最新刊期
      卷 44 ， 期 6 ， 2024

        Current Recommendation

      • “最新研究揭示，Si元素的加入显著改善了Cu-10Fe合金的组织结构和软磁性能，铸态Cu-10Fe-1Si合金展现出优异的综合性能，为合金材料开发提供了新思路。”
        ”
        ZHANG Yubo,CHEN Jiale,JIE Jinchuan,LI Tingju
        Vol. 44, Issue 6, Pages: 721-727(2024) DOI: 10.15980/j.tzzz.2024.06.001
        摘要：Effects of Si on microstructure， solidification behavior， mechanical and soft magnetic properties of Cu-10Fe alloy were investigated by optical microscope， electron probe analysis， X-ray diffractometer， phase diagram calculation， universal mechanical testing machine and vibrating sample magnetometer. The results indicate that with the increase of Si content from 0 to 2%， the mass fraction of Fe-rich phase is increased from 7.39% to 9.27%. Meanwhile，the growth of Fe-rich dendrites is inhibited， which is transformed from developed dendrites to cellular dendrite morphology with lower shape anisotropy， resulting in the enhancement of soft magnetic properties. The calculation of phase diagram reveals that the area of immiscible region continues to expand with Si addition， indicating the significant liquid-liquid phase separation. Fe-rich phase collides and aggregates during the solidification process， leading to the increase firstly and then decrease of microstructure uniformity and properties. The as-cast Cu-10Fe-1Si alloy exhibits the optimal comprehensive performance， where the tensile strength and saturation magnetization are 338.7 MPa and 17.28 emu/g， respectively， which are 11.3% and 21.9% higher than those of Cu-10Fe alloy. The coercivity is 13.75 Oe， which is 49.9% lower than that of Cu-10Fe alloy.  
        关键词：Cu-10Fe-xSi Alloys;Microstructure;Mechanical Properties;Soft Magnetic Properties   
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      • “在增材制造领域，研究揭示了球形石墨粉末与人造石墨比例、包覆预处理次数和激光能量密度对石墨件成形精度和抗弯强度的影响，并通过正交试验确定了最优工艺参数，成功打印出细小特征尺寸的多孔石墨骨架。”
        ”
        WU Haihua,JI Yunxin,WU Zhengjia,HAO Jiahuan,WEI Heng,GONG Liang,ZHANG Hualong,GAO Aodong
        Vol. 44, Issue 6, Pages: 728-735(2024) DOI: 10.15980/j.tzzz.2024.06.002
        摘要：Effects of different volume ratios of spherical graphite powder to artificial graphite， cladding pretreatment times， and laser energy density on molding accuracy and bending strength of SLS graphite components were investigated， and the mechanisms were revealed. The optimal combination of process parameters was further determined by orthogonal experiments to obtain porous graphite skeletons with fine feature sizes. The results indicate that under the certain composition， by increasing the volume ratio of artificial graphite powder to spherical graphite， it contributes to the stacking density and thermal conductivity of the mixed powder as well as the bending strength of SLS graphite components， which is adverse to molding accuracy. After the graphite powder cladding pretreatment， the effective bonding force between the powders is increased， ensuring the bending strength and molding accuracy of SLS graphite parts under the premise of reducing thermal conductivity and enhancing the stacking density. Finally， a reasonable combination of process parameters was selected to successfully print out a diamond-like porous graphite skeleton with a complete structure and a minimum feature size of ϕ1.0 mm， where the relative error of billet size along the X⁃and Y⁃axis is controlled below 2%， and that along the Z-axis is 8.25%， and bending strength reaches 2.84 MPa.  
