Mechanical Properties of Nanostructured CoCrFeNiMn High-Entropy Alloy (HEA) Coating

Dang, Chaoqun; Surjadi, James Utama; Gao, Libo; Lü, Yang

doi:10.3389/fmats.2018.00041

Cited by 47 publications

(10 citation statements)

References 28 publications

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“…shows the hardness values as determined using Vickers Microhardness testing. The exceptionally high hardness demonstrated by the as-cast alloy is comparable to many reported HEAs(Dang et al, 2018;Long et al, 2019) [52]…”

supporting

confidence: 78%

Radiation damage tolerance of a novel metastable refractory high entropy alloy V2.5Cr1.2WMoCo0.04

Patel

Richardson

Jim

et al. 2020

Journal of Nuclear Materials

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A novel multicomponent alloy, V2.5Cr1.2WMoCo0.04, produced from elements expected to favour a BCC crystal structure, and to be suitable for high temperature environments, was fabricated by arc melting and found to exhibit a multiphase dendritic microstructure with W-rich dendrites and V-Cr segregated to the inter-dendritic cores. The as-cast alloy displayed an apparent single-phase XRD pattern. Following heat treatment at 1187 °C for 500 hours the alloy transformed into three different distinct phases -BCC, orthorhombic, and tetragonal in crystal structure. This attests to the BCC crystal structure observed in the as-cast state being metastable. The radiation damage response was investigated through room temperature 5 MeV Au + ion irradiation studies. Metastable as-cast V2.5Cr1.2WMoCo0.04 shows good resistance to radiation induced damage up to 40 displacements per atom (dpa). 96 wt% of the as-cast single-phase BCC crystal structure remained intact, as exhibited by grazing incidence Xray diffraction (GI-XRD) patterns, whilst the remainder of the alloy transformed into an additional BCC crystal structure with a similar lattice parameter. The exceptional phase stability seen here is attributed to a combination of self-healing processes and the BCC structure, rather than a high configurational entropy, as has been suggested for some of these multicomponent "High Entropy Alloy" types. The importance of the stability of metastable high entropy alloy phases for behaviour under irradiation is for the first time highlighted and the findings thus challenge the current understanding of phase stability after irradiation of systems like the HEAs.

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supporting

confidence: 78%

Radiation damage tolerance of a novel metastable refractory high entropy alloy V2.5Cr1.2WMoCo0.04

Patel

Richardson

Jim

et al. 2020

Journal of Nuclear Materials

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“…Yu et al [8] prepared CoCrFeCuNi and CoCrFeMnNi high-entropy alloys via mechanical alloying and high-pressure sintering (HPS) and found that the bulk modulus is 117.5 GPa and 136.1 GPa for the HPSed CoCrFeCuNi and CoCrFeMnNi HEAs, respectively. Dang et al [9] adapted high-vacuum radio frequency magnetron sputtering to obtain an equiatomic CoCrFeMnNi high-entropy alloy thin film and investigated its mechanical properties. Their results showed that the deposition of a smooth and homogenous thin film with a grain size of ~10 nm is achieved through this technique.…”

Section: Introductionmentioning

confidence: 99%

Atomic Simulations of Grain Structures and Deformation Behaviors in Nanocrystalline CoCrFeNiMn High-Entropy Alloy

