In situ study of non-equilibrium solidification of CoCrFeNi high-entropy alloy and CrFeNi and CoCrNi ternary suballoys

Andreoli, Angelo F.; Witusiewicz, V.T.; Wu, Yuhao; Yang, Yanzhao; Ivashko, Oleh; Dippel, Ann‐Christin; Zimmermann, M. v.; Nielsch, Kornelius; Kaban, I.

doi:10.1016/j.actamat.2021.116880

Cited by 48 publications

(4 citation statements)

References 67 publications

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“…This microstructure results from the instability of the solidification front and significant elemental partitioning, which give rise to the dendritic and interdendritic regions. [ 42,43 ] Based on previous research concerning the mentioned microstructure, it has been revealed that the dendrites are enriched in Fe, whereas the interdendritic regions are enriched in Mn and Co. Additionally, other elements show a uniform distribution. Therefore, the distinctions between the dendritic and interdendritic areas are solely related to the local variation of the chemical composition.…”

Section: Resultsmentioning

confidence: 99%

Revealing the Effects of Friction Stir Processing on the Microstructural Evolutions and Mechanical Properties of As‐Cast Interstitial FeMnCoCrN High‐Entropy Alloy

Abbasi,

Zarei‐Hanzaki,

Charkhchian

et al. 2024

Adv Eng Mater

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The present study aims to investigate the effect of friction stir processing (FSP) on the microstructural evolutions and mechanical properties of a nonequiatomic interstitial high‐entropy alloy (HEA). To achieve this, an as‐cast FeMnCoCrN interstitial HEA undergoes FSP to modify the as‐cast microstructure and investigate the resulting effects on mechanical properties. The grain size, sub‐boundaries, martensite fraction, and accommodated strain exhibit a gradient from the base metal (BM) to the stir zone (SZ). As a result of FSP, the average grain size in the upper SZ is significantly decreased from ≈700 μm in BM to 1.5 μm, which is around 500 times finer than that of the BM. Furthermore, the martensitic transformation in a single metastable face‐centered‐cubic phase specifically occurs in the thermomechanical‐affected and heat‐affected zones. Continuous and geometric dynamic recrystallizations triggered by FSP lead to the development of a refined equiaxed microstructure. This gradient microstructure, in turn, plays a pivotal role in achieving significantly improved mechanical properties when compared to the as‐cast microstructure. Remarkably, the yield strength doubles, the ultimate tensile strength increases from 548 to 852 MPa, and ductility increases by 16%.

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Section: Resultsmentioning

confidence: 99%

Revealing the Effects of Friction Stir Processing on the Microstructural Evolutions and Mechanical Properties of As‐Cast Interstitial FeMnCoCrN High‐Entropy Alloy

Abbasi,

Zarei‐Hanzaki,

Charkhchian

et al. 2024

Adv Eng Mater

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“…Table 3 It is known that the growth velocity of bcc crystals is in general smaller than that of fcc crystals. For example it has been shown in a recent study of Andreoli et al [17] that v bcc is about 3 -4 times smaller than v fcc in the CoCrFeNi HEA at ∼80 K undercooling, relative to the liquidus temperature of the respective phase. However, the growth velocity of the bcc phase in the undercooled CoCrFeNi melt is about two orders of magnitude larger than in the NbTiVZr melt.…”

Section: Crystal Growth Kineticsmentioning

confidence: 93%

Phase Constitution and Microstructure of the NbTiVZr Refractory High-Entropy Alloy Solidified Upon Different Processing

et al. 2021

Self Cite

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“…The BCC phase would form when there is a large ΔT in the CoCrFeNi alloy, as corroborated by An et al via thermo-dynamic calculations. [47] In addition, several researchers also found that the FCC and BCC dual-phased structure of the CoCrFeNi alloy is closely related to the large ΔT, [48][49][50] with severe lattice distortion. [48] These previously reported findings demonstrate that an FCC and BCC dual-phased structure can be obtained in the CoCrFeNi film during the magnetron sputtering.…”

Section: Microstructural Characterizationmentioning

confidence: 99%

Native Oxidation and Complex Magnetic Anisotropy‐Dominated Soft Magnetic CoCrFeNi‐Based High‐Entropy Alloy Thin Films

Zhang

Wang

et al. 2022

Advanced Science

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Soft magnetic high-entropy alloy thin films (HEATFs) exhibit remarkable freedom of material-structure design and physical-property tailoring, as well as, high cut-off frequencies and outstanding electrical resistivities, making them potential candidates for high-frequency magnetic devices. In this study, a CoCrFeNi film with excellent soft magnetic properties is developed by forming a novel core-shell structure via native oxidation, with ferromagnetic elements Fe, Co, and Ni as the core and the Cr oxide as the shell layer. The core-shell structure enables a high saturation magnetization, enhances the electrical resistivity, and thus reduces the eddy-current loss. For further optimizing the soft magnetic properties, O is deliberately introduced into the HEATFs, and the O-incorporated HEATFs exhibit an electrical resistivity of 237 μ𝛀•cm, a saturation magnetization of 535 emu cm −3 , and a coercivity of 23 A m −1 . The factors that determine the ferromagnetism and coercivity of the CoCrFeNi-based HEATFs are examined in detail by evaluating the microstructures, magnetic domains, chemical valency, and 3D microscopic compositional distributions of the prepared films. These results are anticipated to provide insights into the magnetic behaviors of soft magnetic HEATFs, as well as aid in the construction of a promising material-design strategy for these unique materials.

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In situ study of non-equilibrium solidification of CoCrFeNi high-entropy alloy and CrFeNi and CoCrNi ternary suballoys

Cited by 48 publications

References 67 publications

Revealing the Effects of Friction Stir Processing on the Microstructural Evolutions and Mechanical Properties of As‐Cast Interstitial FeMnCoCrN High‐Entropy Alloy

Revealing the Effects of Friction Stir Processing on the Microstructural Evolutions and Mechanical Properties of As‐Cast Interstitial FeMnCoCrN High‐Entropy Alloy

Phase Constitution and Microstructure of the NbTiVZr Refractory High-Entropy Alloy Solidified Upon Different Processing

Native Oxidation and Complex Magnetic Anisotropy‐Dominated Soft Magnetic CoCrFeNi‐Based High‐Entropy Alloy Thin Films

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