最新刊期
卷 46 ， 期 1 ， 2026
- “在高温合金领域，研究揭示了热处理对SLM制备GH4099合金性能的显著提升作用，为增材制造镍基高温合金性能优化提供了新思路。”摘要：The effects of heat treatment on microstructure and mechanical properties of GH4099 superalloy fabricated by selective laser melting （SLM） were investigated. The results indicate that the microstructure of as-deposited specimens consists of epitaxially grown columnar grains. After heat treatment， the melt pool boundaries disappear， meanwhile the dislocation density is significantly decreased， and the columnar grains are replaced by smaller equiaxed grains， accompanied by the precipitation of large amounts of γ′ phase. The comparison of room temperature tensile properties before and after heat treatment reveals that the heat-treated specimens exhibit desirable strength and plasticity. Therefore， heat treatment can significantly enhance the mechanical properties of SLMed GH4099 superalloy， which plays a critical role in performance enhancement of nickel-based superalloys by additive manufacturing.关键词：Selective Laser Melting;GH4099 Superalloy;Heat Treatment;Microstructure;Mechanical Properties4|0|0更新时间：2026-01-19
Current Recommendation
- “据最新报道，Mo-Si基合金高温氧化行为研究取得进展，为提升合金使用寿命提供新思路。”摘要：Mo-Si based alloy possesses excellent mechanical properties at high temperatures. However， the oxidation problems under high temperatures constantly affects the service life of the alloy and restricts its further development. Based on the oxidation behavior of Mo-Si alloy at high temperatures， the influence of multiple factors on the oxidation process was systematically analyzed in aspect of alloying， impact of grain size， and formation and action of stress during oxidation. Finally， the future research on oxidation resistance of Mo-Si based alloy was prospected.关键词：Mo-Si Based Alloy;Oxidation Resistance;SiO2 Protective Film;Oxidation Kinetics3|0|0更新时间：2026-01-19
Research·Review
- “在精密铸造领域，专家建立了陶瓷烧结数学模型，优化了复杂陶瓷型芯件的烧结工艺方案，确定了最佳工艺参数。”摘要：The ceramic cores formed by binder jetting are one of the key factors in achieving investment casting of components with complex cavity structures. To describe the stress-strain and dimension variation of alumina ceramics during the sintering process in binder jetting， a mathematical model for ceramic sintering was established based on the principles of continuum mechanics and thermal viscoelastic constitutive relationships. Corresponding experiments were designed to calibrate parameters in the model， such as viscosity modulus， sintering stress， Poisson's ratio， and thermal expansion coefficient. Cylindrical specimens were selected， and numerical simulations were carried out using a self-developed ceramic sintering solver. By comparing experimental results， the applicability and reliability of model were validated. Numerical simulation research was conducted on actual complex ceramic cores， and the sintering process was optimized to determine the optimal process parameters： A heating rate of 2 ℃/min during the debinding stage， a heating rate of 5 ℃/min during the high-temperature sintering stage， a sintering temperature of 1 300 ℃， and heat preservation of 2 h.关键词：Investment Casting;Binder Jetting;Ceramic Core;Sintering Process;Numerical Simulation4|0|0更新时间：2026-01-19
- “在铝合金三通阀体制造领域，专家通过响应面试验设计和多目标优化，显著提升了成形质量，验证了优化工艺方案的可行性。”摘要：Taking a certain aluminum alloy three-way valve body as object， a response surface experimental design was established based on Box-Behnken method with pouring time， pouring temperature， mold temperature， and heat transfer coefficient of casting as factors， and the volume of shrinkage porosity and secondary dendrite arm spacing as response targets， and numerical simulation was conducted. NSGA-Ⅱ algorithm was employed for multi-objective optimization， and optimized parameters were utilized for numerical simulation verification. The results indicate that the forming quality of aluminum alloy valve body are significantly improved with the pouring time of 7 s， pouring temperature of 715 ℃， mold temperature of 340 ℃， and casting heat transfer coefficient of 2 700 W/（m2·K）， compared to initial scheme. The feasibility of optimized process plan was verified through product trial production and metallographic analysis.关键词：Metallic Gravity Casting;Response Surface Methodology;Numerical Simulation;Multi-objective Optimization3|0|0更新时间：2026-01-19
