys Coatings Deposited by Laser Cladding: A Review of Grain Boundary Wetting Phenomena

et al. 2022

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High-entropy alloys (HEAs) are called also alloys without a main component or multiprincipal alloys. They consist of five, six or more components in more or less equal proportions and possess unique properties. Several dozens of thousands of publications have already been devoted to bulk HEAs, while HEA coatings are just beginning to develop. More than half of the works on the deposition of HEA coatings are devoted to laser cladding. In the laser cladding process, a mixture of powders on a substrate is melted in a focused laser beam, which sequentially scans the substrate. In the heated zone, the powder mixture melts. At the end of the crystallization process, a solidified polycrystal and a small amount of residual melt are found in the heated zone. It is possible that the grain boundaries (GBs) in the solidified polycrystal are incompletely or fully wetted by this liquid phase. In this way, the GB wetting with a melt determines the morphology and microstructure of HEAs coatings. This review analyzes GB wetting in single-phase HEAs, as well as in HEAs containing two or more phases. We analyze how the HEAs’ composition, laser scanning speed, laser beam power, external magnetic field or ultrasonic impact affect the microstructure and GB wetting. It is also shown how the microstructure and GB wetting change over the thickness of the rather thick as well as multilayer coatings deposited using a laser cladding.

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“…Until now, many studies have been focused on the preparation and properties of HEA/MEA coating. The preparation methods of HEA/MEA coating include the resistance welding method [8], utilizing laser cladding [9][10][11], DC magnetron sputtering [12,13], and plasma spray [14], etc. Among them, laser cladding is widely used to fabricate HEA/MEA coatings [15,16].…”

Section: Introductionmentioning

confidence: 99%

Friction and Wear Performance of CoCrFeMnNiW Medium-Entropy Alloy Coatings by Plasma-Arc Surfacing Welding on Q235 Steel

Wang

Miao

et al. 2021

Coatings

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In this study, CoCrFeMnNiW medium-entropy alloy coating on Q235 was fabricated by plasma surfacing technology. The wear performance of the prepared one-layer coating and the two-layer coating was studied by a friction and abrasion tester. The microstructure and performance of the CoCrFeMnNiW coating were researched by optical microscope, a nano-indentation test, SEM, and hardness tester. The results show that the microstructure of the coating is made up of a fusion zone, equiaxed dendrites near the fusion zone, coarse columnar crystals, and near-surface with a certain direction between the near-fusion zone and near-surface fine equiaxed grains. The wear mechanism of one layer coating was abrasive with wear and fatigue wear. The wear mechanism of the two-layer coating was adhesive with wear and fatigue wear. For CoCrFeMnNiW MEA coating, the main factors determining their wear resistance were the value of its depth recovery ratio (ηh) and EIT.

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Microstructure and hardness of NbTiZr and NbTaTiZr refractory medium-entropy alloy coatings on Zr alloy by laser cladding

Cited by 58 publications

References 50 publications

Materials for electrocatalysts in proton exchange membrane fuel cell: A brief review

Materials for electrocatalysts in proton exchange membrane fuel cell: A brief review

High Entropy Alloys Coatings Deposited by Laser Cladding: A Review of Grain Boundary Wetting Phenomena

Friction and Wear Performance of CoCrFeMnNiW Medium-Entropy Alloy Coatings by Plasma-Arc Surfacing Welding on Q235 Steel

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