Hou

et al. 2019

Materials

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Using the molecular dynamics method, the melting character, mechanical properties, microstructures, and strain deformation mechanisms of nanocrystalline CoCrFeNiMn high-entropy alloy are systematically investigated in the present work. The simulation results suggest that the melting point in CoCrFeNiMn high-entropy alloy decreases with the grain size, decreasing from 3.6 to 2.0 nm. The grain size has a significant effect on shear and Young’s modulus compared to bulk modulus. The stress-strain simulation demonstrates that the ultimate tensile strength decreases with the decrease of the grain size, while the plastic deformation increases with the decrease in grain size. While the average grain size decreases to 2.0 nm, the amorphization induced by small grain size reduces plastic deformation. The common neighbor analysis shows that the face-centered cubic (FCC) composition of CoCrFeNiMn decreases gradually with decreasing grain size. For the sample with a grain size of 2.0 nm, the FCC composition is about 19% at a strain of 20%, accompanied by severe amorphization. The inverse Hall-Petch effect is observed for nanocrystalline CoCrFeNiMn high-entropy alloy in the present simulations. The atomic snapshot of CoCrFeNiMn with a grain size of 2.0 nm under the uniaxial strain confirms that the grain shape change, stacking fault formation, and amorphization are important mechanisms of plastic deformation in nanocrystalline high-entropy CoCrFeNiMn.

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“…Marshal et al (2019) fabricated HEAs thin films using the same alloy as a target by direct current magnetron sputtering deposition process and the results also showed improvements in the properties of the alloys. Dang et al (2018) used a high-vacuum radio frequency magnetron sputtering process to develop HEA thin films also using the films as the target and they stated that the films had the Nano-grain size of approximately 10 nm which can be applicable for micro-fabrication. On the other hand, Nagy et al (2020) developed a novel multiple-beam sputtering that uses commercial pure metal targets instead of the conventional use of the HEAF targets.…”

Section: Advances In Manufacturing Technologymentioning

confidence: 99%

Recent advances of high entropy alloys for aerospace applications: a review

Dada

Popoola

Mathe

2021

WJE

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Purpose This study aims to review the recent advancements in high entropy alloys (HEAs) called high entropy materials, including high entropy superalloys which are current potential alternatives to nickel superalloys for gas turbine applications. Understandings of the laser surface modification techniques of the HEA are discussed whilst future recommendations and remedies to manufacturing challenges via laser are outlined. Design/methodology/approach Materials used for high-pressure gas turbine engine applications must be able to withstand severe environmentally induced degradation, mechanical, thermal loads and general extreme conditions caused by hot corrosive gases, high-temperature oxidation and stress. Over the years, Nickel-based superalloys with elevated temperature rupture and creep resistance, excellent lifetime expectancy and solution strengthening L12 and γ´ precipitate used for turbine engine applications. However, the superalloy’s density, low creep strength, poor thermal conductivity, difficulty in machining and low fatigue resistance demands the innovation of new advanced materials. Findings HEAs is one of the most frequently investigated advanced materials, attributed to their configurational complexity and properties reported to exceed conventional materials. Thus, owing to their characteristic feature of the high entropy effect, several other materials have emerged to become potential solutions for several functional and structural applications in the aerospace industry. In a previous study, research contributions show that defects are associated with conventional manufacturing processes of HEAs; therefore, this study investigates new advances in the laser-based manufacturing and surface modification techniques of HEA. Research limitations/implications The AlxCoCrCuFeNi HEA system, particularly the Al0.5CoCrCuFeNi HEA has been extensively studied, attributed to its mechanical and physical properties exceeding that of pure metals for aerospace turbine engine applications and the advances in the fabrication and surface modification processes of the alloy was outlined to show the latest developments focusing only on laser-based manufacturing processing due to its many advantages. Originality/value It is evident that high entropy materials are a potential innovative alternative to conventional superalloys for turbine engine applications via laser additive manufacturing.

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Mechanical Properties of Nanostructured CoCrFeNiMn High-Entropy Alloy (HEA) Coating

Cited by 47 publications

References 28 publications

Radiation damage tolerance of a novel metastable refractory high entropy alloy V2.5Cr1.2WMoCo0.04

Radiation damage tolerance of a novel metastable refractory high entropy alloy V2.5Cr1.2WMoCo0.04

Atomic Simulations of Grain Structures and Deformation Behaviors in Nanocrystalline CoCrFeNiMn High-Entropy Alloy

Recent advances of high entropy alloys for aerospace applications: a review

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