Phase equilibria, microstructure, and high temperature oxidation resistance of novel refractory high-entropy alloys

Gorr, Bronislava; Azim, M.; Christ, H.‐J.; Mueller, Tim; Schliephake, Daniel; Heilmaier, Martin

doi:10.1016/j.jallcom.2014.11.012

Cited by 292 publications

(107 citation statements)

References 14 publications

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“…However, the production of such multicomponent alloys is a complex scientific and technological task. The most important technological factor ensuring the production of polymetallic high-entropic alloys in the solid state is a high degree of homogenization of the alloy in terms of chemical composition [6,7,10]. A sufficiently high cooling rate of the alloy in the liquid and solid states does not allow diffusion processes to develop, thus, leading to the formation of chemical compounds, i.e.…”

Section: Amandtmentioning

confidence: 99%

“…The presence of heterogeneous atoms of elements with different electronic structure, dimensions, and thermodynamic properties in the crystal lattice of HEAs leads to its significant distortion. This contributes to the structural strengthening of alloys and the thermodynamic stability of the properties of such materials [5][6][7][8]. The development of research on the nature of the formation of multicomponent highly entropic systems, the development of practically meaningful compositions of alloys based on them, is relevant for modern materials science.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of Cast High Entropy Alloys with a Low Specific Gravity by Centrifugal Metallothermic SHS-Methods

Санин¹,

Икорников²,

Андреев³

et al. 2017

AM&T

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For the last few years, the so-called high-entropy alloys (HEAs) have attracted considerable attention of researchers in the field of materials science of metallic materials. Their distinguishing feature is the presence of five or more elements with an equitonous concentration. However, the entire range of HEA-based materials and their possible properties have not been fully studied. Most studies of HEAs focus on determining the microstructure-properties relationship. Little attention has been paid to the study and development of new methods for obtaining HEAs. Yet, the production of such multicomponent alloys is a complex scientific and technological problem.The paper investigates the possibility of producing high-entropy cast alloys CoCrFeNiMnAl x and CuAlZrTi(L-Cr) x by the SHS-metallurgy methods, and presents the findings of the first positive experiment. The microstructure of the produced alloys is investigated. The analysis of the obtained data allows drawing a conclusion about the prospects of the materials under investigation and the method of their production for the formation of volumetric nanostructured materials. KeywordsСast high entropy alloys (HEAs); cast polymetallic alloys; centrifugal metallothermic SHS; SHS-metallurgy; combustion synthesis.

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Section: Amandtmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Synthesis of Cast High Entropy Alloys with a Low Specific Gravity by Centrifugal Metallothermic SHS-Methods

Санин¹,

Икорников²,

Андреев³

et al. 2017

AM&T

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“…These studies include both transition metal based [6,7,[14][15][16][17][18][19][20][21][22][23][24][25] and refractory metal based [26][27][28][29] HEA systems. In general, it was reported that elements that commonly oxidize in less-complex, conventional alloy systems (i.e., Ni, Mn, Cr, Al, Ti) also tend to preferentially oxidize in compositionally complex alloys.…”

Section: Introductionmentioning

confidence: 99%

“…The oxidation behavior was reported to be superior to that of similar Nb-based refractory alloys, with an oxide consisting of a combination of NbCrO 4 , TiO 2 , and Cr 2 O 3 . Likewise, Gorr et al [27,28] investigated the high temperature oxidation behaviors of a 20Nb-20Mo-20Cr-20Ti-20Al HEA with and without Si additions. It was reported that in general, the HEA without Si followed a linear oxide growth rate law and formed a porous, non-protective mix of various oxides.…”

Section: Introductionmentioning

confidence: 99%

Influence of Annealing on the Microstructures and Oxidation Behaviors of Al8(CoCrFeNi)92, Al15(CoCrFeNi)85, and Al30(CoCrFeNi)70 High-Entropy Alloys

Butler

Weaver

2016

Metals

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Abstract:The understanding of the oxidation behaviors of as-cast and annealed high-entropy alloys (HEAs) is currently limited. This work systematically investigates the influence of annealing on the microstructures and oxidation behaviors of AlCoCrFeNi-based HEAs. Annealing was found to alter the distribution of Al-rich phases which caused a change in the oxidation mechanisms. In general, all three of the investigated HEAs displayed some degree of transient oxidation at 1050 • C that was later followed by protective, parabolic oxide growth. The respective oxidation behaviors are discussed relative to existing oxide formation models for Ni-Cr-Al alloys.

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“…Even though refractory HEAs have superior high-temperature mechanical properties, the practical application of refractory alloys is hindered by high raw material cost, high density, poor ductility at room temperature, and poor oxidation behavior. [48,83,213,214] …”

mentioning

confidence: 99%

High‐Entropy Alloys: Potential Candidates for High‐Temperature Applications – An Overview

2017

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Multi-principal elemental alloys, commonly referred to as high-entropy alloys (HEAs), are a new class of emerging advanced materials with novel alloy design concept. Unlike the design of conventional alloys, which is based on one or at most two principal elements, the design of HEA is based on multi-principal elements in equal or near-equal atomic ratio. The advent of HEA has revived the alloy design perception and paved the way to produce an ample number of compositions with different combinations of promising properties for a variety of structural applications. Among the properties possessed by HEAs, sluggish diffusion and strength retention at elevated temperature have caught wide attention. The need to develop new materials for high-temperature applications with superior high-temperature properties over superalloys has been one of the prime concerns of the high-temperature materials research community. The current article shows that HEAs have the potential to replace Ni-base superalloys as the next generation hightemperature materials. This review focuses on the phase stability, microstructural stability, and high-temperature mechanical properties of HEAs. This article will be highly beneficial for materials science and engineering community whose interest is in the development and understanding of HEAs for high-temperature applications.

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Phase equilibria, microstructure, and high temperature oxidation resistance of novel refractory high-entropy alloys

Cited by 292 publications

References 14 publications

Synthesis of Cast High Entropy Alloys with a Low Specific Gravity by Centrifugal Metallothermic SHS-Methods

Synthesis of Cast High Entropy Alloys with a Low Specific Gravity by Centrifugal Metallothermic SHS-Methods

Influence of Annealing on the Microstructures and Oxidation Behaviors of Al8(CoCrFeNi)92, Al15(CoCrFeNi)85, and Al30(CoCrFeNi)70 High-Entropy Alloys

High‐Entropy Alloys: Potential Candidates for High‐Temperature Applications – An Overview

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