最新刊期
      卷 44 ， 期 5 ， 2024

        Current Recommendation

      • “在镁合金领域，研究人员通过添加Ti-Al中间合金，成功实现了AZ91D镁合金晶粒的细化和腐蚀性能的提升。当Ti含量为0.1%时，晶粒尺寸显著减小，腐蚀质量损失速率降低。然而，过量添加Ti元素并不能进一步改善合金性能。这一发现为镁合金的微观组织控制和性能优化提供了重要参考。”
        ”
        Yang Xiangjie,Deng Boyan,Zou Weifeng,Gong Mengqi
        Vol. 44, Issue 5, Pages: 577-581(2024) DOI: 10.15980/j.tzzz.2024.05.001
        摘要：Ti-Al intermediate alloy was prepared using pure Al and Ti as raw materials by vacuum melting furnace under argon atmosphere. XRD， OM and SEM were utilized to systematically investigate effects of Ti-Al intermediate alloy contents on grain refinement and corrosion performance of AZ91D magnesium alloy. The results indicate when Ti content is 0.1%， the average grain size of AZ91D is decreased from 307 μm to 86 μm， and the corrosion weight loss rate is decreased from 0.781 7×10-4 g/（cm2·h） to 0.321 4×10-4 g/（cm2·h）. Nevertheless， excessive addition of Ti （>1%） cannot further refine the grain size or improve the corrosion resistance of the AZ91D alloy.  
        关键词：Ti-Al Intermediate Alloy;Microstructure;Refine Grain;Corrosion Resistance   
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      • “在镁液输送领域，研究人员设计了水力学模拟试验装置，通过物理模拟试验研究了气体压力、加压时间对水输送量的影响，建立了定量输送的数学模型。根据相似性原理，设计开发了镁液定量输送装置，并确定在气压恒定前提下进行加压时间控制，以实现镁液定量输送。结果表明，基于定时定量法可实现定量输送，输送过程平稳无飞溅，修正后的定量输送预测模型的平均预测误差为1.5%，满足定量输送的要求。”
        ”
        Zhou Jiming,Geng Zhaowei,Liao Kuo,Chen Baolin,Li Xiaobo,Qi Lehua
        Vol. 44, Issue 5, Pages: 582-586(2024) DOI: 10.15980/j.tzzz.2024.05.002
        摘要：In order to realize the pneumatic quantitive conveying of liquid magnesium， a hydraulic simulation device was designed. The influences of gas pressure and pressurization time on the hydraulic conveying volume were investigated by physical simulation， and mathematical model for controlling the conveying volume was established. According to the similarity principle， the magnesium alloy conveying apparatus was designed to achieve the quantitative conveying of liquid magnesium by controlling the pressurization time under constant pressure. The results indicate that quantitative conveying is realized based on timing quantitative method without splashing during the conveying process， and the average error of revised prediction model is 1.5%， meeting the requirements of quantitive conveying.  
        关键词：Magnesium Alloy;Quantitative Conveying;Hydraulic Simulation Experiment;Automation   
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        发布时间：2024-05-27

        Experimental Invsetigation

      • “在铜基粉末冶金材料领域，采用粉末冶金热压烧结工艺制备了不同Cr-Fe粒度的材料，并通过摩擦磨损测试，研究了Cr-Fe粒度对材料性能的影响。结果表明，当Cr-Fe粒度为100目时，材料的摩擦磨损性能最佳。”
        ”
        Xu Qin,Zhang Chi,Fan Jianglei,Liu Jianxiu
        Vol. 44, Issue 5, Pages: 587-590(2024) DOI: 10.15980/j.tzzz.2024.05.003
        摘要：Copper-based powder metallurgy materials with different Cr-Fe particle sizes was fabricated by powder metallurgy hot pressing sintering process， and friction and wear tests at different brake speeds were carried out. The influence of Cr-Fe particle size on microstructure， relative density， mechanical properties and friction properties of the alloy was investigated. The results indicate that Cr-Fe particles are uniformly distributed in the matrix under different particle sizes. With the increase of Cr-Fe particle size， the structure continuity of copper-based powder metallurgy friction materials becomes worse. The hardness and sintered relative density are increased at first and then decreased， and the friction coefficient is firstly increased and then decreased. With the increase of braking speed， the friction coefficients are gradually reduced， and the wear rate is gradually increased. The friction and wear properties of copper-based powder metallurgy materials are desirable with the Cr-Fe particle size of 100 mesh.  
        关键词：Friction Materials;Powder Metallurgy;Cu Matrix;Friction and Wear   
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        发布时间：2024-05-27

