最新刊期
卷 46 ， 期 2 ， 2026
- “介绍了其在4H-SiC晶体生长领域的研究进展，专家通过调整籽晶转速优化溶液流动状态和温度分布，为提高大尺寸晶体生长速度提供解决方案。”摘要：The flow state and temperature distribution were optimized by adjusting rotation speed of seed crystal to enhance growth rate of large-sized （6-inch） SiC crystals by top-seeded solution growth （TSSG） method. A two-dimensional axisymmetric model was established using COMSOL software to simulate the flow and temperature fields during the growth of large-sized SiC crystals as well as impact on rotation speed of seed crystal. The results indicate that the solution flow direction is converted from “anticlockwise” to “counterclockwise” with the increase of seed rotation， and the temperature gradient at the growth interface is increased， thus enhancing the growth rate of SiC crystals. With rotation speeds below 15 r/min， multiple disturbed vortices exist in the solution， resulting in a relatively uneven radial temperature distribution， which is detrimental to the stable growth of large-sized crystals. With rotation speeds ranging from 15 to 200 r/min， a stable and intense clockwise vortex is generated in the solution with the increase of seed rotation， ensuring stable transport of carbon solute， which facilitates the rapid growth of large-sized crystals. Under rotation speed of 30 r/min， the growth rate of SiC crystals is relatively low with smooth surface. Under rotation speed of 100 r/min， the growth rate is increased， while severe step bunching phenomena and solvent impurities are observed.关键词：Top-seeded Solution Growth （TSSG）;SiC;Flow Field;Temperature Field;Finite Element Analysis2|0|0更新时间：2026-02-14
Current Recommendation
- “采用模流仿真技术，专家系统研究了模具温度、浇注温度和浇注速度等工艺参数对阳极铜模铸造质量的影响，以及冷铁对改善阳极铜模微观组织的作用。结果表明，应力集中主要分布在特定区域，缩孔主要出现在浇口下方，而铜模整体形变量较小且具有对称性。采用寻得的全优参数条件浇注的阳极铜模缩孔体积减小了35.79%，最大铸造应力降低了1 000 MPa，冷铁加入区域柱状晶粒尺寸减小了40.29%，铜模模面的顶杆孔等区域的冷隔缺陷得到改善。”摘要：The influence of process parameters including mold temperature， pouring temperature， and pouring speed on casting quality and the role of chill iron in modifying the microstructure of anode copper molds were systematically investigated using mold flow simulation technology. The results reveal that stress concentration is primarily distributed in specific areas， and cavities mainly occur below the pouring gate， while overall deformation amount of the copper mold is relatively less and symmetrical. The volume of shrinkage cavities in the anode copper mold is decreased by 35.79% by adopting identified optimal parameter conditions，where the maximum casting stress is reduced by 1 000 MPa， and the size of columnar grains in the area with chill iron addition is decreased by 40.29%， indicating the well modification of cold shut defects in ejector pin hole areas on the mold surface of copper mold.关键词：Anode Copper Mold;Mold Flow Simulation;Pouring Parameters;Chill Iron;Grain Structure2|0|0更新时间：2026-02-14
- “介绍了其在铝合金薄壁壳体制造领域的研究进展，专家优化了挤压铸造工艺参数，为解决铸件缩松缩孔及二次枝晶臂间距问题提供了有效方案。”摘要：Taking a complex aluminum alloy thin-walled shell as object， the squeeze casting process parameters were optimized to solve shrinkage porosities and cavities as well as secondary dendrite arm spacing. After the preliminary optimization of pouring system and cooling system， Taguchi test design and signal-to-noise ratio analysis method were employed to investigate the effects of pouring temperature， punch speed and mold preheating temperature on shrinkage porosities and cavities as well as secondary dendrite of squeezing castings. Based on simulation analysis results， the optimal process plan was determined as pouring temperature of 700 ℃， punch speed of 0.04 m/s， and mold preheating temperature of 220 ℃ by comparing multiple process parameters. Compared with primary process schemes， the volume of shrinkage porosities and cavities of optimized casting are reduced by 89.9%， and the maximum secondary dendrite spacing is declined by 10.6%， meeting the expected requirements of process optimization.关键词：Aluminum Alloy Thin-walled Shell;Squeezing Casting;Taguchi Test Method;Numerical Simulation;Process Optimization2|0|0更新时间：2026-02-14