- “在铜合金领域，专家采用真空热压炉对Cu-18Ni-2W合金粉末进行热压试验，建立了基于响应面法的预测模型，优化工艺参数，获得高熔点及高热导率的铜合金。”摘要：In order to obtain copper alloys with high melting point and thermal conductivity， Cu-18Ni-2W alloy powder was subjected to constant temperature and isobaric hot pressing experiments under the conditions of hot pressing temperature of 800~900 ℃， hot pressing pressure of 20~30 MPa and hot pressing holding time of 1~3 h in vacuum hot pressing furnace. The properties of the alloy under different process parameters （thermal conductivity， melting point and tensile strength） were calculated. The prediction model of process parameters based on response surface method was established， and multi-factor and multi-objective visual optimization was performed to obtain optimized process parameters.The prediction model based on response surface method possesses high precision， and the optimal process parameter is determined as hot pressing temperature of 870 ℃， holding time of 2.4 h and hot press of 28 MPa. On this condition， the melting point， thermal conductivity and tensile strength of the alloy reach 1 165.4 ℃， 39.8 W/（m· K）， and 351 MPa， respectively.关键词：Cu-18Ni-2W Alloy;Vacuum Hot Pressing;Parameter Optimization;Response Surface Method3|0|0更新时间：2026-01-19
Research·Computer Application
- “在航空散热薄壁蜂窝构件制造领域，专家提出了激光粉末床熔融超细光斑和工艺参数优化方法，直接成形了最小壁厚约100微米的薄壁蜂窝结构，为解决航空散热构件制造难题提供新方案。”摘要：Aming at integrated forming demand for aviation cooling thin-walled honeycomb components， the thin-walled honeycomb structure with a minimum wall thickness of ~100 μm was fabricated by LPBF ultrafine spot and optimized process parameters. Effects of laser beam size on the morphology and width of deposited single pass were investigated. The influence of process parameters （laser power and scanning spacing） with ultrafine laser beam on the density， molten pool morphology and dimensional accuracy of formed 316L components was analyzed. A mesoscale multiphase physical model of LPBF was established based on the finite volume method to reveal the influence law of laser scanning spacing on the temperature field， velocity field， residual pores， and surface quality of non-equilibrium molten pool in LPBF formed 316L alloy. The action mechanisms of temperature field， melt wetting and spreading， melt thermal capillary flow on fluctuation of free surface of molten pool and densification of overlap zone were clarified.关键词：Laser Powder Bed Fusion;Thermodynamics;316L Stainless Steel;Surface Morphology2|0|0更新时间：2026-01-19
- “在钛合金表面制备TiC陶瓷涂层领域取得新进展，专家采用正交试验法优化参数，显著提高涂层硬度和耐磨性能。”摘要：In order to prepare high-quality TiC ceramic coatings on the surface of titanium alloys and clarify the mapping relationship between cladding parameters and coating quality， an orthogonal design with three factors and three levels was carried out. The influence of laser power， scanning speed， and powder particle size on the thickness， flatness， and micro-hardness of TiC ceramic coatings was investigated by signal-to-noise ratio and variance analysis methods， and the microstructure and wear resistance of the coatings under optimal parameters were evaluated. The results indicate that the laser power and powder particle size have significant impact on the thickness and micro-hardness of coating. TiC ceramic coatings prepared by laser cladding under the optimal parameters （laser power of 800 W， scanning speed of 10 mm/s， particle size of 0.5 μm） exhibit a 77% increase in microhardness and a 37.5% increase in wear resistance compared with those of Ti-6Al-4V substrate. The worn mechanisms of coating is dominated by slight abrasive wear and oxidative wear.关键词：Laser Cladding;TiC Ceramic Coatings;Cladding Parameters;Microstructure;Wear Resistance2|0|0更新时间：2026-01-19