        Research·Review

      • “在航天航空、汽车制造领域，铝/钢双金属复合材料的研究进展备受关注。专家们通过不同元素的热浸镀法、增加磁场及添加超声波振动等方法，强化了复合材料的界面结合。同时，对中间相的形成长大及其影响因素，以及中间相的种类、分布对复合材料性能的影响进行了深入探讨。这些研究为铝/钢双金属复合材料的未来发展提供了新思路和方向。”
        ”
        Yang Guang,Zhao Shuming,Zhong Liang,Chen Dahui,Zhuang Xinpeng,Zhu Xiurong
        Vol. 44, Issue 5, Pages: 591-597(2024) DOI: 10.15980/j.tzzz.2024.05.004
        摘要：Al/steel bimetallic composites exhibit broad application prospect in the fields of aerospace and automobile manufacturing， and strengthening of composites is the research focus and difficulty. The research status of interface strengthening of aluminum/steel bimetallic composites at home and abroad was summarized， including hot dip plating with different elements， applying magnetic field and applying ultrasonic vibration. The composite mechanism was reviewed， including the formation and growth of mesophase as well as influencing factors， and effects of type and distribution of mesophase on the properties. Finally， the future research direction of aluminum/steel bimetallic composites was prospected.  
        关键词：Solid-Liquid Compound;Al/steel Bimetal;Compound Mechanism;Interface Strengthening   
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      • “最新研究进展显示，铜基电触头材料在中高压开关领域取得显著成果，Cu-Cr、Cu-W和Cu-氧化物触头材料备受关注。通过分析制备工艺，比较不同研究方法，为铜基触头材料的表面改性和多组元微合金化发展指明方向。”
        ”
        Xia Chunyong,Yang Changlong,Duo Junlong,Dou Zhihe,Zhang Ting'an,Han Jinru,An Wang
        Vol. 44, Issue 5, Pages: 598-604(2024) DOI: 10.15980/j.tzzz.2024.05.005
        摘要：The research progress in Cu-based electrical contact materials was reviewed， and the development process and classification of Cu-based contact materials for medium and high-voltage vacuum switches were introduced and analyzed， focusing on Cu-Cr， Cu-W， and Cu-oxide contacts. The preparation process was further analyzed， and the advantages and disadvantages of different research methods were compared. Finally， it is concluded that the surface modification treatment and multi-component microalloying are regarded as development direction of Cu-based contact materials and preparation process.  
        关键词：Cu-based Electrical Contact Materials;Surface Modification;Microalloying   
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        Research·Computer Application

      • “在铝铸件X射线探伤图像领域，研究人员设计了基于特征提取算法的铸件缺陷评级系统，通过分析特征参数与缺陷级别间的关系，选择面积作为评级指标，并建立缺陷评级量化体系。该系统能自动进行X射线图像预处理、边缘检测、轮廓提取和量化计算，实现自动缺陷评级，与专家评片结果存在±1级的误差，为保证铸件品质监测提供解决方案。”
        ”
        Wu Chuhao,Hou Mingjun,Li Meng,Ji Xiaoyuan,Fang Yu,Sun Xiaolong,Li Qinyang,Dong Hao,Li Ning,Zhou Jianxin
        Vol. 44, Issue 5, Pages: 605-613(2024) DOI: 10.15980/j.tzzz.2024.05.006
        摘要：Aiming at the problems of unstable rating results and difficulty in quantification existing in artificial defect rating technology for aluminum casting X-ray flaw detection images， a casting defect rating system based on feature extraction algorithm was designed. Firstly， the area was selected as the rating index of pores， inclusions， shrinkage holes and shrinkage by analyzing the relationship between the characteristic parameters and the defect level， and the defect rating quantitative system was established according to the national standard map. Then， the X-ray images were preprocessed， edge-detected， contoured and quantified， and rated according to the established system. Finally， an automatic defect rating system integrating the above functions was developed， which possesses an error of ±1 level with the expert evaluation results after verification. In conclusion， the system can ensure the rating quality to a certain extent， which is convenient for the quality monitoring of castings.  
        关键词：Aluminum Castings;X-ray Images;Defect Rating;Image Processing;Feature Extraction   
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      • “在铸造模拟仿真领域，专家提出了一种基于边界网格投影的网格剖分方法，通过读取STL文件、结构化网格剖分、内外网格区分和投影处理，成功生成贴合铸件形状的网格文件，为提升铸造CAE模拟精度提供解决方案。”
        ”
        Cui Yuwei,Zhao Yuhong,Pei Xiaolong,Pan Yue,Hou Hua
        Vol. 44, Issue 5, Pages: 614-619(2024) DOI: 10.15980/j.tzzz.2024.05.007
        摘要：A casting simulation grid generation method based on boundary grid projection was proposed. Firstly， the STL file of 3D model of casting was read and defects were processed. Then， the castings were structurally gridded， and the internal and external grids were distinguished to obtain the boundary grid. Finally， the boundary grid was projected. Application instances indicate that the method leads to a grid file that fits the shape of 3D model， which is of significance for improving the accuracy of casting CAE.  
        关键词：Casting Numerical Simulation;Structured Grid Generation;Boundary Grid;Projection Processing   
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        Research·Additive Manufacture