- “介绍了其在3D打印砂型领域的研究进展，专家基于响应面法对砂型空间网格进行优化，确定了网格形状、尺寸及间隙尺寸的最佳水平范围，为提高砂型抗压强度提供了优化工艺条件。”摘要：The spatial lattice of the sand mold was optimized based on response surface method（RSA） with the hole structure， gap size， and structural size as influencing factors and compressive strength as response value. Single-factor experiments were conducted to determine the range of each factor， and the experiments were optimized. The optimal process conditions for the compressive strength of sand mold were obtained as lattice shape of circular， lattice size of 3.7 mm， and lattice gap size of 4.1 mm. On the condition， the compressive strength of 3D printed sand mold reaches the maximum value of 3.832 MPa， which approaches the predicted value.关键词：Sand 3D Printing;Response Surface Method;Compressive Strength;Spatial Lattice;Process Optimization4|0|0更新时间：2026-02-14
- “介绍了其在铸件检索领域的研究进展，相关专家提出复杂铸件多特征检索算法，为解决人工检索效率低、机器检索多维量化难等问题提供解决方案。”摘要：In view of poor effect and low efficiency of manual retrieval for similar castings， as well as difficulty in multi-dimensional quantitative representation and multi-feature fusion retrieval for machine retrieval， a multi-feature retrieval algorithm for complex castings for process reuse was proposed. An operator representation capability evaluation method based on sensitivity and robustness was employed to screen suitable feature operators， and three-dimensional model was characterized from casting wall thickness， volume， envelope size， and symmetry surface. Meanwhile， a multi-feature fusion retrieval algorithm based on parallel adaptive particle swarm-genetic algorithm was put forward to modify particle swarm algorithm from aspects of algorithm parameters， population structure， and optimization strategy， and optimal weight coefficient solution was obtained to achieve multi-feature fusion retrieval. Finally， retrieval experiments and workshop verification were carried out. The results indicate that the algorithm performs well on multiple retrieval data sets. Similar castings are retrieved and mature processes is reused in HL company， which reduces the process design difficulty in pouring position， parting surface， and pouring riser， and the time consumption is reduced by 20%～35%.关键词：3D Model Retrieval;Process Reuse;Multiple Features;Complex Castings2|0|0更新时间：2026-02-14
Research·Computer Application
- “专家通过仿真和试验研究了SLM过程中熔池演变及扫描间距对IN718合金力学性能的影响，发现热量积累和导热性差异是熔池形状不对称主因，适当增大扫描间距可改善合金力学性能。”摘要：Effects of molten pool evolution and different scanning spacing on mechanical properties of IN718 alloy during SLM process were investigated by combining simulation and experiment. The results indicate that the difference of heat accumulation and thermal conductivity on both sides of molten pool are main responsible for the asymmetry of molten pool in the second trajectory， and the influence of laser heat source on the temperature of molten pool is basically consistant. The temperature of molten pool at the fixed point rises slowly at first， then rises sharply to the peak temperature， and finally drops rapidly. With the increase of scanning distance， the tensile strength of IN718 alloy is gradually decreased， which reaches up to 692 MPa at 75 µm， and the elongation is increased firstly and then decreased， which reaches the maximum of 29.2% at 100 µm. The mechanical properties of IN718 alloy can be improved by increasing scanning distance within an appropriate range.关键词：Selective Laser Melting（SLM）;IN718 Alloy;Numerical Simulation;Mechanical Propertyies2|0|0更新时间：2026-02-14
Research·Additive Manufacture
