最新刊期
卷 45 ， 期 4 ， 2025
- “在材料科学领域，研究者通过实验分析了重熔时间对Al-8Si合金微观结构和力学性能的影响，发现重熔120分钟时合金性能最优。”摘要：Effects of remelting time on the microstructure and mechanical properties of thixoformed Al-8Si alloy were investigated by optical microscope， X-ray diffractometer， scanning microscope and universal experimental stretching machine. The results indicate that the microstructure of alloy is transformed significantly with the extension of remelting time. The shape of the primary phase particles in the semi-solid billet becomes more spheroidized with the size becoming slightly larger. The length-diameter ratio of eutectic Si phase is increased firstly and then decreased and the volume fraction is increased with sound distribution. The volume fraction of primary Si is increased firstly and then decreased， and the morphology is evolved from a small-sized polygon to large-sized polygon ， then to long strip， and finally back to polygonal. The tensile results reveal that with the increase of reheating time， the tensile strength of alloy is firstly increased and then decreased， and mechanical properties are optimal at 120 min， where the tensile strength， yield strength， hardness and elongation reach up to 187 MPa， 93 MPa， 75 HV and 17%， respectively. The desirable mechanical properties are mainly attributed to the enhancement of grain roundness， volume fraction reduction of primary silicon， and improvement of the size and morphology of eutectic silicon.关键词：Thixoforming;Al-8Si Alloy;Microstructure;Mechanical Properties189|293|0更新时间：2025-05-06
- “最新研究发现，CoCrW合金在Hanks平衡盐溶液中耐蚀性最佳，腐蚀电流密度和维钝电流密度最低，电荷转移电阻和钝化膜电阻之和最大。”摘要：The corrosion behavior of CoCrW alloy in Hank’s balanced saline solution （HBSS）， borate buffered saline （BBS）， phosphate buffered saline （PBS）， simulated body fluid （SBF） and artificial saliva （AS） solutions was investigated by potentiodynamic polarization tests， electrochemical impedance spectroscopy （EIS）， optical microscopy （OM）， scanning electron microscopy （SEM）， energy dispersive X-ray spectroscopy （EDS） and X-ray photoelectron spectroscopy （XPS）. In HBSS， the corrosion current density and passive current density reach the minimum value， which are 5.05×10-8 A/cm2 and 1.88×10-7 A/cm2， respectively. The spontaneous corrosion potential and the pitting potential are higher， which are -0.241 VSCE和0.424 VSCE， respectively. The arc radius and the sum of charge transfer resistance and passivation film resistance is the largest， and the latter is 6.00×106 Ω·cm2， leading to the optimal corrosion resistance. The corrosion resistance sequence of CoCrW alloy in the solutions is presented as follows： HBSS > BBS > PBS > SBF > AS. The corrosion products are dominated by Co（OH）2， Cr2O3， Cr（OH）2 and WO3.关键词：Co Alloy;Corrosion;Electrochemical Properties;Simulated Biological Environment Solutions51|5|0更新时间：2025-05-06
- 摘要：Al-Mg-Si-Mn-Cu-Zr die-cast aluminum alloys with different compositions were designed by phase diagram and thermodynamic calculation， and effects of mass ratio of Mg and Si as well as annealing heat treatment on microstructure and mechanical properties were investigated. The results indicate that the as-cast microstructure is mainly composed of α-Al matrix， Al6Mg4Cu， Mg2Si， Al6Mn， Al3Mg2 and Al3Zr phases. With the increase of Mg， Si mass ratio， the morphology of Al6Mg4Cu phase is transformed from discontinuous point to continuous network with increasing in content. Mg2Si phase displays a skeleton-like morphology， of which the size and content rise continuously. Morphology of Al6Mn phase is converted from spot and block to needle flake with increasing in content. The as-cast yield strength is raised continuously， while the tensile strength and elongation are decreased straightly， which are 170 MPa， 268.7 MPa and 5.8% at Mg， Si mass ratio of 6， respectively， and the fracture mechanism is charaterized by intergranular fracture. Discontinuous point-like Al6Mg4Cu phase is transformed into network Al2CuMg phase after annealing and heat preservation， while segregation occurrs under excessive preservation. The size of Mg2Si phase is decreased firstly and then increased with continuously rising content， while the morphology of Al6Mn phase remains needle-like. The tensile strength shows a continuous rise， while yield strength exhibits a slight reduction. The yield strength， tensile strength and elongation of alloy are 180.8 MPa， 310.4 MPa and 5.6%， respectively， after annealing at 455 ℃ for 20 h.