最新刊期
      卷 44 ， 期 10 ， 2024

        Topic·Composites

      • “在复合材料制备领域，专家提出了一种新型工艺方法，优化了浸渗过程，制备出密度更低、强度更高的复合材料。”
        YUN Kang,LI Xiaobo,ZHOU Jiming,QI Lehua
        Vol. 44, Issue 10, Pages: 1297-1301(2024) DOI: 10.15980/j.tzzz.2024.10.001
        摘要：A method for preparing composites with the cross-sectional area ratio of punch to sheet less than 1 was proposed. The infiltration process was analyzed， and effects of different process parameters on infiltration quality were investigated. The optimized process parameters were presented as follows： pouring temperature of 950 °C， preheating temperature of 560 °C and extrusion pressure of 35 MPa， which were used to prepare well-impregnated ring-shaped thin sheet. The density of fabricated composites is 14.8% lower than that of the matrix alloy， and the tensile strength is 125 MPa， which is 58% higher than that of the matrix.  
        关键词：Liquid-solid Extrusion Infiltration;Carbon Fiber Aluminum Matrix Composite;Sheet;Punch   
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        发布时间：2024-10-23
      • “在新材料领域，研究人员采用接触搅拌法制备了TiCp+TiB2p/ZL205A复合材料，研究了稀土Ce含量对复合材料微观组织和力学性能的影响。结果表明，添加Ce改善了TiCp+TiB2p/ZL205A复合材料中增强颗粒在基体中的分散效果，抑制了复合材料中颗粒的团聚，并细化了晶粒尺寸。稀土含量为0.1%时，颗粒分散均匀性良好，晶粒尺寸细化最明显。挤压后TiCp+TiB2p/ZL205A复合材料的抗拉强度、伸长率分别为426.3 MPa、1.56%，为高性能复合材料研究提供了新思路。”
        FENG Xiang,BAI Yaoyi,LU Dehong
        Vol. 44, Issue 10, Pages: 1302-1306(2024) DOI: 10.15980/j.tzzz.2024.10.002
        摘要：TiCp+TiB2p/ZL205A composites were prepared by contact stirring method using titanium powder， boron carbide powder， aluminum powder and ZL205A as raw materials. Effects of rare earth Ce content on the microstructure and mechanical properties of the composites were investigated. The results indicate that Ce addition can improve the dispersion of reinforcement particles in the matrix of TiCp+TiB2p/ZL205A composites， inhibiting the agglomeration of particles and refining the grain size. When the content of rare earth is 0.1%， the particle is evenly dispersed with desirable refinement effect. The tensile strength and elongation of TiCp+TiB2p/ZL205A composites after extrusion reach 426.3 MPa and 1.56%， respectively.  
        关键词：Aluminum Matrix Composites;Contact Stirring;Microstructure;Mechanical Properties   
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        发布时间：2024-10-23
      • “在材料科学领域，研究人员采用连续固-液复合方法制备了锡青铜/10号钢双金属层状复合材料。通过微观组织分析和力学性能测试，验证了复合材料界面的全冶金结合和优异的结合强度，为解决材料界面结合问题提供新方案。”
        PENG Bo,YU Fengyun,DENG Jia'nan,JIE Jinchuan,LI Tingju
        Vol. 44, Issue 10, Pages: 1307-1312(2024) DOI: 10.15980/j.tzzz.2024.10.003
        摘要：Tin bronze （TB）/1010 steel bimetal laminated composites were prepared using continuous solid-liquid bonding method. Microstructure and interfacial bonding mechanism of the composites were analyzed by optical microstructure （OM）， electron probe microanalysis （EPMA） and transmission electron microscope （TEM）. The mechanical properties and interfacial bonding strength of composites were investigated by hardness and tensile-shear tests， respectively. The results indicate that microstructure of the tin-bronze is homogeneous， while a complex microstructure of ferrite + pearlite + bainite are formed in steel due to the complex temperature field during the cooling process. The composites exhibit excellent interfacial bonding properties， realizing the completely metallurgical bonding. TEM results reveal that a strong interatomic bonding interface is generated between tin bronze and 1010 steel. The tensile-shear test results demonstrate that the final fracture occurs on the tin-bronze side， and the bonding strength of the interface is higher than that of tin-bronze.  
