Oxidation Behavior of Al8Co17Cr17Cu8Fe17Ni33, Al23Co15Cr23Cu8Fe15Ni15, and Al17Co17Cr17Cu17Fe17Ni17 Compositionally Complex Alloys (High‐Entropy Alloys) at Elevated Temperatures in Air

Daoud, Haneen; Manzoni, Anna M.; Völkl, Rainer; Wanderka, N.; Glatzel, Uwe

doi:10.1002/adem.201500179

Cited by 71 publications

(18 citation statements)

References 21 publications

(38 reference statements)

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“…They have also been considered for high-temperature applications due to their supposed sluggish diffusion kinetics and softening resistance at elevated temperatures (Ref 6,7). This has led to hightemperature oxidation studies of several HEA systems, such as CoCrFeMnNi, AlCoCrFeNi and AlCoCrCuFeNi (Ref [8][9][10][11][12][13][14]. These investigations have also been carried out on high-entropy materials consisting of elements that constitute refractory alloys, e.g., Ti, Ta, Mo, Nb, Hf, Cr and Zr (Ref [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Oxidation Resistance of Ti-Al-Cr-Nb-Based High-Entropy Alloys in Air at 1073 K

Gaweł

Rogal

Przybylski

2019

J. of Materi Eng and Perform

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The effects of prolonged exposure to air at 1073 K on Al20Cr25Nb20Ti20Zr15 and Al20Cr25Nb19-Ti20Zr15Y1 (at.%) high-entropy alloys (HEAs) were investigated in this work. Combined scanning electron microscopy and energy-dispersive x-ray spectroscopy (SEM-EDS) analysis revealed that scales containing all major elements in the systems are formed during the oxidation process. Thermogravimetric analysis carried out under the above-mentioned corrosive conditions indicates an initial parabolic kinetics course in the case of the sample with 1 at.% Y addition. However, after a certain period of time, the correlation between mass gain per unit surface area and time becomes linear. In the other case, oxidation proceeds according to the parabolic rate law for the entire process duration. The addition of 1 at.% Y decreases the parabolic rate constants by 1 order of magnitude, thereby improving the chemical stability of the studied Al-Cr-Nb-Ti-Zr system. This is confirmed by visual evaluation, as well as SEM-EDS cross-sectional analysis. Additionally, x-ray diffraction studies indicate that a multiphase oxide scale is formed on the metallic core of both samples. This means that selective oxidation does not occur and all constituent elements took part in the reaction. Taking all of the above into account, it can be concluded that more research is required to fully understand and improve the corrosion resistance of Ti-Al-Cr-Nb-based HEAs.

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Section: Introductionmentioning

confidence: 99%

Oxidation Resistance of Ti-Al-Cr-Nb-Based High-Entropy Alloys in Air at 1073 K

Gaweł

Rogal

Przybylski

2019

J. of Materi Eng and Perform

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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%

“…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. For example, Daoud et al [23] Ni 17 HEAs at 800 • C and 1000 • C in air. At 800 • C, the low Al content alloy formed a combination of NiO, Fe-oxide, Cr 2 O 3 , and Al 2 O 3 .…”

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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“…[33] Due to the ambiguity over the role of entropy in solid solution formation, a few research groups have suggested referring the HEAs as multi-principal element alloys (MPEAs), baseless alloys, concentrated solid solution alloys (CSAs), and compositionally complex alloys (CCAs). [6,30,[34][35][36][37][38][39][40] Regardless of multiple phases or compound formation, it is worth mentioning that the significant concentration of various elements is present in the secondary phases/compounds. Besides, HEAs are established to have four inherent characteristics.…”

Section: Introductionmentioning

confidence: 99%

“…They observed the better compressive properties when the sample was annealed at 1000 C for 24 h. They concluded that the high ultimate tensile strength after annealing was mainly due to the disordering of FCC phase which can sustain more deformation than the ordered structure. Xian et al [220] developed a new V 35 Ti 33 Fe 15 Cr 10 Zr 5 HEA with single BCC phase for fusion reactors in the temperature range of 25-900 C. The yield strength of the alloy increased with increasing temperature below 500…”

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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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Oxidation Behavior of Al₈Co₁₇Cr₁₇Cu₈Fe₁₇Ni₃₃, Al₂₃Co₁₅Cr₂₃Cu₈Fe₁₅Ni₁₅, and Al₁₇Co₁₇Cr₁₇Cu₁₇Fe₁₇Ni₁₇ Compositionally Complex Alloys (High‐Entropy Alloys) at Elevated Temperatures in Air

Abstract: Oxidation behavior of the compositionally complex alloys (high-entropy alloys) Al

Cited by 71 publications

References 21 publications

Oxidation Resistance of Ti-Al-Cr-Nb-Based High-Entropy Alloys in Air at 1073 K

Oxidation Resistance of Ti-Al-Cr-Nb-Based High-Entropy Alloys in Air at 1073 K

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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