关键词：Die-cast Al-Mg-Si-Mn-Cu-Zr Alloy;Thermodynamic Calculation;Phase Diagram;Microstructure;Mechanical Properties66|9|0更新时间：2025-05-06
Current Recommendation
- “在材料科学领域，专家建立了基于有限差分法的三维相场模型，模拟研究了Al-4.5Cu合金粒子快速凝固过程中的枝晶生长与组织演化行为，为制备微米级球形粒子提供解决方案。”摘要：Aiming at preparation process of micron spherical particles by POEM， a three-dimensional phase field model of binary alloy dendrite growth was established based on the finite difference method to investigate the dendrite growth， morphology evolution and solute segregation of micron-sized spherical particles during the rapid solidification. The reasults reveal that the secondary dendrite arm spacing （SDAS） of simulated microspheres with 400 μm is about 20.95 μm， which deviates from the experimental results by less than 5%. For microspheres with particle size of 300 μm， dendrite segregation can be promoted by increasing the supercooling degree. With the dimensionless supercooling degree increased from 0.2 to 0.4， the solute concentration at the dendrite tip rises from 5.03% to 5.21%. The cooling capacity of the inert protective gas significantly affects the growth rate of microsphere dendrites. The droplets with helium and argon as cooling media exhibit a dendrite length difference of 8 μm at t=40 000Δt， which is increased to 23 μm at t=50 000Δt.关键词：Alloy Microspheres;Phase Field Method;Dendrite Growth;Numerical Simulation;POEM51|4|0更新时间：2025-05-06
Experimental Investigation
- “在航空航天和交通运载领域，7xxx系高强铝合金增材制造技术研究取得新进展，为材料性能优化提供新思路。”摘要：The high-strength 7xxx series aluminum alloys such as Al-Zn-Mg and Al-Zn-Mg-Cu alloys are crucial structural materials in the aerospace and transportation fields， which is one of the important research and development directions of additive manufacturing processes. The additive manufacturing processes were categorized by heat sources， and precipitate phases in additive manufactured 7xxx series aluminum alloys prepared with different processes were summarized， and the precipitate phase compositions and orientation relationships with the matrix were analyzed. Finally， the effects of precipitate phases on the mechanical properties of alloys were also described.关键词：Additive Manufacturing;7xxx Series Aluminum Alloys;Precipitate Phase;Mechanical Properties63|11|0更新时间：2025-05-06
Research·Review
- 摘要：Laser cladding WC/Co composite powders were fabricated on high-speed steel surface. The microstructure， phase composition， microhardness and wear resistance of cladding layer were analyzed and characterized by metallographic microscopy， scanning electron microscopy， X-ray diffraction and friction and wear testing machine. The results indicate that with the laser power of 1.5 kW， powder feeding speed of 20 g/min， scanning speed of 1.5 mm/s， and bonding rate of 45%， the cladding layer is mainly composed of WC and M6C compounds， including WC， W2C， Fe2W2C， Fe3W3C， Co3W3C， （Cr，Fe）7C3 and other complex phases. Absence of obvious pores and cracks could be observed， and well bonding with the substrate was achieved. The hardness of the cladding layer is much higher than that of high-speed steel， and the maximum hardness reaches up to 1 439 HV0.2， which is about 1.65 times of that of high-speed steel， and the wear resistance is twice of that of high-speed steel. The wear mechanism is dominated by abrasire wear.关键词：Laser Cladding;High-speed Steel;WC/Co Powder;Microhardness;Wear Mechanism34|4|0更新时间：2025-05-06