Research·Additive Manufacture
- “在材料科学领域，专家采用ProCAST软件模拟WC增强高铬铸铁基复合材料的温度场和应力场，发现三孔预制体对金属液缓流效果最佳，成功制备了WC/Fe基复合材料。”摘要：ProCAST software was utilized to simulate the temperature and stress fields of WC-reinforced high-chromium cast iron matrix composites with different amounts of prefabricated holes.The results indicate that different amounts of prefabricated holes lead to various stress distributions under sand gravity casting.The preform with three-hole structure has significant impact on the slow-flow of metal liquid， and stress reaches the minimum value， where the maximum flow rate is 1.561 m/s， and equivalent stress value is 655.8 MPa.Additionally， the temperature field and stress distribution are more uniform.The results reveal that WC/Fe matrix composites with excellent interfacial bonding are successful fabricated through casting experiment.关键词：WC/Fe Matrix Composites;Preform Holes;Temperature Field;Stress Field2|0|0更新时间：2026-01-19
- “在电磁感应加热领域，研究者采用有限元分析模拟2024铝合金半固态加热过程，优化电参数和线圈参数，显著提升坯料内部温度均匀性。”摘要：The finite element method was employed to simulate the internal temperature distribution of 2024 aluminum alloy during the semi-solid transformation induced by electromagnetic induction heating， and effects of electrical and coil parameters on magnetic field and heating process were investigated. The internal temperature uniformity of alloy at the end of heating as well as time required for heating was analyzed comparatively. The results indicate that the current frequency and the number of turns per coil have a significant positive correlation impact on magnetic field strength. The optimal electrical and coil parameters for SiCp-2024Al compound powder blocks with dimensions of ϕ80 mm×60 mm are determined as follows： Current frequency of 80 kHz， coil inner diameter of 130 mm， coil spacing of 2 mm， and turns per coil of 15 or 20， which exhibit own advantages. With the constant power， the temperature gradient between the blanks during the heating process remains basically stable. Through segmented heating， the internal temperature uniformity of billet is distinctly improved， and temperature gradient is reduced in a stepwise pattern， of which the variation node is consistent with power adjustment node. After segmental heating assisted with insulation treatment， the temperature gradient can be reduced within 2 ℃， significantly enhancing the temperature uniformity.关键词：Semi-solid;SiC/2024 Aluminum Matrix Composites;Simulation and Optimization2|0|0更新时间：2026-01-19
- “在异种铝合金焊接领域，研究者采用MIG工艺，通过多设备分析，发现焊接接头微观组织以α-Al相为基体，力学性能最佳时抗拉强度达195 MPa，硬度分析显示热影响区发生软化现象。”摘要：ZL114A and 6061-T6 dissimilar aluminum alloys were welded by MIG butt welding process with welding current of 112 A and welding voltage of 18.5 V. The microstructure and mechanical properties of welded joints were analyzed by optical microscope （OM）， scanning electron microscope （SEM）， X-r-ay diffraction （XRD）， microhardness tester and universal testing machine. The results indicate that α-Al phase is the matrix of welded joint， and Al-Mg and Al-Mg-Si precipitation are distributed in the matrix. With the welding speed of 340 mm/min， mechanical properties of welded joint are desirable， where the tensile strength is 195 MPa， and the fracture is characterized by plastic fracture.The hardness analysis reveals that the average hardness values at the heat-affected zone on both sides of the welded joint are lower than that of base metal， indicating softening phenomenon， and the minimum hardness appears in the HAZ on 6061-T6 side， which is 95% of base metal.关键词：ZL114A Alloy;6061-T6 Alloys;MIG Welding;Tensile Strength;Hardness2|0|0更新时间：2026-01-19