- “介绍了其在薄覆层复合板搅拌摩擦焊领域的研究进展，专家通过调整搅拌头转速的试验方法，探索了焊接工艺参数对组织性能的影响，为复合板优质焊接提供解决方案。”摘要：The process optimization of friction stir welding （FSW） for thin-cladding 6082/AZ31/6082 composite plates was carried out. By fixing the tool traverse speed at 60 mm/min and adjusting the tool rotation speed， the influence law of welding parameters on microstructure and mechanical properties of the joint was systematically investigated. The results indicate that a complete tri-layer composite structure is formed in the weld zone with rotation speed of 1 000 r/min， and grains in the magnesium alloy at nugget zone are refined to 3.007 μm with a dynamic recrystallization proportion of 90% and high angle grain boundaries accounting for 81%. The relationship between Al₃Mg₂ or Al₁₂Mg₁₇ intermetallic compound （IMC） diffusion layers with FSW process parameters was revealed. With rotation speed reaching 1 000 r/min， an optimized IMC thickness ratio of 3∶2 （Al₃Mg₂∶Al₁₂Mg₁₇） is achieved， where the tensile strength of joint is 174 MPa， which is 66.15% of that of base material. High-quality welding was realized by utilizing aluminum alloy cladding layers thinned by 30%， and the quantitative relationship between IMC distribution and mechanical properties of layered structure in the composite was elucidated.关键词：Thin-cladding;Tri-layer Composite Plate;IMC;Mechanical Properties2|0|0更新时间：2026-02-14
- “介绍了铝/镁异种合金搅拌摩擦焊接研究进展，专家探索了焊接速度和Sn箔中间层厚度对焊接接头性能的影响，为焊接工艺优化提供参考。”摘要：Effects of welding speed and thickness of Sn foil intermediate layer on the microstructure and mechanical properties of friction stir welding joint of Al/Mg dissimilar alloy were investigated. The results indicate that ideal joints can be obtained with welding speed of 20~50 mm/min and welding speed of 1 000 r/min. The intermetallic compounds in the nugget zone are mainly composed of Mg17Al12 and Mg2Al3， and the tensile strength of joint is increased and then decreased with increasing in welding speed， which reaches a maximum value of 168 MPa at 30 mm/min. After Sn foil addition， the intermetallic compounds in the nugget zone primarily consist of Mg2Sn， Mg17Al12， and Mg2Al3， and the tensile strength of joint is increased and then decreased with the increase in thickness of Sn foil interlayer， reaching a maximum value of 186 MPa at 0.02 mm， which is 67% of that of AZ31B base material.关键词：Al/Mg Dissimilar Alloy;Friction Stir Welding;Intermediate Layer;Microstructure;Tensile Strength2|0|0更新时间：2026-02-14
Research·Composites
- “介绍了其在Al-Cu-Mg-Ag-Sc耐热合金领域的研究进展，专家通过添加不同含量的Zr，探索了与过量Sc结合形成Al3（Sc，Zr）颗粒促进合金析出相析出的课题，为协同提升合金室温强度以及耐热性能提供解决方案。”摘要：Sc microalloying in Al-Cu-Mg-Ag alloys exhibits a double-edged sword. Sc addition can consume Cu solutes to form AlCuSc secondary phases， reducing the strength of alloys. However， Sc addition can promote the in-situ transformation from Ω phase into V-AlCuSc phase with excellent heat resistance， significantly improving the service temperature. Simultaneously enhancing the room-temperature strength and heat resistance of alloys has become a key problems for Sc-containing heat-resistant aluminum alloys. Various Zr contents were added to Al-Cu-Mg-Ag-Sc alloys， aiming to combine excess Sc with Zr to form Al3（Sc， Zr） particles， promoting the synergistic precipitation of Al3（Sc， Zr） particles and V-AlCuSc phases， thus improving the high-temperature service performance of the alloy. Tensile test and multi-scale TEM results indicate that Zr addition can refine the grains， which combines with Sc to generate Al3（Sc，Zr） particles， facilitating the precipitation of the secondary phases. A coexistence structure of Al3（Sc，Zr） particles with V-AlCuSc phase is formed， leading to higher strength and plasticity of the alloy under peak ageing and after thermal exposure at 400 ℃.关键词：Al-Cu-Mg-Ag Alloy;Precipitation;Al3（Sc， Zr） Particles;V-AlCuSc Phase;Thermal Stability2|0|0更新时间：2026-02-14
- “专家通过多种手段研究了Ti-5Cu合金不同区域的组织、热物性参数和力学性能，为合金性能优化提供了依据。”摘要：Microstructure，thermophysical properties，and mechanical properties of as-cast and heat-treated Ti-5Cu alloy ingots at different locations after holding at 850 °C for 2 h were investigated by optical microscopy（OM），scanning electron microscopy（SEM），X-ray diffraction（XRD）， laser thermal conductivity meter，tensile testing，and differential scanning calorimetry（DSC）.The results indicate that slight Cu depletion can be observed at edge zone，resulting in compositional segregation with lower mechanical properties and a phase transformation temperature of 810 ℃. Grains are coarsened at the central zone， with higher thermal conductivity and thermal expansion coefficient and a phase transformation temperature of 811 ℃. Desirable comprehensive performance is achieved at transition zone， with a phase transformation temperature of 811 ℃. After 850 ℃×2 h homogenization heat treatment， the grains are coarsened with uniform microstructure， and the hardness is significanly improved， while mechanical properties are reduced.关键词：Ti-5Cu Alloy;Phase Transformation Temperature;Mechanical Property;Thermal Conductivity;Heat Treatment2|0|0更新时间：2026-02-14