- “在选区激光熔化TC4合金孔缺陷识别领域，基于OpenCV的图像预处理、识别与框选方法，研究了孔缺陷形貌特征值与尺度的统计学分布，为缺陷分析提供解决方案。”摘要：To achieve the identification and analysis of pore defects in SLM-formed TC4 alloy， image preprocessing， recognition， and selection methods were selected based on OpenCV to investigate morphological characteristic values of pore defects in the formed parts as well as the statistical distribution of scales. The accuracy of identification information was verified by comparing with manual analysis results. The results indicate that the circularity， convexity， and elongation of defects follow the Weibull function distribution. Defects with circularity greater than 0.7， convexity greater than 0.9， and elongation less than 0.4 account for 79.8%， 93.4%， and 92.9%， respectively. Small and medium-sized defects account for 96.9%， while large defects account for 3.1%. Among the formed parts， small to medium-sized defects with high circularity and convexity and low elongation are more prevalent.关键词：OpenCV;SLM;TC4 Alloy;Defect Identification;Statistical Analysis393|6|0更新时间：2025-05-06
Research·Additive Manufacture
- “在压力铸造领域，专家利用SPH-FEM耦合程序模拟支架流动场、温度场和凝固场，预测铸件缩松缺陷，计算准确可靠。”摘要：The Smoothed Particle Hydrodynamics （SPH） method was employed to calculate the flow field， temperature field， and solidification field of a bracket during pressure casting. The self-developed SPH program incorporated the Niyama criterion to predict shrinkage defects in the casting， and further comparison and validation were conducted using ProCAST simulation software. Additionally， a self-writtened finite element method （FEM） program was utilized to calculate the stress field during solidification process. Considering that the bracket undergoes solidification under pressure conditions， the impact on temperature enhances the accuracy of shrinkage calculation results obtained from SPH program. The results reveals that shrinkage defects are mainly distributed in thicker central regions of castings as well as edges adjacent to thinner dies，which suffers less stress and insufficient feeding due to resistance encountered by molten metal. The findings demonstrate that the numerical simulation approach based on SPH-FEM coupling for pressure casting process is accurate with reliable operation.关键词：Pressure Casting;SPH;Finite Element Method;Shrinkage Defects;Numerical Simulation384|2|0更新时间：2025-05-06
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Orthogonal Optimization and Simulation of Low-pressure Casting Process for Magnesium Alloy Casing AI导读
“在镁合金薄壁机匣低压铸造领域，专家设计了底注式和缝隙式结合的浇注系统，通过ProCAST模拟软件优化了浇注温度、砂型预热温度和保压压力，实现了铸件品质提升。”摘要：In order to improve comprehensive quality of magnesium alloy with thin-walled casing by low-pressure casting， gating system combined with bottom injection and slit type was designed. Based on the ProCAST software， orthogonal experiment with three factors and four levels were designed with pouring temperature， preheating temperature of sand mold and holding pressure as objects， filling and solidification processes were numerically simulated by optimal process parameters. The results indicate that with the increase of pouring temperature and preheating temperature of sand mold， solidification time of casing casting is prolonged obviously， and the volume of shrinkage and porosities is reduced gradually. Under the optimum process parameters， with pouring temperature of 730 °C， preheating temperature of sand mold of 25 °C and holding pressure of 37 kPa， the filling process of magnesium alloy casing casting presents stable. The distribution of solid fraction in solidification stage is reasonable， and the shrinkage cavity and porosity are distributed inside the riser. The reliability of the parameters was verified by experiment.关键词：Magnesium Alloy;Low Pressure Casting;Numerical Simulation;Orthogonal Experiment33|7|0更新时间：2025-05-06 -
First-principle Calculations of Interfacial Properties and Wettability of WC/Cu and W/Cu Composites AI导读
