Abstract The soft-magnetic high-entropy alloy (HEA) with the composition (FeCoNi) 92 Zr 5 Al 3 , (FeCoNi) 90 Zr 5 Al 5 and (FeCoNi) 88 Zr 5 Al 7 was fabricated using arc melting. The microstructure and crystal structure of the samples were characterized using scanning electron microscopy (SEM) and X-ray diffraction (XRD), respectively. The tensile yield strengths of the samples are 160 MPa, 282 MPa and 384 MPa, respectively. The three samples exhibit saturation magnetizations ( M s ) of 118 emu/g, 110 emu/g, and 105 emu/g. The coercivity ( H c ) is 9.9 Oe, 13.2 Oe and 14.5 Oe, respectively. This study provides an effective strategy for regulating the magnetic and mechanical properties of FeCoNi-based high-entropy alloys.

The phase relationships along the Sm2Co17-Y2Co17 section of the ternary Sm-Y-Co system have been studied by X-ray powder diffraction, scanning electron microscopy, differential thermal analysis and thermogravimetric analysis. The results show that (Sm1-xYx)2Co17 (x = 0.0-1.0) alloys form continuous solid solutions with rhombohedral structure (space group R-3 m). The lattice parameters a, c and cell volumes V of (Sm1-xYx)2Co17 solid solutions decrease linearly with the increase of Y. And the congruent melting temperature of (Sm1-xYx)2Co17 alloys increases gradually when Y content increases, while the Curie temperature decreases linearly. The allotropic transformation reaction beta-(Sm, Y)2Co17 -><-alpha-(Sm, Y)2Co17 has been confirmed, although its transition temperature was unclear. Combined with the test data, the tentative vertical section phase diagram of Sm2Co17-Y2Co17 in the ternary Sm-Y-Co system has been constructed.

Driven by rare-earth supply risks and cost pressure, the L10-τ (MnAl) phase is an attractive rare-earth-free permanent-magnet candidate. However, τ-MnAl is metastable and readily decomposes during annealing, while transformation-related defects further limit coercivity. In this work, Mn54Al46Gdx ingot alloys (x = 0.00–0.70) were fabricated by arc melting followed by a two-step heat treatment. The effect of minor Gd additions on the ε → τ transformation, τ-phase stability, and magnetic performance was investigated. An orthogonal design (wheel speed/annealing temperature/holding time) was employed to establish the heat-treatment processing window. The ingots exhibited a non-monotonic dependence on Gd content, with the optimum at x = 0.20 [M(2T) = 95.14 A·m2/kg, Hc = 43.8 kA/m]. This enhancement was associated with microstructural refinement and the appearance of bright secondary particles near grain boundaries. Meanwhile, Gd addition promoted τ-phase formation under non-equilibrium solidification and suppressed the precipitation of competing phases. For melt-spun ribbons, Gd further promoted direct τ-phase formation during rapid quenching; after annealing at 500 °C for 10 min, the coercivity of the ribbon sample spun at 25 m/s reached 160.7 kA/m. Orthogonal analysis identified annealing temperature as the dominant parameter governing τ-phase evolution and magnetic properties, followed by wheel speed, while holding time has a comparatively minor effect. These results provide practical guidance for the synergistic optimization of microalloying and the design of the processing window to improve the performance in Mn-Al-based permanent magnets.