      • “在铝合金电弧增材制造领域，研究者采用CMT焊机4种工作模式，通过单层单道成形和多层单道成形制备试样，分析了工作模式对微观组织和力学性能的影响。结果表明，CMT-Pulse+Advanced模式制备的试样晶粒细小均匀，气孔率最低，抗拉强度各向异性最小，为铝合金电弧增材制造提供了优化方案。”
        ”
        Liang Fuyuan,Xing Pengfei,Wu Mengwu
        Vol. 44, Issue 5, Pages: 620-626(2024) DOI: 10.15980/j.tzzz.2024.05.008
        摘要：Different working modes of CMT welding machine were utilized to investigate the single-layer and single-pass forming of 4043 aluminum alloy by wire and arc additive manufacturing process， and single-wall specimens were prepared by multi-layer and single-pass forming. Effects of working mode on microstructure and mechanical properties of specimens were analyzed. The results indicate that the high residual height coefficient in CMT-pulse mode leads to desirable spreadability， while the lower residual height coefficient in the CMT-Advanced mode leads to poorer spreadability. The CMT working mode has a significant impact on the microstructure， porosity， and mechanical properties of specimens. The grain in specimens fabricated by CMT-pulse+advanced mode is finer and more uniform， with a minimum percentage of 4.88%， where the transverse and longitudinal tensile strength of the single-wall specimens are 148 MPa and 138 MPa， respectively， which are higher than those in the rest CMT modes， and a minimum tensile strength anisotropy of 6.8% is also obtained.  
        关键词：4043 Aluminum Alloy;WAAM;Welding Bead Morphology;Mechanical Properties   
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        Research·Composites

      • “最新研究进展显示，通过压力渗流法成功制备了Si/Al复合材料，其相组成为Si相和α-Al相。研究发现，Si含量、Si粉粒径和热压处理对材料的热导率和热膨胀系数有显著影响。通过优化这些参数，可实现热导率最高达136 W/（m·K）和热膨胀系数最低为7.75×10^-6 K^-1。此外，600℃热压处理后，复合材料的热导率和热膨胀系数均有所提高。这一研究为高性能Si/Al复合材料的开发提供了重要指导。”
        ”
        Zhu Xuwei,Jin Yunxue,Zhou Canxu,Liu Yuan
        Vol. 44, Issue 5, Pages: 627-632(2024) DOI: 10.15980/j.tzzz.2024.05.009
        摘要：Si/Al composites with Si volume fraction of 62.1% to 75.6% were prepared by pressure seepage method， and effects of content and particle size of Si powder in Al matrix and hot-pressing treatment on the microstructure and properties of the composites were investigated. The results indicate that the microstructure of prepared Si/Al composites consists of Si phase and α-Al phase， and the thermal conductivity and thermal expansion coefficient are decreased with the increase of Si volume fraction or reduction of Si particle size， which reach the maximum value of 136 W/（m·K） and the mininum value of 7.75×10-6 K-1， respectively. After hot-pressing at 600 ℃， the sharp corners of the primary Si are obviously passivated， where the thermal conductivity is increased from 119 W/（m·K） to 125 W/（m·K）， and the coefficient of thermal expansion is increased from 8.28×10-6 K-1 to 8.73×10-6 K-1.  
        关键词：Si/Al Composites;Pressure Seepage Method;Hot Pressing   
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        Research·Alloy Performance

