最新刊期
卷 44 ， 期 2 ， 2024
- “在热学、力学、电学等领域，氮化铝（AlN）陶瓷材料的研究进展备受关注。专家综述了AlN增强Al基、Mg基复合材料的制备方法、显微组织及性能，为复合材料应用提供新方向。”摘要：As a ceramic material with excellent properties， aluminum nitride （AlN） is of great application value in the fields of thermology， mechanics， electronics， etc.The metal matrix composites formed by adding AlN ceramics to Al， Mg and other metals can obtain desirable comprehensive properties. The structure and properties of AlN were briefly introduced， and the research status of preparation methods， microstructure， mechanical and thermophysical properties of AlN reinforced Al and Mg matrix composites was reviewed. The existing problems of the composites were explored， and future application directions were prospected.关键词：AlN;Composites;Preparation Method;Microstructure;Performance
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发布时间：2024-05-28
Current Recommendation
- “在铝合金斜头管挤压铸造成形工艺研究中，通过优化工艺参数，成功生产出外形完好、内部无缺陷的铸件。经T6热处理后，铸件的力学性能达到设计要求，为车身轻量化提供了有效解决方案。”摘要：In order to achieve lightweight construction and simultaneously ensure desirable formability and excellent mechanical performance of the inclined tube， the squeeze casting process of aluminum alloy inclined tube was explored. The results indicate that with the casting temperature of 710 ℃，three-stage injection speeds of 200、90、150 mm/s， mold temperature of 250 ℃， local extrusion delay time of 2.5 s， and local extrusion holding time of 25 s， the produced inclined tube exhibits perfect external shape without obvious internally defects. After T6 heat treatment （solution treatment for 535 ℃×8 h， aging treatment for 180 ℃×4 h）， the tensile strength， yield strength and elongation of the inclined tube reach 318.4 MPa， 269.5 MPa， and 12.95%， respectively， meeting requirements of product design.关键词：Inclined Tube;Squeeze Casting;Local Extrusion;T6 Heat Treatments
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发布时间：2024-05-28
Experimental Invsetigation
- “在金属材料领域，研究者们通过施加物理外场调控液态金属凝固过程，以改善凝固组织，获得高性能铸件。这一发现为金属材料的创新应用和发展趋势提供了新方向。”摘要：Physical external field can control the solidification process of liquid metal to obtain high-quality castings by improving the solidification structure. The development status and mechanism of different physical external fields， including electric pulse， electromagnetic field， gravity field and ultrasonic wave， on solidification structure of pure metal and alloy were described. The influence of physical external field on solidification process of alloy as well as application in metals was summarized， and the innovative application and development trend of each external field were introduced.关键词：Electrical Pulse;Electromagnetic Field;Gravity Field;Ultrasound;Solidification Structure
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发布时间：2024-05-28
Research·Review
- “在材料热物性参数求解领域，专家提出了一种基于冷却曲线差异的粒子群优化寻优方法，以25G材料为例进行了验证，结果表明该方法精度高、计算次数少、人工经验依赖度低。”摘要：In view of problems of few methods suitable for solving thermal physical parameters and high dependence on artificial experience during the casting process， a fitness function based on the difference between cooling curves was built up according to the characteristics of casting cooling curves and particle swarm optimization algorithm， and an inertial weight adjustment strategy based on the population search state and particle fitness ranking was proposed. Combined with the particle swarm velocity iteration strategy of the characteristic fitness of the cooling curve， a method for optimizing thermal physical parameters of materials during the casting process was established， which was verified by 25G steel. The reusults indicate that the proposed method can achieve the same accuracy as the artificial inverse method， which requires less calculation times and less dependence on artificial experience.关键词：Cooling Curve Characteristics;Particle Swarm Algorithm;Thermal Property Parameter
