- Ei，ESCI收录期刊
- 中国科学引文数据库(CSCD)核心期刊
- 中文核心期刊
- 文摘与引文数据库(Scopus)
- 剑桥科学文摘(CSA)
Lightweight is the eternal theme in the aerospace field. TiAl alloy has a density of 3.9-4.2 g/cm3， which is 1/2 of nickel based superalloy. It has excellent properties of light mass and heat resistance and has important application value in the manufacture of hot-end components of aerospace equipment. However， TiAl alloy has inherent brittleness， low plasticity at room temperature and poor thermal deformation ability， which makes it difficult to process and form， high cost， and limits its large-scale application. Based on the review of the development and application status of TiAl alloy， the research progress of hot forming technology such as casting， powder metallurgy， thermoplastic forming， and additive manufacturing is reviewed. The thermoplastic forming technology， including canned-extrusion， isothermal forging， near-isothermal forging， and canned-rolling， is emphasized. The main problems of the existing plastic forming technology are poor plasticity， high forming difficulty， low forming efficiency， and insufficient performance. In the future， the development direction of plastic forming of TiAl alloy should be high efficiency and low cost near net forming， while improving the utilization rate and mechanical properties of the material.
The 6061 aluminum alloy billets are subjected to solution quenching treatment under a solution heat treatment condition of 550 ℃ for 30 min. After quenching， the billets are artificially aged at 140 ℃ for 6 h to 18 h to obtain pre-hardening （PH） billets. The formability and mechanical properties of the pre-hardening 6061 aluminum alloy billets are evaluated using room-temperature Erichsen cupping tests and uniaxial tensile tests. Additionally， the stamping trials for hat-shaped beam components are conducted to verify the feasibility of this technique for engineering applications. The results show that the yield strength （YS） of the PH-12 h pre-hardening billets is 186 MPa higher than that of the O-temper billets， and the tensile strength （TS） is 215 MPa higher than that of the O-temper billets， while the elongation （EL） and cupping values are comparable to those of the O-temper billets. The PH-18 h pre-hardening billets exhibit a maximum tensile strength of 391 MPa after 10% deformation， significantly exceeding that of the T6-temper aluminum alloy， demonstrating that the pre-hardening billets possess excellent strength-ductility balance. Furthermore， the hat-shaped beam components formed from pre-hardening billets exhibit tensile and yield strengths superior to those of the T6-temper aluminum alloy.
Single point incremental forming （SPIF） is a highly flexible manufacturing process widely utilized in the aerospace industry， particularly suited for customized and small-batch production components. However， the appropriate range of process parameters suitable for different models remains undefined， necessitating extensive parameter testing. An orthogonal experiment is conducted to perform a multi-factor analysis of variance， discussing the influence of parameters such as sheet thickness， angle， incremental amount， feed rate， and rotational speed on the maximum forming depth. Based on the experimental results， a regression model using the Adaboost algorithm is developed to predict the forming depth of 6061 aluminum alloy thin sheets at the forming diameter of 100 mm. The results indicate that the influences of single factors on the maximum forming depth in descending order of significance are： thickness， layer increment， angle， feed rate， and rotational speed. Under the optimal forming conditions achieved at the fastest forming speed， the maximum forming angle is 70°， the sheet thickness is 1 mm， the layer increment is 0.2 mm， the feed rate is 2000 mm/min， and the rotational speed is 2000 r/min. Furthermore， the regression model created based on the orthogonal experiment demonstrates high accuracy， correlating well with both the Abaqus simulation results and the actual experimental outcomes. The maximum error between the four groups of tests and simulations is 4.24%， while the maximum error with the actual forming results is -2.45%.