Research·Composites
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Effects of Different Distribution of Zn、Y on Properties of Mg Alloy Based on First-principles Study AI导读
“在材料科学领域，研究揭示了Zn和Y分布对镁合金性能的影响，发现Mg51Zn2Y-Ⅲ合金具有最佳延展性。”摘要：The effects of different distributions of Zn、Y on ideal tensile strength and ductility of magnesium alloys were investigated using first principles. The results mdicate that the stress of all Mg51Zn2Y （Ⅰ-Ⅳ） compounds reaches maximum value when the strain is around 0.20. The ideal tensile strength shows a ariation rule of first decreasing， then increasing， and finally decreasing with the increase of Zn、Y gather degree. The analysis results of state density and differential charge density reveal that the covalence of Mg-Y bonds varies with the distribution of Zn、Y atoms， leading to a change in the ideal tensile strength. The calculation results of Poisson's ratio， the ratio of bulk elastic modulus to shear modulus demonstrate that Mg51Zn2Y-Ⅲ exhibits desirable ductility.关键词：Mg Alloy;First-principles;Ideal Tensile Strength;Ductility2|0|0更新时间：2026-01-19 - “在半固态流变成形A357铝合金板焊接领域，研究了激光功率对焊接行为和熔池特征的影响，发现阳极氧化膜能提高熔深和硬度，为铝合金焊接提供新思路。”摘要：The laser welding behavior and molten pool characteristics of semi-solid forming A357 aluminum alloy plates with and without anodic oxide films under different laser power conditions were investigated. The results reveal that the welding mode is dominated by laser heat conduction welding at laser power of 1 kW. With the power increasing to 2 kW and 3 kW， the welding mode is gradually shifted to laser deep fusion welding， with a significant increase in depth and width of molten pool， while the interface height is decreased， and collapse occurs in the middle of weld seam. Anodic oxide film can enhance the absorption of laser energy， leading to an increase in melt depth， height， and width， with significant enhancement effect at lower powers， and diminishing at higher powers. High energy from the laser induces the loss of Mg and Fe elements， and the presence of oxide film along with higher power exacerbates the phenomenon. Anodic oxide film greatly affects the microstructure of molten pool. The grain orientation is randomly distributed， and the texture strength of melt pool in specimens with oxide film is slightly higher， with larger grain sizes and an ascending proportion of low-angle grain boundaries. As laser power rises， the porosity rate in weld seam is significantly decreased， which is higher in those with oxide film， and mainly concentrated in the upper-middle part. The hardness of the specimens without oxide film is slightly higher than that of those with oxide film， and the hardness of the former is reduced with increasing power， while the latter is increased， indicating narrowing difference of hardness.关键词：Semi-solid Forming;A357 Aluminum Alloy;Laser Welding;Anodic Oxidation2|0|0更新时间：2026-01-19
- “在材料科学领域，研究人员采用熔融复合盐净化处理Sn-Bi-Ag-Si系合金，显著提高了合金的抗拉强度和润湿性。”摘要：A molten composite salt of （mass fraction）0~50% NaCl + 30%～50% KCl + 10%～20% Na₃AlF₆ was utilized to purify Sn-Bi-Ag-Si alloy melt in the temperature range of 750～850 ℃， followed by quenching. The microstructure evolution and property variation of the alloy before and after salt purification were explored by scanning electron microscopy， energy dispersive spectrometer， differential scanning calorimeter， and electronic universal testing machine. The results indicate that the synergistic effect of molten salt purification and quenching can refine the coarse blocky Bi phase， leading to a 10% rise in tensile strength. Meanwhile， the wettability on Cu substrate is increased by nearly 40%.关键词：Low Temperature Lead-free Alloy;Sn-Bi Alloys;Molten Purification;Interfacial Reaction3|0|0更新时间：2026-01-19