This study presents a systematic investigation of the phase stability, crystal structure and magnetic properties of Gd-doped Nd6-xGdxFe13Pd compounds with x = 0, 0.3, 0.6, 0.9, and 1.2. Rietveld refinements show that these compounds retain a single crystalline phase in the tetragonal Nd6Fe13Si-type structure with space group I4/mcm except for x = 1.2. Backscattered Electron/Energy Dispersive X-ray Spectroscopy characterization of the Nd6-xGdxFe13Pd (x = 0, 0.3, 0.6, 0.9,1.2) series reveal that minor Gd substitution for Nd preserves the single-phase 6:13:1 structure, whereas excessive Gd addition destabilizes this phase. The solubility limit of Gd in the Nd6Fe13Pd compound is thus established to be 4.7 at%. Magnetization versus Temperature curves reveal that distinct ferromagnetic to antiferromagnetic transition temperatures of Nd6-xGdxFe13Pd (x = 0, 0.3, 0.6, 0.9,1.2) at 200 Oe are 173 K, 202 K, 239 K, 277 K, and 278 K, respectively, indicating that Gd doping within the maximum solid solubility can effectively elevate the transition temperature of Nd6Fe13Pd. Isothermal magnetization curve tests on the Nd6-xGdxFe13Pd (x = 0.3, 0.9) samples show a field-induced metamagnetic transition from antiferromagnetic to ferromagnetic when the applied magnetic field exceeds the critical field. For a field change of 0-5T, the maximum magnetic entropy values were determined to be 3.12 J kg−1 K−1 at 210 K for Nd5.7Gd0.3Fe13Pd and 2.20 J kg−1 K−1 at 280 K for Nd5.1Gd0.9Fe13Pd. The temperature-averaged entropy change values of Nd5.7Gd0.3Fe13Pd and Nd5.1Gd0.9Fe13Pd reach 2.58 J kg−1 K−1 and 2.06 J kg−1 K−1 when ΔTH-C = 30 K. In addition, the calculated refrigeration capacity values of the samples with x = 0.3 and x = 0.9 are 128.6 J kg−1 and 160.3 J kg−1, respectively. The maximum normalized refrigeration capacity values are 45.27 J kg−1T−1 and 34.51 J kg−1T−1. These characteristics, especially the working temperature range covering room temperature, indicate that Gd-doped Nd6Fe13Pd compounds can serve as promising candidate materials for room-temperature magnetic refrigeration.

Enhancing the utilization of abundant rare earth elements to produce Nd-Fe-B based magnets with superior permanent magnetic properties remains a significant research focus in the field of rare earth permanent magnets. In this study, we propose an effective approach to significantly improve the coercivity of Nd,Ce-Fe-B-Ga ribbons. Ribbons with nominal compositions of [(1–x)(Nd0.5Ce0.5)11.76Fe82.35B5.88 + xNd30Fe65Ga5] (at%; x = 0, 0.1, 0.2, and 0.3) were fabricated via melt-spinning. Hysteresis loops at ±2 T reveal obvious exchange bias phenomena in all samples except for x = 0, which originates from the exchange coupling effect between the ferromagnetic (FM) phase and the antiferromagnetic (AFM) phase. Under an applied field of ±5 T, the coercivity increases progressively from 6.55 kOe (x = 0) to 18.98 kOe (x = 0.3). Specifically, the sample of x =0.1, where Ce accounts for 38.96 at% of the total rare earth content, achieves a coercivity of 14.46 kOe. The absolute values of the temperature coefficients of remanence (α) and coercivity (β) decrease from 0.420%/K (x = 0) to 0.334%/K (x = 0.2) and from 0.708%/K (x = 0) to 0.439%/K (x = 0.2), respectively. The transmission electron microscopy (TEM) characterization shows that in the Ga-free ribbons (x = 0), grains of the main phase RE2Fe14B are continuously surrounded by a thin RE-rich grain boundary (GB) phase. With Ga addition (x = 0.3), the continuous RE-rich GB phase disappears and large-sized triple junction phases form, which are composed of the RE-rich phase and the RE6Fe13Ga phase. Henkel plots further confirm the strong intergranular exchange coupling effect. Therefore, we propose a coercivity enhancement mechanism, namely, the reversal of magnetic domains is pinned through the exchange coupling effect between the AFM phase and the FM phase, thereby enhancing the coercivity of the magnet.