      • “最新研究揭示，AZ91D镁合金在挤压态下的耐腐蚀性能优于固溶态，而时效处理后的挤压态合金耐腐蚀性能更佳。固溶处理使β-Mg17Al12相溶解于α基体，挤压过程中大量β相沿晶界析出。Al元素提高腐蚀电位，降低腐蚀倾向，时效处理消除残余应力，使β相分布均匀，进一步提升耐腐蚀性能。”
        ”
        Fu Guangyan,Yang Longfei,Xue Feng
        Vol. 44, Issue 5, Pages: 633-636(2024) DOI: 10.15980/j.tzzz.2024.05.010
        摘要：The microstructure of solid solution， as-extruded AZ91D and aged-extruded AZ91D magnesium alloy was analyzed by optical microscopy， electron microscopy and XRD. AZ91D magnesium alloy in the as-cast， solid solution， and extruded states was analyzed through potential polarization， salt spray corrosion， and immersion corrosion weight loss experiments. The results indicate that the corrosion resistance of extruded AZ91D magnesium alloy is superior to that of solid solution ones， and that of extruded AZ91D magnesium alloy after aging treatment is better than that of extruded ones. After solid solution treatment， β-Mg17Al12 phase is continuously dissolved into α matrix to form the supersaturated solid solution， and a large amount of β phases are precipitated from supersaturated solid solution α phase in the solid solution AZ91D magnesium alloy during the hot extrusion process， which are distributed along grain boundaries. Corrosion resistance of as-extruded AZ91D is improved as a result of Al increasing the corrosion potential of magnesium alloys， reducing corrosion tendency to delay the corrosion rate. The aging process can eliminate residual stresses that occurs in the material during hot extrusion， resulting in the more uniform distribution of β-Mg17Al12 phase along grain boundaries， further improving the corrosion resistance of AZ91D magnesium alloy.  
        关键词：Magnesium Alloy;Heat Treatment;Extrusion;Microstructure;Corrosion Resistance   
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      • “在非晶合金领域，研究人员采用铜模喷铸法制备了Zr65-xTixCu20Fe5Al10合金，通过多种仪器分析了Ti含量对合金非晶形成能力和力学性能的影响。结果发现，当x=2时，合金展现出优异的非晶形成能力和力学性能，为非晶合金研究提供了新方向。”
        ”
        Wei Jie
        Vol. 44, Issue 5, Pages: 637-640(2024) DOI: 10.15980/j.tzzz.2024.05.011
        摘要：The bulk Zr65-xTixCu20Fe5Al10（x=0， 2， 4， 6， 8） alloys with ϕ2 mm were prepared by injection copper mold casting. Effects of Ti addition on the amorphous forming ability and mechanical properties of Zr65-xTixCu20Fe5Al10（x=0， 2， 4， 6， 8） alloy system were investigated by X-ray diffraction， differential scanning calorimeter， compression tests and scanning electron microscope. The results indicate that the alloy achieves optimal amorphous forming ability when x=2， where the supercooled liquid zone ΔTx， the reduced glass transition temperature Trg， the amorphous forming capacity parameter γ， the compressive strength， and the plastic deformation are 73 K， 0.564， 0.401， 1 905 MPa and 12%， respectively， and the compressive strength and plastic deformation ability are desirable， which is attributed to the formation of a large number of shearing bands.  
        关键词：Zr-based Amorphous Alloy;Amorphous Forming Ability;Mechanical Properties   
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      • “在镁合金锭重熔领域，研究揭示了气体精炼时间、熔体过热保温温度和时间对合金微观组织与力学性能的影响，以及合金的组织遗传性。最优化条件为760℃过热保温、3分钟气体精炼和40分钟保温时间，可提高合金强度；而800℃保温60分钟则有助于弱化合金遗传性。”
        ”
        Dong Hanwu,Ye Xiaozhou,Luo Suqin,Zhan Jun
        Vol. 44, Issue 5, Pages: 641-646(2024) DOI: 10.15980/j.tzzz.2024.05.012
        摘要：Microstructure and mechanical properties of prefabricated ingots were analyzed. Effects of the time of gas refining， the temperature and holding time of overheating insulation were analyzed. The results indicate that the Nd content is burned after remelting. The affecting sequence of parameters on strength of the alloy ingot is over-heating holding temperature， degassing time and holding time， of which optimized values are 760 ℃， 3 min and 40 min， and affecting sequence on the elongation are over-heating holding temperature， holding time and degassing time， of which optimized values are 760 ℃， 60 min and 3 min. The heredity of the alloy can be weakened holding at 800 ℃， and the optimized holding time is 60 min.  
        关键词：ZM6 Magnesium Alloys;Prefabricated Ingots;Remelting;Microstructure;Mechanical Properties   
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      • “在镁合金高压压铸件领域，研究人员通过三维重构和二维表征，揭示了工艺参数、微观结构与力学性能之间的联系。研究表明，铸造压力的提高可显著降低心部孔隙率，而撕裂脊主要由压室预结晶的滑移带演化而来。这一发现为优化镁合金压铸工艺提供了重要指导。”
        ”
        Li Junjie,Ma Chaosheng,Zhang Tongtong,Yu Wenbo,Xiong Shoumei
        Vol. 44, Issue 5, Pages: 647-655(2024) DOI: 10.15980/j.tzzz.2024.05.013
