Effect of aging treatment on microstructure and properties of high-entropy Cu0.5CoCrFeNi alloy

Lin, Chun-Ming; Tsai, Hung-Chin; Bor, Hui‐Yun

doi:10.1016/j.intermet.2010.03.030

Cited by 158 publications

(58 citation statements)

References 17 publications

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“…Several researchers have explored the influence the effect of copper (Cu) on the corrosion and electrochemical response of CCAs. [58][59][60] Hsu et al 58 investigated the corrosion behaviour of the FeCoNiCrCu x system (with x taken as 0, 0.5 and 1) in 0.6 M NaCl and observed that increasing Cu content resulted in a higher i corr , lower E corr and lower E pit values for this system (Fig. 8c).…”

Section: The Influence Of Different Alloying Elements On the Corrosiomentioning

confidence: 99%

Corrosion of high entropy alloys

Qiu¹,

Thomas²,

Gibson³

et al. 2017

npj Mater Degrad

385

133

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High entropy alloys represent a unique class of metal alloys, comprising nominally five or more elements in near equiatomic proportions. High entropy alloys have gained significant interest on the basis that the high configurational entropy of such alloy systems is purported to result in a single-phase solid solution structure. While such a single-phase structure can occur in unique systems, it is now appreciated that the definition of high entropy alloys can be broader, with systems comprising only four elements possible of forming single phases, and most five (or more) element systems actually being multi (>2) phases. To this end, the notion of compositionally complex alloys is a more general description, with the concise review herein focusing on the corrosion of compositionally complex alloys (inclusive of high entropy alloys). It is noted that generally, in spite of complex compositions and in many cases complicated microstructural heterogeneity, compositionally complex alloys are nominally corrosion-resistant. This is discussed and aspects of the status and needs are presented.

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Section: The Influence Of Different Alloying Elements On the Corrosiomentioning

confidence: 99%

Corrosion of high entropy alloys

Qiu¹,

Thomas²,

Gibson³

et al. 2017

npj Mater Degrad

385

133

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“…Composition gradients, large and non-uniform grain sizes, residual stresses, cracks and pores all decrease mechanical performance and should be reduced or eliminated before investing time for characterization. In limited studies where HEAs have been characterized in the annealed condition or where the material has been deformed to control the microstructure, important changes in phase constitution and properties are found [36,53,[55][56][57][58][59]. It is therefore essential to make experimental observations on material where effort is made to reduce or eliminate casting defects in HEAs.…”

Section: Characterization Of Heas: Special Requirements and Approachesmentioning

confidence: 99%

Exploration and Development of High Entropy Alloys for Structural Applications

Miracle

Miller

Senkov

et al. 2014

Entropy

801

336

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Abstract:We develop a strategy to design and evaluate high-entropy alloys (HEAs) for structural use in the transportation and energy industries. We give HEA goal properties for low (≤150 °C), medium (≤450 °C) and high (≥1,100 °C) use temperatures. A systematic design approach uses palettes of elements chosen to meet target properties of each HEA family and gives methods to build HEAs from these palettes. We show that intermetallic phases are consistent with HEA definitions, and the strategy developed here includes both single-phase, solid solution HEAs and HEAs with intentional addition of a 2nd phase for particulate hardening. A thermodynamic estimate of the effectiveness of configurational entropy to suppress or delay compound formation is given. A 3-stage approach is given to systematically screen and evaluate a vast number of HEAs by integrating high-throughput computations and experiments. CALPHAD methods are used to predict phase equilibria, and high-throughput experiments on materials libraries with controlled composition and microstructure gradients are suggested. Much of this evaluation can be done now, but key components (materials libraries with microstructure gradients and high-throughput tensile testing) are currently missing. Suggestions for future HEA efforts are given.

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“…The corrosion resistance of these alloys should be enhanced. For example, in the CoCrCu 0.5 FeNi HEA, the Cu-rich phase was successfully dissolved into an FCC matrix aging at 1,100 °C-1,350 °C, which resulted in better corrosion properties, compared with those aged at 350 °C-950 °C [33]. It is noteworthy that not all heat treatments are suitable to advance the corrosion resistance of HEAs, as the effect can sometimes be contrary to what was desired.…”

Section: Heat-treatment Effects On Corrosion Behavior Of Heasmentioning

confidence: 99%

“…It is noteworthy that not all heat treatments are suitable to advance the corrosion resistance of HEAs, as the effect can sometimes be contrary to what was desired. Examples are that several heat-treated HEAs, such as Al 0.5 CoCrFeNi [31] and CoCrCu 0.5 FeNi [33], were reported to be susceptible to corrosion in a 3.5wt.% NaCl solution. In these cases, the heat treatments did not homogenize the microstructure, but instead, promoted the formation and growth of Cr-rich and/or Cu-rich phases rather than forming single-phase microstructures.…”

Section: Heat-treatment Effects On Corrosion Behavior Of Heasmentioning

confidence: 99%

“…Such unique properties of HEAs make them good candidates for practical corrosion-resistant applications. A number of investigations on the corrosion behavior of HEAs have been reported, which revealed equivalent or superior corrosion resistance of HEAs in various aqueous environments, as compared with conventional corrosion-resistant alloys, such as 304 stainless steel (SS) [20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35].…”

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confidence: 99%

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Alloying and Processing Effects on the Aqueous Corrosion Behavior of High-Entropy Alloys

Tang

Huang

et al. 2014

Entropy

182

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Abstract:The effects of metallurgical factors on the aqueous corrosion behavior of highentropy alloys (HEAs) are reviewed in this article. Alloying (e.g., Al and Cu) and processing (e.g., heat treatments) effects on the aqueous corrosion behavior of HEAs, including passive film formation, galvanic corrosion, and pitting corrosion, are discussed in detail. Corrosion rates of HEAs are calculated using electrochemical measurements and the weight-loss method. Available experimental corrosion data of HEAs in two common solutions [sulfuric acid (0.5 M H 2 SO 4 ) and salt water (3.5 weight percent, wt.%, NaCl)], such as the corrosion potential (E corr ), corrosion current density (i corr ), pitting potential (E pit ), and passive region (ΔE), are summarized and compared with conventional corrosionresistant alloys. Possible directions of future work on the corrosion behavior of HEAs are suggested.

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Effect of aging treatment on microstructure and properties of high-entropy Cu0.5CoCrFeNi alloy

Cited by 158 publications

References 17 publications

Corrosion of high entropy alloys

Corrosion of high entropy alloys

Exploration and Development of High Entropy Alloys for Structural Applications

Alloying and Processing Effects on the Aqueous Corrosion Behavior of High-Entropy Alloys

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