Design and characterization of eutectic refractory high entropy alloys

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

doi:10.1016/j.mtla.2021.101057

Cited by 45 publications

(10 citation statements)

References 94 publications

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“…A total of 80 alloys with the highest sum of the specific yield strength at 20 °C, 600 °C and 800 °C were chosen. Their phase compositions were calculated using a Thermo-Calc (version 2020a) and a TCHEA3 database (High Entropy Alloys version 3.1) for 1200 °C since this temperature is usually used for homogenization annealing of Al-Cr-Nb-Ti-V-Zr RHEAs [ 51 , 52 , 53 , 54 , 55 , 56 , 57 , 58 , 59 , 60 , 61 , 62 ]. As a result, six model alloys were selected ( Table 2 ).…”

Section: Methodsmentioning

confidence: 99%

“…Therefore, in this work, we have employed the machine learning method to predict mechanical properties of Al-Cr-Nb-Ti-V-Zr system RHEAs. Some of these alloys have already demonstrated high specific strength at T ≤ 800 °C in combination with reasonable ductility [ 51 , 52 , 53 , 54 , 55 , 56 , 57 , 58 , 59 , 60 , 61 , 62 ]. In addition to the machine learning prediction of the yield strength at room temperature, 600 °C and 800 °C, a combination of phenomenological criteria and CALPHAD modeling was used to screen alloys with a predominantly single-phase structure to ensure reasonable ductility.…”

Section: Introductionmentioning

confidence: 99%

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Machine Learning-Based Strength Prediction for Refractory High-Entropy Alloys of the Al-Cr-Nb-Ti-V-Zr System

Клименко

Stepanov

et al. 2021

Materials

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The aim of this work was to provide a guidance to the prediction and design of high-entropy alloys with good performance. New promising compositions of refractory high-entropy alloys with the desired phase composition and mechanical properties (yield strength) have been predicted using a combination of machine learning, phenomenological rules and CALPHAD modeling. The yield strength prediction in a wide range of temperatures (20–800 °C) was made using a surrogate model based on a support-vector machine algorithm. The yield strength at 20 °C and 600 °C was predicted quite precisely (the average prediction error was 11% and 13.5%, respectively) with a decrease in the precision to slightly higher than 20% at 800 °C. An Al13Cr12Nb20Ti20V35 alloy with an excellent combination of ductility and yield strength at 20 °C (16.6% and 1295 MPa, respectively) and at 800 °C (more 50% and 898 MPa, respectively) was produced based on the prediction.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Machine Learning-Based Strength Prediction for Refractory High-Entropy Alloys of the Al-Cr-Nb-Ti-V-Zr System

Клименко

Stepanov

et al. 2021

Materials

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“…Mechanical compression tests of alloy samples were conducted at temperatures of 22-1000°С and a strain rate of 10 -4 s -1 . A more detailed description of the techniques used can be found in [6][7][8][9][10][11].…”

Section: Methodsmentioning

confidence: 99%

“…The potential of eutectic refractory HEAs as advanced high-temperature materials was studied using the CALPHAD method (CALculation of PHAse Diagrams) on a number of alloys of the Al-Cr-Nb-Ti-Zr system [11]. The alloys were designed by analyz-ing equilibrium and nonequilibrium phase diagrams in several stages: from the determination of singlephase composition of Nb 30 Ti 40 Zr 30 to the description of a eutectic reaction in quasi-binary system Al 15+x Cr 20 Nb 15 Ti 40-x Zr 10 (Fig.…”

Section: Development and Investigation Of Al-cr-nb-ti-zr Eutectic Alloysmentioning

confidence: 99%

“…The replacement of Cr by Al in CrMo 0.5 NbTa 0.5 TiZr alloy led to a decrease in density from 8.2 to 7.4 g/cm 3 and an increase in specific strength at T ≤ 1000°С [5]. The competitive mechanical properties of HEAs of the Cr-Nb-Ti-V-Zr system and the possibility of further increasing their specific strength by introducing Al allowed the development of new compositions based on the extended Al-Cr-Nb-Ti-V-Zr system [6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

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Design and Characterization of Al-Cr-Nb-Ti-V-Zr High-Entropy Alloys for High-Temperature Applications

et al. 2021

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High-entropy alloys (HEAs) are a new class of metallic alloys without a principal component. These materials are attractive because of their unique structures and properties, including mechanical ones. Some of HEAs based on refractory metals are considered as advanced high-temperature materials. However, the development of new applicable compositions is complicated by poor understanding of relationships between the chemical and phase composition of HEAs and their effect on mechanical performance. Here we report the results of comprehensive studies of Al-Cr-Nb-Ti-V-Zr high-entropy alloys, particularly AlCr x NbTiVZr y (х = 0.00, 0.25, 0.50, 1.00, 1.50 at y = 0 and y = 0.0, 0.25, 0.50, 1.00, 1.50 at x = 0). The strength and ductility of such alloys are shown to have a complex relationship with the composition and order of the parent B2 phase, and the amount and nature of secondary phases (C14 Laves phase and zirconium aluminides). Some of the investigated alloys demonstrate high specific strength at T ≤ 800°C. AlNbTiVZr 0.25 alloy also has a stable microstructure and higher creep resistance at 600°C compared to existing creep-resistant alloys. Based on calculations of equilibrium and nonequilibrium phase diagrams by the CALPHAD method, we propose new Al-Cr-Nb-Ti-Zr alloy compositions with unique lamellar eutectic structure composed of the B2 and C14 Laves phases and with enhanced strength properties. The structure/property relationships and high-temperature deformation mechanisms of refractory HEAs with eutectic microstructure are analyzed.

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Thermodynamics‐Guided High‐Throughput Discovery of Eutectic High‐Entropy Alloys for Rapid Solidification

Han,

Sun,

Xia

et al. 2024

Advanced Science

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Excellent castability, significantly refined microstructure, and good mechanical properties make eutectic high‐entropy alloys (EHEAs) a natural fit for rapid solidification processes, e.g., additive manufacturing. Previous investigations have focused on developing EHEAs through trial and error and mixing known binary eutectic materials. However, eutectic compositions obtained from near‐equilibrium conditions do not guarantee a fully eutectic microstructure under rapid solidifications. In this work, a thermodynamically guided high‐throughput framework is proposed to design EHEAs for rapid solidification. Empirical formulas derived from past experimental observations and thermodynamic computations are applied and considered phase growth kinetics under rapid solidification (skewed phase diagram). The designed alloy candidate, Co25.6Fe17.9Ni22.4Cr19.1Ta8.9Al6.1 (wt.%), contains nanostructured eutectic lamellar and shows a high Vickers hardness of 675 Hv. In addition to this specific composition, the alloy design toolbox enables the development of new EHEAs for rapid solidification without the limitation of previous knowledge.

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Design and characterization of eutectic refractory high entropy alloys

Cited by 45 publications

References 94 publications

Machine Learning-Based Strength Prediction for Refractory High-Entropy Alloys of the Al-Cr-Nb-Ti-V-Zr System

Machine Learning-Based Strength Prediction for Refractory High-Entropy Alloys of the Al-Cr-Nb-Ti-V-Zr System

Design and Characterization of Al-Cr-Nb-Ti-V-Zr High-Entropy Alloys for High-Temperature Applications

Thermodynamics‐Guided High‐Throughput Discovery of Eutectic High‐Entropy Alloys for Rapid Solidification

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