        关键词：Spherical Graphite Powder;Selective Laser Sintering;Forming Accuracy;Bending Strength   
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        发布时间：2024-06-27

        Research·Review

      • “在电子通信领域，铝合金因质轻、价廉、导热性能好而广泛应用。但随着电子产品和通信设备的轻量化和集成化，常规导热铝合金已不能满足需求。本文综述了高导热铝合金的研究进展，探讨了合金元素、铸造方式和热处理工艺对合金热导率的影响，并展望了其未来发展。”
        ”
        HOU Huibing,LIU Leilei,HUANG Chengyi,REN Yuelu,DU Jun,LI Ling,FEI Liangshuai,LI Chengbo
        Vol. 44, Issue 6, Pages: 736-744(2024) DOI: 10.15980/j.tzzz.2024.06.003
        摘要：Aluminum alloys are widely used in the field of electronic communications due to the lightweight， low cost， and desirable thermal conductivity. Electronic products and communication devices are becoming more lightweight and integrated， leading to an increasing heat dissipation per unit volume， and conventional thermal conductive aluminum alloys cann't meet the requirements. The domestic and overseas research progress in aluminum alloys with high thermal conductivity were summarized. The thermal conduction mechanism of aluminum alloys was briefly described， and effects of elements， casting methods， and heat treatment on the thermal conductivity of alloys were expounded in detail. In addition， the research status of quantitative models for thermal conductivity of aluminum alloys were reviewed， including Wiedemann-Franz Law， series-parallel model， Maxwell model， and Hashin-Shtrikman model. Finally， the future development of high thermal conductivity aluminum alloys was prospected.  
        关键词：High Thermal Conductivity;Thermal Conductivity Mechanism;Heat Treatment;Quantification Model   
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      • “最新研究进展显示，外加物理场技术在半连续铸造领域取得突破，有效改善有色金属坯料品质，为解决传统铸造问题提供新方案。”
        ”
        DUAN Wenchao,LI Jinbao,PAN Yanlin,HAN Feng,ZHU Xinjie,MAO Hua,ZHOU Guxin,LANG Yujing,WANG Sheng,ZHANG Zhiqiang
        Vol. 44, Issue 6, Pages: 745-752(2024) DOI: 10.15980/j.tzzz.2024.06.004
        摘要：As a main preparation method for non-ferrous light alloy billets at present， semi-continuous casting technology determines the quality and size of billets， which has a significant effect on subsequent processing and end-use performance. However， there exist problems in the billets prepared by traditional semi-continuous casting technology， such as coarse and uneven microstructure， high cracking tendency， and severe segregation. Application of external physical field is a highly effective method to improve the quality of billets. The development of semi-continuous casting technology under external physical fields was reviewed， and the mechanism， development history， research progress and existing problems of various physical field treatment techniques controlling the quality of melt and billet were systematically discussed. Finally， the future development of the technology was prospected.  
        关键词：Non-ferrous Light Alloys;Semi-continuous Casting;Physical Field;Structure Control;Billet   
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      • “最新研究揭示了非金属元素对高熵合金微观组织和力学性能的影响，通过晶格畸变和化合物沉淀实现细晶强化，为合金性能提升提供了新思路。”
        ”
        GU Hang,HE Yiqiang,QIAN Sicheng,DING Yunfei,FENG Wen,WANG Tong,LUO Yi,SU Qianhang,XU Hulin,WANG Yan,HU Qiong
        Vol. 44, Issue 6, Pages: 753-759(2024) DOI: 10.15980/j.tzzz.2024.06.005
        摘要：The research progress in effects of common non-metallic elements on microstructure and mechanical properties of HEAs were summarized， and influence of microstructure evolution and strengthening mechanism on mechanical properties was analyzed. The effect of atomic radius of nonmetallic elements on lattice distortion and compound precipitation in the high-entropy alloy was discussed to achieve effect of fine grain refinement， thus affecting microstructure and mechanical properties of HEAs through grain strengthening and the second phase strengthening.  