- “采用真空高压压铸工艺，通过Mn、Cr复合调控A356铝废料中的有害Fe相，系统研究了Fe含量在0.1%~0.6%范围内对AlSiMgMnCr合金组织和性能的影响。”摘要：Vacuum high-pressure die-casting （HPDC） process was employed to systematically investigate the effects of Fe content ranging from 0.1% to 0.6% （mass fraction） on microstructure and mechanical properties of AlSiMgMnCr alloys through co-modification of Mn and Cr on detrimental Fe-containing phases in A356 aluminum scrap. The results reveal that Fe content variation exerts negligible influence on the proportion and size of externally solidified crystals （ESCs） within the matrix. However， the size and area fraction of Fe-rich phases are increased progressively with Fe content rising， where the equivalent diameter is raised from approximately 10 μm to 30 μm， and morphology is evolved from fine blocky phases to Chinese script-type configurations. In the alloy system， mechanical properties remain stable across different Fe contents， while a significant reduction in bending performance and riveting capability occurs with Fe content of 0.5%. Fractographic analysis of riveting cracks identifies that intergranular brittle fracture is dominated. ThermoCalc simulations confirm that increase of Fe content leads to the augment of both precipitation temperature and mass fraction of Fe-containing phases （particularly β-Fe phases）， resulting in coarsened primary phase， which is directly contributed to the degradation of bending and riveting properties.关键词：High Pressure Die Casting;A356 Aluminium Alloy;Recycled Aluminium;Fe-rich Phase;Mechanical Properties2|0|0更新时间：2026-02-14
- “专家通过疲劳测试与扫描电镜微观表征等方法，系统评估了不同规格接触线在多种环境工况下的疲劳性能，为接触线材料的优化选择提供了重要依据。”摘要：Fatigue performance of four types of contact wires （CTS， CTA， CTSM， CTAM） under varying environmental conditions was investigated through fatigue testing and SEM analysis. The results indicate that CTAM wire exhibits the optimal fatigue performance under equivalent strength grade conditions， which is followed by CTSM and CTA， while CTS shows the poorest fatigue resistance. The fatigue performance of Cu-Ag alloy contact wires is generally superior to Cu-Sn alloys with equivalent grade， and the trend remains consistent across varying temperature conditions. Temperature significantly influences the fatigue behavior of contact wires. At lower temperatures， fatigue performance is improved and fatigue life is increased. The fatigue fracture of copper alloy contact wires is characterized by typical ductile fracture， of which the mechanism belongs to microhole coalescence fracture. At 150 ℃， the size and depth of dimple in the instantaneous fracture zone are generally larger than those in specimens at 20 ℃. Contact wires exhibit enhanced resistance to fatigue crack initiation and propagation in low-temperature environments， and low-tempereture specimens display higher roughness characteristics in the crack initiation region compared to high-temperature conditions， which is directly correlated with enhanced fatigue resistance.关键词：Contact Wire;Fatigue Performance;Temperature;Ductile Fracture2|0|0更新时间：2026-02-14