- “在金属材料领域，研究人员采用中频感应熔炼技术制备Cu-Ni-Ti合金，并通过不同时效工艺处理，显著提升了合金的力学性能。”摘要：Cu-2.85Ni-0.48Ti alloy ingot was prepared by medium frequency induction melting， and the single-stage aging and two-stage aging treatment were carried out. The microstructure and mechanical properties of as-cast alloys and specimens after different aging treatments were characterized and tested， and the thermodynamic mechanism of precipitation was further analyzed. The results indicate that granular Ni3Ti and elliptical disc-like NiTi phases are observed in the as-cast alloy， which are transformed to rod-like Ni3Ti phases and a small amount of NiTi phase after single-stage aging. The quantities of precipitated phases are increased significantly with even distribution after two-stage aging. The yield strength and tensile strength of specimens after two-stage aging are increased by 93 MPa and 95 MPa than those of ones by single-stage aging， respectively， while the hardness is increased by 31 HV. A large number of precipitates effectively hinder the dislocation movement and improve the strength. Precipitation thermodynamic analysis reveals that high temperature pre-aging can increase the nucleation sites to promote the rapid precipitation of precipitated phases.关键词：Cu-Ni-Ti Alloy;Two-stage Aging;Microstructure;Precipitation Strengthening2|0|0更新时间：2026-01-19
- “在材料科学领域，研究人员采用真空非自耗钨极电弧熔炼技术制备了小尺寸高Nb含量的TiAl合金试样，并通过ANSYS软件研究了急冷快速凝固及不同退火条件下合金的显微组织和硬度变化。结果表明，快速凝固合金底部组织均匀细化，残余α相间存在条状B2相，α→α2+γ受到抑制，中部和顶部均存在凝固偏析。在退火温度为850℃时，随退火时间延长，试样底部组织更均匀细小，存在块状γ相（γm）和少量B2相，中部区域凝固偏析有所改善，而顶部偏析更为严重；经850℃×0.5h和850℃×1h退火处理后，试样中部和顶部B2相呈不连续的点状分布，而850℃×3h热处理后B2相以脉络状分布为主。急冷快速凝固合金的显微硬度偏高，且随退火时间延长，整体平均硬度呈上升趋势，但不同区域的显微硬度分布存在差异。”摘要：The small-sized specimens of high Nb-TiAl alloy was prepared by vacuum non-consumable tungsten arc melting. The microstructure evolution and microhardness variation of alloys after rapidly quenched solidification and heat treatment at 850 ℃ for different holding time were investigated by ANSYS. The results indicate that the microstructure at the bottom of quenched solidified specimens is refined uniformly， and strip B2 phase is observed between residual α phase. α→α2 + γ is inhibited， and solidification segregation exists in the middle and top regions. Under annealing temperature of 850 ℃， the microstructure at the bottom is more uniform and refined with the prolonging of annealing. Massive γ phase （γm） and a small amount of B2 phase appear， and the solidification segregation is improved in the middle zone， which becomes more serious in the top zone. After heat treatment at 850 ℃×0.5 h and 850 ℃×1 h， B2 phase in the middle and top zones presents discontinuous point-like distribution， which is mainly distributed in vein shape after heat treatment at 850 ℃ for 3 h. The microhardness of rapidly quenched solidified alloy is relative high， which is gradually increased with increasing in annealing time， while microhardness distribution are various in different regions.关键词：Cooling Rates;Solidification Segregation;Annealing Time;Microhardness;TiAl Alloy2|0|0更新时间：2026-01-19
Research·Alloy Performance
- “废旧汽车轮毂再生铝合金熔体处理技术研究取得进展，实现80%废铝添加量，满足高品质铸件生产要求，开发熔体质量评估平台，提高生产效率。”摘要：Taking recycled automotive wheel hubs as object， an efficient melt treatment technique was developed， and an effective melt quality evaluation method was established to achieve the melt quality of aluminum alloy containing 80% scraped aluminum equivalent to those of primary A356.2 alloy， meeting the quality requirements for aluminum alloy melt in the production of high-quality castings while achieveing rapid and accurate detection of melt quality. The results indicate that the alloy with 80% scraped aluminum can be thoroughly purified with the developed three-stage refining process by combining in-furnace refining， online rotary degassing， and dual-stage filtration with filter plates. Mechanical property