Oxidation behaviour of eutectic refractory high-entropy alloys at 800–1000 °C

Yurchenko, N.; Panina, E.; Zherebtsov, Sergey; Stepanov, Nikita

doi:10.1016/j.corsci.2022.110464

Cited by 30 publications

(5 citation statements)

References 54 publications

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“…In the (HfCo) 90 (NbMo) 10 alloy, the cracks could additionally appear due to the nucleation of the fast-growing and highly volatile MoO 3 [14]. However, although the single-phase B2-ordered HfCo alloy was extremely ductile [36] and capable of preventing the propagation of the cracks and, thus, to avoid the spallation, the less ductile dualphase bcc+B2 (HfCo) 90 (NbMo) 10 alloy remained pristine for a much shorter period of time, accumulating the stresses which were finally relieved by partial spallation [31].…”

Section: Oxidation Behaviourmentioning

confidence: 99%

“…To understand the protection level, which was provided by CoO, we compared the mass gain values obtained after 1 h of oxidation at 1000 • C for the (HfCo) 90 (NbMo) 10 alloy and other RHEAs [9,18,19,21,23,24,31,[56][57][58][59][60] (Figure 6). This period of time was chosen to minimize the evaporation effects that accounted for misleading values of the mass gain and to cover a higher number of the alloys available in the literature.…”

Section: Comparison With Other Rheasmentioning

confidence: 99%

“…Cyclic testing can induce the spallation of oxide scale and even disintegration of the specimen due to the accumulation of thermal stresses [30]. A recent report [31] revealed the trade-off between the oxidation and spallation/disintegration resistances in RHEAs, which was highly dependent on the chemical and phase compositions. Specifically, an increase in Al concentration deteriorated the spallation/disintegration resistance due to a large volume fraction of brittle Laves phase despite lower mass gains at early stages of oxidation compared to alloys with reduced Al content.…”

Section: Introductionmentioning

confidence: 99%

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Oxidation Behaviour of Refractory (HfCo)100−x(NbMo)x High-Entropy Alloys with a bcc+B2 Structure

Yurchenko,

Panina,

Zherebtsov

et al. 2023

Applied Sciences

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Herein, the oxidation behaviour of refractory (HfCo)100−x(NbMo)x (x = 0; 10; 25; 40; 75; 100 (at.%)) high-entropy alloys with a bcc+B2 structure subjected to cyclic oxidation at 1000 °C was studied. The single-phase B2-ordered HfCo alloy demonstrated the best spallation resistance and retained a pristine form after 100 h. The oxidation kinetics of the HfCo alloy was near-parabolic, accompanied by the formation of external HfO2 or CoO layers after 1 or 100 h, respectively. Additions of (NbMo)x deteriorated the spallation resistance (x ≤ 25 at.%) or led to complete disintegration (x > 25 at.%). Among the (NbMo)-containing alloys, the (HfCo)90(NbMo)10 alloy with the dual-phase bcc+B2 structure showed the most promising oxidation resistance. This alloy withstood cyclic oxidation up to 15 h with a mass gain close to the HfCo alloy and survived 100 h without changes in geometry of the specimen. Unlike the HfCo alloy, in the (HfCo)90(NbMo)10 alloy, the external CoO layer was found already after 1 h. The effect of chemical and phase compositions on the formation of certain oxides was discussed. Comparison with the other refractory high-entropy alloys was also presented.

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Section: Oxidation Behaviourmentioning

confidence: 99%

Section: Comparison With Other Rheasmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Oxidation Behaviour of Refractory (HfCo)100−x(NbMo)x High-Entropy Alloys with a bcc+B2 Structure

Yurchenko,

Panina,

Zherebtsov

et al. 2023

Applied Sciences

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“…[ 6 , 7 ]. The range of the potential applications of HEAs is rather wide due to their excellent mechanical properties, as well as resistance to corrosion [ 8 ], heat [ 9 ] and radiation [ 10 ], biocompatibility [ 11 , 12 ], hydrogen storage capacity [ 13 ], etc. These features make HEAs stand out among the conventional alloys and also make them highly in demand in the production of metal–diamond composites for abrasive or thermoconductive needs.…”

Section: Introductionmentioning

confidence: 99%

Manufacturing of Metal–Diamond Composites with High-Strength CoCrCuxFeNi High-Entropy Alloy Used as a Binder

et al. 2023

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This paper focuses on the study of the structure and mechanical properties of CoCrCuxFeNi high-entropy alloys and their adhesion to single diamond crystals. CoCrCuxFeNi alloys were manufactured by the powder metallurgy route, specifically via mechanical alloying of elemental powders, followed by hot pressing. The addition of copper led to the formation of a dual-phase FCC + FCC2 structure. The CoCrCu0.5FeNi alloy exhibited the highest ultimate tensile strength (1080 MPa). Reductions in the ductility of the CoCrCuxFeNi HEAs and the tendency for brittle fracture behavior were observed at high copper concentrations. The equiatomic alloys CoCrFeNi and CoCrCuFeNi demonstrated high adhesion strength to single diamond crystals. The diamond surface at the fracture of the composites having the CoCrFeNi matrix had chromium-rich metal matrix regions, thus indicating that chromium carbide, responsible for adhesion, was formed at the composite–diamond interface. Copper-rich areas were detected on the diamond surface within the composites having the CoCrCuFeNi matrix due to the predominant precipitation of the FCC2 phase at the interfaces or the crack propagation along the FCC/FCC2 interface, resulting in the exposure of the Cu-rich FCC2 phase on the surface.

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“…The relative content of the FCC phase in alloys A–C increases gradually, while the relative content of the Laves phase decreases. According to the mixing rule, the plasticity of alloys A–C increases gradually, while the strength decreases gradually. − Fine grain strengthening primarily depends on the lamellar spacing of the alloy. The lamellar spacing decreases gradually in alloys A–C.…”

mentioning

confidence: 99%

A New Strategy for the Design of Triple-Phase Eutectic High-Entropy Alloys Based on Infinite Solid Solution and Pseudo-Ternary Method

Ye,

Diao,

Kang

et al. 2024

Nano Lett.

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Eutectic high-entropy alloys (EHEAs) have combined both highentropy alloys and eutectic alloy contributions, with excellent castability and hightemperature application potential. Yet, multielement/triple-phase eutectic highentropy alloy (TEHEA) designs remain puzzling. This work proposed a new strategy based on an infinite solid solution and pseudo-ternary model to reveal the puzzle of TEHEAs. The designed triple-phase eutectic high-entropy alloys (TEHEAs) with more than seven elements were identified as face-centered cubic (FCC), ordered body-centered cubic (B2), and Laves phase structures. In this work, the alloy C showcases outstanding comprehensive mechanical properties, offering a novel avenue for the design of high-performance EHEAs.

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Oxidation behaviour of eutectic refractory high-entropy alloys at 800–1000 °C

Cited by 30 publications

References 54 publications

Oxidation Behaviour of Refractory (HfCo)100−x(NbMo)x High-Entropy Alloys with a bcc+B2 Structure

Oxidation Behaviour of Refractory (HfCo)100−x(NbMo)x High-Entropy Alloys with a bcc+B2 Structure

Manufacturing of Metal–Diamond Composites with High-Strength CoCrCuxFeNi High-Entropy Alloy Used as a Binder

A New Strategy for the Design of Triple-Phase Eutectic High-Entropy Alloys Based on Infinite Solid Solution and Pseudo-Ternary Method

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