        关键词：Solid-liquid Bonding;Tin Bronze;Bimetal Composite Plate;Interface;Tensile-shear   
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        发布时间：2024-10-23
      • “在材料科学领域，研究者通过液/固复合铸造法制备A356/Q345双金属复合材料，发现液/固体积比对材料界面组织特征、厚度、相组成及力学性能有显著影响。当液/固体积比为9.93时，复合材料的综合力学性能最佳。”
        LIANG Xiaoyu,LI Yuandong,QIU Jin,ZHANG Ning,ZHOU Hongwei,WANG Sheng,CAO Chi
        Vol. 44, Issue 10, Pages: 1313-1319(2024) DOI: 10.15980/j.tzzz.2024.10.004
        摘要：Q345 steel was hot-dip plated with A356 aluminum alloy at 700 ℃， and A356/Q345 bimetallic composites were prepared by liquid-solid compound casting. Effects of liquid/solid volume ratio （5.54， 6.91， 9.93， 13.3） on the microstructure characteristics， thickness， phase composition and mechanical properties of A356/Q345 composites were investigated. The results reveal that a descirable metallurgical bond layer is formed at the interface， and the thickness of bonding layer is increased from 17.18 μm to 22.04 μm with the increase of liquid/solid volume ratio， which are mainly composed of Al9Fe2Si2， Al8Fe2Si and Al5Fe2 phases. The microhardness of aluminum matrix and steel matrix remains basically stable， while that of bonding layer is increased slightly with the increase of liquid/solid volume ratio. The average microhardness of bonding layer is 356.89 HV， which is far higher than that of aluminum matrix and steel matrix. The tensile strength and shear strength of composites are increased firstly and then decreased， reaching the maximum value of 351.4 MPa and 48.3 MPa， respectively， with the liquid/solid volume ratio of 9.93， indicating desirable comprehensive mechanical properties.  
        关键词：A356/Q345 Composites;Liquid/solid Volume Ratio;Compound Casting;Interfacial Microstructure;Mechanical Properties   
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        发布时间：2024-10-23
      • “固-液复合法制备Fe/ZCuPb20Sn5双金属，研究了P对铜层摩擦性能的影响。P含量为0.3%时，摩擦因数与磨损率最小，磨损机制由黏着磨损与剥层磨损向磨粒磨损转变。”
        KANG Yuanyuan
        Vol. 44, Issue 10, Pages: 1320-1325(2024) DOI: 10.15980/j.tzzz.2024.10.005
        摘要：Fe/ZCuPb20Sn5 bimetal was fabricated by solid-liquid compound method， and effects of P content on dendrite refinement， element segregation and precipitation behavior of the second phase in bimetallic copper layer as well as the tribological properties of copper layer were systematically investigated. The results indicate that P is distributed in the interval of α-Cu and α-（Cu，Sn）， which reduces the segregation of Sn elements， leading to the precipitation of Cu3P strengthening phase and refinement of matrix. The friction coefficient and wear rate of copper layer are decreased gradually with increase of P content， reaching the minimum value at 0.3%. In the worn furrows， Pb surrounds Cu3P phase to generate self-lubricating layer， enhancing tribological properties of material. The wear mechanism is transformed from adhesive wear and peeling wear to abrasive wear with increase of P content.  
        关键词：Steel/Copper Bimetal;Friction Wear;ZCuPb20Sn5;Microstructure Evolution   
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        发布时间：2024-10-23
      • “在材料科学领域，研究人员采用超声辅助熔盐反应法制备Al-10TiB2中间合金，并通过超声辅助重熔稀释法制备出组织均匀且具有较高强度的5%TiB2/A356复合材料，为提高材料性能提供新途径。”
        LI Yalong,LIU Zhiwei,DONG Zhiwu,YU Shenwei,HE Yuan,DONG Qijuan,WEI Zuoshan,LI Zhenglin,SHANG Jinchi
        Vol. 44, Issue 10, Pages: 1326-1332(2024) DOI: 10.15980/j.tzzz.2024.10.006
        摘要：Al-10TiB2 intermediate alloy was prepared by ultrasonic assisted molten salt reaction method， and 5%TiB2/A356 composite with homogeneous microstructure and high strength was fabricated via ultrasound assisted remelting and dilution approach. The microstructure and mechanical properties of the composites were investigated. The results indicate that the microstructure is homogeneous without residual impurity salt. The size of α-Al grains is decreased from 250 μm to 190 μm， which is reduced by 24%， after adding 5% TiB2 particles. Moreover， the yield strength and tensile strength of as-cast composites are 124 MPa and 175 MPa， which is enhanced by 12.7% and 6.1%， respectively， in comparison with those of A356 alloy. The yield strength and tensile strength of heat-treated composites are 250 MPa and 290 MPa， which is enhanced by 19.0% and 13.7%， respectively， in comparison with those of A356 alloy.  