This paper proposes a non-isothermal solid solution-forging integrated hot forming process for 7075 aluminum alloy. After solid solution treatment， the aluminum alloy is directly placed into the mold for forging， then quenched and subjected to artificial aging treatment. The influence of water entry temperature and aging parameters on the microstructure and properties of 7075 aluminum alloy is studied under this process， through the construction of a temperature-time-property（TTP） curve. Additionally， machine learning techniques are integrated to optimize and match the key process parameters. The results reveal that the nose temperature of the TTP curve is 315 ℃， and the mechanical properties of the alloy increase with the increase of water temperature after aging， a double-peak phenomenon after non-isothermal forging and aging is observed. When the inlet temperature is 380 ℃， the optimal aging parameters are 115 ℃-26 h and the peak hardness is 182HV. After training， the prediction accuracy of the BP neural network model is 94.9977%. Experimental verification of the optimal process parameters predicted by the model shows that its prediction similarity is 96.9%. Compared with traditional forging processes， this process can achieve high mechanical properties than traditional forged T6-state 7075 aluminum alloy while reducing procedural steps and energy consumption.
A combination of numerical simulation and experimental methods was used to study the influence of Ni content on the hot tearing tendency of Al-5.6Zn-2.5Mg-1.6Cu-xNi （x=0%，0.1%，0.3%，0.5%，mass fraction， the same below） alloys. The hot tearing tendency of the alloy is systematically simulated using the ProCAST software， combining with optical microscopy （OM），scanning electron microscopy （SEM），X-ray diffraction （XRD）， room temperature tensile tests， precipitation phase， stress field， hot tearing index （HTI），and effective stress analysis methods. The hot tearing behavior and mechanical properties of the Al-Zn-Mg-Cu series alloys are systematically studied. The results show that when the Ni content is less than 0.5%， the HTI value first increases and then decreases with the increase of Ni content， and when the Ni content is 0.5%， the HTI value is the lowest. The effective stress at the bottom of the constraint rod also indicates a trend of first increasing and then decreasing with the increase of Ni content， and when the Ni content is 0.5%， the effective stress is the lowest. Compared to the alloy without Ni addition， the alloy with 0.5%Ni addition shows a significant reduction in hot tearing sensitivity， a substantial improvement in mechanical properties， an increase of 54.79% in tensile strength， an increase of 48.49% in yield strength， and an increase of 461% in tensile strain. The numerical simulation results are in good agreement with the experimental results.
Continuous silicon carbide fiber reinforced silicon carbide （SiCf/SiC） ceramic matrix composites are considered as the most promising advanced materials in the fields of hot end components of aviation turbine engines and thermal protection structures of novel aerospace aircraft due to their excellent comprehensive properties， such as light weight， high strength and toughness， high temperature resistance， and oxidation resistance. In this paper， the preparation technology of the four elementary components of SiCf/SiC composites， such as SiC fiber， interphase， SiC matrix，and environmental barrier coating （EBC）， has been systematically reviewed， and the bottleneck problems of SiCf/SiC composites in the future development have been proposed. The current third-generation SiC fibers possess a near stoichiometric C/Si ratio and have excellent high temperature stability and mechanical properties. The structure and oxidation resistance of interphase plays a decisive role in the mechanical properties of SiCf/SiC composites in harsh service environments. The research frontiers are to develop novel interphases that matches SiC fiber and has excellent oxidation resistance，achieving continuous and uniform preparations of such interphases. PIP， CVI and RMI techniques are commonly employed to prepare SiCf/SiC composites， but a single technique no longer meets the performance requirements of the composite. Hence， a hybrid technique such as the hybrid CVI-PIP technique has been employed to manufacture SiCf/SiC composites， through which processing parameters， microstructures， and mechanical properties have been widely investigated. Environmental barrier coatings are used as a barrier to prevent SiCf/SiC composites from corrosion and degradation by external corrosive environments. Based on the third generation Si/Yb2Si2O7 EBC system， highly reliable and long life-span environmental barrier coatings can be prepared by supplementing Si sources and self-healing cracks， thereby greatly improving the service life of SiCf/SiC composites components. To achieve a wider application of SiCf/SiC composites， further research work should be carried out in areas such as the structural design of composite components， low-cost manufacturing， development of new anti-oxidation interphases， development of novel EBCs with anti-peeling off and anti-cracking natures， failure analysis and life prediction of composite.
