Abstract:Additive friction stir deposition （AFSD） technology， as an emerging additive manufacturing method， has attracted widespread attentions in the field of materials science and engineering in recent years. This study summarizes the results of research on the evolution of material temperature， plastic flow and microstructural changes during the additive process from the perspective of AFSD forming mechanisms. The influence of additive passes and process parameters on the mechanical properties of AFSD additive parts is discussed in depth. The domestic and international development progresses of AFSD additive tools and equipments are introduced in detail， which provide new ideas for the application prospects and development directions of AFSD.

Abstract:This review paper provides an overview of the advancements made in the synthesis of γ -AlON powders using the carbothermal reduction nitridation method. Firstly， the properties of γ-AlON ceramics are briefly introduced. Subsequently， the focus shifts towards the raw materials， mixing methods， and synthesis processes involved were summarized and influence of each factor on the performance of γ-AlON powders within the carbothermal reduction system were analyzed in detail.Finally，the paper concludes with a summary of the current state and future directions of the synthesis of high-quality γ-AlON powders through carbothermal reduction nitridation.

Abstract:This paper introduces the development of high entropy oxide aerogel， and summarizes the synthesis methods， structural properties and applications of high entropy oxide aerogel. It will be a development direction to investigate the temperature resistance mechanism of high entropy oxide aerogel by combining theoretical simulation and experiment.

Abstract:In order to improve the accuracy of circular braiding， an algorithm to generate the mandrel traction trajectory according to the mandrel shape and the target braid angle was proposed. In the trajectory generation stage， the changes in the length and angle of the convergence zone in the transient process were considered， and a dynamic braiding model was proposed to improve the generation accuracy of the traction trajectory. In the trajectory sampling stage， the spatial characteristics and speed characteristics of the trajectory were considered at the same time， and an adaptive sampling algorithm was used to make the sampled trajectory as close to the original trajectory as possible to ensure the final braiding accuracy. Simulation and physical tests show that for complex mandrels and non-constant target braid angles， the algorithm in this paper has a smaller braid angle error.

Abstract:To address the complexity of simulation procedures for composite curing deformation analysis using Abaqus， a Python-based auxiliary plugin was developed to standardize pre-processing operations and enhance the intuitiveness and efficiency of simulation setup. This plugin was subsequently employed to conduct curing simulation analysis on an L-shaped composite structure， with comparative validation against experimental data. Results demonstrate that the integrated plugin features a concise interface and operational effectiveness， establishing a valid finite element model. The simulation outcomes exhibit good agreement with experimental measurements， showing an average error of 4.83%. Furthermore， the model was utilized to investigate the influence of cooling rates on curing deformation. It was revealed that increasing cooling rates （0.3， 0.6， and 1℃/min） progressively improved the forming accuracy of composite structures. This study provides a valuable reference for rapid prediction of curing deformation distribution patterns in diverse composite structural components.

Abstract:To further investigate the grain growth behavior of Inconel X-750 superalloy， artificial neural networks were employed in this work. The grain growth tests of Inconel X-750 superalloy were carried out to obtain the grain distributions under different holding temperatures and holding times， and the influences of the holding temperature and holding time on the size and non-uniformity of grains were investigated. The artificial neural network based grain growth model involving grain non-uniformity was constructed with the holding temperature and holding time as inputs， and average grain size and coefficient variation of grain size as outputs. The relationships between the grain size， grain non-uniformity， holding temperature and holding time under isothermal condition were established by predicting the grain sizes and grain non-uniformities in wide process parameter range using the constructed grain growth model. The results show that the neural network model for grain growth possesses high precision.

Abstract:In order to solve the problems of heavy weight and large volume of thermal control systems for the aerospace applications， in this study， a PTC （Positive Temperature Coefficient） material based on RT-vulcanized silicone rubber was synthesized via the solution blending method. The composite comprised RT-vulcanized silicone rubber as matrix， and carbon black （CB）， carbon nanotubes （CNTs）， and nickel （Ni） as conductive fillers. Additionally， various additives were incorporated into the composite. To evaluate the material''s performance， its resist-temperature characteristics and automatic temperature regulation capabilities were assessed， confirming its PTC effect and temperature control efficiency. Furthermore， the microstructure of the material was analyzed， leading to the proposal of a theoretical model for the cross-linking expansion structure. The results demonstrate that when the filling amount of CB/CNTs/Ni mixture is 16wt%， the room temperature resistivity of the composite material is significantly reduced to 19.95 Ω·cm， exhibiting a high PTC strength of 4.73. Additionally， after undergoing 300 cold and hot cycles， excellent heating and temperature control performance of the composite are preserved. Thermogravimetric （TG） analysis demonstrates that the incorporation of CB/Ni/CNTs significantly enhance the thermal stability of silicone rubber. Scanning electron microscopy （SEM） reveals that CNTs with a high aspect ratio exert a notable inhibitory effect on the agglomeration of carbon black （CB）. X-ray diffraction （XRD） analysis indicates that the dispersion of conductive fillers within the silicone rubber matrix is relatively uniform. Based on the analysis of microstructure， the internal conductive network channels and structural changes are compared and analyzed， and an analytical model of factors affecting the PTC effect is constructed， which provides a feasible reference for solving the problem of weight reduction of the thermal control system in the field of aviation.