        关键词：High Entropy Alloy;Non-metallic Elements;Microstructure;Mechanical Properties   
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        Research·Computer Application

      • “在小型铝铸件涡轮表面缺陷检测领域，研究者提出了一种改进YOLOv5的算法，通过数据增强、K-means++算法、CA注意力机制模块和添加小目标检测层，显著提升了小目标缺陷的检测效果，平均精度均值达到97.8%，为智能制造自动化生产提供了有效解决方案。”
        ”
        GE Qianfeng,YUAN Hao,WANG Yuan,HOU Yongtao,CAO Wenwu,PENG Xudong
        Vol. 44, Issue 6, Pages: 760-765(2024) DOI: 10.15980/j.tzzz.2024.06.006
        摘要：Aiming at the problem of difficulty in detection of small aluminum casting turbine due to the complicated surface and small defect， an improved YOLOv5 surface defect detection algorithm for small aluminum casting turbine was proposed. The data enhancement strategy was utilized to balance the sample distribution of different categories for image preprocessing. The K-means++ algorithm was taken to obtain the optimal prior frame suitable for the data set. The feature extraction structure of the network was modified， and CA attention mechanism module was added to the backbone network， which helps to the accurate positioning and recognition of model. Addition of a small target detection layer can enhance the detection effect on small objects. The results indicate that the modified algorithm exhibits a better detection effect on small target defects， where the mean average precision （mAP） reaches 97.8%， meeting the requirement of intelligent manufacturing automation production.  
        关键词：YOLOv5;Attention Mechanism;Small Target Detection Layer;Defect Detection   
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      • “在隔热涂层领域，专家建立了有限差分模型，开发了模拟软件，验证了软件的适应性和可靠性。”
        ”
        WANG Yueping,TAN Yunxiang,SU Mengxing,WANG Long,ZHANG Yu,YIN Yajun
        Vol. 44, Issue 6, Pages: 766-769(2024) DOI: 10.15980/j.tzzz.2024.06.007
        摘要：The finite difference model of reflective thermal insulation coating was established， and a numerical simulation algorithm of two-dimensional temperature field and ellipse interpolation algorithm of three-dimensional temperature field for the heat transfer process of the coating were proposed. A simulation software to predict thermal insulation performances of coating was developed based on Qt application development framework and CPU parallel acceleration. On this basis， the temperature field of coated and uncoated substrates was calculated， and effects of coating on temperature rise rate and final temperature of substrate were obtained， verifying the adaptability and reliability of the software.  
        关键词：Thermal Insulation Coating;Temperature Field;Numerical Simulation;Finite Difference Methods   
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      • “在计算流体力学与材料科学交叉领域，研究者将流体体积函数法与元胞自动机模型相结合，成功模拟了凝固过程中的晶粒运动行为。该耦合模型不仅保持了界面的高保真性，还提高了计算效率，为深入理解枝晶生长机制提供了新的视角。”
        ”
        ZHANG Bing,ZHU Baofeng,ZHANG Shijie,ZHANG Yu,LI Ri
        Vol. 44, Issue 6, Pages: 770-775(2024) DOI: 10.15980/j.tzzz.2024.06.008
        摘要：The fluid volume function method was coupled with cellular automata model to investigate the motion behavior of grain during solidification process. The simulation results indicate that the fluid volume function method exhibits desirable interface fidelity， and can track the solid-liquid interface with a small error， which has little effects on the subsequent calculation of dendritic growth. The motion behavior of dendrites can affect the solute distribution in the melt， thus affecting the growth morphology of dendrites. The coupled model can simulate the dendrite motion process with a small error， solving the difficulty in satisfying the high shape fidelity and high computational efficiency of cellular automata method.  
        关键词：Dendrite Motion;Fluid Volume Function;Lattice Boltzmann;Cellular Automata Model   
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      • “最新研究揭示了超声条件下单个空化泡的动力学行为，发现超声幅值对空化泡运动有显著影响，为气体脱出过程提供新见解。”
        ”
        LI Tiansu,LIU Jianxiong
        Vol. 44, Issue 6, Pages: 776-780(2024) DOI: 10.15980/j.tzzz.2024.06.009
        摘要：The behavior of a single cavitation bubble under different ultrasonic conditions was investigated by numerical simulation. The results indicate that the ultrasonic amplitude has a significant effect on the movement of cavitation bubbles. When the ultrasonic amplitude is below 101 kPa， the movement of the bubble follows a sinusoidal pattern with minor size variation. With the increase of ultrasonic amplitude， the movement of cavitation bubbles is converted to transient cavitation. During the transient cavitation process， lower ultrasonic frequency， ambient pressure and smaller initial radius of cavitation bubble can enhance the cavitation effect. When the ultrasonic amplitude reaches 1 414 kPa， the bubble size becomes large and difficult to be compressed and collapsed， thus prolonging the existence time in the melt and further facilitating the gas extraction process.  