        关键词：TiB2/A356 Composites;Ultrasound;Remelting and Diluting;Microstructure;Mechanical Properties   
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        发布时间：2024-10-23
      • “在材料科学领域，专家研究了固溶工艺对复合板材性能的影响，发现最佳热处理工艺，显著提升了剪切强度、抗拉强度、屈服强度和伸长率。”
        ZHANG Dingding,JIA Pinfeng,XU Zhen,CHEN Qingqiang
        Vol. 44, Issue 10, Pages: 1333-1338(2024) DOI: 10.15980/j.tzzz.2024.10.007
        摘要：Effects of different solution processes on microstructure and properties of 1070A/2024 cast and rolled composite plates were investigated. The microstructure of plates was observed and analyzed by metallographic and scanning electron microscopy and energy spectrum analysis， and the performance tests were carried out by tensile and shearing test. The results indicate that the structure is dominated by Al2Cu after solution treatment， and the optimal heat treatment process is annealing at 360 ℃ for 2 h + solid solution at 495 ℃ for 1 h， where the shear strength， tensile strength， yield strength and elongation of the composite plate are 147.83 MPa， 321.41 MPa， 373.92 MPa and 28.34%， respectively.  
        关键词：1070A/2024 Composite Plate;Solution Treatment;Mechanical Properties;Interfacial Microstructure   
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        发布时间：2024-10-23
      • “在材料科学领域，研究人员采用6061液态金属合金化处理，制备了固-液铸轧6061/AZ31B复合板。研究发现，添加0.2%的Sc元素，可显著细化铝基体晶粒，提高复合板的力学性能。”
        ZHANG Ning,LI Yuandong,QIU Jin,LIANG Xiaoyu,ZHOU Hongwei,WANG Sheng,CAO Chi
        Vol. 44, Issue 10, Pages: 1339-1344(2024) DOI: 10.15980/j.tzzz.2024.10.008
        摘要：Taking AZ31B as substrates and 6061 liquid metals with different Sc contents （0， 0.1%， 0.2%， 0.3%， 0.4%） as casting materials， 6061/AZ31B composite plate was solid-liquid rolled. The microstructure and phase compositions of alloys were analyzed by OM、SEM and XRD， and mechanical properties were tested. The results indicate that the thicknesses of bonding interface of composite plates with different Sc contents have little change， which are all about 5 μm， while grains are significant refined. The refinement effect is optimal with Sc content of 0.2%， and composite plates exhibit desirable mechanical properties， where the tensile strength and shear strength reach peak values of 234.841 MPa and 70.032 MPa， respectively， which is 22.0% and 69.3% higher than those of ones without Sc addition.  
        关键词：6061/AZ31B Composite Plate;Microstructure;Mechanical Properties;Sc Contents   
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        发布时间：2024-10-23

        Research·Computer Application

      • “在镁合金逆向设计领域，研究者提出基于循环生成对抗网络的框架，显著提升预测精度，为设计提供参考范围。”
        MA Honghao,DONG Wanpeng,SU Dejun,CAO Xuekun
        Vol. 44, Issue 10, Pages: 1345-1351(2024) DOI: 10.15980/j.tzzz.2024.10.009
        摘要：In order to find suitable materials for specific application scenarios or feature requirements， a reverse design framework based on the Cycle Generative Adversarial Network （Cycle-GAN） was proposed，which integrates Long Short-Term Memory （LSTM） artificial neural networks and Variational Autoencoders （VAE） and applied to the reverse design of magnesium alloys， covering aspects from mechanical performance to composition and extrusion parameters. Compared to traditional artificial neural networks and support vector machine algorithms， the framework model demonstrates an improvement of 27% and 47% in prediction accuracy， respectively. The mean squared error and mean absolute error on the test dataset are 0.09 and 0.15. Additionally， the framework provides a reference range， narrowing down the everse design space for of magnesium alloys.  
