Zhong Li

• Doctor of Engineering
• Research Assistant at Hangzhou Dianzi University

This Special Issue on "Recent Advances in High Entropy Alloys" aims to explore cutting-edge developments in the field of materials science, focusing on the unique properties and applications of high-entropy alloys (HEAs). These alloys, characterized by their equiatomic or near-equiatomic mixture of four or more elements, have garnered significant a...

Soft magnetic composites (SMCs) are key materials in electronic devices. Conventional SMCs incorporate too much insulating material in order to reduce eddy current loss at high frequency, resulting in severe magnetic dilution and demagnetization field, which leads to deterioration of the magnetic performance. In this paper, ZnO precursor is homogen...

The phase evolution, magnetic properties and microstructure of rod-shaped permanent magnets prepared by annealing the amorphous precursor Fe70−xNd7B21Zr2Nbx (x = 0–3.0) were systematically studied. X-ray diffraction analysis, magnetometer, microstructure and δM-plots studies show that the good magnetic properties of the magnet are attributed to the...

Soft magnetic materials with stable permeability up to hundreds of megahertz (MHz) are urgently needed for integrated transformers and inductors, which are crucial in the more-than-Moore era. However, traditional frequency-stable soft magnetic ferrites suffer from low saturation magnetization and temperature instability, making them unsuitable for...

This review summarizes the methods to construct the efficient M-N3 sites-enriched porous structure with enhancement of the electrochemical accessibility. Compared with intact M-N4, the low-coordination M-N3 with defect-regulated geometry and...

Soft magnetic composites (SMCs) are ungently demanded in high‐frequency power electronics for their large magnetization and high electrical resistivity. However, traditional cold‐pressed SMCs are faced with low mechanical strength and insulation instability, which severely restricts their applications. In this study, liquid‐phase sintering techniqu...

Traditional strengthening of alloys involves dislocation, second phase and grain boundary, which could deteriorate plasticity and coercivity (Hc). In this work, multiple coherent interfaces are introduced in Fe26Co25Ni20Cu15Al13.1Ga0.9 (denoted HEA2) soft magnetic high-entropy alloy, by which tradeoff among strength, plasticity and coercivity has b...

How to obtain excellent electromagnetic absorption properties in microscale powder is still a great challenge. Dielectric loss capacity originating from low electric resistance of metal alloy and Snoek's limit in the microscale powder seriously restrict the application of microscale materials in GHz range. In this work, for optimizing electromagnet...

In this work, the AC magnetic properties and microstructure of FeCoNi1+xCu1-xAl (0 ≤ x ≤ 1.0) high-entropy alloys (HEAs) are studied. The results show that the total loss (Ps), AC coercivity (AC Hc), and AC applied field (AC Hm) are improved by adjusting the amounts of Ni and Cu. When x = 0.1, Ps, AC Hc, and AC Hm of the alloy at 50 Hz decrease by...

High entropy alloys (HEAs), a new type of functional material, are rarely applied to prepare core-shell structured nanocomposites. In this work, [email protected] nanocapsules have been prepared by arc discharging HEAs ingot under the atmosphere of methane, displaying the sphere shape with the average diameter of 72.1 nm and ~ 3 nm onion-like carbo...

In this work, core/shell structured FeSiAl/MoO3 (spherical FeSiAl covered by ultra-thin MoO3 composite insulating layer) soft magnetic composites (SMCs) have been fabricated by a two-step heat treatment process. The influences of ammonium molybdate (AHM) content, first-step annealing temperature and second-step annealing temperature on magnetic, me...

Excellent soft magnetic performance, superior mechanical strength and good corrosion resistance ensures that soft magnetic composites can be applied in practice for a long time. It is difficult for single organic coating or inorganic coating to meet the multifunctional requirements of a high-performance magnetic core. In this work, inorganic-organi...

In order to optimize the porous, fragile and high-temperature decomposition of phosphate and strengthen the molding ability of gas-atomized FeSiAl powder, triple insulating layers including phosphoric acid, sodium silicate and silicone resin have been fabricated in this work. Phosphoric acid can form a phosphate insulating layer on the surface of F...