        关键词：Silver Melt;Ultrasonic Degassing;Cavitation Bubble;Numerical Simulation   
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        Research·Composites

      • “在材料混合技术领域，研究人员利用ANSYS Fluent软件模拟了不同倾角搅拌桨对坩埚内部流场的影响。通过k-ε湍流模型和Euler-Euler多相流模型，分析了涡流分布和颗粒分散效果，为提高材料混合效率提供了新思路。”
        ”
        GUO Ziyi,DENG Kunkun,NIE Kaibo,WANG Cuiju,LIU Li
        Vol. 44, Issue 6, Pages: 781-790(2024) DOI: 10.15980/j.tzzz.2024.06.010
        摘要：The simulation of internal flow field and variation characteristics in the crucible was carried out by finite element under action of various agitator angles （30°， 45°， 60°， 90°）. The k-ε turbulence model and Euler-Euler multiphase flow model were established to analyze the vortex distribution law in the crucible， and dispersion of simulated particle was verified. The results indicate that the flow field in the crucible with straight agitator is fast， which is divided into two circulation regions （double loop flow type） by impeller stirring， and the confusion degree is low， inhibiting the dispersion effect of particles. The internal rotation of oblique agitator surface is obvious with a high vector confusion and efficiency of particle dispersion in the first stage. In addition， there exists axial flow in the crucible with oblique agitator， which can form an integrated circulation region （single loop flow type）， leading to larger flow region of particles and desirable dispersion.  
        关键词：Numerical Simulation;Mechanical Stirring;Particle Reinforcement;Fluid Behavior;Particle Dispersion   
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        Research·Additive Manufacture

      • “在高压降工况下，新型3D打印迷宫盘片有效降低气蚀冲蚀风险，同时提升力学性能，为调节阀设计提供创新解决方案。”
        ”
        WANG Yongchao,ZHANG Xiaohui,SUN Changqing,DENG Jiali
        Vol. 44, Issue 6, Pages: 791-796(2024) DOI: 10.15980/j.tzzz.2024.06.011
        摘要：In view of cavitation and erosion in control valves under high pressure drop conditions， a novel labyrinth disc was proposed based on traditional labyrinth control valve， combined with metal 3D printing technology and valve design， and computational fluid dynamics （CFD） software was utilized to perform flow field simulation analysis. 316L stainless steel specimens were produced by selective laser melting （SLM）， and compared with rolled specimens in terms of mechanical properties. The results indicate that the novel labyrinth disc possesses desirable flow performance， which can effectively reduce the pressure fluctuation and outlet velocity of the medium in the flow channel while meeting the actual working condition requirements， and reduce the risk of cavitation and erosion. The mechanical properties of 3D printed specimens are superior to those of rolled specimens， meeting operating requirements of valve parts.  
        关键词：SLM;3D Printing;316L Stainless Steel;Mechanical Properties   
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      • “在电弧增材制造领域，研究揭示了工艺参数对5356铝合金成形质量、组织和性能的影响。通过优化沉积电流、速度和层间温度，实现了铝合金薄壁件的高质量沉积。”
        ”
        YU Huasen,YU Zuying,WANG Jin,SUN Jianxin
        Vol. 44, Issue 6, Pages: 797-802(2024) DOI: 10.15980/j.tzzz.2024.06.012
        摘要：Effects of process parameters on forming quality， microstructure and properties of WAAM 5356 aluminum alloy were investigated by surface waviness calculation， microstructure observation， hardness and tensile testing. The results reveal that excessive or insufficient deposition current， deposition velocity and interlayer temperature are all adverse to forming. As the deposition current is increased from 70 A to 100 A， the grain size and porosity of Al5356 are gradually increased， while the hardness is decreased. With deposition current of 85 A， the microstructure is homogeneous with well interlayer fusion， indicating desirable comprehensive mechanical properties. A set of process parameters suitable for depositing Al5356 thin-walled components was determined as follows： deposition current of 85 A， deposition velocity of 4 mm/s， interlayer temperature of 100~150 ℃.  