        关键词：Magnesium Alloys;Reverse Design;Cycle-generative Adversarial Networks;Mechanical Properties   
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        发布时间：2024-10-23
      • “AlP作为异质形核衬底促进初生Si细化，研究了AlP/Si界面结构的黏附能、界面能、界面接触角及电子和键合作用。”
        ZHANG Mengjun,YOU Zhiyong,LI Mufei,ZHANG Yunguan,JIANG Aoxue,NIU Xiaofeng
        Vol. 44, Issue 10, Pages: 1352-1356(2024) DOI: 10.15980/j.tzzz.2024.10.010
        摘要：AlP can be used as the heterogeneous nucleation substrate of primary silicon in hypereutectic Al-Si alloy to promote the nucleation of primary Si and achieve the refinement of primary Si. However， there is still a lack of research on the mechanism of heterogeneous nucleation at atomic scale. The adhesion energy， interface energy， interface contact angle as well as electron and bond interaction of various AlP/Si interface structures were calculated and investigated based on the first principles of density functional theory. The results indicate that the interface adhesion energy of AlP/Si in AlP （100） structure reaches the maximum of 4.23 J/m2， and the shortest interface equilibrium distance is 0.211 μm as well as the lowest interface energy of 0.29 J /m2. The minimum interface contact angle is 19.9°. The causes for the stability and combination mechanism of various interfaces were analyzed in detail through electron and bond cooperation， and the calculated results are consistent with the analyzed ones.  
        关键词：Hypereutectic Al-Si Alloy;Heterogeneous Nucleation;Adhesion Energy;Interface Energy;First Principles   
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        发布时间：2024-10-23

        Research·Additive Manufacture

      • “在3D打印领域，研究者采用高速离心雾化工艺制备纯银粉，系统研究了粉末飞行距离和粒径分布、显微组织、元素分布之间的关系，并采用选区激光熔化工艺制备纯银块体试样。”
        XIONG Xiaojing,YANG Jixin
        Vol. 44, Issue 10, Pages: 1357-1361(2024) DOI: 10.15980/j.tzzz.2024.10.011
        摘要：Pure Ag powders for 3D printing were prepared by high-speed centrifugal atomization process， and blocky Ag specimens were fabricated by selective laser melting. The relationship between flight distance with particle size distribution， microstructure and element distribution was systematically investigated. The results indicate that the particle size of Ag powders prepared at 60 000 r/min fluctuates within the range of 3.8 μm to 101.2 μm. D50 powders are increased with the flight distance increase， and element contamination is hardly observed. The overall sphericity of powder is desirable without satellite powder or hollow powder， and the microstructure presents cell crystal. The blocky Ag specimen is composed of equiaxed grains with an average size of 0.14 μm.  
        关键词：Centrifugal Atomization;Pure Ag Powders;3D Printing   
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        发布时间：2024-10-23

        Research·Alloy Performance

      • “激光熔覆功率提升TC4钛合金硬度，耐磨性能显著增强。”
        ZHANG Bo,DANG Guodong,GAO Peihu,CHEN Baiyang,LI Jianping,FU Ruitao,LI Qibao,FAN Hu
        Vol. 44, Issue 10, Pages: 1362-1367(2024) DOI: 10.15980/j.tzzz.2024.10.012
        摘要：Using X-ray diffractometer （XRD）， energy dispersive spectrometer （EDS）， scanning electron microscope （SEM）， microhardness tester， friction and wear tester， effects of laser cladding power on microstructure and mechanical properties of cladded layer were investigated. The results indicate that the cladded tin bronze layer is mainly composed of Cu10Sn3， Cu6Sn5， Cu4Ti3， CuTi and Cu2O phases， which is well bonded to the substrate without pores and cracks. With the laser cladding power rising from 480 W to 640 W， the hardness of coating is increased gradually， reaching the maximum of 482 HV0.2 at 640 W， which is about 5.24 times of that of tin bronze， and 1.60 times of that of TC4 substrate. Meanwhile， the lowest friction coefficient of 0.51 and the minimum wear weight loss of 1.2 mg are obtained， which are lower than that of tin bronze and TC4 substrate. The wear resistance is 3.4 times higher than that of tin bronze， and 5.6 times higher than that of TC4 substrate. The wear mechanism of the coating is dominated by abrasive wear and oxidation wear.  
        关键词：Laser Cladding;Tin Bronze;TC4 Titanium Alloy;Microhardness;Wear Resistance   
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        发布时间：2024-10-23
      • “弹性加载处理引入非晶合金梯度结构，提升室温塑性。”
        ZHOU Jingyu,SHI Bo
        Vol. 44, Issue 10, Pages: 1368-1374(2024) DOI: 10.15980/j.tzzz.2024.10.013
        摘要：Gradient structure was induced into the relaxed Ti32.85Zr30.21Cu9Ni5.28Be22.66 amorphous alloy through elastic loading treatment， and effects of gradient structure on mechanical properties of alloy were investigated. The results reveal that gradient structures can hinder the rapid expansion of shear bands and dissipate more energy， which delays fracture. The compressive plasticity of amorphous alloy is increased from 3.2% to 8.8%， indicating that the existence of gradient structures endows relaxed amorphous alloy with additional plasticity.  