Thermal insulation materials have been widely used in many fields such as construction and home furnishings to promote energy conservation and sustainable energy development. However, traditional thermal insulation materials with excellent energy saving characteristics are mostly flammable polymers, enduring the risk of fire accidents. Thermal energy storage technique using phase change materials (PCMs) is a promising approach to reducing energy consumption and improving thermal insulation performance of building materials. In this study, we proposed to construct novel composite aerogels with an interconnected hierarchical porous structure and excellent thermal insulation by using assembly of polyimide (PI), bacterial cellulose (BC) and SiO2. Rigid PI molecules were cross-linked with the soft segments of BC to form stable and robust three-dimensional (3D) framework with high mechanical strength, and SiO2 nanoparticles dispersed on the framework of PI/BC to provide nanopores, extend heat conduction paths and increase heat radiation loss, which could effectively suppress thermal convection within hierarchical pores. Therefore, the PI/BC/SiO2 composite aerogels possessed outstanding thermal insulation and fire protection properties. Furthermore, the composite aerogels were used for package of n-octadecane PCMs, which can improve thermal insulation, flame retardant and temperature regulation of the obtained composite PCMs due to their high thermal energy storage capacity. Therefore, the novel composite PCMs show a great potential for applications in green and energy-saving constructions.

Atomic transition metal-nitrogen (M-Nx) active sites dispersed on carbon matrix have emerged as highly promising electrocatalysts for energy conversion systems, owing to their maximized metal center utilization and excellent conductivity of the carbon substrate. However, conventional symmetric M-N4 configurations often exhibit limited hydrogen evolution reaction (HER) activity in alkaline due to the inferior water dissociation capacity. In this work, isolated Co single atoms anchored on N-doped hollow carbon substrates (CoSA/NHCs) are successfully fabricated by the pyrolysis of Co2+-containing polypyrrole (Co-PPY) precursor, and the subsequent removal of embedded Co particles. Thanks to the high density of atomically distributed asymmetric Co-N4 moieties, which facilitate efficient water activation andoptimal adsorption of the active hydrogen (H*), the synthesized CoSA/NHCs electrocatalysts show remarkable HER activity and stability in alkaline electrolyte. Besides, they can effectively electrolyze HER in acidic medium, undergoing the Volmer-Heyrovsky pathway. Remarkably, CoSA/NHC-800, pyrolyzed at 800 °C, requires small overpotentials of 230 and 228 mV to achieve the current density of -10 mA cm-2 in 1.0 M KOH and 0.5 M H2SO4 solutions, respectively. Moreover, it displays small Tafel slopes, high Faradic efficiencies (∼100 %) and superior long-term stability. This study paves a strategic approach for designing high-performance single-atom electrocatalysts through asymmetric structural engineering.

Thermal insulation and temperature control are extremely important in numerous human activities. Traditional aerogels with low thermal conductivity are known to facilitate good insulation. Boron nitride (BN) aerogels consist of nanoscale nanofiber units with plentiful porous structures, possessing excellent thermal/electrical insulation and chemical stability. However, these porous materials cannot effectively block heat transmission, despite their low thermal conductivity. Therefore, it is necessary to develop a new insulation strategy and explore materials with excellent thermal insulation performance, with special attention to heat transmitted not only through air, but also through thermal regulation by thermal adsorption. Phase change materials (PCMs) are considered promising latent heat storage materials due to their large heat storage capacity, making them promising candidates for highly efficient thermal insulation. However, the flammability of organic PCMs and their susceptibility to leakage during the solid-to-liquid transition seriously limit their wide application. In this study we combined the dual-thermal insulation performance of BN fiber aerogels and PCMs and constructed novel flexible and multifunctional composites with excellent thermal insulation performance using Co-MOF nano-flower cross-linked BN aerogels as interconnected porous substrates to encapsulate paraffin wax (PW) PCMs. The composites exhibited the advantages of BN, Co-MOFs and PCMs, overcoming the drawbacks of single-component materials. The results showed that the latent-heat storage capacity of the BN/Co-MOF/PW composites reached 188.11 J g-1 and the resulting thermal conductivity was as low as 0.0397 W (m-1 K-1), due to high thermal insulation performance. The morphology, flexibility, mechanical performance, and flame retardancy of the constructed BN/Co-MOF/PW composites were systematically investigated, ensuring that the composites could be used for thermal insulation and flame-retardant applications.