The FeCoNiCuAl high-entropy alloy (HEA) has good magnetic and mechanical properties which can be finely tuned by the fraction, composition, and distribution of the BCC and FCC phases. In this paper, we report the magnetic properties, corrosion resistance, and microstructure of the FeCoNiCuAlCex (0 ≤ x ≤ 0.09) HEAs. The results show that Ce addition...

Many factors can affect microwave absorption performance, including impedance matching, attenuation constant, electromagnetic (EM) loss capacity, multi-reflection and scattering and so on. In this work, corncob-derived carbon/Ni composites have been chosen to judge which factor has the greatest influence on the EM absorption behaviors, in which the...

High-entropy alloys (HEAs) are a new class of alloys that consist of at least five major elements in equimolar or near-equimolar ratios with atomic concentration between 5% and 35%. Many HEAs containing the ferromagnetic elements Fe, Co and Ni show soft magnetic properties, while few HEAs present hard magnetic properties. In this paper, we design a...

Non-precious oxygen evolution electrocatalysts have been attracting considerable attention because of their promising potentials in improving the efficiency of water splitting. Among all the candidates, FeNi electrocatalysts show the relatively high electrocatalytic performances, however, it still remains lack for the optimization of their structur...

Dielectric- and magnetic-loss capabilities are directly related to the composition, micro-structure, and macro-scale structure of materials. However, despite progress in understanding loss capabilities, the investigation of designing electromagnetic-wave-absorbing materials with multiscale approaches is less developed. In the present contribution,...

The impact of grain and phase boundaries on the magnetic domain structure and soft magnetic properties of the FeCoNi(AlSi)x (0.1 ≤ x ≤ 0.7) high-entropy alloys (HEAs) have been studied in this work. The x=0.1 alloy with single FCC phase and the x=0.5 alloy with single BCC phase show obvious grain and phase boundaries, while the x=0.3 containing FCC...

The present work investigated the effects of magnetic field annealing on the magnetic properties, mechanical properties and microstructure of the Fe80Si9B11 amorphous alloys. The results show that the soft magnetic properties (SMPs) were obviously improved after the samples were annealed below the crystallization temperature with a 1 T magnetic fie...

High-entropy alloys (HEAs) with soft magnetic properties are one of the new candidate soft magnetic materials which are usually used under an alternating current (AC) magnetic field. In this work, the AC soft magnetic properties are investigated for FeCoNixCuAl (1.0 ≤ x ≤ 1.75) HEAs. The X-ray diffraction (XRD) and scanning electron microscope (SEM...

Fe69.5−xNd7B21Nb2.5Zrx (x = 0–3) permanent magnets were produced by annealing bulk amorphous alloys. The intrinsic coercivity (Hcj) as well as maximum energy product ((BH)max) were enhanced significantly by Zr substitution in the Fe69.5−xNd7B21Nb2.5Zrx (x = 0–3) alloys, while the remanence (Br) is reduced slightly. When x = 2, annealed magnets tend...

The isothermal oxidation behavior and oxide-scale evolution on a newly developed Ni–Fe-based superalloy were investigated. Three oxidation stages were generally observed, an initial stage of rapid mass gain, then a second stage of parabolic kinetics, followed by an equilibrium period after about 50, 75, and 100 h at 1000, 1100, and 1200 °C, respect...

The Fe69.5–xNd7B21Nb2.5Gax (x = 0–1) permanent magnets in the form of rods were prepared by annealing the bulk amorphous alloys. The magnetic properties, phase evolution and microstructure of the alloys were investigated systematically. It is found that the glass forming ability (GFA), microstructure and magnetic properties are sensitive to Ga cont...

In this work, we investigate the evolution with x of the microstructure and alternating current (AC) magnetic properties of FeCoNi(MnSi) x (0 ≤ x ≤ 0.4) high-entropy alloys (HEAs) with the motivation of exploring the potential applications of soft magnetic HEAs. The suitable addition of MnSi improves AC remanence (AC B r ), AC coercivity (AC H c )...

