On the yield stress anomaly in a B2-ordered refractory AlNbTiVZr0.25 high-entropy alloy

Yurchenko, N.; Panina, E.; Belyakov, Andrey; Салищев, Г. А.; Zherebtsov, Sergey; Stepanov, Nikita

doi:10.1016/j.matlet.2021.131584

Cited by 11 publications

(3 citation statements)

References 25 publications

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“…For the purposes of this work, due to the limited amount of data related to tensile properties, we focused the analysis on annealed RHEAs tested in compression at room temperature (in total, 96 alloys). [ 9,11,13,14,31–62 ]…”

Section: Databasementioning

confidence: 99%

High‐Throughput Design of Refractory High‐Entropy Alloys: Critical Assessment of Empirical Criteria and Proposal of Novel Guidelines for Prediction of Solid Solution Stability

Carlucci,

Motta,

Casati

2023

Adv Eng Mater

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Refractory high‐entropy alloys (RHEAs) are a new class of metallic alloys which has been extensively studied in the last decade due to their excellent high‐temperature performances. However, the design of new lightweight and ductile RHEAs is a challenging task, since an extensive exploration of the immense compositional space of multicomponent systems is practically impossible. Aiming to reduce the experimental effort, several research groups have proposed different predictive criteria to design new high‐performing HEAs. Nevertheless, the criteria proposed so far are often based on a limited amount of data and, generally, do not differentiate between refractory and non‐refractory HEAs. To overcome these limitations, in this study we have developed a comprehensive database of properties of 265 RHEAs reported in the open literature from 2010 to 2022. Such database has been used to assess the validity of predictive empirical criteria and new guidelines for the prediction of solid solution stability in RHEAs have been proposed.This article is protected by copyright. All rights reserved.

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Section: Databasementioning

confidence: 99%

High‐Throughput Design of Refractory High‐Entropy Alloys: Critical Assessment of Empirical Criteria and Proposal of Novel Guidelines for Prediction of Solid Solution Stability

Carlucci,

Motta,

Casati

2023

Adv Eng Mater

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“…The presence of some individual Zr 2 Al-typed Laves phase particles observed inside the BCC grain could contribute to its good strength-ductility balance [16]. However, with a further reduction in the Zr content, the compression strain of AlNbTiVZr 0.25 HEA declined to 6% due to the segregation of Al and Zr elements at the grain boundary and the formation of the Zr 5 Al 3 phase [17].…”

Section: Introductionmentioning

confidence: 99%

The Effects of the Al and Zr Contents on the Microstructure Evolution of Light-Weight AlxNbTiVZry High Entropy Alloy

Yan,

Liu,

et al. 2023

Materials

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To investigate the comprehensive effects of the Al and Zr element contents on the microstructure evolution of the AlNbTiVZr series light-weight refractory high entropy alloys (HEAs), five samples were studied. Samples with different compositions were designated Al1.5NbTiVZr, Al1.5NbTiVZr0.5, AlNbTiVZr, AlNbTiVZr0.5, and Al0.5NbTiVZr0.5. The results demonstrated that the actual density of the studied HEA samples ranged from 5.291 to 5.826 g·cm−3. The microstructure of these HEAs contains a solid solution phase with a BCC structure and a Laves phase. The Laves phase was further identified as the ZrAlV intermetallic compound by TEM observations. The microstructure of the AlNbTiVZr series HEAs was affected by both the Al and Zr element contents, whereas the Zr element showed a more dominant effect due to Zr atoms occupying the core position of the ZrAlV Laves phase (C14 structure). Therefore, the as-cast Al0.5NbTiVZr0.5 sample exhibits the best room temperature compression property with a compression strength (σp) of 1783 MPa and an engineering strain of 28.8% due to having the lowest ZrAlV intermetallic compound area fraction (0.7%), as characterized by the EBSD technique.

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“…With the rapid development of high-temperature sectors such as the aerospace and power generation industries, the demand for metallic materials that maintain exceptional mechanical properties under high-temperature conditions has significantly increased. Recent studies have revealed that refractory high-entropy alloys (RHEAs) based on refractory elements such as tungsten (W), molybdenum (Mo), niobium (Nb), and tantalum (Ta) exhibit superior high-temperature strength and good fatigue resistance, surpassing the currently used nickel-based superalloys [ 4 , 5 ]. However, RHEAs, such as the MoNbTaVW alloy [ 6 ], typically have high densities and exhibit brittleness at room temperature, which limits their application scope.…”

Section: Introductionmentioning

confidence: 99%

Effect of Al Content on Microstructure and Properties of AlxCr0.2NbTiV Refractory High-Entropy Alloys

Li,

Zhang

et al. 2024

Entropy

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High-temperature creep refers to the slow and continuous plastic deformation of materials under the effects of high temperatures and mechanical stress over extended periods, which can lead to the degradation or even failure of the components’ functionality. AlxCr0.2NbTiV (x = 0.2, 0.5, or 0.8) refractory high-entropy alloys were fabricated by arc melting. The effects of Al content on the microstructure of AlxCr0.2NbTiV alloys were studied using X-ray diffraction, scanning electron microscopy, and electron backscatter diffraction. The microhardness, compression properties, and nanoindentation creep properties of AlxCr0.2NbTiV alloys were also tested. The results show that the AlxCr0.2NbTiV series exhibits a BCC single-phase structure. As the Al content increases, the lattice constant of the alloys gradually decreases, and the intensity of the (110) crystal plane diffraction peak increases. Adding aluminum enhances the effect of solution strengthening; however, due to grain coarsening, the microhardness and room temperature compressive strength of the alloy are only slightly improved. Additionally, because the effect of solution strengthening is diminished at high temperatures, the compressive strength of the alloy at 1000 °C is significantly reduced. The creep mechanism of the alloys is predominantly governed by dislocation creep. Moreover, increasing the Al content helps to reduce the sensitivity of the alloy to the loading rate during the creep process. At a loading rate of 2.5 mN/s, the Al0.8Cr0.2NbTiV alloy exhibits the lowest creep strain rate sensitivity index (m), which is 0.0758.

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On the yield stress anomaly in a B2-ordered refractory AlNbTiVZr0.25 high-entropy alloy

Cited by 11 publications

References 25 publications

High‐Throughput Design of Refractory High‐Entropy Alloys: Critical Assessment of Empirical Criteria and Proposal of Novel Guidelines for Prediction of Solid Solution Stability

High‐Throughput Design of Refractory High‐Entropy Alloys: Critical Assessment of Empirical Criteria and Proposal of Novel Guidelines for Prediction of Solid Solution Stability

The Effects of the Al and Zr Contents on the Microstructure Evolution of Light-Weight AlxNbTiVZry High Entropy Alloy

Effect of Al Content on Microstructure and Properties of AlxCr0.2NbTiV Refractory High-Entropy Alloys

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