        摘要：To understand the relationship between process-microstructure-mechanical properties of AE44 magnesium alloy high-pressure die castings，three-dimensional reconstruction and two-dimensional characterization were performed on high-pressure die castings produced under different process parameters. The microstructure characterization indicates that the formation of shrinkage pores is closely related to ESCs， which is mainly controlled by low and slow injection rates in the compression chamber and fast and slow injection rates. Casting pressure can significantly reduce the porosity of the core by increasing the feeding capacity of liquid metal. The simulation of the filling process shows that the central position of the bar sample is filled firstly，followed by the position near the gate，and accompanied by a strong turbulence. The tensile fracture indicates that the tearing ridges mainly evolve from the slip bands of ESCs. The quantity and distribution of ESCs determine the fracture behavior of castings.  
        关键词：AE44 Magnesium Alloy;High-pressure Die-casting;3D Reconstruction;ESCs;Fracture Behavior   
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      • “在材料科学领域，研究人员通过热模拟试验，对Al2O3弥散铜烧结坯流变应力进行修正，建立了基于双曲正弦本构关系Arrhenius流动应力模型的本构方程，提高了模型的精度。”
        ”
        Xiao Zhenpeng,Li Shaolin,Jia Shuguo,Guo Xiuhua,Wang Xu,Liu Song,Song Kexing
        Vol. 44, Issue 5, Pages: 656-662(2024) DOI: 10.15980/j.tzzz.2024.05.014
        摘要：The flow stress of Al2O3 dispersed copper sintered billet was modified to accurately describe the thermal deformation behavior. The thermal modeling test was conducted to obtain flow stress curve under the condition of deformation temperature of 923 K~ 1 223 K and strain rate of 0.01 s-1 ~ 10 s-1. The flow stress was modified by friction and temperature correction principle， and the constitutive equations of Arrhenius flow stress model based on the hyperbolic sine constitutive relation were established and the error analysis was carried out. The results indicate that the effects of friction and temperature rise on the flow stress are gradually significant with the decrease of deformation temperature and the increase of strain rate. The quantitative descriptions of each influencing factor on correction of friction and temperature rise effects were constructed through data fitting. Based on modified flow stress data， the constitutive equation was established， where the average error is decreased from 9.11% to 5.20%， and the correlation coefficient is increased from 0.957 35 to 0.997 56， verifying the accuracy of constitutive equation.  
        关键词：Flow Stress Curve;Friction Correction;Temperature Correction;Al2O3 Dispersed Copper   
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      • “最新研究发现，原位TiB2颗粒的引入显著提升了Al-Si合金的耐热性能和力学性能，为航空航天等领域的应用提供了新的解决方案。”
        ”
        Zhao Haoyu,Jiang Hongxiang,Li Shixin,Zhao Jiuzhou,Zhang Lili,He Jie
        Vol. 44, Issue 5, Pages: 663-668(2024) DOI: 10.15980/j.tzzz.2024.05.015
        摘要：Al-Si alloys have been widely used in fields such as aerospace and transportation due to the excellent castability， corrosion resistance， and desirable mechanical properties. In recent years， with the continuous development of technology， higher requirements have been put forward for the heat resistance performance of Al-Si alloys. Effects of in-situ TiB2 particles on microstructure and properties of AlSi10Mg alloy at room temperature and high temperature were investigated. The results indicate that the introduction of in-situ TiB2 particles can not only act as the heterogeneous nucleation of α-Al to refine the matrix grains， but also inhibit the growth of eutectic Si， modifying eutectic Si. Furthermore， the tensile strength， yield strength， and elastic modulus of the alloy are increased with the increase of TiB2 particle content. After adding 10% TiB2 particles， the tensile strength， yield strength， and elastic modulus of the alloy at room temperature （24 ℃） are increased from 155 MPa， 103 MPa， and 75.2 GPa to 206 MPa， 133 MPa， and 89.3 GPa， respectively. The tensile strength， yield strength， and elastic modulus of the alloy are increased from 112 MPa， 70 MPa， and 68.5 GPa to 137 MPa， 89 MPa， and 81.2 GPa at 200 ℃， respectively.  
        关键词：Aluminum Alloy;In-situ TiB2 Particles;Mechanical Properties;Elastic Modulus   
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        发布时间：2024-05-27