Zirconia toughened alumina （ZTA） ceramics exhibit excellent mechanical properties compared to single-phase Al2O3 and ZrO2 ceramics， demonstrating broader application prospects in high-end industrial fields such as electronics， biomedicine， and semiconductors. This paper reviews the toughening mechanism of ZTA ceramics and summarizes recent research progress， both domestic and international， on three aspects： powder preparation， sintering methods， and the introduction of the third phase. It focuses on analyzing the role of third-phase incorporation in ZTA ceramics through the use of various sintering techniques and processing methods. Finally， it points out that the nano-structuring of powders， fine control of advanced sintering techniques， and exploration of the microstructure through third-phase modulation are key directions for future research.
The effect of different cold drawing deformations and annealing temperatures on the microstructure and tensile properties of Al-Si-Sc-Zr alloy wires is investigated by the mean of electron backscatter diffraction technique. The results show that the grains are elongated and refined along the drawing direction， accompanying with the fibrous structure and a typical〈111〉deformation texture with strain increasing. However， when the drawing strain increases from 0.61 to 0.76， the average grain size increases and the proportion of low-angle grain boundaries decreases due to the recrystallization behavior in the grains. Furthermore， the tensile strength and yield strength of the wire increase to 181.5 MPa and 166.5 MPa， respectively， due to the work hardening induced by the cold drawing process. When the cold-drawn wires are subjected to the annealing treatment at 350-450 ℃ for 2 h，the fibrous cold-drawn structure is transformed into fine equiaxed grains， and the typical cube texture ｛100｝〈001〉 is formed. This annealing treatment can significantly eliminate the work hardening caused by the cold drawing. In this case， the yield strength decreases from 166.5 MPa to 84.0 MPa， meanwhile the elongation after fracture increases from 2.1% to 9.5%. The annealed structure is uniform and stable， which is favorable to subsequent cold drawing processes.
The micro-sized second-phase and recrystallized structure has an important influence on the strength and toughness of 5083-O alloy. In order to acquire the morphological feature of the micro-sized second-phase particles and recrystallized particles in 5083-O alloy， multi-slices EDS data at a low acceleration voltage of 5 kV and EBSD data at 20 kV of the alloy are collected based on the double beam microscope system. These multi-slices data are restructured into three-dimensional types by Avizo software. The size， morphology， distribution， and volume fraction of the chief second-phases （Mg2Si phase and Fe-rich phase） and recrystallized structure are obtained through the restructured data. The results show that the volume fractions of Mg2Si phases， Fe-rich phases， and recrystallized particles in the studied alloy are 0.46%，0.25%， and 11.7%， respectively. Most Mg2Si particles have smooth surfaces， with shapes of near-spherical， near-ellipsoid， or rod-shaped， and elongate along the rolling direction. The Fe-rich phases in the alloy are angular or subangular， and have relatively low spherical degrees. The three-dimensional EBSD restructure data show that the smaller size recrystallized particles have the higher spherical degrees， and the bigger size recrystallized particles have the lower spherical degrees. It is found that the recrystallized grains grow up from the small sphere recrystallized particles during the annealing process， and grow fastest along the rolling direction. The morphology of recrystallized particles is more truly reflected by three-dimensional EBSD results.
