Optimizing the electromagnetic properties of the FeCoNiAlCrx high entropy alloy powders by composition adjustment and annealing treatment

Duan, Yuping; Wen, Xin; Zhang, Bin; Ma, Guiping; Wang, Tongmin

doi:10.1016/j.jmmm.2019.165947

Cited by 49 publications

(28 citation statements)

References 37 publications

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“…shifting Tc for more than 170 K towards higher temperatures) and, increasing Ms by 61 % and 16 % for Al1.0 and Al1.5 additions, respectively. For instance, the high Ms = 100 Am 2 kg -1 shown by sample Al1.0 is similar or better than others systems considered of excellent magnetic properties, for example, AlNiCoFe [29], AlNiCo5 doped Sm(Co0.9Cu0.1)5 ribbons [30], FeCoNiAlCrx, x = 0.1, 0.3, 0.5, 0.7, and 0.9 [31], Fe38Co38Mo8B15Cu [32]. A high Tc, TC LTT (Al1.0) = 685 K, with high Ms and a low core losses as consequence of the low coercivity are attractive properties for industrial applications like sensors development, transducers and, transformers.…”

Section: Discussion and Analysissupporting

confidence: 53%

Study of dual-phase functionalisation of NiCoFeCr-Alx multicomponent alloys for the enhancement of magnetic properties and magneto-caloric effect

Quintana-Nedelcos

Leong

Morley

2021

Materials Today Energy

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Section: Discussion and Analysissupporting

confidence: 53%

Study of dual-phase functionalisation of NiCoFeCr-Alx multicomponent alloys for the enhancement of magnetic properties and magneto-caloric effect

Quintana-Nedelcos

Leong

Morley

2021

Materials Today Energy

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“…Considering that the resonance loss capacity of HE TMC-3 is mainly originated from the d-orbital splitting and the electron paramagnetic resonance, HE TMC-3 is expected to maintain high magnetic loss capacity at high temperatures [3,20]. Notably, decreasing the dielectric loss capacity and increasing the magnetic loss capacity in the meantime are helpful in optimizing the impedance match for dielectric loss-type EM wave absorbers with good conductivity, e.g., carbon nanotubes (CNTs) [11], TMCs [26], transition metal diborides (TMB 2 s) [48], highentropy alloys [49,50], etc. Therefore, it is promising to achieve good impedance match in HE TMC-3 with relatively close dielectric and magnetic loss capacities across a wide frequency band.…”

Section: Em Properties Of He Tmc Powdersmentioning

confidence: 99%

Achieving ultra-broadband electromagnetic wave absorption in high-entropy transition metal carbides (HE TMCs)

et al. 2022

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Electronic devices pervade everyday life, which has triggered severe electromagnetic (EM) wave pollution. To face this challenge, developing EM wave absorbers with ultra-broadband absorption capacity is critically required. Currently, nano-composite construction has been widely utilized to realize impedance match and broadband absorption. However, complex experimental procedures, limited thermal stability, and interior oxidation resistance are still unneglectable issues. Therefore, it is appealing to realize ultra-broadband EM wave absorption in single-phase materials with good stability. Aiming at this target, two high-entropy transition metal carbides (HE TMCs) including (Zr,Hf,Nb,Ta)C (HE TMC-2) and (Cr,Zr,Hf,Nb,Ta)C (HE TMC-3) are designed and synthesized, of which the microwave absorption performance is investigated in comparison with previously reported (Ti,Zr,Hf,Nb,Ta)C (HE TMC-1). Due to the synergistic effects of dielectric and magnetic losses, HE TMC-2 and HE TMC-3 exhibit better impedance match and wider effective absorption bandwidth (EAB). In specific, the exclusion of Ti element in HE TMC-2 endows it optimal minimum reflection loss (RLmin) and EAB of −41.7 dB (2.11 mm, 10.52 GHz) and 3.5 GHz (at 3.0 mm), respectively. Remarkably, the incorporation of Cr element in HE TMC-3 significantly improves the impedance match, thus realizing EAB of 10.5, 9.2, and 13.9 GHz at 2, 3, and 4 mm, respectively. The significance of this study lays on realizing ultra-broadband capacity in HE TMC-3 (Cr, Zr, Hf, Nb, Ta), demonstrating the effectiveness of high-entropy component design in tailoring the impedance match.

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“…Therefore, absorbing materials with high absorption and low reflection properties have been developed to eliminate EMI and provide information security. [1][2][3] Commonly, the EM loss mechanisms of absorbing materials are the dielectric loss of dipole polarization, [4][5][6][7] conductance loss of inducing electronic current, [8][9][10] magnetic loss of magnetic resistance, and resonance absorption. [11][12][13] Ideal absorbing materials are required to obtain comprehensive strong absorption, a wide absorption band, thin thickness, and light weight.…”

Section: Introductionmentioning

confidence: 99%

Lossy Frequency‐Selective Surface Metamaterials Based on Silicon Slice with Broadband Microwave Absorption at Elevated Temperature

Qiao

Liao

et al. 2022

Physica Rapid Research Ltrs

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A broadband metamaterial absorber (MA) with high‐temperature resistance is designed and fabricated using a regular octagonal ring‐cross structure as a frequency‐selective surface (FSS). A high‐temperature conductive paste and SiO2 are used as the FSS raw materials and middle layer, respectively. Simulation and experimental results show that the absorber reaches a reflection loss below −5 dB at the 5.17–18 GHz range with normal incidence at room temperature. The measured values are in good agreement with the simulation results. At 800 °C, the absorption bandwidth expands to 13.3 GHz (4.72–18 GHz). The equivalent impedance of the absorber is obtained using an inversion method to qualitatively explain its working mechanism. The electric energy density, magnetic energy density, and surface current at the resonance frequency provide an intuitive understanding of the power loss of the structure. Comprehensive analysis illustrates that the main absorption mechanisms of the high‐temperature broadband MA (HBMA) are ohmic and resonance losses.

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Optimizing the electromagnetic properties of the FeCoNiAlCrx high entropy alloy powders by composition adjustment and annealing treatment

Cited by 49 publications

References 37 publications

Study of dual-phase functionalisation of NiCoFeCr-Alx multicomponent alloys for the enhancement of magnetic properties and magneto-caloric effect

Study of dual-phase functionalisation of NiCoFeCr-Alx multicomponent alloys for the enhancement of magnetic properties and magneto-caloric effect

Achieving ultra-broadband electromagnetic wave absorption in high-entropy transition metal carbides (HE TMCs)

Lossy Frequency‐Selective Surface Metamaterials Based on Silicon Slice with Broadband Microwave Absorption at Elevated Temperature

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