Abstract:Through comparative analysis of microstructural properties of sheets processed via different hot working processes while avoiding cold rolling， an optimal process scheme was developed to address the poor matching between mechanical properties and bending formability of 4.0 mm TA5 sheets， thereby facilitating high-quality industrial mass production. The research indicates that β-quenching combined with warm rolling at 550℃ can rapidly refine slab microstructure by introducing multi-dislocations and substructures， effectively enhancing sample strength. For samples without β-quenching treatment， elongation and bending performance exhibit upward trends， showing a fundamentally positive correlation between bending formability and elongation. When TA5 ingots undergo hot breakdown rolling in the single-phase region to 9 mm， followed by 940℃ rolling to 5 mm， then warm rolling at 550℃ from 5 mm to 4 mm， and finally 650℃ annealing for 40 minutes with air cooling， uniform fine equiaxed microstructures can be achieved.

Abstract:In order to improve the room temperature conductivity and the performance in restraining the growth of lithium dendrites of polyethylene oxide （PEO）， ZrCl₄ doping modification method was used to improve the structural stability of sulfide electrolyte as active filler in PEO matrix. The sulfide material Li_6.10Zr_0.10P_0.90S₅Cl （LPSC-10） with ionic conductivity up to 1.90 mS /cm was optimized and selected as the filler for All-solid-state lithium battery （ASSLBs）. The results show that the PEO-based solid electrolyte has excellent properties， including high ionic conductivity （0.44 mS/cm， 60℃）， moderate Young''s modulus （13.7 MPa） and excellent interfacial stability. The Li|Li （0.1 mA/cm² for 600 h） and Li|LiFePO₄ batteries at 60℃ （capacity maintained at 99.2% after 200 cycles at 2C） have excellent cycle stability. This work is expected to promote the development of ASSLBs with high electrochemical performance and provide reference information for the further development of battery technology of the rocket and others.

Abstract:Currently， there is limited research on the tribological properties of frictional pairs composed of C_f/C-ZrO₂ and C_f/C-Si₃N₄， particularly regarding the influence of temperature on their friction behavior. Therefore，the effect of initial temperature on the tribological performance of these two pairs were investigated in this work. Friction tests were conducted using pin-on-disc configurations where C_f/C composites were paired with zirconia （ZrO₂） and silicon nitride （Si₃N₄），respectively. The variations in friction coefficient， wear loss， and friction interface morphology under initial temperatures ranging from 200℃ to 700℃ were systematically analyzed.The results indicate that below 400℃， the average friction coefficient of the C_f/C-ZrO₂ pair is lower than that of the C_f/C-Si₃N₄ pair， with both pairs exhibiting mixed wear mechanisms dominated by abrasive wear and adhesive wear. Above 400℃， the average friction coefficient of the C_f/C-ZrO₂ pair surpasses that of the C_f/C-Si₃N₄ pair， and the wear mechanism transitions to a combination of abrasive wear and oxidative wear. Under all tested temperatures， the wear rate of the ZrO₂ disc is consistently lower than that of the Si₃N₄ disc. As the initial temperature increases， the oxidative wear of the C_f/C pin intensifies， leading to a gradual rise in wear rate. When the initial temperature exceeds 800℃， the C_f/C composite fails to maintain its stable macroscopic woven structure， undergoing thermal oxidation and structural degradation.

Abstract:In order to solve the contradiction between processing fluidity and mechanical strength of silica reinforced liquid silicone rubber， three kinds of fumed silica with typical structural characteristics were used as reinforcing fillers of silicone rubber. By means of particle size analysis of silica， rheological and mechanical properties test of silicone rubber and atomic force microscope analysis， the effects of surface characteristics and aggregation structure on rheological and mechanical properties of silicone rubber were comparatively studied and analyzed. The results of particle size analysis and atomic force microscope analysis show that fumed silica HT200 with organic surface modification and optimized aggregation structure has smaller aggregation structure size and more uniform particle size distribution. The results of rheological and mechanical properties analysis show that HT200 has the weakest tackifying effect on liquid silicone rubber among the three kinds of silica. When the amount of HT200 is 50 phr， the viscosity of the compound is 1045 Pa·s， which is significantly lower than that of the liquid silicone rubber filled with IPC300 and R812S with the same amount. Meanwhile， the silicone rubber has excellent tensile properties， and the tensile strength and elongation at break are 8.2 MPa and 1590 % respectively. The results show that the organic modification of silica surface and the optimization of aggregation structure can obviously improve the dispersion uniformity of silica in liquid silicone rubber， reduce the tackifying effect of silica， and effectively coordinate the contradiction between rheological properties and mechanical properties of liquid silicone rubber， which has important reference significance for the design of high-performance liquid silicone rubber formula.