The addition of a burning rate catalyst can affect the decomposition of oxidants and effectively regulate the burning rate of solid propellants. MOFs have aroused attentions due to their excellent properties in catalyzing the thermal decomposition of ammonium perchlorate （AP）， and existing research has mainly focused on changes in metal centers， without discussing the influence of ligands on the catalytic process. We prepare three types of Co-based complexes （Co-CP） catalysts using three different ligands （2-methylimidazole， terephthalic acid， and 1，2，4，5-phenylenetetramine） and discuss their effects on the thermal decomposition behavior of AP. The results indicate significant differences in the decomposition behavior of the three Co-CPs in AP due to differences in ligands. Co-ZIF can significantly reduce the decomposition temperature of AP while enhancing the heat release of the system. The relatively high thermal stability of Co-BDC affects the catalytic effect of AP thermal decomposition. Co-BTA can delay the low-temperature decomposition of AP by releasing NH3 through ligand decomposition. The gas-phase products during the reaction process are captured through thermogravimetric infrared spectroscopy （TG-IR） testing， and the possible mechanisms of AP decomposition catalyzed by different Co-CPs are further explored and discussed. This study provides a design approach for a metal complex-based combustion rate catalyst.
To solve the corrosion problem of La（Fe， Si）13 magnetic refrigeration material in the heat exchange medium， an attempt is made to partially replace Fe element with Ni element. The magnetocaloric properties of LaFe11.832- x Ni x Si1.4（x=0，0.1，0.2，0.3，mass fraction，the same below） alloys before and after the substitution， as well as the corrosion behavior in different media， are systematically studied. The results show that when the Ni content is less than 0.2， LaFe11.832- x Ni x Si1.4 can maintain good magnetocaloric performance. Its magnetic entropy change under a 2 T magnetic field can reach 15.31 J/（kg·K）（x=0.1） and 14.00 J/（kg· K） （x=0.2）， and the relative magnetic cooling capacity is 151.6 J/kg and 156.8 J/kg， respectively， with significantly reduced magnetic hysteresis loss. In deionized water， the corrosion current I corr of LaFe11.832- x Ni x Si1.4 alloy decreases from 2.6159 μA/cm2 to 2.0863 μA/cm2 with increasing Ni content. The maximum corrosion inhibition efficiency of LaFe11.832- x Ni x Si1.4 alloy in combined inhibitor of 4 g/L BTA+1 g/L Na2MoO4·2H2O is 77.06%， showing a good corrosion inhibition effect. The LaFe11.832- x Ni x Si1.4（x≤0.2） alloy with 4 g/L BTA+1 g/L Na2MoO4·2H2O can be used as an alternative combination of working fluid and medium for practical magnetic refrigerators.
A comprehensive long-term aging study has been conducted on the third-generation nickel-based single-crystal superalloy DD10 at temperatures of 900 ℃ and 1050 ℃. This investigation systematically analyzes the microstructural evolution disparities between dendrite regions， as well as the evolution of the distribution characteristics of the γ' phase and TCP phase under various aging conditions. The results indicate that during aging at 900 ℃， the γ' phase undergoes gradual coarsening and growth with increasing aging time. Conversely， at 1050 ℃， the γ' phase coarsens rapidly and retains a cubic shape after 100 h of aging. The trend of γ' phase coarsening and growth is consistent between dendrite regions， with minimal difference in the average size of the γ' phase within these regions under the same aging duration. Quantitative statistical analysis reveals that the coarsening of the γ' phase aligns with the Lifshitz-Slyozov-Wagner （LSW） model. Following aging at 1050 ℃ for 500 h or more， the γ' phase within the dendritic core adopts an irregular shape， and stress within the dendrites leads to the formation of a valuated structure in the γ' phase between dendrites， with the valuation direction coinciding with the primary dendrite growth direction ［001］. During aging at both 900 ℃ and 1050 ℃， TCP phase precipitation between dendrites is minimal， whereas the TCP phase volume fraction within dendrite stems increases significantly with increasing temperature and time. After aging at 1050 ℃ for 2000 h， the TCP phase volume fraction reaches 8.25%. Compositional analysis suggests that the TCP phase is likely the μ phase. Equilibrium phase diagram calculations confirm the precipitation of the μ phase in the alloy at the experimental temperatures， and TTT curve calculations indicate that the time required to precipitate the same volume fraction of μ phase is longer at 900 ℃ compared to 1050 ℃.