- “介绍了其在合金强化领域的研究进展，相关专家制备了基于Al-5.5Cu-1.0Mn-0.5Mg的微/纳颗粒强化合金，验证了微/纳颗粒在提高合金性能方面的有效性，为合金性能提升开辟了新方向。”摘要：The effects of micro/nano-particles on microstructure and mechanical properties of particle reinforced Al-5.5Cu-1.0Mn-0.5Mg alloy were systematically investigated by metallographic microscopy， transmission electron microscopy， and tensile tests. The results indicate that TiC-TiB2 particles significantly refine the grain， and grain size is reduced from 123 μm to 78 μm. The introduction of micro/nano-particles enhances the strength and toughness of alloy through multiple mechanisms including self-reinforcement， precipitate promotion， and grain refinement， where the tensile strength is increased from 447.3 MPa to 470.7 MPa， and elongation is enhanced from 11.0% to 13.5%. Moreover， a multi-mechanism strengthening model for micro/nano-particle reinforced alloy was established， and the theoretical calculations exhibit excellent agreement with experimental data， further validating the effectiveness of micro/nano-particles in enhancing performance of alloy.关键词：Al-Cu-Mn-Mg Alloy;TiC-TiB2 Particles;Microstructure Evolution;Mechanical Properties2|0|0更新时间：2026-02-14
- “专家利用Gleeble-3500试验机研究不同Fe含量TA4纯钛热变形行为，发现Fe可降低流动应力、细化晶粒、促进动态再结晶，为钛合金材料性能优化提供新思路。”摘要：Hot compression deformation of TA4 pure titanium with different Fe contents was carried out by Gleeble-3500 thermomechanical simulator. The effects of Fe element on hot deformation behavior and deformation mechanism of TA4 pure titanium were investigated. The results indicate that Fe addition is beneficial to reduce the high temperature flow stress of TA4 pure titanium material， which presents more obvious softening phenomenon， and the softening degree is increased with the increase of Fe content. In addition， Fe addition leads to significant grain refinement， and the hot deformation texture of TA4 pure titanium with approximate ｛0001｝∥ND gradually disappears， which promotes the gradual randomization of α grain orientation. TA4 pure titanium with Fe addition suffers severe plastic deformation during hot compression. Fe facilitates the dynamic recrystallization process of α grains， and the high temperature softening mechanism is gradually converted from dynamic recovery （DRV） to dynamic recrystallization （DRX） with Fe addition.关键词：Pure Titanium;Hot Deformation;Microstructure Evolution;Dynamic Recrystallization2|0|0更新时间：2026-02-14
- ““利用快速寿命测试装置对Ni-Cr合金丝进行不同温度下的快速寿命测试和通电氧化试验，采用扫描电镜（SEM）和能量色散谱（EDS）技术对合金丝的微观结构和化学成分进行分析，并通过X射线衍射（XRD）技术对氧化膜的相组成进行深入研究。结果显示，随氧化温度降低，Ni-Cr合金丝的快速寿命显著增长，氧化膜的生长过程与氧化过程的三阶段理论相吻合，即在3 h的高温通电氧化试验中，氧化膜表面的微观形貌因氧化温度的不同而表现出显著差异，氧化温度的升高导致氧化物颗粒尺寸增大，并在膜表面形成分层、裂纹和孔洞。3种合金的氧化膜主要由Cr2O3组成，该成分显著提升了合金在高温下的抗氧化性能。””摘要：The rapid life test and energized oxidation test were subjected to Ni-Cr alloy wires at different temperatures by rapid life test device. The morphology and composition of alloy wires were analyzed by scanning electron microscopy （SEM） and energy dispersive spectrometry （EDS）， and phase composition of oxidized film was investigated by X-ray diffraction （XRD）. The results indicate that the rapid life of Ni-Cr alloy wires is significantly improved with the reduction of oxidation temperature， and the growth of oxide film is in accordance with the three-stage theory of oxidation process. During high-temperature energized oxidation process for 3 h， the morphology of film shows great differences due to different oxidation temperatures. The dimension of oxide particles is increased with the increase of temperature， and delamination， cracks and pores appear on the surface of the film. The oxide films of alloys are mainly composed of Cr2O3， which significantly improves the high-temperature oxidation resistance.关键词：Ni-Cr Alloys;Oxide Film;High Temperature Oxidation2|0|0更新时间：2026-02-14
- “采用定向凝固技术制备 Fe-6.5Si 合金，研究拉速对合金定向凝固初始启动前端组织演变以及力学性能和磁性能的影响。结果表明，定向凝固 Fe-6.5Si 合金初始启动界面前端退火区柱状枝晶平行于拉速方向生长，过渡区为大块状晶粒。合金初始启动界面前端主要由 A2 相和（B2+D03）层状组织组成，从底部到顶部（B2+D03）层状组织含量降低。随拉速增加，Fe-6.5Si 合金中（B2+D03）层状组织含量增多，合金磁极化强度先增加后降低，铸锭的平均硬度值增加。”摘要：The influence of drawing speed on the strength and magnetic properties of initial start front end in directional solidified Fe-6.5Si alloy was investigated. The phase structure， microstructure， phase composition and magnetic performance were determined by XRD， SEM， TEM，and vibration sample magnetometer at high and low temperature.The results indicate that the columnar dendrite at annealing region of initial start front end in Fe-6.5Si alloy is grown along the direction parallel to drawing speed，and the transition area emerges large block grains. The initial start front end of alloy is mainly composed of A2 and（B2+D03）layered phase，and the content of （B2+D03） laminated phase is decreased from bottom to top.With drawing speed rising， the content of （B2+D03） laminated phase in Fe-6.5Si alloy is increased， and the magnetic polarization strength is increased and then decreased， while the average hardness value of ingot is increscent.关键词：Directional Solidification Melting;Fe-6.5Si Alloy;Drawing Speed;Temperature Gradient2|0|0更新时间：2026-02-14