        Research·Alloy Process

      • “在铝合金材料研究领域，科学家们通过高真空压铸技术制备了不同铜含量的AlSi10CuMgMn合金，并利用光学显微镜、扫描电镜和透射电镜对其微观组织进行了深入研究。研究发现，随着铜含量的增加，合金中的θ相数量逐渐增多，形貌也由分散的粒状转变成聚集的块状。此外，T5热处理不会改变合金中相的类型和形貌，而峰值时效时主要析出相为β″和θ′相。这一研究为铝合金材料的性能优化提供了重要参考。”
        ”
        Liu Jinhui,Zhao Haidong,Gao Junmin,Li Shihua,Hou Xiaohua
        Vol. 44, Issue 5, Pages: 669-674(2024) DOI: 10.15980/j.tzzz.2024.05.016
        摘要：Al-10Si-Cu-Mg-Mn alloys with different Cu contents were prepared by high vacuum die casting process. The microstructure of as-cast and T5 alloys were investigated by OM， SEM and TEM. The results indicated that the microstructure of as-cast alloys consists of α-Al， eutectic Si and α-Fe， Q and θ phases. With the increase of Cu content， the number of Q phase keeps stable， and the morphology is mainly lamellar. The amount of θ phase is gradually increased， and the morphology is changed from dispersed granular to aggregated blocky. T5 heat treatment cannot change phase types and morphology， and the main precipitated phases are β″ and θ′ phases at peak aging condition. With a lower Cu contents， the precipitated phase is dominated by β″ and at higher Cu contents， the precipitated phase is dominated by θ′.  
        关键词：Al-10Si-Cu-Mg-Mn Alloy;High Vacuum Die Casting;T5 Heat Treatment;Microstructure   
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        发布时间：2024-05-27
      • “最新研究发现，适量添加Mn元素可显著提升Al-10Si-5Cu合金的力学性能。当Mn含量为0.40%时，合金抗拉强度和显微硬度分别达到285 MPa和128，热处理后耐磨性能最佳。”
        ”
        Sun Wei,Wan Hao,Ma Haijuan,Wei Chao,Li Yushan,Si Naichao
        Vol. 44, Issue 5, Pages: 675-678(2024) DOI: 10.15980/j.tzzz.2024.05.017
        摘要：Effects of Mn addition on microstructure and mechanical properties of Al-10Si-5Cu alloy and wear resistance of Mn alloyed specimens under different heat treatment conditions were investigated by metallographic analysis， tensile test， microhardness test and wear test. With the increase of Mn addition， the tensile strength and microhardness of alloy is increased firstly and then decreased， while the elongation is decreased. The alloy with 0.40% Mn addition exhibits the desirable tensile strength and microhardness， which are 285 MPa and 128 HV， respectively. Heat treatment can further improve the wear resistance of Mn-alloyed alloy. Among all the specimens， as-aged specimens possesses optimal wear resistance.  
        关键词：Al-Si Alloy;Microstructure;Mechanical Propertyies;Wear Behavior   
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        发布时间：2024-05-27
      • “在材料科学领域，专家利用ANSYS软件对复合铸造球墨铸铁-硬质合金复合辊环的残余应力进行数值模拟，成功制得扩散区宽达6毫米且无缺陷的复合辊环。”
        ”
        Zhang Jianjian,Wang Zhenhu,Yu Mengna
        Vol. 44, Issue 5, Pages: 679-682(2024) DOI: 10.15980/j.tzzz.2024.05.018
        摘要：The residual stress of ductile iron-cemented carbide compound roller ring produced by compound casting was simulated by ANSYS. According to the numerical simulation results， the process parameters were determined as follows： the coating area ratio of ductile iron to hard alloy of 0.344∶1， the cross-sectional area ratio is 0.4∶1， the casting temperature of ductile iron of 1 320 ℃， and the hard alloy preheating temperature of 800 ℃. The compound roller with diffusion zone width of 6 mm without macro and micro defects was successfully prepared.  
        关键词：Compound Roller;Ductile Cast Iron;Residual Stress;Numerical Simulation   
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        发布时间：2024-05-27
      • “在材料科学领域，研究人员通过氧氮氢联测仪对纯铜中氧含量进行测试，发现车制、大力剪、酸洗等制样方式对测试结果影响较小，而手锯、锉刀则会导致较大偏差。对于氧含量极低的试样，推荐采用车制+大力剪+酸洗的制样方法，并在4小时内完成测试以确保结果的准确性。”
        ”
        Feng Dan,Zhang Huilin,Zhang Xi,Han Yi,Qian Weifeng
        Vol. 44, Issue 5, Pages: 683-685(2024) DOI: 10.15980/j.tzzz.2024.05.019
        摘要：The oxygen content in pure copper was tested by oxygen nitrogen hydrogen analyzer to investigate effects of specimen preparation methods on accuracy of oxygen content determination. The results indicate that surface treatment should be carried out before testing by infrared absorption method. Turning， vigorously cutting and pickling hardly affect the results， while hand saw and file can cause significant deviation. Only turning+vigorously cutting+pickling can be adopted for specimens with an oxygen content of <0.001 0%， and the test should be carried out within 4 h to avoid affecting the test results.  
        关键词：Pure Copper;Specimen Preparation Method;Oxygen Content   
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        发布时间：2024-05-27
      • “在铝合金圆棒研究领域，专家通过显微镜等手段，对6061铝合金圆棒的微观组织和锻造轮毂过程进行深入研究。研究发现，降低Fe含量、提高均匀化温度和保温时间，可有效改善组织均匀性，提高轮毂成形性和力学性能。”
        ”