“在材料科学领域，研究者通过第一性原理计算，对比分析了WC/Cu和W/Cu复合材料的界面结合强度及润湿性，发现WC/Cu界面结构更稳定，润湿性更好，电子结构分析也证实了其更强的界面结合能力。”摘要：Interface energy， interface adhesion work， wetting angle， elastic modulus and electronic structure of WC/Cu and W/Cu systems were calculated by first principles， and the interface bonding strength and interface wettability of WC/Cu and W/Cu composites during infiltration preparation were theoretically analyzed. The results reveal that the W-termination of WC （0001）/Cu （111） exhibits the minimum interface energy， and the interface structure of WC/Cu is more stable than that of W/Cu. The interface adhesion work of WC （0001）/Cu （111） is greater than that of W（110）/Cu （111）， indicating the advantage of interface bonding of WC/Cu. The wetting angles of C-termination and W-termination of WC/Cu are 13° and 19°， respectively， which are much lower than of the W/Cu （53°）， proving desirable wettability of Cu on WC surface. The elastic moduli of WC/Cu and W/Cu are between Cu and WC or Cu and W， with Poisson’s ratios greater than 0.26， demonstrating prior enhancement effect of WC on Cu. In view of electronic structure， the interfacial bonding ability of WC/Cu composites is superior to that of W/Cu composites.关键词：Cu Matrix Composites;Interface Bonding;Wettability;First Principles23|10|0更新时间：2025-05-06
Research·Computer Application
- “在材料科学领域，研究揭示了不同包覆层Al熔体温度对2024/Al双金属铸锭界面组织与性能的影响，为双金属铸锭复合界面的纯净、无缺陷的冶金结合提供解决方案。”摘要：The influence of varied cladding layer Al melt temperatures on interfacial structure and properties of 2024/Al bimetal ingots was investigated， and the compound mechanism of 2024 aluminum alloy semi-solid slurry with pure Al melt was explored. The results indicate that the semi-solid/liquid composite method can achieve pure-cleaness and defect-free metallurgical bonding at the compound interface of 2024/Al bimetallic ingots. As pure Al melt temperature of cladding layer rises， the average grain size at the composite interface is gradually decreased， and the liquid phase equiaxed crystal area and width of compound interface is increased accordingly， while the element diffusion distance is gradually raised， and the element distribution tends to be uniform. The average microhardness at the interface is gradually enhanced， and the microhardness difference between interface and core alloy or cladding alloy is gradually elevated， presenting a weakened sensitivity of microhardness to grain size . The formation mechanism of metallurgical bonding interface between cladding pure Al melt and 2024 aluminum alloy semi-solid slurry is dominated by melt convection and supplemented by high-temperature diffusion.关键词：Bimetal Composite;Compound Casting;Aluminum Alloy;Interfacial Microstructure29|2|0更新时间：2025-05-06
Research·Composites
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Effects of Electrolyte Temperature on Structure and Properties of 5 μm Electrolytic Copper Foil AI导读
“最新研究揭示，电解液温度对5微米电解铜箔结构和性能有显著影响。在50℃时，铜箔晶面取向系数最大，力学性能优异，表面粗糙度低，镀层致密平整。”摘要：The effects of electrolyte temperature on structure and properties of 5 μm electrolytic copper foil were investigated by X-ray diffraction （XRD）， scanning electron microscopy （SEM） and cyclic voltammetry （CV） test. The results indicate that the orientation coefficients of （111） and （220） crystal surfaces in 5 μm electrolytic copper foil are increased firstly and then decreased， which are consistent with the variation of tensile strength and elongation. Meanwhile， the surface roughness of copper foil is decreased firstly and then increased with the increase of electrolyte temperature. The cyclic voltammetry test results reveal that the precipitation of Cu2+ is reduced with the decrease of electtrolyte temperature. The （111） and （220） crystal surface orientation of 5 μm electrolytic copper foil reaches the maximum value at 50 ℃ and exhibits excellent mechanical properties， where the tensile strength reaches 530.67 MPa and the elongation is 3.22%. In addition， the roughness of S and M surfaces are 1.83 μm and 1.76 μm， respectively， and the coating surface is compact and smooth.