Influence of Al content on high temperature oxidation behavior of AlxCoCrFeNiTi0.5 high entropy alloys

Wang, S.; Chen, Z.; Zhang, P.; Zhang, K.; Chen, C.L.; Shen, Baolong

doi:10.1016/j.vacuum.2019.01.053

Cited by 64 publications

(11 citation statements)

References 26 publications

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“…Wang et al revealed the formation of mainly TiO 2 and (Al 0.9 Cr 0.1 ) 2 O 3 at an oxidation temperature of 900 °C. An increase in temperature to 1100 °C caused the formation of spinel, TiO 2 , Cr 2 O 3 and (Al 0.9 Cr 0.1 ) 2 O 3 [ 23 ]. The significantly longer duration time of 100 h at higher temperatures increases the oxide-layer thickness and enhances the traceability.…”

Section: Resultsmentioning

confidence: 99%

High-Temperature Wear Behaviour of Spark Plasma Sintered AlCoCrFeNiTi0.5 High-Entropy Alloy

Löbel

Lindner

Pippig

et al. 2019

Entropy

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In this study, the wear behaviour of a powder metallurgically produced AlCoCrFeNiTi0.5 high-entropy alloy (HEAs) is investigated at elevated temperatures. Spark plasma sintering (SPS) of inert gas atomised feedstock enables the production of dense bulk material. The microstructure evolution and phase formation are analysed. The high cooling rate in the atomisation process results in spherical powder with a microstructure comprising two finely distributed body-centred cubic phases. An additional phase with a complex crystal structure precipitates during SPS processing, while no coarsening of microstructural features occurs. The wear resistance under reciprocating wear conditions increases at elevated temperatures due to the formation of a protective oxide layer under atmospherical conditions. Additionally, the coefficient of friction (COF) slightly decreases with increasing temperature. SPS processing is suitable for the production of HEA bulk material. An increase in the wear resistance at elevated temperature enables high temperature applications of the HEA system AlCoCrFeNiTi0.5.

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Section: Resultsmentioning

confidence: 99%

High-Temperature Wear Behaviour of Spark Plasma Sintered AlCoCrFeNiTi0.5 High-Entropy Alloy

Löbel

Lindner

Pippig

et al. 2019

Entropy

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“…To further investigate the phases of the CoCrFeNiAl HEC, Figure a shows GIXRD patterns at points P1 to P6 that were measured at various lateral regions on a CoCrFeNiAl thin film. From these results, all patterns P1 to P6 can be indexed as an ITO substrate, an fcc structure AO, and an A 3 O 4 spinel structure (A = Co, Cr, Fe, Ni, or Al) . The lattice parameter of A 3 O 4 was calculated to be 8.164 Å, and that of the AO phase was 4.18 Å.…”

Section: Results and Discussionmentioning

confidence: 98%

“…From these results, all patterns P1 to P6 can be indexed as an ITO substrate, an fcc structure AO, and an A 3 O 4 spinel structure (A = Co, Cr, Fe, Ni, or Al). 38 The lattice parameter of A 3 O 4 was calculated to be 8.164 Å, and that of the AO phase was 4.18 Å. The grain sizes of AO and A 3 O 4 were estimated to In addition, a comparison of the XRD spectra of the CoCrFeNiAl HECs before and after the reaction is shown in the Supporting Information in Figure S2.…”

Section: Resultsmentioning

confidence: 99%

Rapid Fabrication of High-Entropy Ceramic Nanomaterials for Catalytic Reactions

et al. 2021

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Although high-entropy alloys have been intensively studied in the past decade, there are still many requirements for manufacturing processes and application directions to be proposed and developed, but most techniques are focused on high-entropy bulk materials and surface coatings. We fabricated high-entropy ceramic (HEC) nanomaterials using simple pulsed laser irradiation scanning on mixed salt solutions (PLMS method) under low-vacuum conditions. This method, allowing simple operation, rapid manufacturing, and low cost, is capable of using various metal salts as precursors and is also suitable for both flat and complicated 3D substrates. In this work, we engineered this PLMS method to fabricate high-entropy ceramic oxides containing four to seven elements. To address the catalytic performance of these HEC nanomaterials, we focused on CoCrFeNiAl high-entropy oxides applied to the oxygen-evolution reaction (OER), which is considered a sluggish process in water. We performed systematic material characterization to solve the complicated structure of the CoCrFeNiAl HEC as a spinel structure, AB2O4 (A, B = Co, Cr, Fe, Ni, or Al). Atoms in A and B sites in the spinel structure can be replaced with other elements; either divalent or trivalent metals can occupy the spinel lattice using this PLMS process. We applied this PLMS method to manufacture electrocatalytic CoCrFeNiAl HEC electrodes for the OER reaction, which displayed state-of-the-art activity and stability.

