Diffusion in High Entropy Alloy Systems – A Review

Verma, Vivek; Belcher, Calvin H.; Apelian, Diran; Lavernia, Enrique J.

doi:10.1016/j.pmatsci.2024.101245

Cited by 11 publications

(3 citation statements)

References 102 publications

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“…The concept of high-entropy alloy [11,12] was proposed in 2004, which is composed of 5 or more main elements, and the alloy obtained by mixing multiple elements in a near/equal atomic ratio does not form complex intermetallic compounds, but forms a simple solid solution structure. Compared with traditional alloys, it has a unique phase structure and alloy composition, which significantly improves the microstructure and properties of the alloy.…”

Section: Introductionmentioning

confidence: 99%

Wear performance of FeCuMoTiV high entropy alloy coatings by laser cladding

Li,

He,

Wang

et al. 2024

Surf. Topogr.: Metrol. Prop.

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FeCuMoTiV high-entropy alloy coatings were prepared on the surface of aluminum matrix composites using the laser cladding technique. The physical phase composition of the coating, the hardness of each physical phase, and the friction and wear behavior of the coating were studied in detail. The results show that: From the XRD and TEM analysis, the coating’s physical phases, BCC1(MoV) and BCC2(TiFe), are coherent. From the EBSD analysis, the grains of the coating have no obvious selective orientation, and the average equivalent circle diameter is 26.44 μm. Nanomechanical tests showed that the average hardness of the BCC1 phase in the coating was 7831.2 N mm−2, which provided the coating with excellent abrasion resistance. The average coefficient of friction of the coating showed a tendency to decrease and then increase with the increase of time, and it floated in the range of 0.3 ± 0.05. The coating forms a structure containing Fe2O3, MoO3, CuO, and TiO2 mixed oxide ‘glaze layer’ on the wear surface, which provides good lubrication. Combined with SEM analysis, the wear mechanism of the coating is a mixture of abrasive wear, oxidative wear, adhesive wear, and fatigue wear.

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Section: Introductionmentioning

confidence: 99%

Wear performance of FeCuMoTiV high entropy alloy coatings by laser cladding

Li,

He,

Wang

et al. 2024

Surf. Topogr.: Metrol. Prop.

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“…Unlike conventional alloys, HEAs are formed with elements used in equal or close proportions (Sonar et al, 2024). Four main factors make high entropy alloys important: the high entropy effect (Dewangan et al, 2022), slow diffusion effect (Verma et al, 2024), lattice distortion (Wang et al, 2024), and cocktail effect (Wang et al, 2023). The high entropy effect reduces the free energy of solid solution phases in the alloy, facilitating their formation at high temperatures (Yu et al, 2024).…”

Section: Introductionmentioning

confidence: 99%

“…The high entropy effect reduces the free energy of solid solution phases in the alloy, facilitating their formation at high temperatures (Yu et al, 2024). The slow diffusion effect arises since each atom in each lattice site within the alloy is different from its neighboring atoms and this leads to different local energy levels within the lattice, hence diffusion is slow in HEAs (Verma et al, 2024). Lattice distortion occurs due to the atoms in the structure having different diameters (Wang et al, 2024).…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Tribological and Electrochemical Properties of Multiphase CoCuFeNiNb High Entropy Alloy

Sünbül,

İcin

2024

Ordu Üniversitesi Bilim Ve Teknoloji Dergisi

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Recent research has heavily focused on high entropy alloys (HEAs) due to their promising potential for diverse industrial applications. This study investigates the CoCuFeNiNb alloy, analyzing its structural, tribological, and electrochemical characteristics. The alloy was synthesized using vacuum arc melting in an argon environment and was subsequently examined through X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), wear testing, and corrosion analysis. The tribological and electrochemical performances were assessed through wear and corrosion experiments. The results reveal that the alloy contains FCC, BCC, and Laves phases. The coefficient of friction for the CoCuFeNiNb high entropy alloy increased to 0.28, 0.5, and 0.78 under loads of 0.25 MPa, 0.5 MPa, and 1 MPa, respectively. Observations of the wear surface showed abrasion wear at low pressure, delamination layers at medium pressure, and plastic deformation zones at high pressure. In a 3.5 wt% NaCl solution, the alloy exhibited a corrosion potential of -0.236 V and a corrosion current density of 1.89×10⁻⁵ A/cm².

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