test results reveal that the strength and elongation of 80% recycled A356 alloy hub at cores， spokes， and flanges are comparable to those of primary A356.2 aluminum alloy， where the yield strength， tensile strength， and elongation at wheel core reach （185±5） MPa， （245±5） MPa， and （5.0±0.5）%， respectively. Under a given Fe content， Fe containing phase can be transformed from β-AlFeSi to α-AlFeMnSi by modifying Mn/Fe mass ratio， thus reducing the adverse effects of β-AlFeSi phase on the performance. The established melt quality evaluation platform developed on the Python enables the real-time automated analysis of the melt characteristics including inclusion content， gas content， fluidity， and grain refinement to address the limitations of current manual evaluation methods， improving the production efficiency of industry production.关键词：A356 Alloy;Melt Treatment;Melt Quality Assessment;Mechanical Properties;Microstructure2|0|0更新时间：2026-01-19
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Thermal Deformation Behavior and Thermal Working Diagram of 7075 Aluminum Alloy Semi-solid Billet AI导读
“在铝合金加工领域，专家利用Gleeble-3500热模拟机对7075铝合金半固态坯料进行热压缩模拟试验，建立了引入参数Z的Arrhenius型本构方程，为半固态坯料加工提供解决方案。”摘要：The hot compression simulation of 7075 aluminum alloy semi-solid billet below sihidus temperature was conducted by Gleeble-3500 thermal simulator with deformation temperature of 250~450 ℃， strain rate of 0.001~10 s-1， and true strain of 1.2.The true stress-strain curves were modified by friction and temperature， and the Arrhenius type constitutive equation with parameter Z was established to plot the processing diagram.The results indicate that the semi-solid billet of 7075 aluminum alloy exhibits a positive strain rate. The peak stress predicted by constitutive equation is well consistant with actual peak stress， and the average peak stress is increased by 21.5% compared with that of as-cast alloy， which is decreased by 10% compared with that of homogeneous alloy.The optimal processing range is 350~450 ℃， 10-3~0.03 s-1， where the optimal range is wider than that of as-cast alloy， and the optimal temperature is higher than that of homogeneous alloy， and the optimal deformation rate tends to the low strain rate region.关键词：7075 Aluminum Alloy;Semi-solid Billet;Thermal Compression Simulation;Constitutive Equation;Hot Working Diagram2|0|0更新时间：2026-01-19 - “在三峡升船机主驱动齿轮修复领域，采用等离子熔覆技术，优化工艺参数，显著提高齿轮性能，为修复工作提供有效方案。”摘要：Aiming at surface cracks and wear of Three Gorges shiplifter main driving gear， plasma cladding technology was employed to repair surface with Ni60 alloy powder as cladding filler materials. Effects of process parameters including plasma cladding current and preheating temperature on microhardness， wear resistance， microstructure and properties of cladding layer were investigated. The results reveal that the optimal process parameters for plasma cladding are determined as preheating temperature of 150 ℃， cladding current of 120 A， ion gas flow rate of 3 L/min， argon gas flow rate of 9 L/min. On this condition， the average microhardness of cross section of cladding layer is increased by 35.1%， and the abrasion amount is reduced by 72.6% compared with that of substrate. The metallographic structure of cladding layer is desirable without cracks and porosities.关键词：Ni-based Alloy;Plasma Cladding;Process Parameters;Microstructure and Properties2|0|0更新时间：2026-01-19