- “介绍了其在AlSi7Mg合金熔炼工艺领域的研究进展，专家通过控制熔炼工艺，研究了Mg的烧损行为及含量对合金微观组织和力学性能的影响，为获得更高综合力学性能的AlSi7Mg合金提供了解决方案。”摘要：The influence of Mg burning patterns and Mg content on microstructure and properties of AlSi7Mg alloy was investigated by controlling the melting process， aiming to achieve AlSi7Mg alloy with superior comprehensive mechanical properties. The results indicate that Mg burning quantities reaches the maximum of 7.69% at argon gas refining stage during the refining， modification， and heat preservation process of AlSi7Mg alloy. As Mg content rises， the mean size of silicon phases in the alloy under T6 heat treatment is first decreased and then increased， and the overall tensile strength and yield strength are increased， while elongation is declined. The mechanical properties of AlSi7Mg alloy is desirable with Mg content of 0.6%， where the tensile strength， yield strength and elongation reach 366.52 MPa， 303.65 MPa， and 7%， respectively， meanwhile the silicon phase size is 19.236 μm².关键词：AlSi7Mg Alloy;Element Burning;Mg Content;Silicon Phase;Mechanical Properties2|0|0更新时间：2026-02-14
Research·Alloy Performance
- “介绍了其在铸造领域的研究进展，相关专家探索了采用水溶性粘结剂及硅砂作为造型材料结合喷水快速冷却的课题，为提高铸件质量和性能提供了新方法。”摘要：Taking water-soluble binder and silica sand as molding materials combinined with water spraying for rapid cooling， the temperature curves during solidification process were measured using thermocouple， and the relationship between microstructure and cooling rate was investigated. The results indicate that a well-dissolved and high-strength mold can be obtained when weight ratio of silica sand， sodium silicate， magnesium sulfate and fly ash is 1∶0.03∶0.006∶0.006. Combined with rapid cooling， the produced castings are complete and free of porosity with refined internal structure. The larger thermal gradient allows for the adequate supply at the sprue， achieving sequential solidification， leading to fine eutectic silicon. Compared with natural cooling， the microhardness under water cooling conditions is increased by 20% due to increscent cooling rate and corresponding increase in solid solubility.关键词：Water-soluble Sand Casting;ZL114A alloy;Microstructure;Microhardness2|0|0更新时间：2026-02-14
- “介绍了其在材料科学领域的研究进展，专家对比研究了热等静压态和退火态ZTC4合金的显微组织与性能，为合金性能优化提供了新思路。”摘要：The microstructural characteristics and room-temperature tensile behavior of ZTC4 （Ti-6Al-4V） alloys were investigated after 920 ℃×130 MPa×3 h HIP and 920 ℃×130 MPa×3 h HIP+800 ℃×2 h annealing. The results indicate that the microstructure of ZTC4 alloy at HIP state exhibits typical lamellar characteristics with compactly arranged lamellae. The yield strength and elongation of the alloy are 755 MPa and 7%， respectively. After HIP， α lamellar structure in as-annealed ZTC4 alloy is dissolved along the groove structure at the interface with partial α lamellae broken， and β phase between the lamellae are thickened. The tensile yield strength is increased to 837 MPa， while elongation is decreased to 4%. During the deformation of ZTC4 alloy， dislocation glides are impeded by phase interfaces， which are aggregated in the interstitial regions between α lamellae. Microcracks predominantly initiate at α lamellae and propagate along the interfaces. The fragmentation of lamellae after annealing augments the interfaces， amplifying the impediment to dislocation and facilitation of crack propagation.关键词：ZTC4 Titanium Alloy;Annealing;Microstructural Evolution;Mechanical Properties;Fracture Mechanism4|0|0更新时间：2026-02-14