        Xue Guanxia,Zhong Gu,Wang Zheng,Ning Bo,Lin Shipeng,Li Hutian,Ma Ke,Sun Xiaofei,Guo Luobao
        Vol. 44, Issue 5, Pages: 686-691(2024) DOI: 10.15980/j.tzzz.2024.05.020
        摘要：The homogenized microstructure and subsequent forging process of oil and gas slip 6061 aluminum alloy bar with ϕ254 mm by semi-continuous casting were investigated by OM， SEM， EDS and mechanical property test techniques. The results indicate that the quantity， size， and morphology of Fe-rich phase in the segregation layer of the ingot are directly related to forging forming， crack formation and propagation， and mechanical properties of the wheel hub. With Fe content decreasing from 0.32% to 0.22% and homogenization temperature rising from 550 ℃ to 570 ℃， and holding time of 13 h， the Al2Cu phase at R/2 of the ingot is completely dissolved， a small amount of MgSi phase remains， and the AlFeSi phase is intermittently dispersed， where the area fraction of β-AlFeSi and MgSi phase is reduced from 1.08%， 1.11% to 0.73%， 0.67%， respectively. Meanwhile， the aggregation amounts of β-AlFeSi and MgSi phase in the segregation layer are significantly reduced， where the maximum size of β-AlFeSi phase is reduced from 60.2 μm to 29.9 μm， and the area fraction is reduced from 1.57% to 0.89%， reducing the stress concentration in the area around the coarse and brittle β-AlFeSi phase during deformation. At this point， the forged wheel hub exhibits desirable formability， which effectively suppresses the generation of forging cracks. The tensile strength and elongation of the wheel hub are increased from 322 MPa， 10.2% to 378 MPa， 12.2%， respectively.  
        关键词：6061 Aluminum Alloy;Homogenization;Secondary Phase;Forged Wheel Hub;Crack   
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        发布时间：2024-05-27
      • “在材料科学领域，研究人员采用SAM2X5非晶合金粉末在40Cr钢表面制备了无裂纹Fe基非晶复合涂层。通过双层激光熔覆工艺，显著提升了涂层的硬度和耐磨性。当第二层激光扫描速度为1 m/min时，涂层硬度达到852 HV0.1，是基体的3倍，耐磨性也远高于基体。”
        ”
        Zhang Xinyu,Lü Weiyan,Qiu Keqiang,Qu Yingdong
        Vol. 44, Issue 5, Pages: 692-698(2024) DOI: 10.15980/j.tzzz.2024.05.021
        摘要：The crack-free Fe-based amorphous composite coatings were prepared by single-layer and double-layer laser cladding with different scanning rates on the surface of 40Cr steel using SAM2X5 amorphous alloy powder. Effects of double-layer cladding process on microstructure， element distribution， hardness and wear resistance of Fe-based amorphous composite coatings were analyzed. The results indicate that the double-layer cladding of Fe-based amorphous alloy composite coating can enhance the hardness and wear resistance of the coating. In addition， as the laser scanning rate of the second layer increases， the composition dilution of the coating by the substrate is decreased， and the hardness as well as wear resistance of the coating are increased. The hardness of coating reaches the highest at the second laser scanning rate of 1 m/min， with an average hardness of 852 HV0.1， which is about three times of the substrate. The wear resistance of the coating is much higher than that of the substrate， reaching the optimal at the second scanning rate of 1 m/min， where the wear volume is 28% of that of the substrate.  
        关键词：Laser Cladding;Crack-free;Fe-based Amorphous Alloy;Hardness;Wear Resistance   
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        发布时间：2024-05-27
      • “最新研究发现，Al-1Li-0.05Sc合金的抗腐蚀性能受轧制变形量及时效工艺影响。70%形变量试样具有理想抗腐蚀性能，而530℃×24h+285℃×1.5h时效为最佳热处理工艺，可提升硬度并达到最佳抗腐蚀性能。”
        ”
        Guo Haiwei,Luo Zhijian,Zhang Jiayi,Lai Junjie,Ma Zhixuan,Chen Li
        Vol. 44, Issue 5, Pages: 699-703(2024) DOI: 10.15980/j.tzzz.2024.05.022
        摘要：Effects of rolling deformation rate and aging process on corrosion resistance of Al-1Li-0.05Sc alloy were investigated. OM results indicate that the corrosion is characterized by pitting corrosion. The electrochemical performance tests and TEM results reveal that the 70% deformation are crushed into small angle grain boundary under severe deformation amounts due to the high angle grain boundary generated by recovery， achiving desirable corrosion resistance. After peak aging treatment at 255 ℃， a large amount of second phase is precipitated in the alloy， improving the mechanical properties and reducing the corrosion resistance instead. 530 ℃×24 h + 285 ℃×1.5 h aging is the optimal heat treatment， where the mechanical properties of the alloy are greatly improved， and optimal corrosion resistance is obtained after 50% rolling deformation.  
        关键词：Al-1Li-0.05Sc;Corrosion Resistance;Rolling Deformation;Heat Treatment   
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        发布时间：2024-05-27