- “在铝合金领域，研究人员采用Sr变质复合蛇形通道工艺处理Al-25Mg2Si合金，得到半固态浆料，初生Mg2Si相细化，共晶组织变质，为铝合金组织控制提供新思路。”摘要：Sr-modified serpentine channel composite process was applied to Al-25Mg2Si alloy to produce semi-solid Al-25Mg₂Si slurry， and the effects of composite process on the morphologies was investigated. The results indicate that primary Mg2Si phase is refined in the semi-solid Al-25Mg₂Si slurry obtained by 0.03% Sr modified and six-bend graphite serpentine channel process， and eutectic structure is transformed from coarse lamellar to fine lamellar or coral-like shapes. The rapid cooling and self-stirring effects of serpentine channel promote nucleation and growth of primary Mg₂Si phase， while released latent heat of crystallization facilitates the cooling rate during the eutectic transformation stage， refining the eutectic structure without altering the growth mode of Mg₂Si. Sr alters the growth mode of Mg₂Si phase through an impurity induced twinning （IIT） mechanism to achieve modification.关键词：Al-25Mg2Si;Sr Modification;Semi-solid Slurry15|0|0更新时间：2026-01-19
- “在7075高强铝合金领域，专家通过浸入式末端淬火和腐蚀试验，全面研究了其淬火敏感性，为提高材料性能提供解决方案。硬度随淬火端距离增大而降低，抗剥落腐蚀性能随端距增加而降低，晶内淬火析出相尺寸和数量增加，导致时效后强化相减少，力学性能下降。”摘要：Quench sensitivity of 7075 high-strength aluminum alloy was comprehensively investigated through immersion end-quenching tests， corrosion experiments， and microstructural analysis. The results indicate that the hardness is gradually decreased with increscent quenched end distance， which is declined by 48.7% at 145 mm from the end compared to that at 5 mm. The resistance to exfoliation corrosion deteriorates with greater end distance， and corrosion severity escalates over prolonged immersion time. As the distance rises from 5 mm to 145 mm， the corrosion rating shifts from PC to EB grade， and the maximum corrosion depth is increased from 43 μm to 135 μm. The quantities and sizes of intragranular quench-induced precipitates are significantly increased with greater end distances， leading to a reduction of strengthening phases after aging， thereby diminishing mechanical properties. Furthermore， grain-boundary precipitates are coarsened， acting as anodic phases with poor corrosion resistance， significantly compromising exfoliation corrosion performance.关键词：High-strength Aluminum Alloy;Quenching;Exfoliation Corrosion;Sensitivity3|0|0更新时间：2026-01-19
- “在架空输电用Al-Mg-Si合金线领域，专家系统研究了其疲劳性能演化及损伤机制，揭示了疲劳断口特征区比例的演化机制，为输电线路安全运行提供解决方案。”摘要：Taking Al-Mg-Si alloy wires for overhead power transmission as object， tensile-tensile fatigue tests under various stress levels were conducted to systematically investigate the evolution of fatigue performance and damage mechanisms， and fatigue fracture feature were characterized in macro and micro scale. The results indicate that the tensile strength and fatigue strength of Al-Mg-Si alloy wire are 292.0 MPa and 115.0 MPa， respectively， with a fatigue ratio of 0.39. The fatigue fracture is characterized by typical characteristic zones including fatigue initiation zone， planar crack propagation zone， inclined crack propagation zone， and transient fracture zone. Fatigue cracks mainly initiate from wire surface， and the proportion of planar crack propagation zone is increased with stress reduction， while the proportion of final fracture zone is decreased. Additionally， the proportion evolution mechanism of fatigue fracture characteristic zone was revealed， and a linear relationship between the maximum stress and the proportion of transient fracture zone was established. Meanwhile， the microhardness of Al-Mg-Si alloy wire is declined significantly under higher stress cyclic loading， compared to primary ones， presenting evident cyclic softening characteristic. TEM analysis indicates that dislocation recovery is the main reason for cyclic softening.关键词：Al-Mg-Si Alloy Wire;Fatigue;Fracture;Precipitates;Dislocation2|0|0更新时间：2026-01-19
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Effect of Water-cooled Rings on Thermally Controlled Solidification Process of Superalloy Casing AI导读
