Oxidation behavior of high-entropy alloys AlxCoCrFeNi (x=0.15, 0.4) in supercritical water and comparison with HR3C steel

Liu, Yixuan; Cheng, Chuan; Shang, Jian-lu; Wang, Rui; Li, Peng; Zhao, Jie

doi:10.1016/s1003-6326(15)63733-5

Cited by 115 publications

(41 citation statements)

References 27 publications

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“…B2 and sigma) [9][10][11][12][13]. HEAs have been reported to exhibit a variety of unique properties including enhanced mechanical strength, at both ambient and elevated temperatures [9][10][11][14][15][16] and resistance in oxidizing/corrosive environments [9,[17][18][19][20][21][22][23][24][25][26][27][28][29][30]. These attributes, amongst others, make them ideal candidates as materials for use in high temperature environments.…”

Section: Introductionmentioning

confidence: 99%

“…The aim of this work is to fundamentally investigate the high temperature phases in a series of heat treated AlNiCoCrFe based HEAs and evaluate the accuracy of CALPHAD based predictions using ThermoCalc TM [54]. This particular system is ideal for this fundamental phase study since it is one of the most thoroughly investigated HEA systems [11,15,16,29,38,50,[55][56][57][58][59][60][61].…”

Section: Introductionmentioning

confidence: 99%

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Investigation of the phase stabilities in AlNiCoCrFe high entropy alloys

Butler

Weaver

2017

Journal of Alloys and Compounds

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High-entropy alloys (HEAs) are a developing class of materials that show great potential for a variety of commercial structural and coating applications, particularly where heat and corrosion resistance are desired. In these types of applications, the relative phase stabilities play a crucial role, since they influence the material design process and expected component lifetimes.However, a satisfactory understanding of the phase stabilities in HEAs and the ability to thermodynamically predict their behaviors is limited. This study methodically couples analytical characterization techniques with predictions based on CALPHAD models to investigate the phase equilibria and phase stabilities of a series of AlNiCoCrFe based HEAs. Heat treatments were conducted at 700°C for 1000 hours and 1050°C for 520 hours, followed by water quenching, to ensure adequate time for metastable equilibrium to be achieved. The accuracy and merit of the thermodynamic simulations in predicting the stable phases and their respective chemistries is discussed relative to the experimental observations.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigation of the phase stabilities in AlNiCoCrFe high entropy alloys

Butler

Weaver

2017

Journal of Alloys and Compounds

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“…Therefore, the oxidation behavior of the Al x CoCrFeNi (x = 0.15 and 0.4) HEAs, compared with the HR3C steel (25Cr-20Ni-Nb-N) in the supercritical water at 550 and 600 • C was investigated [20]. The surface morphologies showed that in all the alloys, spinel-type (Fe, Cr) 3 O 4 oxides formed the dense oxide films.…”

Section: Corrosion Behavior In High-temperature High-pressure Watermentioning

confidence: 99%

Corrosion-Resistant High-Entropy Alloys: A Review

Shi

Yang

Liaw

2017

Metals

650

205

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Corrosion destroys more than three percent of the world's gross domestic product. Therefore, the design of highly corrosion-resistant materials is urgently needed. By breaking the classical alloy-design philosophy, high-entropy alloys (HEAs) possess unique microstructures, which are solid solutions with random arrangements of multiple elements. The particular locally-disordered chemical environment is expected to lead to unique corrosion-resistant properties. In this review, the studies of the corrosion-resistant HEAs during the last decade are summarized. The corrosion-resistant properties of HEAs in various aqueous environments and the corrosion behavior of HEA coatings are presented. The effects of environments, alloying elements, and processing methods on the corrosion resistance are analyzed in detail. Furthermore, the possible directions of future work regarding the corrosion behavior of HEAs are suggested.

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“…This particular alloy system is ideal for a fundamental oxidation study since it contains both Al and Cr, which are known to produce protective Cr 2 O 3 and/or Al 2 O 3 scales [30]. Additionally, the AlCoCrFeNi system is one of the most thoroughly investigated to date [1,4,10,14,[31][32][33][34][35][36][37][38][39][40][41][42][43]. This paper will systematically report the influence of annealing on the microstructures and active oxidation mechanisms.…”

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%

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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Oxidation behavior of high-entropy alloys AlxCoCrFeNi (x=0.15, 0.4) in supercritical water and comparison with HR3C steel

Cited by 115 publications

References 27 publications

Investigation of the phase stabilities in AlNiCoCrFe high entropy alloys

Investigation of the phase stabilities in AlNiCoCrFe high entropy alloys

Corrosion-Resistant High-Entropy Alloys: A Review

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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