High-Temperature Oxidation Behavior of Al-Co-Cr-Ni-(Fe or Si) Multicomponent High-Entropy Alloys

Butler, T.M.; Alfano, Joel; Martens, R. L.; Weaver, M.L.

doi:10.1007/s11837-014-1185-7

Cited by 178 publications

(73 citation statements)

References 56 publications

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“…The scale morphologies resulting from oxidation exposures of the HEAs studied here differ significantly from a recent study on the oxidation of AlCoCrNiFe and AlCoCrNiSi alloys by Butler et al 20 Depending on the Al alloy content, the Butler alloys either formed a discontinuous Cr 2 O 3 external scale with Al 2 O 3 internal oxides (low Al), or a continuous Al 2 O 3 external scale (high Al). In contrast, the oxidation exposures studied here depended upon the relative amounts of Cr and Mn in the alloy.…”

Section: Discussioncontrasting

confidence: 74%

Oxidation of CoCrFeMnNi High Entropy Alloys

Holcomb

Tylczak

Carney

2015

JOM

179

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Eight model high entropy alloys (HEAs) in the CoCrFeMnNi family (including one alloy each in the CoCrFeNi and CoFeMnNi subfamilies) were made, prepared, and exposed to laboratory air for 1100 h at 650°C and 750°C. Two commercial alloys, nickel-base superalloy 230 (N06230) and austenitic stainless steel 304H (S30409), were simultaneously exposed for comparison. Mass change oxidation kinetics were measured and cross-sections of exposed samples were observed. Seven of these HEAs contained much more Mn (12-24 wt.%) than is found in commercial heat-resistant stainless steels and superalloys. The oxidation resistance of CoCrFeNi was excellent and comparable to 304H at 650°C and only slightly worse at 750°C. The thin oxide scale on CoCrFeNi was primarily Cr oxide (presumably Cr 2 O 3 ) with some Mn oxide at the outer part of the scale. The CoCrFeMnNi HEAs all experienced more rapid oxidation than CoCrFeNi and, especially at 750°C, experienced oxide scale spallation. The addition of Y in the alloy to lower S improved the oxidation resistance of these HEAs. Alloy CoFeMnNi, without Cr, experienced much higher oxidation rates and scale spallation than the Cr-containing alloys. A linear regression analysis of the log of the parabolic rate constant, log(k p ), as functions of wt.% Cr and Mn found a good correlation for the compositional dependence of the oxidation rate constant, especially at 650°C. Mn was found to be more detrimental increasing log(k p ) than Cr was helpful reducing log(k p ). If CoCrFeMnNi HEAs are to be used in high temperature oxidizing environments, then examining lower levels of Mn, while maintaining Cr levels, should be pursued.

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Section: Discussioncontrasting

confidence: 74%

Oxidation of CoCrFeMnNi High Entropy Alloys

Holcomb

Tylczak

Carney

2015

JOM

179

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“…Bulter et al [225] investigated the oxidation behavior of Al 10 resulted in better oxidation resistance in the Al20-S HEA than the Al 10 HEA. They concluded that long-term oxidation behavior of these alloys depends on the Al and/or Cr contents in the subsurface and the depth of elemental depletion due to the oxide scale formation.…”

Section: High-temperature Oxidation and Hot Corrosion Resistancementioning

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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“…It is well-known that these alloys typically form phases with simple FCC, BCC, and HCP crystal structures and can contain ordered intermetallic phases [4]. HEAs also exhibit the inherent potential to be alloyed with high concentrations of Al and/or Cr to promote enhanced oxidation resistances without necessarily forming various intermetallic phases that can be deleterious to strength [5][6][7]. In addition, HEAs have been reported to exhibit sluggish diffusion kinetics [8][9][10] and high thermal stabilities [11][12][13], making them ideal candidates for use in high temperature applications.…”

Section: Introductionmentioning

confidence: 99%

“…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%

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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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High-Temperature Oxidation Behavior of Al-Co-Cr-Ni-(Fe or Si) Multicomponent High-Entropy Alloys

Cited by 178 publications

References 56 publications

Oxidation of CoCrFeMnNi High Entropy Alloys

Oxidation of CoCrFeMnNi High Entropy Alloys

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

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

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