        关键词：Gradient Amorphous Alloy;Elastic Loading;Thermodynamic Stability;Plasticity   
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        发布时间：2024-10-23
      • “在铝合金领域，研究了Sc和Zr含量对ZL205A合金性能的影响，发现添加0.40%Sc和0.15%Zr时，合金抗拉强度和伸长率显著提升。”
        QI Yushi,REN Yan,DU Lanjun,JIN Yu,DU Zhiming,LIU Yongwang,CHEN Gang
        Vol. 44, Issue 10, Pages: 1375-1381(2024) DOI: 10.15980/j.tzzz.2024.10.014
        摘要：The effects of Sc and Zr contents on microstructure and mechanical properties of squeezing casting ZL205A alloy were investigated. The results indicate that with the mass fraction of Sc element increasing， the grain structure of alloy is refined and the tensile strength is increased firstly and then decreased. When the mass fraction of Sc element is 0.40%， the tensile strength， elongation and hardness of alloy reach 389.5 MPa， 14.8% and 122.9 HV， respectively. Simultaneous addition of Sc and Zr elements has significant improvement on microstructures and mechanical properties of alloy. With 0.40% Sc and 0.15% Zr addition， the tensile strength and elongation of alloy at room temperature reach 398.3 MPa and 15.7%， respectively. After T5 heat treatment， the tensile strength and elongation of alloy at 150 ℃ reach 345.1 MPa and 15.8%. The connecting rod component with satisfied surface quality was successfully fabricated by squeezing casting with modified ZL205A alloy. The tensile strength， elongation and hardness of connecting rod reach 468.6 MPa， 15.2% and 146.6 HV， respectively.  
        关键词：Sc;Zr;ZL205A Alloy;Microstructure;Mechanical Properties   
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        发布时间：2024-10-23
      • “在高温力学性能研究领域，专家采用晶体塑性有限元方法，对DD6镍基单晶合金进行了深入研究。结果表明，在一定加载速率下，不同取向单晶合金的屈服应力和弹性模量存在显著差异。”
        ZHAO Hongwei,YANG Xianliang,ZHANG Song,YOU Mengchun,LIU Erqiang
        Vol. 44, Issue 10, Pages: 1382-1387(2024) DOI: 10.15980/j.tzzz.2024.10.015
        摘要：The crystal plasticity finite element method （CPFEM） was employed to investigate mechanical properties of DD6 single crystal alloy under high temperature conditions. The results indicate that under certain loading rates， the （223）［11-0］orientation exhibits the highest yield stress and elastic modulus among different orientations. The activation levels of different slip systems also vary for different orientations， resulting in different values of maximum accumulated shear strain. Grains with all orientations suffer grain rotation， where the （001）［11-0］orientation exhibits the largest deviation angle. Under the constant orientation condition， strain rate has little influence on the elastic modulus， while the yield stress shows a positive correlation with strain rate.  
        关键词：Nickel-based Single Crystal Alloy;Crystal Plasticity;Yield Stress;Texture Evolution   
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        发布时间：2024-10-23
      • “在铝合金领域，专家研究了稀土元素对A356铝合金微观组织和力学性能的影响，发现0.35%稀土添加量时性能最优。”
        XING Boyan,CHEN Yisheng,YAN Yongwang,LIU Yichang
        Vol. 44, Issue 10, Pages: 1388-1391(2024) DOI: 10.15980/j.tzzz.2024.10.016
        摘要：The effects of mixed additions of La and Ce in the range of 0~0.35% on the microstructure and mechanical properties of A356 aluminum alloy were investigated by metallographic microscope， tungsten filament scanning electron microscope and field emission scanning electron microscope. The results reveal that optimal microstructure and mechanical properties of A356 aluminum alloy are obtained with mixed rare earth addition of 0.35%， and the equivalent diameter and SDAS value of α-Al grains reach the minimum value of 24.24 µm and 38.07 µm， respectively， with the satisfied eutectic silicon refinement. The tensile strength and yield strength reach the maximum values of 178.5 MPa and 145.6 MPa，and the fracture type is gradually changed from brittle fracture to ductile fracture.  