        关键词：WAAM;Process Parameter;5356 Aluminum Alloy;Microstructure;Mechanical Property   
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        Research·Alloy Process

      • “最新研究揭示，双级时效显著提升Mg-13Gd-5Y-0.6Mn-0.5Ca挤压镁合金的力学性能，伸长率从1.8%增至2.5%，为镁合金应用提供新解决方案。”
        ”
        WEI Haobo,CHEN Jieyi,WU Zonggang,RUAN Shihui,LI Yan,YANG Mingbo
        Vol. 44, Issue 6, Pages: 803-807(2024) DOI: 10.15980/j.tzzz.2024.06.013
        摘要：The effects of two-stage aging on the precipitated equilibrium phases and properties of Mg-13Gd-5Y-0.6Mn-0.5Ca extruded magnesium alloy were investigated. The results reveal that two-stage aging and single-stage aging can effectively improve the room temperature tensile properties of tested magnesium alloy， however the effects of two-stage aging is superior to that of single-stage aging， and elongation is increased from 1.8% to 2.5%. The mechanism for further improvement of the tested alloy by two-stage aging is characterized by promoting the aging precipitation of Mg5Gd equilibrium phase.  
        关键词：Magnesium Alloy;Mg-13Gd-5Y-0.6Mn;Two-stage Aging;Elongation   
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      • “最新研究揭示，通过金属型重力铸造和挤压铸造工艺制备的Al-9Si-2Cu合金，在不同Fe含量和冷却方式下，合金的微观组织、力学性能和导热性能得到显著优化。特别是在75 MPa挤压压力和快速冷却条件下，Al-9Si-2Cu-0.2Fe合金展现出卓越的综合性能，其抗拉强度、伸长率和热导率分别达到261 MPa、14.1%和142 W/（m·K）。”
        ”
        ZHANG Ruixiao,TANG Chuanyao,LIU Lehua,LUO Zongqiang,ZHANG Weiwen
        Vol. 44, Issue 6, Pages: 808-813(2024) DOI: 10.15980/j.tzzz.2024.06.014
        摘要：A series of Al-9Si-2Cu alloys with different Fe contents were prepared by metal mould gravity casting and squeeze casting in air cooling and rapid cooling， respectively， and microstructure， mechanical and thermal properties of the alloys were investigated. The results indicate that the types of Fe-rich phases in the alloy remain unchanged under extrusion pressure of 75 MPa and rapid cooling condition with Fe content ranging from 0.2%~1.2%， which are all β-Al5FeSi phases， while the content of β-Fe in the alloy is reduced， resulting in the aggravation of lattice distortion and reduction of thermal conductivity. Under the conditions of 75 MPa squeeze casting and rapid cooling， the mechanical properties and thermal conductivity of Al-9Si-2Cu-0.2Fe alloy are optimal， where the tensile strength， elongation and thermal conductivity reach 261 MPa， 14.1% and 142 W/（m·K）， respectively.  
        关键词：Al-Si-Cu Alloy;Squeeze Casting;Fe-rich Phases;Mechanical Properties;Thermal Properties   
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      • “最新研究发现，脉冲磁场处理可显著改善石墨型铸造Mg-6Gd-3Y-0.6Zr合金的凝固组织和力学性能。在最佳工艺参数下，合金晶粒尺寸减小32.9%，抗拉强度和伸长率分别提高14.1%和16.2%。该研究为镁合金性能优化提供了新思路。”
        ”
        CHEN Zhitang,ZHOU Quan,XIE Dongyuan,CHEN Leping
        Vol. 44, Issue 6, Pages: 814-818(2024) DOI: 10.15980/j.tzzz.2024.06.015
        摘要：Effects of pulse magnetic field on solidification microstructure and mechanical properties of Mg-6Gd-3Y-0.6Zr alloy cast in graphite mold were investigated by OM， SEM， EDS， XRD and tensile testing machine. The results show that pulse magnetic field treatment can refine grain size of the alloy and improve mechanical properties effectively. With the pulse voltage of 300 V， the pulse frequency of 5 Hz and the die preheating temperature of 400 ℃， the grain size of the alloy is reduced by 32.9%， and the tensile strength and elongation of the alloy are increased by 14.1% and 16.2%， respectively. In the range of 200~600 ℃， grain size of the alloy is increased with the increase of die preheating temperature. In the range of 0~300 V， grain size of the alloy is decreased with the increase of pulse voltage. In the range of 0~10 Hz， the grain size of the alloy is decreased at first and then increased with the increase of pulse frequency， and the turning point is 5 Hz. The mechanical properties of the alloy is corresponded to the grain size of the alloy. With the decrease of grain size in the alloy， the mechanical properties are improved.  