Optimizing of alloy composition and heat-treatment for rapidly solidified Ce–Fe–B magnets can lead nanocrystalline products with enhanced magnetic properties. In this work, the magnetic properties and domain structures of the nanocrystalline Ce17Fe76.5Co1Zr0.5B6 have been investigated. The results show that hard Ce2Fe14B magnetic phase and paramagn...

The microstructure and room temperature magnetic properties for (Nd0.8Ce0.2)1.6Fe12Co2BZrx (x = 0-5) nanocomposite alloys prepared by melt-spinning method and subsequent thermal annealing have been investigated. Zr addition has proved to result in relevant improvements in the microstructure and magnetic properties. The enhanced coercivity Hcj of 6....

The present work exhibits the effects of Sn addition on the magnetic properties and microstructure of FeCoNi(CuAl)0.8Snx (0 ≤ x ≤ 0.10) high-entropy alloys (HEAs). The results show all the samples consist of a mixed structure of face-centered-cubic (FCC) phase and body-centered-cubic (BCC) phase. The addition of Sn promotes the formation of BCC pha...

In the present work, the (Nd0.8Ce0.2)2Fe12Co2−xTixB (x = 0–0.6) permanent alloys are prepared by melt-spinning method. Ti addition has proved to result in relevant improvements in the microstructure and magnetic properties. The enhanced coercivity Hcj of 7.13 kOe and maximum energy product (BH)max of 16.24 MGOe with a slight decrease in Br only hav...

In this study, the Fe69.5Nd7B21Nb2.5 permanent magnets in the form of rods were prepared by annealing the bulk amorphous precursors. The effect of magnetic field heat treatment on the magnetic properties and microstructure of the alloys was investigated. It was found that the as-cast Fe69.5Nd7B21Nb2.5 alloy showed soft magnetic properties, which be...

Co–Ni–W–P catalysts were synthesised onto γ-Al2O3 by electroless deposition. The obtained Co–Ni–W–P/γ-Al2O3 were characterised by field emission scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), inductively coupled plasma atomic emission spectrometry (ICP-AES) and X-ray photoelectron spectrosco...

The catalytic properties of CuCoP/γ-Al2O3 in hydrogen production via sodium borohydride hydrolysis were investigated on aspects of the surface morphology, structure and chemical composition. The characterization methods employed are X-ray diffraction (XRD), scanning electron microscope (SEM), inductively coupled plasma-atomic emission spectrometer...

Co–Ni–Mo–P catalysts were synthesized on the γ-Al2O3 by electroless deposition. The as-prepared Co–Ni–Mo–P/γ-Al2O3 catalysts were characterized by inductively coupled plasma atomic emission spectrometer (ICP-AES), field emission scanning electron microscope (SEM), energy dispersive X-ray spectrometer (EDS), X-ray diffraction (XRD), X-ray photoelect...

Co–W–P alloy catalysts were prepared on γ-Al2O3 supports by electroless deposition. Inductively coupled plasma atomic emission spectrometer(ICP-AES), field emission scanning electron microscope(SEM), energy dispersive X-ray spectrometer(EDS), X-ray diffraction(XRD), X-ray photoelectron spectroscopy(XPS) and nitrogen adsorption-desorption isotherm w...

The Ni-Co-P catalysts supported on carbon nanofibers (CNFs) were prepared via electroless deposition; the mass fractions of nickel, cobalt and phosphorus in Ni-Co-P layer are 13.30%, 82.25% and 4.45%, respectively, as determined by ICP-AES. The effects of catalyst amount, sodium borohydride and sodium hydroxide concentrations and reaction temperatu...

The supported amorphous alloy catalysts Ni–Co–P/γ-Al2O3 were synthesized by electroless plating for hydrogen generation from catalytic hydrolysis of sodium borohydride solution. The influences of deposition time, pH, NaBH4 concentration and the Co/Ni atomic ratio on the hydrogen generation rate were investigated in this paper. The reported work als...