        关键词：A356 Aluminum Alloy;Mixed Rare Earth;Microstructure;Mechanical Properties   
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        发布时间：2024-10-23
      • “在材料科学领域，研究者通过实验分析了Nb含量对GCr15钢性能的影响，发现0.04%Nb时抗拉强度最高，0.08%Nb时硬度最大。”
        LIAO Jincheng,GUO Jintao,YANG Yitao
        Vol. 44, Issue 10, Pages: 1392-1397(2024) DOI: 10.15980/j.tzzz.2024.10.017
        摘要：The effects of different Nb contents on structure and properties of modified GCr15 were investiagted by OM， SEM， tensile and hardness tests. The results indicate that microstructure of the GCr15 experimental steel after quenching and tempering is composed of tempered martensite， a small amount of retained austenite and carbide. After the addition of Nb element， the austenite grain is refined with convention of the type of carbides， and NbC precipitated phase appears. When the content of Nb is 0.04%， the tensile strength of steel is the highest， reaching 1 249.81 MPa. When the Nb content is 0.08%， the hardness of the steel reach maxinum value， which is 61.2 HRC.  
        关键词：Nb Microalloying;Modified GCr15;NbC;Microstructure;Mechanical Properties   
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        发布时间：2024-10-23
      • “在材料科学领域，研究人员通过实验发现，Mn元素的添加能显著改善TiAl合金的微观结构和力学性能，其中Ti51.5Al45Nb2Mn2.5合金展现出最佳性能。”
        KUANG Qiao,WU Xinlin,ZHANG Hailong,WANG Qiang
        Vol. 44, Issue 10, Pages: 1398-1401(2024) DOI: 10.15980/j.tzzz.2024.10.018
        摘要：Effects of Mn content on microstructure and mechanical properties of TiAl alloy were investigated by OM， X-ray， tensile test and SEM. The results reveal that Ti53-xAl45Nb2Mnx（x=0、 1、 2.5、 4，molar fraction，%） alloys are composed of γ-TiAl and α2-Ti3Al phases. Mn is dissolved in the alloy matrix in form of solid solution atom， inducing lattice distortion， thus leading to a larger interplanar spacing. With the increase of Mn contents， the lamellar structure is significantly refined， and the lamellar thickness is decreased from （670±120） nm to （610±90） nm， （580±100） nm and （540±90） nm， respectively. The compressive yield strength， compressive strength and fracture strain of alloys at room temperature are firstly increased and then decreased with the increase of Mn contents， which are 930 MPa， 1 605 MPa， and 30.4%， increased by 32.9%， 35.4% and 83.1% compared with those of Mn-free TiAl alloy， respectively， indicating desirable properties.  
        关键词：TiAl Alloy;Mn Alloying;Microstructure;Mechanical Properties   
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        发布时间：2024-10-23
      • “在合金材料领域，研究人员采用真空电弧熔炼工艺制备了Ni-20Cr及改性的Ni-20Cr-xAl-1Si合金，通过多种检测手段研究了Al含量对合金电阻率、显微组织和力学性能的影响。研究发现，随着Al含量增加，合金电阻率先上升后下降，强度、硬度逐渐上升，塑性、韧性逐渐下降。Ni-20Cr-5Al-1Si合金的电阻率达1.523 μΩ·m，较Ni-20Cr合金提升了43.81%，屈服强度、抗拉强度、硬度（HV0.2）分别上升至664.9 MPa和864.6 MPa和340.8，伸长率下降至31.83%。”
        ZHANG Xiufa,XIA Tiandong,WANG Xiaojun,LEI Zhigang
        Vol. 44, Issue 10, Pages: 1402-1408(2024) DOI: 10.15980/j.tzzz.2024.10.019
        摘要：Ni-20Cr and modified Ni-20Cr-xAl-1Si （x=3，4，5，6，7，mass fraction，%） alloys were prepared by vacuum arc melting， and effects of Al content on resistivity， phase， microstructure and mechanical properties of NiCrAlSi alloy were investigated by XRD， SEM， EPMA， tensile and hardness tests. The results indicate that Ni-20Cr is composed of γ single phase， and Ni-20Cr-xAl-1Si is composed of γ matrix phase and γ '-Ni3Al precipitation phase. With the increase of Al content， the content of γ '-Ni3Al phase is firstly increased and then decreased， which plays an important role in precipitation strengthening and resistivity enhancement， and the solid solution strengthening of Al in γ/γ' phase is gradually increased， leading to the first increase and then reduction of resistivity， gradually increase in the strength and hardness， and gradually decrease in the plasticity and toughness. The resistivity of Ni-20Cr-5Al-1Si alloy reaches 1.523 μΩ·m， which is increased by 43.81% compared with Ni-20Cr. The yield strength， tensile strength and hardness of the alloy are increased to 664.9 MPa， 864.6 MPa and 340.8 HV0.2， respectively， while the elongation is decreased to 31.83%.  