“在航空发动机机匣铸造领域，研究揭示了水冷环对热控凝固工艺影响，为优化水冷条件提供依据。”摘要：The thermally controlled solidification （TCS） process is critically important in the casting of aero-engine casings， however， the impact of water-cooling ring on the process needs further investigation. Numerical simulations were employed to compare conditions involving shell preheating， withdrawal solidification， and casting defects in the TCS process with and without the water-cooling ring. The results indicate that the preheating temperature of the shell is increased in absence of the water-cooling ring， while the average cooling rate of the casting during the withdrawal solidification stage is decreased， which leads to grain coarsening and a decline in mechanical properties. Conversely， shrinkage porosity defects are decreased， and relative density is improved. It is evident that the water-cooling ring has opposing effects on the solidification defects and mechanical properties of the casting. Therefore， optimal water-cooling conditions should be determined based on a comprehensive assessment of performance in actual production.关键词：Superalloy Casing;Thermally Controlled Solidification;Numerical Simulation;Water-cooled Ring2|0|0更新时间：2026-01-19
Research·Alloy Process
- “在汽车发动机前盖制造领域，专家优化模具结构，降低缩孔缺陷至2%以下，提升产品品质。”摘要：The structural characteristics and defect forms of the automobile engine front cover were described. The defect origination is attributed to difficulty in mold filling at the bracket area of the front cover， excessive local wall thickness， and the inability to effectively implement feeding during the cooling and solidification process， leading to shrinkage porosity. By optimizing the structure of core-pulling mechanism in the mold and designing large-capacity overflow grooves in areas with challenging filling and feeding conditions， the risk of shrinkage porosity was reduced. The design incorporates hydraulic core-pulling and hydraulically assisted mechanical locking mechanisms to ensure the reliability of core-pulling positioning and movement. Based on these mold optimizations， the localized shrinkage porosity defects in the product are reduced to below 2%. Validation through mass production confirms the stable quality of front cover products as well as smooth， reliable， and durable operation of molds.关键词：Engine Front Cover;Shrinkage Cavities;Die Casting Die;Optimization Design2|0|0更新时间：2026-01-19
- “在水泵壳体压铸成形领域，专家开发了新工艺并优化浇注系统，通过数值模拟分析减少缺陷，为压铸技术发展提供新方向。”摘要：A development and improvement process of die-casting water pump shell was conducted. For the structural characteristics of water pump shell and key region of sealing requirements， the initial design of gating system was carried out. According to theoretical calculation of process parameters， Magma software was utilized to analyze filling and solidification process. The gating system was optimized based on the simulated results to identify the location of theoretical defects and take measures in advance. According to the actual production problem points， defects could be reduced through altering gating system， cooling system and adding partial extrusion.关键词：Water Pump Shell;Die-Casting Process;Numerical Simulation;Local Squeezing0|0|0更新时间：2026-01-19
Application·Die Casting
- “在精密铸造K417G高温合金低压涡轮叶片领域，研究了尺寸变形规律，改进工艺，提高了叶片尺寸一致性，改善了叶片表面粘砂问题。”摘要：The working blades of a certain aircraft engine exhibit an ultra-thin and slender structure， which exists significant technical difficulties in blade forming， size control， and other aspects. Statistical analysis was conducted on the dimensional accuracy of investment casting K417G alloy blades， deformation degree and dimension tolerance of actual cast blades， and dimensional deformation law of investment cast blades was explored. Through improvement experiments， an effective control method was determined to improve the consistency of casting dimensions. By improving shell making process， the coating scheme test was verified， and sand sticking on the surface of blades was modified.关键词：Ultra-thin and Slender Working Blades;Deformation Control;Investment Casting2|0|0更新时间：2026-01-19
Application·Investment Casting
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