关键词：Electrolytic Cu Foil;Microstructure;Properites10|1|0更新时间：2025-05-06 - “在铝合金热变形领域，专家基于Arrhenius双曲正弦本构模型建立了6A01铝合金的本构方程及热加工图，为解决合金热加工问题提供解决方案。”摘要：Effects of deformation temperatures and strain rates on the thermal deformation behavior of 6A01 alloy were investiagted by isothermal thermal compression experiments. Based on the Arrhenius hyperbolic sinusoidal constitutive model and dynamic material model， the constitutive equation and thermal processing diagram of 6A01 aluminum alloy were established. The results indicate that the rheological stress of 6A01 aluminum alloy is decreased with the increase of deformation temperature and increased with the increase of strain rate. After hot compression deformation， the structure of 6A01 aluminum alloy is transformed from the equiaxed grain structure to elongated deformation structure， and a small amount of dynamic recrystallization structure is distributed in the grain boundary. The dynamic recrystallization fraction is increased with the increase of temperature and decreased with the increase of strain rate. The calculation results reveal that the deformation activation energy of alloy is 180.344 kJ/mol， and optimum hot working range of 6A01 alloy is deformation temperature of 485~515 ℃ and strain rate of 0.01~0.1 s-1.关键词：6A01 Aluminum Alloy;Hot Deformation;Constitutive Equation;Hot Working Diagram13|4|0更新时间：2025-05-06
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Effects of Extrusion Temperature on Microstructure and Properties of 6061 Chip-based Extrudates AI导读
“在铝合金回收领域，研究了热挤压工艺对6061铝合金切屑的影响，发现最佳挤压温度为425℃。”摘要：Hot extrusion process was utlized to recycle 6061 aluminum alloy chips. The influence of extrusion temperature on microstructure and properties of extrudates was investigated. The results indicate that under the fixed extrusion ratio of 14.1， the broken degree of chip oxide layer is gradually increased with the increase of extrusion temperature， meanwhile the metallurgical bonding among chips is gradually enhanced， and the tensile strength of the alloy chips is gradually increased， reaching a peak value of 188 MPa at 425 ℃. As the temperature rises， the density of geometrically necessary dislocation is gradually decreased due to the enhancement of recrystallization degree， and the tensile strength is gradually declined. The optimuou extrusion temperature of 425 ℃ was obtained among the experimental parameters.关键词：6061 Aluminium Alloy;Chips;Hot Extrusion;Microstructure;Mechanical Properties19|6|0更新时间：2025-05-06 - “在材料科学领域，研究人员采用受控扩散凝固法制备Al-Si合金，发现母合金混合比对混合效果有显著影响，母合金纯Al比例为33.3%时，金属型凝固组织形核率最高。”摘要：Al-Si alloys were prepared by Controlled Diffusion Solidification （CDS） method with pure Al （precursor alloy 1） and Al-12Si （precursor alloy 2） in different proportions. The temperature， solute fields and nucleation rate of mixed melt， as well as the grain size and morphology of castings obtained from experiments were analyzed by combination of numerical simulation and experimental validation. The results indicate that the effect of precursor alloy blending is contingent upon the mass difference. With the greater mass difference， the temperature field is more homogeneous and soloute field is hetergeneous， and desirable mixing effect is achieved with mixing ratio of 1∶2. With a 33.3% proportion of pure Al in the precursor alloy， the nucleation rate of metallic solidified structure reaches the maximum value， where the grain size and shape factor reach 51.98 μm and 1.39， respectively. Phenomena such as grain consolidation， coarsening or nucleation rate reduction occurr since proportion deviates from 33.3%.关键词：Controlled Diffusion Solidification （CDS）;Al-Si Alloy;Mixing Ratio;Nucleation Rate;Solidified Microstructure16|2|0更新时间：2025-05-06