        关键词：Al;γ′-Ni3Al;Resistivity;Microstructure;Mechanical Properties   
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        发布时间：2024-10-23
      • “在铝合金领域，Sc、Er、Be复合添加显著改善了Al-Zn-Mg-Cu合金的组织与性能，硬度达到240.6HV。”
        ZHANG Botao,HE Yongdong,ZHAO Yikun,BAI Wanquan,CHEN Changke,LIU Xiaolong,CHEN Shoujun,DU Yufeng
        Vol. 44, Issue 10, Pages: 1409-1415(2024) DOI: 10.15980/j.tzzz.2024.10.020
        摘要：The effects of compound addition of Sc， Er， and Be on the microstructure and properties of Al-8.3Zn-2.2Mg-2.3Cu alloys were investigated using optical microscope （OM），electron backscatter diffraction （EBSD）， scanning electron microscope （SEM）， transmission electron microscope （TEM）， and Vickers hardness test methods. The results indicate that the addition of Sc， Er， and Be elements can increase the proportion of low angle grain boundaries to 56.2%， effectively reducing the transition from low angle grain boundaries to high angle grain boundaries in the alloy， and the alloy presents little preferred orientation. After T6 treatment， large amounts of spherical Al3Sc dispersoids are observed within the alloy and at grain boundaries， accelerating the precipitation of η′ while hindering grain boundary and dislocation movements. The addition of Be plays a role in solid solution strengthening. Additionally， partial Be exists in the form of α-Be， while another portion forms a Be-containing second phase at the grain boundaries. The hardness of the alloy in T6 state is 240.6 HV.  
        关键词：Al-Zn-Mg-Cu Alloys;Composite Addition;Microstructure;Pinning Effect   
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        发布时间：2024-10-23

        Research·Alloy Process

      • “在镁合金半固态组织演变研究中，通过等温热处理法制备了Mg-7Zn-0.3La-xCu镁合金半固态浆料，揭示了Cu含量、等温温度和等温时间对合金组织演变的影响。”
        HUANG Xiaofeng,CHEN Xuanyu,HE Guangliang,ZHANG Xintao,TAO Wei,HE Dandan
        Vol. 44, Issue 10, Pages: 1416-1422(2024) DOI: 10.15980/j.tzzz.2024.10.021
        摘要：A Mg-7Zn-0.3La-xCu （x=0， 0.5， 1.0， 1.5， %） magnesium alloy semisolid slurry was prepared using isothermal heat treatment method. The influence of Cu content， isothermal temperature， and isothermal time on the evolution of semi-solid microstructure of Mg-7Zn-0.3La magnesium alloy was observed using optical microscopy， scanning electron microscopy， and EDS analysis. The experimental results reveal that the as-cast microstructure of Mg-7Zn-0.3La-1Cu magnesium alloy mainly consists of a white α-Mg matrix and a black eutectic structure （α-Mg + MgZn2 + Mg4Zn7 + CuMgZn）. During the initial stages of isothermal heat treatment， Cu plays a role in accelerating the separation and spheroidization of non-dendritic grains. With increasing in isothermal temperature or extension of isothermal time， the non-dendritic grain size and shape factor exhibit a trend of first decrease and then increase. Specifically， with the isothermal heat treatment parameters set at 580 ℃ for 30 min， the non-dendritic microstructure of Mg-7Zn-0.3La-1Cu magnesium alloy reaches desirable， where the average non-dendritic grain size， shape factor， and solid fraction reach up to 43.51 μm， 1.32， and 64.38%， respectively. The evolution of semisolid microstructure mainly undergoes four stages： initial coarsening， structure separation， spheroidization， and final coarsening.  
        关键词：Cu Content;Magnesium Alloy;Semi-solid;Microstructure Evolution   
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        发布时间：2024-10-23
      • “在材料科学领域，研究者通过精确调控轧制变形量，揭示了Al-Sn合金中第二相形貌演变规律，发现短纤维状第二相可提升合金自润滑性能，从而增强耐磨性能。”
        LI Shiming,DONG Zhuangzhuang
        Vol. 44, Issue 10, Pages: 1423-1427(2024) DOI: 10.15980/j.tzzz.2024.10.022
        摘要：The influence of rolling deformation on the morphology evolution of secondary phases and friction properties of Al-Sn alloy was investigated. Al-Sn alloy ingots were prepared by induction melting process. Then， the alloy was subjected to rolling treatment. The rolling deformation was precisely controlled to reveal the morphology evolution of Sn-rich secondary phases. The results iudicate that as the rolling deformation increases， the Sn-rich secondary phase is gradually transformed from a continuous network structure to a discontinuous short fiber structure， and the friction coefficient remains around 0.27. However， the sliding-slip phenomenon during the friction process is significantly weakened. Meanwhile， the Vickers hardness of alloy is increased from 17.9 HV in as-cast state to 28.8 HV at 75% deformation， and the wear rate is decreased from 7.49×10-4 mm3/（N∙m） to 5.51×10-4 mm3/（N∙m）.Therefore the short fiber like second phase enhances the self-lubricating performance of alloys， and the synchronous improvement of hardness and self-lubricating performance leads to the improvement of wear resistance of Al-Sn alloys.  