IC21 alloy， as a new Ni3Al-based single crystal superalloy， has become an ideal material for manufacturing a new generation of aero-engine turbine guide vanes due to its high melting point， excellent high-temperature performance， and creep resistance performance. However， turbine guide vanes have complex structures， such as deep holes and deep and narrow slots， which are difficult to be processed efficiently by traditional machining techniques. Electrochemical machining has become the main method for processing such complex structures due to its advantages， such as no tool loss， high material removal rate， and no cutting stress and thermal effect. This paper focuses on the electrochemical dissolution behavior of IC21 nickel-based single crystal alloy in NaCl and NaNO3 electrolytes. The electrochemical reaction characteristics of IC21 alloy in different electrolytes are analysed by linear scanning voltammetric polarisation curve measurements. In addition， the dissolution characteristics and selective dissolution phenomena of the alloy under different electrolytes and current densities are investigated by current efficiency measurements and surface micro-morphology analysis. It is shown that IC21 alloy exhibits typical passivation-super-passivation transition phenomena in both NaCl and NaNO₃ electrolytes， in which the oxide layer formed in NaNO3 electrolyte exhibits higher stability. Current efficiency measurements show that the dissolution efficiency of IC21 alloy is more stable in NaCl electrolyte， and the dissolution efficiency in NaNO3 electrolyte gradually decreases with the increase of the current density， which exhibits different characteristics from the traditional theory. The dissolution surface morphology analysis further reveals the existence of the selective dissolution phenomenon of IC21 alloy under ECM conditions， and its microscopic mechanism is discussed. Based on the above experimental results， a theoretical model of electrochemical dissolution of IC21 alloy under different electrolyte and current density conditions is established， which provides a theoretical basis for the development and application of ECM processes for IC21 alloy.
To explore the feasibility of the nonlinear ultrasonic method in the aging microstructure evolution application of directionally solidified nickel-based superalloy， DZ411 directionally solidified nickel-based superalloy is studied.The microstructure observation， γ΄ phase quantitative characterization， nonlinear ultrasonic detection， and lattice mismatch analysis of DZ411 alloy under different aging conditions are carried out by using nonlinear ultrasonic detection technology， combined with SEM and XRD. The correlation between nonlinear ultrasonic coefficient and quantitative parameters of microstructure evolution is discussed. The results show that with the extension of aging time， the γ΄ phase size increases， the γ΄ phase changes from cubic to spherical， the cubic degree decreases， the particle density decreases， and the normalized ultrasonic nonlinear coefficient increases exponentially. The nonlinear ultrasonic coefficient is positively correlated with the lattice mismatch， and the γ΄ phase equivalent diameter， and negatively correlated with the γ΄ phase area fraction. The analysis shows that the above phenomenon is attributed to the full diffusion of alloying elements and the redistribution of solute atoms at the two-phase interface during the aging process， increasing the γ΄ phase size and the lattice strain at the two phase intorface， enhancing the interference of the local stress-strain field on the propagation characteristics of the ultrasonic wave and aggravating the distortion of the ultrasonic wave at the two-phase interface， thus promoting the generation of harmonic components and the enhancement of nonlinear effects.
Ferrite， a prevalent magnetic loss absorbing material， underscores the significance of its preparation method in determining both its structure and absorbing properties. Traditionally， ferrites are predominantly synthesized through solvothermal or hydrothermal methods， which entail substantial energy consumption and exhibit limited compatibility with other materials. Octahedral Fe3O4 is successfully synthesized via a low-temperature （50 ℃） co-precipitation process， utilizing ferrous chloride as the iron source. The oxidation reaction is meticulously controlled using potassium nitrate. Furthermore， the absorption effectiveness of the resultant product under various reaction conditions is thoroughly examined. Notably， the composite material formed by combining NiCo2O4 and Fe3O4 exhibits superior absorbing properties. This low-temperature approach not only mitigates the demands on equipment and energy consumption but also enhances material compatibility， thereby significantly expanding the application scope of ferrite materials.
