Soft Magnetic Properties of High-Entropy Fe-Co-Ni-Cr-Al-Si Thin Films

Lin, Po‐Hung; Cheng, Chien-Hong; Chin, Tsung‐Shune

doi:10.3390/e18080308

Cited by 29 publications

(11 citation statements)

References 40 publications

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“…magnetron sputtering [34][35][36], laser cladding [37,38], spraying [39], electrodeposition [40], plasma-transferred arc cladding [41], and others. The present experimental results have proved that HEA films and coatings can show excellent mechanical and physical properties, such as the high hardness and elastic modulus [42,43], superior wear resistance [44], corrosion [45] and temperature resistance [46], as well as the appealing electrical [47] and magnetic properties [48].…”

Section: Introductionsupporting

confidence: 55%

“…Lin et al [48] fabricated the FeCoNiCrAlSi thin films and reported the excellent soft magnetic properties. The film had a simple BCC structure under as-deposited and post-annealing conditions at 400°C and below.…”

Section: Physical Characteristicsmentioning

confidence: 99%

“…The saturation magnetization (M s ), coercivity at the hard axis ( h H c ), and coercivity at the easy axis ( e H c ) of the Fe-Co-Ni-Cr-Al-Si thin film versus field-temperature[48].…”

mentioning

confidence: 99%

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Microstructures and properties of high-entropy alloy films and coatings: a review

Liu

Liaw

2018

Materials Research Letters

424

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In the past 14 years, as a branch of high-entropy alloy (HEA) materials, HEA films and coatings have exhibited the attractive and unique properties, relative to the conventional film and coating materials. The recent research and development of HEA films and coatings are reviewed in this paper. At first, the basic concept of HEAs films and coatings are introduced. Then, their preparation technologies, microstructures and appealing properties are summarized. Moreover, the possible reasons and design criteria for achieving the excellent properties are discussed. Finally, the suggested future research work for the HEA films and coatings are outlined. IMPACT STATEMENT Preparation technologies, microstructures, and properties of HEA films and coatings are reviewed in this paper. The design criteria and suggested research directions are further discussed and proposed.

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Section: Introductionsupporting

confidence: 55%

Section: Physical Characteristicsmentioning

confidence: 99%

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Microstructures and properties of high-entropy alloy films and coatings: a review

Liu

Liaw

2018

Materials Research Letters

424

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“…Wherein the hypereutectic CoCrFeNiNb 1.0 alloy coating with the highest hardness exhibited the best wear resistance under the same wear condition, the dry wear test showed the wear mass loss of CoCrFeNiNb 1.0 alloy coating was less than a third of the substrate. The high hardness and wear resistance properties were considered with the fine lamellar eutectic structure and proper combination of FCC and Laves phases.Crystals 2018, 8, 409 2 of 11 superconductivity [24,25], soft magnetism [26,27], etc. As a result, HEAs can be an attractive material for a range of applications.…”

mentioning

confidence: 99%

“…Crystals 2018, 8, 409 2 of 11 superconductivity [24,25], soft magnetism [26,27], etc. As a result, HEAs can be an attractive material for a range of applications.…”

mentioning

confidence: 99%

Microstructure and Mechanical Properties Investigation of the CoCrFeNiNbx High Entropy Alloy Coatings

Jiang

Cao

2018

Crystals

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In this work, the CoCrFeNiNb x (x: molar ratio, x = 0.45, 0.5, 0.75, and 1.0) high entropy alloy coatings were synthesized on a 304 stainless steel substrate by laser cladding to investigate the effect of Nb element on their microstructure, hardness, and wear resistance. The results indicated that in all of the CoCrFeNiNb x alloy coatings, two phases were found: One was a face-centered cubic (FCC) solid solution phase, the other was a Co 1.92 Nb 1.08 -type Laves phase. The microstructures of samples varied from hypoeutectic structure (x = 0.45 and 0.5) to hypereutectic structure (x = 0.75 and 1.0). The Vickers hardness of CoCrFeNiNb x alloy coatings was obviously improved compared with the substrate. The hardness value of the CoCrFeNiNb 1.0 alloy coating reached to 590 HV, which was 2.8 times higher than that of the substrate. There was also a corresponding variation in wear properties with hardness evolutions. Wherein the hypereutectic CoCrFeNiNb 1.0 alloy coating with the highest hardness exhibited the best wear resistance under the same wear condition, the dry wear test showed the wear mass loss of CoCrFeNiNb 1.0 alloy coating was less than a third of the substrate. The high hardness and wear resistance properties were considered with the fine lamellar eutectic structure and proper combination of FCC and Laves phases.Crystals 2018, 8, 409 2 of 11 superconductivity [24,25], soft magnetism [26,27], etc. As a result, HEAs can be an attractive material for a range of applications. However, the cost of HEAs is higher than that of conventional alloys because of the expensive high-purity raw materials. To reduce the cost, the HEA coatings obtained by laser cladding with advanced properties continue to be in great demand. At present, laser cladding as a surface coating method has been the subject of extensive research [28,29]. Advantages of laser cladding are the integrity of the fusion bond between the cladding coating and substrate, smaller thermal effects on the substrate, high process flexibility, high working speeds, and environmental protection. Moreover, the rapid solidification of laser cladding results in the finer microstructure and extended solid solution, in addition to the high-performance surface with enhanced properties. Stainless steels are widely used in industry and daily life due to their high corrosion, oxidation resistance, and workability. However, its low hardness and wear resistance are not ideal for practical applications. Therefore, the enhancement of hardness and wear resistance of the 304 stainless steels is quite necessary. Recently, there has been a growing interest in the fabrication of surface layers of HEAs on stainless steel [30][31][32]. The hardness and wear resistance of stainless steel can be improved by coating HEA on its surface. For example, FeCoCrAlNi HEA coating [33] prepared by laser cladding on 304 stainless steel possessed high hardness, which was~three times higher than that of the substrate. FeNiCoSiCrAlTi HEA coating [34] prepared by laser cladding on Q235 steel showed ...

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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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Soft Magnetic Properties of High-Entropy Fe-Co-Ni-Cr-Al-Si Thin Films

Cited by 29 publications

References 40 publications

Microstructures and properties of high-entropy alloy films and coatings: a review

Microstructures and properties of high-entropy alloy films and coatings: a review

Microstructure and Mechanical Properties Investigation of the CoCrFeNiNbx High Entropy Alloy Coatings

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

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