Thermal stability of AlCoFeMnNi high-entropy alloy

Karati, Anirudha; Guruvidyathri, K.; Hariharan, V.; Murty, B.S.

doi:10.1016/j.scriptamat.2018.12.017

Cited by 77 publications

(24 citation statements)

References 11 publications

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“…Although many studies reported on the single-phase microstructure in HEAs, most of the alloys were investigated after homogenization treatments performed at elevated temperatures followed by a (rapid) cooling [3]. Only selected studies dealt with the phase stability after long-term exposure at intermediate temperatures [50][51][52]. In terms of potential applications, knowledge about the microstructure in a wide temperature range is however indispensable as the formation of additional, often undesired phases may lead to dramatic failures of technical components.…”

Section: Discussionmentioning

confidence: 99%

Formation of complex intermetallic phases in novel refractory high-entropy alloys NbMoCrTiAl and TaMoCrTiAl: Thermodynamic assessment and experimental validation

Müller

Gorr

Christ

et al. 2020

Journal of Alloys and Compounds

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In this work, we present the results of the thermodynamic assessment of two equiatomic refractory High Entropy Alloys (HEAs), namely TaMoCrTiAl and NbMoCrTiAl, in the temperature range between 700 and 1500°C. Particular attention is paid on the constitution of the intermetallic phases stable in these alloy systems. Thermodynamic calculations were performed using a self-developed thermodynamic database based on the CALPHAD (Calculation of Phase Diagram) approach. The details of the thermodynamic modelling and particular characteristics of the relevant phases within the Ta-Nb-Cr-Ti-Al system are presented. To verify the new database, the phase formation and stability of both quinary alloys in near-equilibrium conditions were studied experimentally by utilizing scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS) and electron backscatter diffraction (EBSD) as well as X-ray powder diffraction (XRD). Both equiatomic alloys reveal a complex microstructure including several intermetallic phases at intermediate temperatures. The alloy NbMoCrTiAl consists of an ordered B2 phase, Al(Mo, Nb)3 and two polytypes (C14 and C15) of the Cr2Nb Laves phase. Precipitations of Cr2Ta Laves phase (C14, C15 and C36-type) in the B2 matrix were observed in the alloy TaMoCrTiAl. Based on the results of thermodynamic calculations, it was concluded that: (i) Nb stabilizes the AlMo3 A15 phase in the alloy NbMoCrTiAl, (ii) Al and Ti play a crucial role in the formation of the ordered B2 phase in both alloys and (iii) the concentrations of Cr and/or Ta/Nb should be dramatically reduced to decrease the Laves phase volume fraction.

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Section: Discussionmentioning

confidence: 99%

Formation of complex intermetallic phases in novel refractory high-entropy alloys NbMoCrTiAl and TaMoCrTiAl: Thermodynamic assessment and experimental validation

Müller

Gorr

Christ

et al. 2020

Journal of Alloys and Compounds

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“…Irregular B2 and FCC phases were formed after 50 hours of heat treatment at 1050 °C. They reported that the absence of the embrittling σ-phase would lead to a general application of the alloy [103].…”

Section: Recent Progress In Heasmentioning

confidence: 99%

Yüksek Entropili Alaşımlar: üretimi, özellikleri ve kullanım alanları

Özkan¹,

Karaoğlanli²

2020

El-Cezeri Fen Ve Mühendislik Dergisi

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High entropy alloys (HEA) are composed of elements with atomic concentrations between 5% and 35%, unlike conventional alloys. This new generation of metallic materials has found utilization areas in many engineering applications due to their remarkable properties. High entropy effect, lattice distortion effect, sluggish diffusion effect, and cocktail effect are what give HEAs their properties. In addition to the mentioned effects, basic information regarding the definition, properties, production methods, utilization areas and recent studies of HEAs are given in this study. Furthermore, the recent developments in related areas such as the production of HEAs designed according to the targeted superior characteristics, transfer of outputs to applicable technologic fields, making the advantages of their superior features available in specific application areas such as military, defense and aerospace systems, were presented.

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“…The high mixing entropy of high-entropy alloys tends to form a solid solution; however, it is not easy to form an intermediate phase, which is important for the excellent properties of high-entropy alloys. High-entropy alloys have excellent thermal stability [18][19][20][21][22], radiation resistance [23][24][25][26], corrosion resistance [27][28][29][30][31][32][33][34][35], and mechanical properties [36][37][38][39][40][41][42]. High-entropy alloys are expected to be used in turbine blades and high-speed cutting tools, and lightweight high-entropy alloys [43] may be used in energy and transportation fields.…”

Section: Introductionmentioning

confidence: 99%

Influencing factors and mechanism of high-temperature oxidation of high-entropy alloys: A review

Pan

et al. 2021

Int J Miner Metall Mater

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High-temperature oxidation is a common failure in high-temperature environments, which widely occur in aircraft engines and aerospace thrusters; as a result, the development of anti-high-temperature oxidation materials has been pursued. Ni-based alloys are a common high-temperature material; however, they are too expensive. High-entropy alloys are alternatives for the anti-oxidation property at high temperatures because of their special structure and properties. The recent achievements of high-temperature oxidation are reviewed in this paper. The high-temperature oxidation environment, temperature, phase structure, alloy elements, and preparation methods of high-entropy alloys are summarized. The reason why high-entropy alloys have anti-oxidation ability at high temperatures is illuminated. Current research, material selection, and application prospects of high-temperature oxidation are introduced.

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Thermal stability of AlCoFeMnNi high-entropy alloy

Cited by 77 publications

References 11 publications

Formation of complex intermetallic phases in novel refractory high-entropy alloys NbMoCrTiAl and TaMoCrTiAl: Thermodynamic assessment and experimental validation

Formation of complex intermetallic phases in novel refractory high-entropy alloys NbMoCrTiAl and TaMoCrTiAl: Thermodynamic assessment and experimental validation

Yüksek Entropili Alaşımlar: üretimi, özellikleri ve kullanım alanları

Influencing factors and mechanism of high-temperature oxidation of high-entropy alloys: A review

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