- “介绍了其在17 - 4PH钢激光熔覆热影响区组织热稳定性领域的研究进展，相关专家建立了析出相溶解动力学演化模型，为调控马氏体相变进程提供了新思路。”摘要：The microstructure thermal stability of heat affected zone in laser cladding 17-4PH steel at high-temperature and low-temperature stages was investigated through experiments， finite element analysis， and phase field multiscale simulations. A kinetic evolution model for precipitate dissolution was established based on dissolution experiments at high temperatures. By simulating finite element temperature field and combining with the precipitation phase dynamics evolution model， the yield strength of austenite and variation in matrix elements was calculated. The onset temperature of phase transformation in 17-4PH steel at different heat affected zones was obtained through martensitic transformation experiments. The influence of precipitation phase evolution at high temperature stage during laser cladding of 17-4PH steel on martensitic transformation at low temperature stage was analyzed through phase field method， and the role of chemical free energy and non-chemical energy of alloy in regulating martensitic transformation process was further clarified. The results indicate that elastic strain energy plays a dominant role in variation of martensitic transformation temperature.关键词：17-4PH Steel;Heat-affected Zone;Martensitic Transformation;Phase-field Method4|0|0更新时间：2026-02-14
- “介绍了其在泡沫铝领域的研究进展，专家采用熔体发泡法成功制备了含陶粒砂泡沫铝复合材料，为解决泡沫铝孔结构均一性和强度不足问题提供了新方案。”摘要：Aluminum foam exhibits advantages such as lightweight， energy absorption， shock mitigation， sound absorption， and noise reduction， however， the non-uniform pore structure and insufficient strength of aluminum foam have limited its wider application. Taking ceramic sand as reinforcement， aluminum foam composites containing ceramic sand were successfully fabricated using melt foaming method through surface copper coating treatment. The microstructures of composites were observed by SEM and TEM， and the compressive strength and energy absorption properties were analyzed by electronic universal testing machine. The results indicate that ceramic sand significantly impact the pore size and compression properties of aluminum foams. Compared to that without ceramic sand， the average pore diameter of aluminum foam containing 1% ceramic sand is decreased， while compressive strength is increased， which is attributed to the appropriate amount of ceramic sand preventing bubble growth and coalescence， thereby reducing the pore size. Moreover， ceramic sand modified by nano-copper displays excellent wettability with aluminum melt， leading to enhanced interfacial bonding and enhanced mechanical properties of composites.关键词：Aluminum Foam;Nano-copper Modification;Ceramic Sand;Composites;Compression Performance2|0|0更新时间：2026-02-14
- “介绍了其在铝合金熔体处理领域的研究进展，专家通过有限元数值模拟计算了不同峰值电流下的表面脉冲磁场的ZL114A铝合金熔体内部的磁感应强度、电磁力、磁能分布情况，并且结合相关试验验证，深入分析了ZL114A铝合金显微组织的变化，为铝合金熔体处理技术的发展提供了新的思路和方法。”摘要：Finite element numerical simulation was employed to calculate the magnetic induction intensity， electromagnetic force and magnetic energy distribution inside ZL114A aluminum alloy melt with surface pulsed magnetic field under different peak currents， and microstructure evolution of ZL114A aluminum alloy was analyzed in detail combined with relevant experiment verification. The results indicate that the magnetic induction intensity， electromagnetic force and electromagnetic energy distribution of ZL114A aluminum alloy melt are symmetrical in Z-axis under the action of surface pulsed magnetic field. The magnetic induction intensity is less at the core and reaches the maximum at the edge of upper surface. The size distribution of electromagnetic force and electromagnetic energy achieves the maximum at the core and less at the edge of upper surface. After applying surface pulsed magnetic field to ZL114A aluminum alloy melt， α-Al grain in the solidification structure is obviously refined， and the eutectic Si is evenly distributed， of which the morphology is transformed from thick strip to fine strip or short bar. Combined with simulation results， the mean size of grain， area proportion of eutectic Si and average length-to-diameter ratio of α-Al in specimens treated with pulsed surface magnetic field are decreased by 21.0%， 9.5% and 22.9%， respectively， compared with those of ones without pulsed surface magnetic field， while the hardness is increased by 7.3%.关键词：ZL114A;Surface Pulsed Magnetic Field;Magnetic Induction Intensity;Grain Refinement2|0|0更新时间：2026-02-14