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Design and Optimization of Permanent Mold Gravity Casting Process of Aluminum Alloy Brake Calipers AI导读
“在汽车制动钳铸件制造领域，专家利用CATIA和MAGMA软件进行三维建模和工艺优化，成功消除缩松缩孔缺陷，提升产品质量。”摘要：A three-dimensional modeling of the casting was conducted using CATIA software based on the structural characteristics of the brake caliper casting， and casting process was designed. The process scheme was further optimized using MAGMA software to analyze the temperature field during the filling and solidification process of the casting as well as the distribution and size of shrinkage and porosity defects. On this basis， optimization design was carried out by adjusting process parameters and adding cooling measures. The results reveal that the optimized brake caliper casting has absence of shrinkage or porosity defects， thereby improving the product quality of the casting. The feasibility of optimization process was verified through production trials.关键词：Brake Caliper;Permanent Mold Gravity Casting;Numerical Simulation;Process Optimization41|13|0更新时间：2025-05-06 - “镁合金板材卷取矫直工艺研究取得进展，提高弯曲温度可降低断裂应力，提高极限弯曲挠度，为镁合金板材生产提供解决方案。”摘要：For the coiling and straightening process of sheets in the production process of magnesium alloy sheets， influence of bending temperature， including 100， 150， 200 and 250 ℃， on the microstructure and bending properties of AZ80 rolling medium-thick plate was investigated. The results reveal that with increase in the bending temperature， the fracture stress of AZ80 rolled plate is declined and ultimate bending deflection is improved. The bending temperature can affect the deformation mechanism of AZ80 rolled plates， with slip and ｛101-2｝ twins dominating the deformation in bending at 100 ℃， and slip dominating the deformation in bending at 150， 200 and 250 ℃. In addition， the microstructure analysis reveals that the deformation in the tension zone is higher than that of ones in the compression zone， and the tension zone is more likely to become a source of crack nucleation and cause plate fracture.关键词：AZ80 Magnesium Alloy;Bending Temperature;Microstructure;Bending Properties15|2|0更新时间：2025-05-06
- “在镁合金领域，研究者对Mg-6Gd-3Y-0.5Zn-0.5Zr合金进行了组织和力学性能研究，发现时效处理后合金强度显著提高，断裂方式为韧-脆混合型。”摘要：The microstructure and mechanical properties of Mg-6Gd-3Y-0.5Zn-0.5Zr alloy in as-cast， solid solution and aging state were investigated by low pressure sand mold casting process. The results indicate that the coarse Mg24（Gd， Y， Zn）5 and Mg5（Gd， Y， Zn） eutectic phases in the alloy are dissolved after heat treatment， and the nanometer β' phase and LPSO phase can be observed. The strength of the alloy is improved， and the tensile strength， yield strength， and elongation of the alloy reach up to 318.7 MPa， 219.8 MPa and 6.25%， respectively， which is attributed to the large number of fine and uniform secondary phase formed after aging treatment， which can effectively pin and strengthen the grain boundary and hinder dislocation movement during the deformation process， improving the strength of the alloy. In addition， the fracture modes of as-cast， solid solution and aging alloys are characterized by ductile-brittle modes.关键词：Magnesium Alloy;Sand Casting;Low-pressure Casting;Heat Treatment;Microstructure;Mechanical Properties21|5|0更新时间：2025-05-06
- “在铸造Al-Si-Cu-Mg合金领域，研究者借助CALPHAD软件优化固溶工艺，提升合金力学性能，为热处理工艺设计提供新方法。”摘要：Aiming to optimize the solid solution process of casting Al-Si-Cu-Mg alloy with CALPHAD technology and improve mechanical properties，the chemical composition of alloy was tested by QSN750 direct reading spectrometer. The solidus temperature of alloy， formation temperature of Al₅Cu₂Mg₈ phase and homogenization heat treatment time were calculated based on CALPHAD software， and the experiment was verified. The results indicate that the calculated solidus temperature of alloy， formation temperature of Al₅Cu₂Mg₈Si₆ phase and optimal solution time are 535 ℃， 530 ℃， and 10 h， respectively. After 530 ℃×10 h solution +150 ℃×10 h aging treatment， the tensile strength， yield strength and elongation of the alloy reach 415 MPa， 319 MPa， and 7%， respectively. The traditional test-adjustment-retest heat treatment process design method was changed， and the fast and accurate setting of solid solution process was realized with the help of CALPHAD technology， providing a new method for the heat treatment process design of cast Al-Si-Cu-Mg alloy.关键词：CALPHAD;Al-9Si-2Cu-0.5Mg;Solid Solution Treatment14|7|0更新时间：2025-05-06