        关键词：Al-Sn Alloy;Secondray Phase;Self-lubricating Property;Wear Resistance   
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        发布时间：2024-10-23

        Application·Production Technology

      • “在铝合金柱塞油泵铸件生产领域，专家优化改进铸造工艺，采用AnyCasting软件模拟分析，成功解决缩松、气孔等缺陷，满足品质要求。”
        FENG Chao,TANG Zhen,JI Xuhui
        Vol. 44, Issue 10, Pages: 1428-1430(2024) DOI: 10.15980/j.tzzz.2024.10.023
        摘要：In view of casting defects of aluminum alloy plunger pump castings that often occur during production process， such as shrinkage porosities and holes， the origination of defects was analyzed according to the structural characteristics of castings. The casting process was optimized and numerically simulated by AnyCasting software. The results indicate that the casting defects can be totally solved by the optimized scheme for piston pump shell， and produced castings can meet quality requirement.  
        关键词：Plunger Pump;Aluminum Alloy Castings;Casting Defects;Numerical Simulation   
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        发布时间：2024-10-23
      • “在热顶铸造铝合金空心铸锭领域，专家分析了漏铝问题产生的原因，并提出了有效解决方案。”
        DU Xinyu
        Vol. 44, Issue 10, Pages: 1431-1435(2024) DOI: 10.15980/j.tzzz.2024.10.024
        摘要：With hot top casting aluminum alloy hollow ingot， due to the thin crystalline shell on the inner hole surface， crack is easily occurred on the shell under the action of force and even leak the molten alloy. Through microscopic observation， it is found that there are stretch marks and cracks in the ingot where the molten liquid is leaken， and sudden leakage often occurs. Combined with the actual production， the causes of tensile leakage and non-tensile leakage in hollow aluminum alloy ingot were analyzed. It is pointed out that some measures should be taken from the structure of casting mould， casting parameters and operation technology to avoid molten alloy liquid leakage. The thickness and tension of the inner cavity shell are controlled by achieving a thermal balance between the heat release of aluminum alloy melt and heat absorption of cooling water during semi-continuous casting. The non-tensile leakage is mainly caused by excessive pressure in the cavity of cast pipe. Therefore， a casting mold equipped with an internal hole exhaust device was developed， and measures were taken to optimize the casting temperature， casting speed， cooling speed and cooling uniformity. The production reveals that the gas pressure in the mold cast pipe is effectively reduced by using the internal hole exhaust device， and the non-tensile leakage is eliminated，while other measures can well control the thickness of crystalline shell to avoid tensile leakage.  
        关键词：Aluminum Alloy Hollow Ingot;Hot Top Casting;Crack;Stress   
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        发布时间：2024-10-23

        Application·Die Casting

      • “在铸造领域，研究了浇注温度和保压压力对ADC12铝合金铸件性能的影响，确定了最优工艺参数，为提高铸件力学性能提供解决方案。”
        ZHANG Mingyu,NIU Xiaofeng,JIA Xianglei,CUI Yuwei
        Vol. 44, Issue 10, Pages: 1436-1440(2024) DOI: 10.15980/j.tzzz.2024.10.025
        摘要：In order to investigate the effects of casting temperature and holding pressure on shrinkage and porosity and mechanical properties of ADC12 aluminum alloy castings, ProCAST software was used to simulate the filling and solidification process of squeezing casting. A fixed support part of an automobile engine was produced by indirect squeezing casting to obtain desirable mechanical properties. Through simulation analysis, mechanical properties testing and metallography observation, the satisfied process parameters were determined as follows: Casting temperature of 680 ℃, holding pressure of 150 MPa and mold temperature of 250 ℃. Moreover, the holding pressure plays a dominant role in eliminating shrinkage and porosity defects of castings, improving microstructure and enhancing the mechanical properties of castings.  
        关键词：Engine Bracket;Aluminium Alloy;Squeezing Casting;Numerical Simulation   
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        发布时间：2024-10-23
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