Due to the its appropriate glass transition temperature（T g）， a kind of carbon reinforced carbon-reinforced composite with exhibiting a shape memory effect is successfully fabricated using a layer-by-layer method. A thermoplastic polymer with a relatively low T g served as the switching phase， while a cured epoxy with a relatively high T g functioned as the permanent phase. The shape memory composite is then molded using an autoclave. The results demonstrate that the composites exhibit a high shape memory effect， with shape retention rates ranging from 90% to 95% and a shape recovery rate of 95%. By leveraging the high design properties of composites， two types of materials are combined to create a novel composite with a shape memory effect.
High volume fraction SiCp/Al composites characterized by high modulus and low expansion have great application potential in the field of aerospace precision instruments. In this application scenario， it is necessary to deepen the study of the dimensional stability of the materials and further improve the precision stability of components. Three kinds of SiC particle-reinforced high volume （55%） aluminum matrix composites with the average particle size （D 50） of 14， 76 μm， and gradation of 14 μm and 76 μm are treated with different dimensional stabilization treatments， such as the solid solution aging， the thermal-cold cycling treatment with different temperature parameters after the solid solution， the thermal-cold cycling treatment， etc. After the treatment， the dimensional stability of the samples is tested with the control samples for five times at a low temperature of 180 ℃ thermal loading environment. The results show that compared with the 14 μm particle-reinforced samples， the 76 μm particle-reinforced samples and the gradation of 14 μm and 76 μm particle-reinforced samples show better dimensional stability， the size change rate （dV/V） of the control samples can be stabilized at about 1×10-3. Among the five dimensional stabilization treatment regimes， the effect of -196-191 ℃ （4 times） thermal-cold cycling treatment after the solid solution is the most significant， the size change rate （dV/V） of the samples after this treatment can be stabilized at 10-4 orders of magnitude. According to the comparison of X-ray diffraction patterns， the thermal-cold cycling treatment after the solid solution can promote the precipitation of the strengthening phase of Al2Cu significantly.
The stability of micro-droplet ejection and size on-demand are important prerequisites for the direct preparation of bumps in chip packaging. The ejection experiment of SAC305 commercial lead-free solder is carried out by pulsated orifice ejection method （POEM）. The effects of the interaction of parameters such as the pulse waveform， the distance between the transmission rod and the orifice and the orifice， diameter on the ejection stability and particle size during the droplet ejection process are investigated. The surface morphology and microstructure， composition， and phase composition of the solder ball are analyzed. The results show that the stable ejection of droplets and the control of size-on-demand can be realized by coordinating the key process parameters. The deviation between the target particle size and the actual size is within 4%， which can meet the needs for the stable on-demand preparation of bumps. The results of temperature change during droplet solidification show that the cooling rate in the argon atmosphere is much lower than that in the helium atmosphere， so the microstructure is coarser. Combined with the above results， the bumps are directly deposited on the copper plate to form a metallurgical layer， which shows the feasibility of the technology and provides a new way for the direct preparation of bumps.
In view of the environmental pollution caused by organic dye wastewater in the process of economic development， magnesium hydroxide/diatomite composites are prepared by the in-situ precipitation method， and their adsorption performance is studied with methyl orange as the target pollutant. The magnesium hydroxide/diatomite composites are characterized by XRD， SEM， FT-IR and BET. The adsorption effects of the dosage， initial pH value， and initial concentration of the target pollutant on methyl orange are explored. The results show that the adsorption effect is the best when the dosage of magnesium hydroxide/diatomite is 0.5 g， the pH value is 8， and the concentration of methyl orange is 8 mg/L， and the adsorption rate of the composite reaches 93.34%. Compared with modified diatomite， the adsorption rate increases by 41.34%. The adsorption kinetics model， isothermal adsorption model， and adsorption thermodynamic model are used to analyze the adsorption process. The results show that the adsorption process is spontaneous endothermic and entropy-increasing， which conforms to the Freundlich isothermal adsorption model and quasi-second-order kinetic model， with chemical adsorption as the main mechanism. The composite material shows good reusability in cyclic verification experiments.