Research·Alloy Process
- “一体化压铸车身后地板集成多个零件，减少焊点与零件数量，实现轻量化，降低制造难度，缩短开发周期。专家优化压铸动作，将循环时间缩短至90秒，产品尺寸、质量、性能均达标。”摘要：The integrated die-casting rear floor of automobile integrates multiple components， significantly reducing the number of welding points and components. Moreover， lightweighting effects were achieved to greatly reduce the manufacturing difficulty， shortening the development cycle of entire automobile. To further reduce costs， the composition of die-casting cycle throughout the entire process was analyzed， and the actions were optimized. Eventually， the die-casting cycle time is reduced to 90 s. The product size， internal quality， and mechanical properties were tested， which meets the product quality requirements.关键词：Integrated Die-casting;Automobile Rear Body;Die-casting Cycle Time;Mechanical Property3|1|0更新时间：2026-02-14
- “针对特高压GIS壳体漏气难题，专家分析原砂型低压铸造工艺缺陷，提出改进方案。新工艺提高出品率8%，减少砂型，有效解决漏气问题，已稳定生产超100件。”摘要：The gas leakage problem in the shells prepared for ultra-high voltage GIS by primary sand mold low-pressure casting process was analyzed， and process improvement was carried out. The simulation results indicate that the leakage at the disc root in primary process is attributed to insufficient filling of the cylinder inner runner through the reinforcement ribs for the hot spot， resulting in shrinkage porosity and cavity.Due to the temperature gradient less than 0.85 ℃/cm when complete solidification of the flange begins at the gate position， slow solidification occurs leads to H2 precipitation to generate pinholes，resulting in the leakage on the flange surface. A bottom pouring system with a runner leading to the inner surface and a trapezoidal plate shaped gap runner was utilized with arranging cold iron on the disc， and flange cold iron was thickened. Compared with that of primary process， the yield rate of optimized process is increased by 8%， and one layer of sand mold is reduced. Simulation reveals that the disc can achieve effective filling. The temperature gradient is about 2.4 ℃/cm when complete solidification of the flange begins at the gate position， and the solidification is significantly accelerated. More than 100 pieces have been produced， indicating the stable process.关键词：GIS;Aluminum Alloy;Shell;Sand Mold Low-pressure Casting;Process Improvement2|0|0更新时间：2026-02-14
- “介绍了新能源汽车水冷型电机壳体研究进展，专家分析了某新能源电机内壳压铸件失效模式，采用数值模拟优化浇注系统，通过T5热处理、热套压装和搅拌摩擦焊工艺提升性能，为保证水冷型电机内壳高性能提供解决方案。”摘要：Water-cooled motor shell is one of the key components in new electric drive assembly of new energy vehicles， which exhibits the characteristics of high heat dissipation， lightweight and high mechanical properties as well as higher requirements for internal quality and compactness of motor shell. Based on the failure mode analysis of inner shell die casting of a new energy motor， numerical simulation was conducted to investigate the filling state of liquid aluminum under a variety of pouring systems， so as to select optimized pouring system. Meanwhile， the stress was eliminated by T5 heat treatment to improve performance， and DOE was carried out to verify the optimal hot-sleeve pressing and process parameters for friction stir welding， minimizing the impact on the performance of castings. The results reveal that reasonable pouring system， T5 heat treatment， hot-sleeve pressing and friction stir welding are the key to ensure the high performance of inner shell of water-cooled motor.关键词：Die Casting;Motor Shell;Properties2|0|0更新时间：2026-02-14
Application·Die Casting
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