This study presents a comprehensive investigation of the structural, magnetic, and magnetocaloric properties in Au-doped Nd6Fe13Pd1-xAux (x = 0.1-1.0). Structural analysis confirms that these samples crystallize in a singlephase tetragonal Nd6Fe13Si-type structure with space group I4/mcm. Magnetic measurements reveal distinct ferromagnetic(FM) to antiferromagnetic(AFM) transition temperatures at 142 K, 114 K, 85 K, and 63 K for compositions with x = 0.1, 0.2, 0.3, and 0.4, respectively. While for x > 0.5, the compounds are found to exist only in the AFM ordered state. A table-like magnetocaloric effect (MCE) accompanied by substantial refrigerant capacity (RC) was observed. Meanwhile, the higher Au-content sample exhibited remanencThis study presents a comprehensive investigation of the structural, magnetic, and magnetocaloric properties in Au-doped Nd6Fe13Pd1-xAux (x = 0.1-1.0). Structural analysis confirms that these samples crystallize in a single-phase tetragonal Nd6Fe13Si-type structure with space group I4/mcm. Magnetic measurements reveal distinct ferromagnetic(FM) to antiferromagnetic(AFM) transition temperatures at 142 K, 114 K, 85 K, and 63 K for compositions with x = 0.1, 0.2, 0.3, and 0.4, respectively. While for x > 0.5, the compounds are found to exist only in the AFM ordered state. A table-like magnetocaloric effect (MCE) accompanied by substantial refrigerant capacity (RC) was observed. Meanwhile, the higher Au-content sample exhibited remanence and coercivity, likely attributable to the exchange coupling between the ferromagnetic and antiferromagnetic sublattices. Under a magnetic field change from 0-5 T, the maximum magnetic entropy changes (-Delta S-M(max)) reach 4.54 J kg(-1) K-1, 4.11 J kg(-1) K-1, 3.90 J kg(-1) K-1 and 3.40 J kg(-1) K-1 for the respective compositions. When Delta TH-C is 20 K, the temperature-averaged entropy change (TEC) value of Nd6Fe13Pd0.9Au0.1 is 4.45 J kg(-1) K-1, which can reach 98 % of the value of 4.54 J kg(-1) K-1, revealing a table-like MCE. The corresponding RC values are calculated to be 309.6 J kg(-1), 323.2 J kg(-1), 317.2 J kg(-1), and 293.3 J kg(-1), respectively, and the normalized refrigerant capacity (NRC) values remain largely within the range of 55 to 65 J kg(-1). These characteristics demonstrate the significant potential of Nd6Fe13Pd1-xAux compounds as a promising candidate for middle-temperature magnetic refrigeration applications.e and coercivity, likely attributable to the exchange coupling between the ferromagnetic and antiferromagnetic sublattices. Under a magnetic field change from 0-5 T, the maximum magnetic entropy changes (- Delta Smax M ) reach 4.54 J kg-1 K-1, 4.11 J kg-1 K-1, 3.90 J kg-1 K-1 and 3.40 J kg-1 K-1 for the respective compositions. When Delta TH-C is 20 K, the temperature-averaged entropy change (TEC) value of Nd6Fe13Pd0.9Au0.1 is 4.45 J kg-1 K-1, which can reach 98 % of the Delta S-M(max) value of 4.54 J kg-1 K-1, revealing a table-like MCE. The corresponding RC values are calculated to be 309.6 J kg-1, 323.2 J kg-1, 317.2 J kg-1, and 293.3 J kg-1, respectively, and the normalized refrigerant capacity (NRC) values remain largely within the range of 55 to 65 J kg-1. These characteristics demonstrate the significant potential of Nd6Fe13Pd1-xAux compounds as a promising candidate for middle-temperature magnetic refrigeration applications.