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“…14–17 Subsequent studies have shown that adding or replacing low-density elements with higher oxidation resistance with some refractory elements can greatly reduce these disadvantages. 18–24 Accordingly, Gorr et al 14 designed and prepared the equiatomic WMoCrTiAl RHEA via vacuum arc melting (VAM) method to improve the oxidation resistance and reduce the density.…”

Section: Introductionmentioning

confidence: 99%

Non-equiatomic W₁₀Mo₂₇Cr₂₁Ti₂₂Al₂₀ high-entropy alloy produced by mechanical alloying and spark plasma sintering: Phase evolution and mechanical properties

Naser-Zoshki¹,

Rashid²,

Vahdati-Khaki³

2022

Proceedings of the Institution of Mechanical Engineers, Part L:

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In this work, non-equiatomic W10Mo27Cr21Ti22Al20 refractory high-entropy alloy (RHEA) was produced using mechanical alloying followed by spark plasma sintering. The phase formation, microstructure, and compressive mechanical properties of the alloy were studied. During mechanical alloying, a Body-centered cubic (BCC) solid solution phase with a particle size of less than 1 µm was obtained after 18 h ball milling. The microstructure of the sintered sample exhibits three distinct phases consisting of two solid solution phases BCC1 and BCC2 as well as fine TiCxOy precipitates distributed in them. The volume fractions of each phase were about 79%, 8%, and 13%, respectively. The sintered W10Mo27Cr21Ti22Al20 showed yield strengths of 2465, 1506, 405, and 290 MPa at room temperature 600, 1000, and 1200°C, respectively, which are about twice that of the same refractory high-entropy alloy produced by vacuum arc melting. At 1000 and 1200°C, the strength after yielding gradually increased to 970 and 718 MPa at a compressive strain of 60%. The studied refractory high-entropy alloy can have good potential in high-temperature applications due to its high specific strength at elevated temperatures compared to conventional Ni-based superalloys and most as-reported refractory high-entropy alloys.

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Influence of Al content on high temperature oxidation behavior of AlxCoCrFeNiTi0.5 high entropy alloys

Cited by 64 publications

References 26 publications

High-Temperature Wear Behaviour of Spark Plasma Sintered AlCoCrFeNiTi0.5 High-Entropy Alloy

High-Temperature Wear Behaviour of Spark Plasma Sintered AlCoCrFeNiTi0.5 High-Entropy Alloy

Rapid Fabrication of High-Entropy Ceramic Nanomaterials for Catalytic Reactions

Non-equiatomic W₁₀Mo₂₇Cr₂₁Ti₂₂Al₂₀ high-entropy alloy produced by mechanical alloying and spark plasma sintering: Phase evolution and mechanical properties

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Influence of Al content on high temperature oxidation behavior of AlxCoCrFeNiTi0.5 high entropy alloys

Cited by 64 publications

References 26 publications

High-Temperature Wear Behaviour of Spark Plasma Sintered AlCoCrFeNiTi0.5 High-Entropy Alloy

High-Temperature Wear Behaviour of Spark Plasma Sintered AlCoCrFeNiTi0.5 High-Entropy Alloy

Rapid Fabrication of High-Entropy Ceramic Nanomaterials for Catalytic Reactions

Non-equiatomic W10Mo27Cr21Ti22Al20 high-entropy alloy produced by mechanical alloying and spark plasma sintering: Phase evolution and mechanical properties

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Non-equiatomic W₁₀Mo₂₇Cr₂₁Ti₂₂Al₂₀ high-entropy alloy produced by mechanical alloying and spark plasma sintering: Phase evolution and mechanical properties