        关键词：Pulse Magnetic Field;Mg-6Gd-3Y-0.6Zr Alloy;Solidification Structure;Mechanical Properties   
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      • “最新研究发现，通过调整固溶温度，可显著改善喷射沉积7055铝合金的微观结构和性能。当固溶温度为470℃时，合金展现出最小的第二相面积分数、再结晶分数和晶粒尺寸，为最佳固溶处理工艺。”
        ”
        ZHOU Xiaoxuan,BAI Pucun,HOU Xiaohu,MA Guoxi,ZHAO Xueping,XIONG Peiyou
        Vol. 44, Issue 6, Pages: 819-822(2024) DOI: 10.15980/j.tzzz.2024.06.016
        摘要：Effects of single-stage solution temperature on the second phase， grain size and recrystallization fraction of spray deposited 7055 aluminum alloy were quantitatively investigated by scanning electron microscopy （SEM） and electron backscatter diffraction （EBSD）. The results indicate that the second phase area is 10.3%， the average grain size is 2.5 μm， and the recrystallization fraction accounts for 57.5% in as-extruded alloy. With the increase of solution temperature， the second phase is gradually dissolved back into the matrix with decreasing proportion， and the average grain size and recrystallization fraction are gradually increased. After solution treatment at 460 ℃×2 h， the second phase area is 0.73%， the average grain size is 3.2 μm， and the recrystallization fraction is 76.8%. After solution treatment at 470 ℃× 2 h， the second phase area is 0.57%， the average grain size is 3.8 μm， and the recrystallization fraction is 78.9%. After solution treatment at 480 ℃×2 h， the second phase area is 0.52%， the average grain size is 4.4 μm， and the recrystallization fraction is 80.4%. When the solution treatment process is 470 ℃ × 2 h， the proportion of residual second phase area and recrystallization fraction in the alloy are low with fine grain， which is the optimal solution treatment process.  
        关键词：7055 Aluminum Alloy;Single-stage Solution;EBSD;Second Phase;Recrystallization   
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        Research·Alloy Performance

      • “在铝合金领域，专家建立了TiB2粒子沉淀析出行为模型，模拟分析了粒子形核、长大过程，为获得细小、分布集中的TiB2粒子提供解决方案。”
        ”
        YANG Linjie,ZHANG Lili,ZHAO Jiuzhou,JIANG Hongxiang,HE Jie
        Vol. 44, Issue 6, Pages: 823-829(2024) DOI: 10.15980/j.tzzz.2024.06.017
        摘要：Effects of reaction temperature and supersaturation on precipitation behavior of TiB2 particles in aluminum alloy melt were experimentally investigated. A model was proposed to describe the precipitation behavior of TiB2 particles in the aluminum alloy melt. The nucleation and growth behavior of TiB2 particles and effects on the size distribution were analyzed. The results indicate that the precipitation behavior and size distribution of TiB2 particles are closely related to the reaction temperature， supersaturation and cooling rate of the melt. Lower reaction temperature and high cooling rate are beneficial to obtain finer TiB2 particles with concentrated distribution.  
