Thermodynamic design of high-entropy refractory alloys

Melnick, A. B.; Soolshenko, V.K.

doi:10.1016/j.jallcom.2016.09.189

Cited by 59 publications

(20 citation statements)

References 27 publications

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“…Regular solution model has been adopted in order to simplify the calculation of (2) and minimization of ∆G on element concentrations [26]. Thus, it is possible to obtain the most stable multicomponent solutions.…”

Section: G H T S ∆ = ∆ − ∆mentioning

confidence: 99%

Thermodynamic Prediction of Phase Composition of Transition Metals High-Entropy Alloys

Melnick¹,

Soolshenko²,

Levchuk³

2020

Metallofiz. Noveishie Tekhnol.

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Compositions with minimal Gibbs free energy for single-and multi-phase high-entropy alloys (HEAs) containing Ni, Co, Fe, Cr, Cu, Al, Mn, Ti, Zr, V elements are developed using a developed thermodynamic approach. The phase compositions for some equiatomic HEAs are predicted and the influence of various factors on its formation are described. A correlation between theoretical and experimental data is obtained. Criteria for search of HEAs compositions favourable for formation of single-phase and multi-phase solid solutions are formulated.

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Section: G H T S ∆ = ∆ − ∆mentioning

confidence: 99%

Thermodynamic Prediction of Phase Composition of Transition Metals High-Entropy Alloys

Melnick¹,

Soolshenko²,

Levchuk³

2020

Metallofiz. Noveishie Tekhnol.

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“…Compositions for HEAs with minimal Gibbs free energy were ob-tained based on thermodynamic approach developed in the article [24], where substitutional solid solutions were considered with the regular-solution approximation. The parameters for expression (2) were determined as follow.…”

Section: Modellingmentioning

confidence: 99%

“…Regular solution model has been adopted in order to simplify the calculation of (2) and for minimization of G on element concentrations [24]. Thus, it is possible to obtain the most stable multicomponent solutions.…”

Section: Introductionmentioning

confidence: 99%

Modelling of Transition Metal High-Entropy Solid Solutions

2019

Nanosist. Nanomater. Nanotehnol.

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The compositions of high-entropy alloys based on the elements Ni, Co, Fe, Cr, Mn, Ti, V, Cu, Al, Zr, and Si are evaluated with use of thermodynamic approach. Optimal compositions for alloys with minimal Gibbs energy are obtained, and influence of various factors on formation of the alloys is described. As shown, the most stable alloys are nonequiatomic. The compositions for alloys, which will be in the state of homogeneous multicomponent solid solutions, are determined. Композиції для високоентропійних стопів на основі елементів Ni, Co, Fe, Cr, Mn, Ti, V, Cu, Al, Zr, Si оцінювали з використанням термодинамічного підходу. Одержано оптимальні концентрації для стопів з мінімальною Ґіббсовою енергією та описано вплив різних чинників на їх формування. Показано, що найстабільніші стопи не є еквіатомовими. Визначено склади стопів, які перебуватимуть у стані однорідних багатокомпонентних твердих розчинів. Составы высокоэнтропийных сплавов на основе элементов Ni, Co, Fe, Cr, Mn, Ti, V, Cu, Al, Zr, Si рассматривались с использованием термодинамического подхода. Получены оптимальные концентрации для сплавов с минимальной энергией Гиббса и описано влияние различных факторов на их формирование. Было показано, что наиболее стабильные сплавы не являются эквиатомными. Определены составы сплавов, которые будут находиться в состоянии однородных многокомпонентных твёрдых растворов.

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“…Refractory high-entropy alloys (RHEAs) are considered to be a new generation of high-temperature materials, because they have the advantages of both high-entropy alloys (HEAs) and refractory metals (RMs), such as high-temperature strength, high hardness, and good phase stability at high temperatures [1][2][3][4][5][6][7]. They are mainly composed of Mo, Nb, Ta, and W, while Ti, Cr, V, Si, and Al are usually used as strengthening alloy elements [8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Composition Evolution of a Fused Slurry Silicide Coating on MoNbTaTiW Refractory High-Entropy Alloy in High-Temperature Oxidation Environment

Han

Zhang

et al. 2020

Materials

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In this paper, the Si-20Cr-20Fe coating was prepared on MoNbTaTiW RHEA by a fused slurry method. The microstructural evolution and compositions of the silicide coating under high-temperature oxidation environment were studied. The results show that the silicide coating could effectively prevent the oxidation of the MoNbTaTiW RHEA. The initial silicide coating had a double-layer structure: a high silicon content layer mainly composed of MSi2 as the outer layer and a low silicon content layer mainly contained M5Si3 as the inner layer. Under high-temperature oxidation conditions, the silicon element diffused from the silicide coating to the RHEA substrate while the oxidation of the coating occurred. After oxidation, the coating was composed of an outer oxide layer and an inner silicide layer. The silicide layer moved toward the inside of the substrate, led to the increase of its thickness. Compared with the initial silicified layer, its structure did not change significantly. The structure and compositions of the oxide layer on the outer surface strongly depended on the oxidation temperature. This paper provides a strategy for protecting RHEAs from oxidation at high-temperature environments.

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Thermodynamic design of high-entropy refractory alloys

Cited by 59 publications

References 27 publications

Thermodynamic Prediction of Phase Composition of Transition Metals High-Entropy Alloys

Thermodynamic Prediction of Phase Composition of Transition Metals High-Entropy Alloys

Modelling of Transition Metal High-Entropy Solid Solutions

Microstructure and Composition Evolution of a Fused Slurry Silicide Coating on MoNbTaTiW Refractory High-Entropy Alloy in High-Temperature Oxidation Environment

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