Research·Alloy Process
- “在铝合金领域，研究人员通过不同固溶工艺研究AS14合金的组织和性能，发现双步固溶处理能提高合金的抗拉强度。”摘要：The microstructure evolution and mechanical properties of hypereutectic heat-resistant Al-14Si-3Cu-1Ni-0.5Mg-0.5Mn-0.3RE alloy （referred to as AS14 alloy） under different single-step and double-step solution processes were investigated through characterization methods such as OM， SEM， EDS and tensile testing. The results indicate that with the increase of solution temperature during the single-step solution + aging treatment， the edges of primary Si in the alloy is gradually passivated， eutectic Si is gradually melted into nearly spherical or granular shapes， and intermetallic compounds are gradually broken into small or granular shapes. When the single-step solution temperature is 510 ℃， the tensile strength at room or elevated temperature and room temperature elongation of AS14 alloy are desirable. After double-step solution and aging treatment， the size of Si phase in the alloy is smaller with more regular shape， and the fragmentation of intermetallic compounds is more obvious. Compared with single-step solution + aging treatment， the tensile strength of AS14 alloy at room and elevated temperature is increased slightly to 364.7 MPa and 189.6 MPa， respectively.关键词：Hypereutectic Al-Si Alloy;Solution Treatment;Microstructure;Mechanical Properties26|8|0更新时间：2025-05-06
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Microstructure and Properties of Novel Ti-Nb-Co-Cr-Al Series Alloy with High Strength and Toughness AI导读
“在航空、航天、航海等领域，针对重大装备对高强度、高塑性铸造钛合金的需求，研究了Ti-Nb-Co-Cr-Al系钛合金成分、组织及性能。通过合理匹配Nb、Co、Cr、Al元素含量，优化设计出新型高强度、高塑性铸造β钛合金Ti-23Nb-6.7Co-5Cr-4Al，其铸态条件下的室温抗拉强度达1097±8 MPa，伸长率可达19%±2%，展现了优异的强塑性匹配。”摘要：In response to the urgent demand for high-strength and high-plasticity cast titanium alloys in aviation， aerospace， and marine applications， the composition， structure and properties of Ti-Nb-Co-Cr-Al series titanium alloy were investigated. The results indicate that Nb addition leads to Nb-rich β-Ti matrix in the alloy， which ensures the plasticity. Co can effectively enhance the strength of titanium alloy in the system. By means of optimizing Nb， Co， Cr， and Al content， a novel cast β titanium alloy with high-strength and high-plasticity was designed， which is Ti-23Nb-6.7Co-5Cr-4Al. The room temperature tensile strength of as-cast alloy reaches （1 097±8 ）MPa， with an elongation of 19% ±2%， presenting superior strength-plasticity matching.关键词：Titanium Alloy;High Strength;High Plasticity;Microstructure and Properties15|2|0更新时间：2025-05-06 - “在Al-Mg-Si合金领域，专家研究了微量Fe的影响，提出添加适量Si消除Fe不利影响的策略，为合金性能优化提供新思路。”摘要：Effects of trace Fe on microstructure， conductivity and mechanical properties of Al-Mg-Si alloy were investigated， and the action mechanism of trace Fe element was clarified. On this basis， a strategy for eliminating adverse effects of Fe element by adding an appropriate amount of Si was proposed. The results reveal that trace Fe has little effect on the strength of Al-Mg-Si alloy， which reduces the elongation and electric conductivity. The presence of Fe promotes the formation of AlFeSi phase during the solidification of Al-Mg-Si alloy， enhancing the solid solubility of Mg in α-Al matrix. With 0.06%Si addition into Al-0.6Mg-0.35Si-0.1Fe alloy， the yield strength， tensile strength， elongation and conductivity of the alloy at peak aging state are increased from 182 MPa， 200 MPa， 11.75% and 33.23 MS/m to 195.33 MPa， 216 MPa， 13% and 33.72 MS/m， respectively.关键词：Al-Mg-Si Alloy;Trace Fe;Mechanical Properties;Electrical Conductivity20|5|0更新时间：2025-05-06