Orthogonal experiments have been carried out to study the optimal process conditions for the preparation of sargassum-based activated carbon with different impregnation ratios， impregnation times， activation temperatures， and activation times based on the self-templated “egg-box” structure using sargassum as the raw material and ZnCl2 as the activator. The characterization of N2 adsorption， SEM， and XRD investigate the pore structure properties， surface morphology， and crystal structure of the activated carbon. The electrochemical properties of sargassum-based activated carbon are tested. The optimum process conditions for preparing high specific capacitance activated carbon are analyzed by orthogonal experimental method and obtained as follows： impregnation ratio is 3， impregnation time is 2 h， activation temperature is 700 ℃， and activation time is 2 h. Under nine sets of experimental conditions， the prepared activated carbon SAC7 exhibits the best electrochemical performance， the specific capacitance of activated carbon SAC7 is as high as 136.4 F/g when the current density is 0.5 A/g， and its specific capacitance is as high as 92.0 F/g when the current density is 5 A/g， which shows a superior specific capacitance and rate performance. After 10000 cycles of charging and discharging， the SAC7 still has a capacitance retention rate as high as 99.41%， with excellent cycling stability.
Renewable energy plays a crucial role in sustainable development amidst the global energy crisis. Hydrogen， owing to its high calorific value and environmental benignity， emerges as a promising energy source for the future. Hydrogen produced through water splitting boasts high purity， zero pollution during production， and recyclability， thereby holding vast potential. Platinum （Pt） stands out as an exceptional catalyst for the hydrogen evolution reaction （HER）. While commercial Pt/C exhibits high alkaline HER performance， its high cost， material instability， and scarcity hinder widespread adoption. Consequently， this study focuses on developing a high-performance， low-cost， and less-noble transition metal electrocatalyst for HER via water splitting. Utilizing the thermal decomposition method， the heterostructural RuO2-NiO/NF electrode can be industrially produced based on heterogeneous interface engineering. Specifically， Ni（OH）2 and RuO2·H2O precursors are applied to a nickel foam （NF） substrate using a binder， followed by heating at 450 ℃ for 3 h in air to facilitate precursor decomposition， thereby successfully preparing RuO2-NiO/NF heterostructure electrocatalysts. The RuO2-NiO/NF electrodes exhibit remarkable catalytic activity and stability in alkaline HER. Characterization， testing， and density functional theory （DFT） calculations reveal that the heterostructural interface formed by the binding of RuO2 and NiO significantly enhances catalyst performance. At the interface， charge transfer results in the creation of dual active sites， enabling selective adsorption of different adsorbates at distinct active sites. This synergistically promotes the fundamental reactions of water splitting， leading to exceptional alkaline HER catalyst performance. Under a current density of 10 mA·cm-2 in 1 mol·L-1 KOH solution， an overpotential of 52 mV and a Tafel slope of 47.5 mV·dec-1 are achieved. Additionally， the turnover frequency （TOF） at 100 mV reaches 0.342 s-1， and a stable potential is maintained at a current density of 200 mA·cm-2 after 100 h of stability testing. In summary， a heterostructure RuO2-NiO/NF electrocatalyst has been successfully developed based on interface engineering principles， with a comprehensive investigation of its HER catalytic mechanism. This provides a novel perspective for constructing heterostructure catalysts based on Ni compounds and their application in electrocatalysis.
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