Soft magnetic multi-principal element alloys (SMMPEAs) are emerging as promising materials for magnetic components in electrical applications and sustainable energy supply. However, achieving both excellent mechanical properties and soft magnetic properties remains a challenge for SMMPEAs. Here, the “metastability engineering” strategy is exploited in SMMPEAs to overcome the strength–ductility trade-off via the transformation-induced plasticity (TRIP). The designed alloy has a tensile strength of 1.65 GPa at 15% tensile elongation, saturation magnetization of 131 emu/g, coercivity of 12.5 Oe, and electrical resistivity of 116 μΩ cm. The results herein provide an effective paradigm for developing metastable SMMPEAs with TRIP for an enhanced strength–ductility synergy, paving the way for their application of high-performance magnetic components.

The microstructure, phase transition and magnetocaloric properties of RE2Co (RE = Tb, Dy, Er) prepared by melt-spinning technology were studied. XRD and DSC confirmed the formation of RE2Co (RE = Tb, Dy, Er) ribbons with amorphous nature. The DSC analysis results show that the first crystallization temperature of RE2Co (RE = Tb, Dy, Er) amorphous alloys are 565 K, 590 K, and 644 K, respectively, while their melting temperatures are 972 K, 998 K, and 1066 K, indicating excellent thermal stability of the ribbon alloys. The RE2Co (RE = Tb, Dy, Er) ribbons exhibit second-order ferromagnetic-paramagnetic transition at Curie temperatures of 92 K, 47 K, and 11 K, respectively. The RE2Co (RE = Tb, Dy, Er) ribbons exhibit paramagnetic behavior consistent with Curie-Weiss law in the paramagnetic region, with paramagnetic Curie temperatures of 98 K, 54 K, and 3 K, respectively, where positive theta p denotes the dominance of ferromagnetic contribution. For a magnetic field change of 0-5 T, the maximum magnetic entropy changes of RE2Co (RE = Tb, Dy,) are 8.9 J/kg K and 7.8 J/kg K, respectively, with the corresponding refrigerant capacity values of 446.1 J/kg and 361.5 J/kg, while the maximum magnetic entropy change for Er2Co is more than 27.1 J/kg K. The notable magnetocaloric effects indicate that the amorphous alloys RE2Co (RE = Tb, Dy, Er) present promising potential as viable candidates for magnetic refrigeration applications at lower temperatures.

The phase relationships of the NdmCon-SmmCon (m:n = 1:5 and 2:17) systems have been studied by means of X-ray powder diffraction (XRD), scanning electron microscopy equipped with energy dispersive X-ray spectroscopy (SEM-EDS), differential thermal analysis (DTA) and thermogravimetric measurements (TGM). The XRD results show that both (Nd1-xSmx)(2)Co-17 and (Nd1-xSmx)Co-5 form continuous solid solutions, with (Nd, Sm)(2)Co-17 solid solution belonging to rhombohedral structure (space group R-3m) and (Nd, Sm)Co-5 solid solution belonging to hexagonal structure (space group P6/mmm). The lattice parameters a, c, and the unit cell volume V of both (Nd1-xSmx)(2)Co-17 and (Nd1-xSmx)Co-5 gradually decrease with increasing Sm content x. The Curie temperatures of both (Nd1-xSmx)(2)Co-17 and (Nd1-xSmx)Co-5 increase gradually with the increase of Sm content x. Based on the XRD and DTA analysis results, the vertical section phase diagrams of the Nd2Co17-Sm2Co17 and NdCo5-SmCo5 systems have been constructed.

