Microstructural Characterization of Mechanically Alloyed FeCoNiMnV High Entropy Alloy Consolidated by Spark Plasma Sintering

Alijani, Fatemeh; Reihanian, M.; Gheisari, Kh.; Yuasa, Motohiro

doi:10.1002/adem.201901311

Cited by 4 publications

(2 citation statements)

References 51 publications

(153 reference statements)

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“…The presence of a small amount of V‐Mn precipitates, which are identified as σ phases, is also demonstrated in the following microstructure images ( Figure ) and SEM elemental maps ( Figure ) of CoFeNiMnV HEAs. [ 48 ] However, due to the relatively small content of the σ phase, the diffraction peaks of the σ phase could not be detected by XRD.…”

Section: Resultsmentioning

confidence: 99%

Effects of Cold Rolling and Annealing Treatment on Microstructure and Properties of CoFeNiMnV High‐Entropy Alloys

et al. 2022

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Herein, a combination of cold rolling (CR) and annealing treatment is used to investigate the evolution of the microstructure and mechanical properties of CoFeNiMnV high-entropy alloys (HEAs) fabricated by powder plasma arc additive manufacturing (PPA-AM). The deposited CoFeNiMnV HEAs exhibit a face-centered cubic (FCC) structure with a small amount of σ phase precipitation. After 50% CR, the microstructure of CoFeNiMnV HEAs is severely deformed along the rolling direction, and the grain size is obviously refined. Therefore, the hardness and strength of the alloy are significantly improved. The rolled CoFeNiMnV HEAs are annealed at 500, 700 and 900 °C, for 60 min. The results show that annealing at 500 °C has little effect on the microstructure and dislocation density of the alloy, and the alloy still maintains high strength and hardness. With increasing of annealing temperature to 700 and 900 °C, the dislocation density of the CoFeNiMnV HEAs is significantly reduced. Meanwhile the σ phase is gradually dissolved, and the recrystallized grains and annealing twins are significantly coarsened. The analysis suggests that it decreases the strength of the CoFeNiMnV HEAs, but increases the elongation. CoFeNiMnV HEAs annealed at 700 °C for 60 min after CR exhibit an excellent high strength-toughness combination.

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Section: Resultsmentioning

confidence: 99%

Effects of Cold Rolling and Annealing Treatment on Microstructure and Properties of CoFeNiMnV High‐Entropy Alloys

et al. 2022

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“…The role of contaminants during MA-SPS of HEAs has also been exemplified in literature (although the thermodynamic explanations using G-x plots have never been discussed). The quinary CoFeMnNiV alloy is reported to have σ-phase after MA and SPS, in which C or O contamination is avoided [33,34]. Praveen et al [22] have demonstrated that the unsolicited C addition during MA-SPS provides excellent phase stability and very high hardness to AlCoCrFe due to the formation of M 23 C 6 carbides.…”

Section: Absence Of σ-Phase After Ma-sps Of Cocrfemnniva Kinetic Pers...mentioning

confidence: 99%

Suppression of σ-phase in nanocrystalline CoCrFeMnNiV high entropy alloy by unsolicited contamination during mechanical alloying and spark plasma sintering

Vaidya

Karati

Guruvidyathri

et al. 2020

Materials Chemistry and Physics

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Accelerating the Exploration of High‐Entropy Alloys: Synergistic Effects of Integrating Computational Simulation and Experiments

Jiang,

Li,

Wang

et al. 2024

Small Structures

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High‐entropy alloys (HEAs) are novel materials composed of multiple elements with nearly equal concentrations and they exhibit exceptional properties such as high strength, ductility, thermal stability, and corrosion resistance. However, the intricate and diverse structures of HEAs pose significant challenges to understanding and predicting their behavior at different length scales. This review summarizes recent advances in computational simulations and experiments of structure‐property relationships in HEAs at the nano/micro scales. Various methods such as first‐principles calculations, molecular dynamics simulations, phase diagram calculations, and finite element simulations are discussed for revealing atomic/chemical and crystal structures, defect formation and migration, diffusion and phase transition, phase formation and stability, stress‐strain distribution, deformation behavior, and thermodynamic properties of HEAs. Emphasis is placed on the synergistic effects of computational simulations and experiments in terms of validation and complementarity to provide insights into the underlying mechanisms and evolutionary rules of HEAs. Additionally, current challenges and future directions for computational and experimental studies of HEAs are identified, including accuracy, efficiency, and scalability of methods, integration of multiscale and multiphysics models, and exploration of practical applications of HEAs.

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Microstructural Characterization of Mechanically Alloyed FeCoNiMnV High Entropy Alloy Consolidated by Spark Plasma Sintering

Cited by 4 publications

References 51 publications

Effects of Cold Rolling and Annealing Treatment on Microstructure and Properties of CoFeNiMnV High‐Entropy Alloys

Effects of Cold Rolling and Annealing Treatment on Microstructure and Properties of CoFeNiMnV High‐Entropy Alloys

Suppression of σ-phase in nanocrystalline CoCrFeMnNiV high entropy alloy by unsolicited contamination during mechanical alloying and spark plasma sintering

Accelerating the Exploration of High‐Entropy Alloys: Synergistic Effects of Integrating Computational Simulation and Experiments

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