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发布时间：2024-05-28 - “在精密铸造领域，研究者利用ProCAST软件模拟了DZ409合金大尺寸空心定向叶片的铸造过程，分析了温度场、凝固参数和应力场，并通过G/R值优化工艺，显著改善了叶身晶粒取向。”摘要：The temperature field of large-size hollow directional blade of DZ409 alloy during investment casting process was investigated by the ProCAST software， and the variation of the front edge of solid-liquid interface was analyzed. Effects of pouring temperature， shell temperature and drawing rate on temperature field， solidification parameters and stress field during directional solidification were explored， and the solidification structure was simulated by G/R analysis. The results indicate that with the pouring temperature of 1 560 ℃ and mold temperature of 1 560 ℃， the temperature gradient and G/R value of the casting are larger at different positions， which is conducive to the growth of directional solidification columnar crystal. Low drawing rate can lead to large temperature gradient and G/R value， which is conducive to the growth of directional columnar grain. The grain orientation of the leaf can be significantly improved by selecting suitable pouring temperature and drawing rate. The optimum process obtained by simulation was verified， and the grain orientation results are in consistent with the simulated ones.关键词：Directional Blade;ProCAST;Investment Casting
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发布时间：2024-05-28
Research·Computer Application
- “最新研究揭示了温度对AZ31镁合金中厚板弯曲行为的影响，发现随着温度升高，弯曲断裂应力显著下降，主要由于非基面滑移和孪生被激活导致变形抗力降低。研究还发现，在100℃弯曲过程中，镁板拉伸区孪晶数量远少于压缩区，拉伸区再结晶晶粒占比为2.10%，变形晶粒占比高，晶界为小角度晶界，位错密度大，晶粒c轴取向向ND方向转动，导致拉伸区变形程度大、协调性差，更易发生断裂。这一发现为镁合金板材的加工和应用提供了重要指导。”摘要：The bending behavior of medium and thick plates after magnesium alloy rolling was analyzed. The influence of temperature on the bending of magnesium alloy plate and the microstructure evolution of magnesium alloy plate during bending were explored. The results reveal that bending fracture stress is decreased greatly with increasing in temperature， which is attributed to the increase of temperature leading to the activiation of non-primary sliding and twins to decrease the deformation resistance. Bending simulation shows that the inner side is subjected to pressing stress while outer side is subjected to tensile stress， and fracture strain is higher than bending fracture strain during rolling process. Twins in tensile zone is far less than that in compressive zone of the magnesium plate during bending at 100 ℃， and recrystallization grain is 2.10% in tensile zone with high fractions of deformed grain and major of lower angle boundary as well as high dislocation density. Density point of （0001）pole is concentrated in ND direction， and c axis is rotated to ND direction， resulting in the poor coordination and large deformation of tensile zone， tending to crack.关键词：Magnesium Alloy;Medium and Thick Plate;Bending Behavior;Temperature Influence
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发布时间：2024-05-28 - “在国际热核聚变实验堆偏滤器服役工况下，Cu-0.6Cr-0.1Zr合金的力学性能和电导率研究取得新进展。通过优化轧制时效工艺，实现了合金屈服强度624.5 MPa、伸长率12.1%、电导率45.762 MS/m的优异综合性能。TEM和EBSD分析揭示了晶界强化、位错强化和析出强化是合金强度高的关键因素。”摘要：Cu-0.6Cr-0.1Zr alloy was fabricated based on the service conditions of ITER divertor， and effects of different rolling and aging processes on mechanical properties and electrical conductivity of the alloy were investigated. The results indicate that the optimal performance of the alloy is achieved under the condition of solution treatment of 950 ℃for 2 h+50% cold rolling at room temperature + aging at 450 ℃ for 15 min + 80% cold rolling at room temperature + aging at 450 ℃ for 2 h， where the yield strength， elongation and electrical conductivity reach 624.5 MPa， 12.1% and 45.762 MS/m. The main strengthening phases and microstructure of the alloy were characterized by TEM and EBSD. The results reveal that grain boundary strengthening， dislocation strengthening， and precipitation strengthening make a great contribution to the high strength of Cu-0.6Cr-0.1Zr alloy.关键词：Cu-Cr-Zr Alloy;Rolling;Aging;Precipitate;Dislocation Density
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发布时间：2024-05-28 - “在铝合金挤压铸造成形领域，研究人员通过数值模拟和金相组织分析，发现半固态挤压铸造具有充形平稳、凝固时间短、孔隙率低等优点。通过固溶、时效热处理，可以显著改善A356铝合金的组织及性能。经540℃×4h固溶+180℃×9h时效处理后，半固态挤压铸造试样展现出优异的抗拉强度、伸长率和热导率，为铝合金挤压铸造成形提供了新的解决方案。”