Realization of table-like magnetocaloric effect (MCE) is one of the important requirements to achieve high efficiency for magnetic refrigeration that uses the Ericsson cycle. In this work, optimal weight fraction x in (Ho5Pd2)x(Ho3Pd2)1-x to achieve table-like MCE was established by calculating method based on the Ho-Pd binary phase diagram and the MCEs of the individual Ho5Pd2 and Ho3Pd2 phases. Dual-phase composites (Ho5Pd2)x(Ho3Pd2)1-x (x=0.525, 0.55, 0.575, 0.6) were prepared by arc melting and annealing. All the (Ho5Pd2)x(Ho3Pd2)1-x alloys crystallize in the phases of Ho5Pd2 and Ho3Pd2, in which the table-like MCEs were obtained. Especially, a table-like MCE with a temperature span of 20 K is observed in the (Ho5Pd2)0.6(Ho3Pd2)0.4 composite for a field change of 0-5 T. The corresponding maximum magnetic entropy change (- Delta Smax refrigerant capacity (RC) and temperature-averaged entropy change (TEC) are determined to be 10.6 J/kg K, 428.7 J/kg and 10.5 J/kg K (Delta H=20 K), respectively. The value of RC is enhanced by 13 % compared with those in the single Ho5Pd2 (382.3 J/kg) and Ho3Pd2 (301.5 J/kg). The considerable RC and TEC values together with the table-like feature MCE suggest that the (Ho5Pd2)x(Ho3Pd2)1-x composite materials meet the requirements of low temperature magnetic refrigeration based on the Ericsson-cycle.

The magnetic properties of (Sm1-xPrₓ)Co₅ melt-spun ribbons with varying Pr content (x = 0–1.0) were investigated. Experimental results show that the best magnetic properties for SmCo₅ and PrCo₅ ribbons with a wheel speed of 40 m/s are achieved when annealed at 500 °C for 30 min. The melt-spinning process induces texture orientation, promoting the orderly alignment of grains. Both SmCo₅ and PrCo₅ exhibit a hexagonal P6/mmm crystal structure, allowing Pr to incorporate into the SmCo₅ primary phase and form a continuous solid solution (Sm, Pr)Co₅. As the Pr content increases, the Curie temperature (Tc) of (Sm1-xPrₓ)Co₅ ribbons decreases from 948 to 880 K. Coercivity (Hcj), remanence ratio (Mr/Ms), and maximum energy product [(BH)max] all decrease with increasing Pr content, while saturation magnetization (Ms) increases. This contradictory behavior indicates that the enhanced magnetization due to Pr substitution is offset by the reduced magnetic crystalline anisotropy in the (Sm1-xPrₓ)Co₅ ribbons. Overall, a relatively balanced magnetic performance can be obtained when the content of Pr substitution is less than 0.3.

Electrospinning carbon nanofibers with one-dimensional nanostructures have enormous potential for electronic applications owing to their flexibility, electrical conductivity, high surface area and attractive structure. In this paper, porous nitrogen-doped carbon nanofiber membranes with chemical crosslinking structure (PNCNMs-CC) were prepared for lithium-ion batteries anodes by crosslinking treatment and carbonization process using polyimide as precursor, melamine as nitrogen source and ethyl orthosilicate as pore-forming agent. The heightened nitrogen content synergizes with the augmented specific surface area, engendering a striking electrochemical enhancement. Rich pore structure provides more active sites. When utilized as a binder-free, current collector-free anode, PNCNMs-CC shows an excellent rate performance and long cycle stability. The first discharge specific capacity of PNCNMs-CC delivered 710 mAh g-1 at 50 mA g-1. After 1000 cycles at a high current density of 1 A g-1, PNCNMs-CC shows 88% capacity retention, demonstrating a promising candidate as the flexible anodes for high-performance energy storage devices.