        关键词：TiB2 Particles;Nucleation;Growth;Size Distribution;Simulation   
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      • “最新研究揭示了多元Sn基钎料合金的微观组织和性能，发现随着混合熵值的增加，合金的硬度和耐腐蚀性能得到提升，且具有较低的熔点和电阻率，为高温无铅软钎料的应用提供了新选择。”
        ”
        FAN Jianglei,WANG Jiaojiao,WANG Ningge,WU Shen,ZHOU Xiangkui,LI Ying,WANG Yan
        Vol. 44, Issue 6, Pages: 830-836(2024) DOI: 10.15980/j.tzzz.2024.06.018
        摘要：Taking Sn as base alloy， a multi-component Sn-based solder alloy was melted and alloyed with different elements， and the variation law of microstructure and properties of Sn-Cu-Ni-Sb-Bi alloy with mixing entropy was investigated. The results reveal that the microstructure of solder alloy is composed of solid solution and precipitated Cu3Sn， Ni3Sn4 and Sn-Sb phase. With the increase of mixing entropy value， the solid solution content in solder alloy is gradually increased， and Sn matrix content is gradually decreased， with the increase of hardness， which reaches the maximum of 287 HV0.5 and 81.8 HB. The tensile strength is firstly increased and then decreased， reaching the maximum of 65.6 MPa at medium entropy composition， and the corrosion resistance presents a trend of gradual enhancement. The melting point range of solder alloys is 141~251 ℃， and the resistivity is ranged from 0.101 to 0.87 μΩ·m， indicating that the high-entropy composition of Sn20Cu20Ni20Sb20Bi20 solder alloy is suitable for using as high-temperature lead-free soft solder.  
        关键词：Lead-free Solder;High Entropy Alloy;Microstructure;Mechanical Properties   
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      • “最新研究揭示了通过调整合金成分，可有效改善商业镁合金的热导率问题。研究团队通过添加La、Ce等元素，优化了Mg-RE二元体系及Mg-Mn-La（Ce）体系的散热性能，为镁合金在高性能散热领域的应用提供了新思路。”
        ”
        YANG Zhenghua,HE Wei,HU Wenxin,LI Yuan,LIU Feng
        Vol. 44, Issue 6, Pages: 837-843(2024) DOI: 10.15980/j.tzzz.2024.06.019
        摘要：Aiming at the problem of low thermal conductivity of traditional commercial magnesium alloys， the composition of rare earth magnesium alloys was desgined. The effects of solid solubility of La and Ce and size， distribution and volume fraction of the second phase in the microstructure of magnesium alloy on the heat dissipation performance of Mg-RE binary system and Mg-Mn-La（Ce） system were investigated. The results show that the thermal conductivity of the as-cast and solid-solution Mg-La （Ce） binary alloy are decreased gradually with the increase of element content. The thermal conductivity of Mg-La （Ce） binary alloy after solution treatment is higher than that of as-cast alloy.Ce addition is helpful to refine the microstructure of as-cast Mg-0.5Mn alloy， and the volume fraction of Mg12Ce phase is increased with the increase of Ce content. The thermal conductivity of as-cast Mg-0.5Mn-xCe alloy is increased with the increase of temperature. At the same time， the thermal conductivity of as-cast Mg-0.5Mn alloy at room temperature is gradually decreased with the increase of Ce addition， and the decline rate is gradually retarded due to the precipitation of Mg12Ce phase.  
        关键词：Magnesium Alloy;Rare Earth La;Ce;Mechanism   
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        Application·Die Casting

      • “在铝合金缸盖低压铸造领域，专家运用MAGMA软件模拟分析，通过正交试验优化工艺，提高铸件内部致密性，为提升产品品质提供解决方案。”
        ”
        TAN Yi,JIANG Lizhen,LIU Zhenwei,LU Jianneng
        Vol. 44, Issue 6, Pages: 844-847(2024) DOI: 10.15980/j.tzzz.2024.06.020
        摘要：Aiming at the characteristics of single-cylinder aluminum alloy cylinder head of motorcycle engine， such as compact structure， uneven wall thickness and complex sand core shape， the mold structure and design characteristics of aluminum alloy cylinder head were analyzed， and MAGMA software was used to simulate and analyze the influence of temperature， pressure and cooling rate on solidification structure. The occurrence of gas-entrapment， hot spot and combustion chamber in the key positions of cylinder head casting was investigated through the simulation of the solidification crystallization process of casting. The orthogonal experimental method was used to simulate and compare the processing factors of the interacted effect of cylinder head low-pressure casting process， and the weight influencing factor was found out for the fine control of the key to realize the preset solidification sequence of low-pressure casting， improving the internal solidification and crystallization density of aluminum alloy cylinder head castings and the production quality of low-pressure casting.  