Abstract:According to the image blur problem caused by scattering photon which was received by detector in the CT detection progress of C/C composites， a mathematical model was established which described the physical processes such as absorption and scattering of photon. The mathematical model was solved by Monte Carlo method. Based on these， this work proposed a scatter correction method with photon transport and conducts comparison analysis on different size of C/C composites. The research indicates that the mathematical model built in this paper can describe the physical processes such as absorption and scattering of photons exactly， the proposed method could effectively suppress the scattering photons and improve the image quality. With the growing size of C/C composites， the effect of scattering photon on the image quality is greater. As the decreasing size of C/C composites， the greater scatter correction and high sensitive obtained. The method in this paper can effectively improve the density resolution of images and the detection ability of C/C composite defects.

Abstract:3J40 alloy is a kind of high-strength， high-hardness， wear and corrosion-resistant alloy with high Cr and Al content used in precision instruments industry. This paper studies the deformation process and failure mechanism of 3J40 shaft tine under compressing load based on a failure analysis case in which 3J40 shaft tine and red corundum compress with each other. The crack and fracture morphology were investigated by stereoscopic microscope and scanning electron microscope （SEM）. The stress distribution and failure mechanism were also analyzed for shaft tine serving state using finite element analysis. The results indicate that the spherical surface of 3J40 shaft tine was compressed to a plane under compressing load of red corundum surface， forming a Φ220 μm plain zone. The shaft tine fracture is ductile， and the shear stress peaks at the contacting rim of shaft tine and plane. Thereafter cracks form at the shear source and expand in axial direction and then turn around 90° at waist zone of the shaft tine. Theoretical estimation and finite element analysis were conducted based on Hertz contacting theory. The results show that large shear stress and strain exist in the 3J40 material which results in a shear failure mechanism. The results are significant for the performance optimization and structure design of shaft tine materials.

Abstract:In order to study the influence of the thermal effect of electric pulse on the cutting process of titanium alloys， the TC11 titanium alloy was preheated using the pulse current， the effect of thermal effect of electric pulse on cutting temperature， chip formation， workpiece surface morphology， workpiece surface roughness， etc. was studied. And the cutting process was simulated by finite element using Abaqus software to analyze the temperature field and strain field of cutting zone during the cutting process， the influence of the thermal effect of the electric pulse on the cutting performance of TC11 titanium alloy was revealed. The results showed that with the gradual increase of workpiece surface temperature， the plasticity of TC11 titanium alloy material was improved， the equivalent plastic strain of the cutting process was increased， the surface morphology of the workpiece became smooth， the surface roughness value was decreased， and the chip serrated degree was decreased. When the workpiece surface temperature was increased from 140°C to 180°C， the surface oxidation of the workpiece surface appeared， the hardness of the workpiece surface was enhanced， the surface morphology of the workpiece became rougher， the deformation coefficient and the separation degree of chip were reduced and enhanced， respectively. The thermal effect is as part of the electroplastic effect， the appropriate thermal effect can improve the plasticity of the workpiece surface material， the cutting performance of TC11 titanium alloy has a significant beneficial effect， but excessively high temperature leads to the workpiece surface oxidation and the hardness enhancement， worsening the cutting performance. Therefore， the thermal effect of electric pulse needs to be reasonably controlled in practical application to achieve the best cutting performance.

Abstract:To explore the influence of fiber orientation angle and cutting depth on the removal mechanism cutting force ， and surface quality of carbon fiber-reinforced polyetheretherketone （CF/PEEK） composites， different cutting depths and cutting speeds were set up， and orthogonal cutting experiments on CF/PEEK were carried out. The experimental results demonstrate that the fiber orientation is the primary factor affecting the machining process of CFPEEK. Continuous and curled chips are formed at 0° and 45°， and the curvature of the chips is associated with the cutting depth， At 90° and 135°， continuous chips are formed when the cutting depth is relatively small， while above a cutting depth of 0.1 mm， fragmented chips are formed， accompanied by extremely serious damage. Analysis on the machined surface morphology reveals that， unlike the processing of traditional thermosetting composites， due to the properties of the matrix， CF/PEEK exhibits acts differently in chip continuity and machined surface quality.