Effect of molybdenum content on the microstructure and corrosion behavior of FeCoCrNiMox high-entropy alloys

Dai, Cuixia; Zhao, Tianliang; Du, Cuiwei; Li, Yong; Zhang, Dawei

doi:10.1016/j.jmst.2019.10.020

Cited by 182 publications

(33 citation statements)

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“…Further detailed investigations are required to elucidate the presence of such a passive film and its composition. In particular, the element molybdenum dissolved in the solid solution is known to enhance the protective effect of the formed passive film ( Ref 17,19,26,27). All the investigated coatings show significantly higher corrosion current densities in the H 2 SO 4 electrolyte than in the NaCl electrolyte.…”

Section: Corrosion Behaviormentioning

confidence: 96%

“…However, a detrimental effect was observed for the alloy system CrFeCoNiMo investigated in NaCl and H 2 SO 4 electrolytes for high molybdenum contents due to an increased content of the r-phase (Ref 18). In accordance with many conventional alloys, the formation of passive films especially for Cr and Mo containing alloys is crucial for the corrosion resistance of HEAs (Ref 12,15,19).…”

Section: Introductionmentioning

confidence: 99%

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Influence of Aluminum and Molybdenum on the Microstructure and Corrosion Behavior of Thermally Sprayed High-Entropy Alloy Coatings

et al. 2021

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High-entropy alloys (HEAs) have shown a wide range of promising structural and functional properties. By the application of coating technology, an economical exploitation can be achieved. The high wear and corrosion resistance of HEAs make them particularly interesting for the application as protective coatings. Especially for alloys with a high chromium content, a high corrosion resistance has been revealed. For the current investigations, the equimolar HEA CrFeCoNi with a single-phase face centered cubic structure is considered as a base alloy system. To increase the corrosion resistance as well as the hardness and strength, the influence of the alloying elements aluminum and molybdenum is analyzed. For the current investigations, the high kinetic process high-velocity oxygen fuel thermal spraying (HVOF) has been considered to produce coatings with a low porosity and oxide content. Feedstock is produced by inert gas atomization. The influence of the alloy composition on the microstructure, phase formation and resulting property profile is studied in detail. A detailed analysis of the corrosion resistance and underlying mechanisms is conducted. The pitting and passivation behavior are investigated by potentiodynamic polarization measurements in NaCl and H2SO4 electrolyte. A distinct improvement of the corrosion resistance can be achieved for the alloy Al0.3CrFeCoNiMo0.2.

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Section: Corrosion Behaviormentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Influence of Aluminum and Molybdenum on the Microstructure and Corrosion Behavior of Thermally Sprayed High-Entropy Alloy Coatings

et al. 2021

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“…High entropy alloys (HEAs), namely the multicomponent alloys, have become a hotspot of material research since 2004 when proposed by Yeh et al [1] and Cantor et al [2]. Because they possess high thermal stability, superior physical and excellent mechanical properties, such as high hardness [3], high strength, and high ductility, especially at a cryogenic temperature [4,5], excellent wear resistance [6], and corrosion resistance [7], which make the HEAs the promising materials as components in structural and mechanical materials, particularly at cryogenic temperature. These special features have been on account of the high mixing entropy, sluggish diffusion, and severe lattice distortion.…”

Section: Introductionmentioning

confidence: 99%

Effect of Mo Element on the Mechanical Properties and Tribological Responses of CoCrFeNiMox High-Entropy Alloys

Liu

Xie

Cui

et al. 2021

Metals

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Certain amounts of precipitate in CoCrFeNiMox (simplified as Mox) is beneficial to the wear resistance; however, the optimal chemical content of Mo and the anti-wear mechanism behind it remains unclear. The Mox (x = 0, 0.3, 0.5, 1, 1.5 in molar ratio) high entropy alloys (HEAs) were manufactured, the evolution of their microstructure, mechanical, friction, and wear properties with Mo content was studied. The results displayed that the mechanical properties of the FCC solid solution were enhanced from Mo0 to Mo0.3, then kept unchanged till x = 1.5. The volume fraction of the precipitates increased with Mo content. The Mo1 presents the lower average friction coefficient and wear rate, attributed to the desired types, amount, size, distribution of the hard σ and μ phases in the ductile FCC solid solution. The detailed mechanism behind their tribological behaviors were discussed in the manuscript.

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“…Full characterization of the passive film composition was, however, not reported. In a recent publication, Dai et al 29 shed light on this topic. They studied the effect Mo content on the corrosion behavior of FeCoCrNiMo x .…”

Section: Alloy Composition and Passive Film Stabilitymentioning

confidence: 99%

A review on Corrosion of High Entropy Alloys: Exploring the Interplay Between Corrosion Properties, Alloy Composition, Passive Film Stability and Materials Selection

et al. 2022

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The corrosion resistance of high entropy alloys was reviewed in the present work. The main focus was to explore the correlation between alloy composition, passive film stability and corrosion properties and use this information to develop a materials selection procedure based on the Ashby approach. Corrosion current densities and pitting potentials were the main design parameters used to rank different alloys, based on a careful examination of data published in the literature, considering uniform and localized corrosion, respectively. The outputs of the selection process clearly indicated a strong dependence of the corrosion resistance on passive film stability, although microstructural homogeneity and uniform distribution of alloying elements should not be disregarded. Proper combinations of elements such as Co, Al, Ti, Mo and Cr, especially, are effective at enhancing the corrosion resistance of high entropy alloys.

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Effect of molybdenum content on the microstructure and corrosion behavior of FeCoCrNiMox high-entropy alloys

Cited by 182 publications

References 70 publications

Influence of Aluminum and Molybdenum on the Microstructure and Corrosion Behavior of Thermally Sprayed High-Entropy Alloy Coatings

Influence of Aluminum and Molybdenum on the Microstructure and Corrosion Behavior of Thermally Sprayed High-Entropy Alloy Coatings

Effect of Mo Element on the Mechanical Properties and Tribological Responses of CoCrFeNiMox High-Entropy Alloys

A review on Corrosion of High Entropy Alloys: Exploring the Interplay Between Corrosion Properties, Alloy Composition, Passive Film Stability and Materials Selection

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