Research·Alloy Performance
- 摘要：In order to improve the forming quality of the low-pressure cast aluminum alloy rear subframe， ProCAST software was used to numerically simulate the filling and solidification processes during the casting process. Based on the situation of the molten metal during the casting process， temperature field variation， and the distribution of shrinkage porosity defects， a new gating system combining bottom and side gating was designed， and a cooling system was added to optimize the process parameters. The results reveal that the rear subframe castings produced by optimized parameters is free of shrinkage and porosity defects inside， and the secondary dendrite arm spacing is reduced from 42.10 μm to 37.53 μm. The mechanical properties are improved slightly. Finally， the feasibility of the scheme was verified through trial production.关键词：Rear Subframe;Low-pressure Casting;Numerical Simulation;Process Optimization49|12|0更新时间：2025-05-06
- “在铝铸主轴承盖件镶嵌轴瓦领域，专家通过调整模具温度、轴瓦温度和压铸工艺参数，解决了铝铁分离问题，使合格率达到99.5%。”摘要：In order to ensure the rigidity， the aluminum cast main bearing cover was inlaid with the bearing shell， and the gap separation phenomenon occurs at the joint of the aluminum iron inlaid after machining. Through adjustment and optimization of die temperature for main bearing cover and bearing bush as well as die casting parameters， the key affecting factors were determined. The aluminum-iron separation of main bearing cover was eliminated， and the qualified rate of batches of production reaches up to 99.5%.关键词：Al-Fe Separation;Main Bearing Cover;Die Casting15|5|0更新时间：2025-05-06
Application·Die Casting
- “在车用IN713C涡轮熔模铸造领域，专家模拟分析了涡轮热裂倾向，为降低热裂缺陷提供解决方案。”摘要：The investment casting process of IN713C automobile turbine was simulated， and the hot tearing tendency of turbine was predicted by analyzing structure， solidification sequence and stress distribution. The influence of different pouring process parameters on hot tearing tendency was investigated. The results indicate that the hot tearing defect is concentrated at the blade margin of turbine， which is reduced with the increase of mold shell temperature， and increased firstly and then decreased with the increase of pouring temperature. The simulation results are consistent with the actual pouring specimens.关键词：Charging Turbine;IN713C Alloy;Hot Tearing;Investment Casting;Numerical Simulation23|4|0更新时间：2025-05-06
- “在蜡模成型领域，专家采用Moldflow软件进行数值模拟，优化蜡模表面质量，为提升蜡模充型质量提供新方案。”摘要：Based on the thermal properties， rheological properties and melt compressible PVT characteristics testing of KC-2656L wax， numerical simulation of the wax molding process of single-ring multi-branch plate wax molding was carried out by Moldflow software. The results reveal that the wax melt confluence matches with the location of fusion marks appearing in the actual injected wax mold under the same process parameters， which verifies the accuracy of the numerical simulation results. By increasing the wax injection rate， the filling time of the wax mold is reduced by 37.5% and 54.5%， and the temperature distribution along the flow front of the wax mold presents more uniform. Meanwhile， the freezing layer factor at the end of the filler is reduced to decrease the resistance of the wax melt flow and optimize the flow pattern on the surface of the wax mold and the fusion mark at the melt confluence， improving the surface quality of the wax mold. The wax optimization scheme with double injection was designed， and the numerical simulation results reveal that it is more beneficial to improving the filling quality of the wax mold.关键词：Wax Pattern;Investment Casting;Numerical Simulation;Filling Process20|3|0更新时间：2025-05-06
Application·Investment Casting
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