        关键词：Motorcycle Cylinder Head;Process Factors;Orthogonal Test;Simulation Optimization   
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      • “最新研究揭示了常规压铸铝合金在散热和汽车结构件领域的应用特点，以及高真空压铸技术在新型合金工艺问题解决中的关键作用。”
        ”
        Song Chengmeng,Hou Dongfeng,Wang Jian,Zhu Juanjuan
        Vol. 44, Issue 6, Pages: 848-852(2024) DOI: 10.15980/j.tzzz.2024.06.021
        摘要：The alloy grade characteristics and application scenarios of conventional die-casting aluminum alloys domestic and overseas were collected. The product characteristics and aluminum alloy composition characteristics of die-casting aluminum alloys in the field of heat dissipation were reviewed. The development trend of automotive structural components and die-casting materials leads to the direction of low alloying in die-casting aluminum alloys. High vacuum die-casting technology is becoming important means to solve the problems of new alloy processes.  
        关键词：Die-Casting Aluminum Alloy;Integrated Die-cast Aluminum Body;High Vacuum Die Casting   
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      • “在新能源汽车车载充电器壳体领域，专家通过模具设计、CAE分析及缺陷预测，成功预测并解决了生产中的强度、气密性问题，为行业发展提供了有效解决方案。”
        ”
        WU Hanchao,LIU Lijun,JIA Zhixin,LI Jiqiang,PAN Shuguang
        Vol. 44, Issue 6, Pages: 853-857(2024) DOI: 10.15980/j.tzzz.2024.06.022
        摘要：Aimng at the complex process， high strength and air tightness requirements of the new energy vehicle on-board charger shell， die design， CAE analysis and defect prediction for the housing were carried out. The finite element mesh was established in Hypermesh， and then the flow filling of the model， heat balance and temperature field of die casting mold were analyzed by ProCAST， and X-ray flaw detection was performed on the product. The results indicate found that the defects predicted by CAE analysis can be matched with actual defects.  
        关键词：Aluminum Alloy;Die Casting Mold;CAE Analysis;Car Charger Housing   
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        Application·Investment Casting

      • “最新研究进展：采用镶铸法与精密铸造技术成功制备带细长孔钛合金试样，通过组织分析和微观检测，发现随着镶铸比增大，界面熔合效果显著提升，酸洗工艺可有效浸除。”
        ”
        SUN Bing,HAN Yunfei,QIAO Haibin,SUN Hongzhe,CHEN Yazhen,MU Jianwen,LI Bobo
        Vol. 44, Issue 6, Pages: 858-861(2024) DOI: 10.15980/j.tzzz.2024.06.023
        摘要：Titanium alloy slender hole specimens were prepared by inlay casting + investment casting， and microstructure analysis， micro-morphology and chemical composition were carried out to investigate morphology and structural characteristics of the inlay cast interface bonding under different inlaying ratio and analyze the leaching effect of pickling on cast tube. The results indicate that the slender holes of inlay cast specimens can be formed completely， and the fusion effect of inlaid interface is desirable with the increase of inlaying ratio. When the inlay ratio reaches 20∶1， a fine and dense mesh fusion layer is distributed on the interface， which can be completely removed by pickling process.  
        关键词：Titanium Alloy;Inlay Casting Method;Slender Hole   
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        Application·Lost Foam Casting

      • “在3D打印消失模铸字领域，采用SLA技术实现信息互通，提升生产效率，降低成本，缩短周期，增强企业竞争力，市场前景广阔。”
        ”
        CHEN Jianhua,CHEN Dong
        Vol. 44, Issue 6, Pages: 862-864(2024) DOI: 10.15980/j.tzzz.2024.06.024
        摘要：Through the comparison of various 3D printing lost foam casting solutions， SLA 3D printing lost foam casting was adopted to achieve information exchange across the entire production line， improving production efficiency， reducing production costs， shortening production cycles， increasing enterprise benefits， and enhancing core competitiveness， which exibits bright market application prospects.  
        关键词：SLA Photocuring;Lost Foam Castings;Foam Words   
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