The phase relations of the R2Fe14B-Ce2Fe14B (R = Nd, Pr) pseudobinary systems have been investigated by using X-ray powder diffraction, scanning electron microscopy equipped with energy dispersive X-ray spectroscopy and differential thermal analysis. The X-ray powder diffraction results show that continuous solid solutions were formed in this R2Fe14B-Ce2Fe14B (R = Nd, Pr) pseudobinary systems, and all (R-,R- Ce)(2)Fe14B solid solutions belong to the tetragonal structure with space group P4(2)/mnm. With the increase in Ce content, the lattice parameters a, c, the peritectic reaction temperatures of the (R, Ce)(2)Fe14B (R = Nd, Pr) solid solutions decrease linearly, and the cell volume V varies in the form of the regression line. Based on the X-ray powder diffraction results and differential thermal analysis data, the quasi-binary phase diagrams of the R2Fe14B-Ce2Fe14B (R = Nd, Pr) systems have been established.

Memristors are a promising option for achieving high-density storage and neuromorphic computing. However, the high-bias electroforming step and the sneak current arises in the crossbar array architecture impeded the further advancement of memristors. To overcome these obstacles, there is a need for in-depth research into the materials and fabrication processes of memristors. In this work, we have chosen the conventional titanium oxide as the functional layer and prepared the memristor with the structure of Pt/TiOx/Al by magnetron sputtering process. The conduction behavior of the Pt/TiOx/Al memristor is attributed to the Schottky emission. The device was an interface-type memristor with electroforming-free switching and self-rectifying effect. The conductance changes with different dynamic synaptic characteristics were demonstrated. The typical long-term potentiation (LTP) and long-term depression (LTD) were implemented by adjusting the pulse width, interval, or amplitude. The non-linearity can be adjusted by pulse parameters, and optimal non-linearity (0.167) were obtained by stepwise pulse stimulus. This study demonstrates that the Pt/TiOx/Al memristor has potential applications in high-density and efficient neuromorphic computing.

The microstructure, phase constitution and corrosion behavior of non-stoichiometric LaxFe11Co0.8Si1.2 (x=1.0, 1.2, 1.4, 1.6) magnetocaloric alloys were investigated. Annealed LaxFe11Co0.8Si1.2 compounds, containing the desired NaZn13-type matrix phase (1:13 phase), as well as a small α-Fe and La-rich phase content, exhibited high micro-galvanic corrosion in deionized water. The size of the La-rich phase in the LaxFe11Co0.8Si1.2 alloys varied with the La content. The refined La-rich phase in the La1.4Fe11Co0.8Si1.2 alloy led to reduced galvanic corrosion and a more protective corrosion layer. Due to the internal stress of the corrosion product, the corrosion product of the coarse La-rich phase in the La1.6Fe11Co0.8Si1.2 alloy easily cracked, leading to higher corrosion. Among these alloys, the La1.4Fe11Co0.8Si1.2 alloy with a high content of the 1:13 phase and a small finer La-rich phase content, exhibited strong corrosion resistance.

Adjusting the phase composition of high-entropy alloys is an effective approach to change its mechanical and magnetic properties. In this study, FeCoNiCr high-entropy alloys with Al addition (AlxFeCoNiCr; x = 0.0, 0.25, 0.5, 0.75, 1.0, 1.25, 1.75) were prepared by argon arc melting to obtain a special spinodal decomposition structure. There precipitated body-centered cubic (BCC) phase in the face-centered cubic (FCC) phase matrix for the samples with Al (x = 0.25, 0.5, 0.75) addition. Furthermore, the increase in the Al content (x = 1.0, 1.25, 1.75) transformed the alloy into a BCC phase, and resulted in a spinodal decomposition in the alloy. This spinodal decomposition created a low-misfit coherent nanostructure combining the enriching AlNiCo ordered B2 matrix with enriching Fe-Cr BCC disordered nanoprecipitates. The difference in the distribution of chemical elements of the two phases leads to different magnetic properties and induces the magnetoresistance (MR) effect. This provides a pathway for the design of advanced functional high-entropy alloys.