        Application·Die Casting

      • “在铝合金变速器操纵壳制造领域，专家基于田口方法，通过数值模拟优化铸造参数，成功减少内部铸造缺陷，为工艺优化提供解决方案。”
        ”
        Mao Xuhai,Su Xiaoping,Li Xinyu
        Vol. 44, Issue 5, Pages: 704-707(2024) DOI: 10.15980/j.tzzz.2024.05.023
        摘要：Taking an aluminum alloy trainsmission control house as object， the influence of die preheating temperature， pouring temperature and cooling temperature on the spacing of secondary dendrite arms and the volume of shrinkage cavity and porosity were investigated. Based on the Taguchi method，numerical simulation software was used to optimize the process design of casting parameters， and the optimal process parameters were obtained as follows： casting temperature of 690 ℃， mold preheating temperature of 310 ℃， cooling water temperature of 40 ℃. The optimization process parameters can reduce the casting defects inside the aluminum alloy transmission control housing.  
        关键词：Taguchi Method;Aluminum Alloy Transmission Control Housing;Low Pressure Casting;Numerical Simulation;Process Optimization   
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        发布时间：2024-05-27
      • “在电动助力转向电机壳体铸造工艺领域，专家利用HyperMesh和ProCAST软件建立了有限元模型，模拟分析铸造工艺，预测铸件内部缺陷，并通过试生产和X射线探伤验证了预测结果的准确性。”
        ”
        Ji Xin,Liu Lijun,Jia Zhixin,Li Jiqiang,Liao Dahua,Fang Jie
        Vol. 44, Issue 5, Pages: 708-712(2024) DOI: 10.15980/j.tzzz.2024.05.024
        摘要：Aiming at the complex casting process of the electric power steering motor shell and the high quality requirements， the finite element model was established by the HyperMesh and ProCAST software， the casting process of the electric power steering motor shell was carried out and the location and size of defects inside the castings were predicted. Trial-production was conducted based on the optimized process schme， and X-ray flaw detection observation was carried out for castings. The experimental results indicate that the defect prediction results are consistent with the actual casting， and shrinkage porosity and cavities appear on the lugs and thick walls on both sides of the housing.  
        关键词：Die Casting;Motor Housing;CAE Analysis;Shrinkage Porosity;Cavity   
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        发布时间：2024-05-27

        Application·Investment Casting

      • “在钛合金精密铸造领域，研究者探索了去除ZTC4钛合金铸件表面α层的工艺，以提升铸件的表面品质和力学性能，从而提高产品的整体品质。”
        ”
        Shen Xuanjin,Luo Guojun,Tang Liying,He Tongzheng
        Vol. 44, Issue 5, Pages: 713-716(2024) DOI: 10.15980/j.tzzz.2024.05.025
        摘要：During the producing process of titanium alloy investment castings， the molten titanium alloy is easy to react with the shell， resulting in α-layer with high hardness and low toughness on the surface of castings， which has a negative impact on the surface quality and mechanical properties of titanium alloy castings. The removal process of α-layer on the surface of ZTC4 titanium alloy castings was investigated in order to improve the surface quality and mechanical properties of ZTC4 titanium alloy castings， thus improving the quality of products.  
        关键词：Titanium Alloy;α-Case;Mechanical Property   
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        发布时间：2024-05-27
      • “在材料科学领域，研究人员利用ProCAST软件模拟了Ti-6Al-4V合金的凝固晶粒组织，并通过精密铸造工艺制备试样验证模拟结果。模拟与实验结果一致，晶粒直径模拟与实际吻合率达80%~99%，为合金凝固组织控制提供有效方案。”
        ”
        Cui Xinpeng,Li Feng,Ma Jing,Zhang Qiang
        Vol. 44, Issue 5, Pages: 717-720(2024) DOI: 10.15980/j.tzzz.2024.05.026
        摘要：The CAFE module in ProCAST software was utilized to simulate the solidification grain structure of Ti-6Al-4V alloy， and the step specimen was prepared by investment casting to verify and evaluate the simulation results. The simulation results indicate that the structure presents columnar grains on the surface， which is transformed into equiaxed grains at the center of the casting. The average grain diameter is increased with the increase of wall thickness， and the grain distribution is consistent with the experimental results. The coincidence rate of simulated average grain diameter with the actual results reaches 80%~99%， meeting the engineering application expectation.  
        关键词：Investment Casting;Ti Alloy;CAFE Method;Microstructure Simulation   
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