摘要：The numerical simulation and microstructure analysis were applied to understand the forming sequence and solidification process of squeeze casting A356 aluminum alloy. The results indicate that semi-solid squeeze casting exhibits stable filling， short solidification time with low porosity. The microstructure and properties of the alloy by metal mold casting， liquid squeeze casting and semi-solid squeeze casting can be improved after solution and aging heat treatment. The results reveal that the grain morphology of α-Al matrix is the same as that of as-cast ones and the size is slightly larger， and the eutectic silicon is spheroidized and the size is around 1.5 μm after solution treatment. The mechanical properties and thermal conductivity of the alloy are increased at first and then decreased with the increase of solution temperature， while the mechanical properties of semi-solid squeeze casting keeps stable in the solution temperature range of 560 ℃. After further aging treatment， dispersed Mg2Si strengthening phase can be precipitated from the supersaturated solid solution， which can not only improve the tensile strength of A356 aluminum alloy by hindering dislocation movement， but also improve the thermal conductivity by reducing the scattering effect of solid solution atoms and vacancies on electrons. The semi-solid squeeze casting specimen exhibits the satisfied performance after solution treatment at 540 ℃ for 4 h and aged treatment at 180 ℃ for 9 h， where the tensile strength， elongation and thermal conductivity reach 283.65 MPa， 13.2% and 191.82 W/（m∙K）， respectively.关键词：Squeeze Casting;Semi-solid;Numerical Simulation;Heat Treatment;Thermal Conductivity
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发布时间：2024-05-28 - “在镁合金领域，研究者通过重力铸造、挤压铸造及流变挤压铸造工艺制备Mg-12Zn-1Y合金，发现流变挤压铸造在超声功率1600W时，合金的力学性能最优，显著提高了屈服强度、抗拉强度和伸长率。”摘要：The icosahedral quasicrystal I-phase （Mg3Zn6Y） can be formed in the Mg-Zn-Y alloys with specific Zn and Y content， of which the microstructure in the conventional casting is usually coarse and difficult to exert performance advantages. The microstructure and mechanical properties of Mg-12Zn-1Y alloy prepared by gravity casting， squeeze casting and rheo-squeeze casting （RSC） were investiagted. The results reveal that in the gravity casting specimen， a large number of I-phase and Mg7Zn3 phase are gathered ，while the squeeze casting process contributes to the morphology transformation of I-phase into fine lamellar， and the decrement of Mg7Zn3 phase. In the RSC process， with the increase of ultrasonic power applied during the stage of slurry-preparation， α-Mg grains are significantly refined and spheroidized， and the lamellar spacing of eutectic structure is obviously reduced. However， the concentration of eutectic structures appears when ultrasonic power continually is increased to 2 400 W. When the ultrasonic power is 1 600 W， the mechanical properties of the alloy are desirable， where the yield strength， tensile strength and elongation reach 185 MPa， 276 MPa and 6.8%， which are 35.0%， 24.9% and 142.9% higher than those of squeeze casting ones， respectively.关键词：Mg-Zn-Y Alloy;Quasicrystal;Casting Process;Microstructure;Mechanical Properties
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发布时间：2024-05-28 - “最新研究揭示了Ti-43Al-6Nb-1Mo-1Cr-0.2TiB2合金的高温蠕变变形与断裂行为。通过XRD、SEM、EBSD和TEM等技术手段，发现合金的变形速率主要由位错攀移控制，蠕变断裂模式为韧脆混合型断裂。随着温度升高和应力增大，局部韧断区域增加，萌生裂纹数量增多。晶界处的B2相和γ相的界面存在较大的应力集中，容易萌生裂纹。硼化物在蠕变过程中可阻碍位错运动并促进动态再结晶。”摘要：The microstructure of as-cast Ti-43Al-6Nb-1Mo-1Cr-0.2TiB2 alloy was analyzed by XRD and SEM， and the creep tests were carried out at 760~840 ℃ under 240~300 MPa. The deformed microstructure and fracture morphology were observed by SEM， EBSD and TEM to explore the effects of temperature and stress on creep deformation and fracture behavior at elevated temperature. The results reveal that the as-cast alloy exhibits nearly lamellar structure， and the borides are dispersed in the matrix. According to the creep data， the stress exponent n and apparent activation energy Qc of the alloy in the test range are 6.64 and 388.37 kJ/mol， respectively. Meanwhile， it can be inferred that the creep deformation rate of the alloy is mainly controlled by dislocation climb combined with TEM observation. Deformed microstructure and fracture morphology demonstrate that the creep fracture mode of the alloy is dominated by ductile-brittle mixed fracture. With the increase of temperature， the local ductile fracture area is expanded. With the increase of stress， the quantities of crack are increased. EBSD and TEM analysis indicate that great stress concentration occurs at the interface between B2 phase and γ phase at the grain boundary， leading to crack initiation. In addition， borides can hinder dislocation movement and promote dynamic recrystallization during creep.关键词：High Nb-containing TiAl Alloy;Microstructure;Creep;Deformation Behavior;Boride
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发布时间：2024-05-28 - “最新研究发现，对固溶态2055铝锂合金进行预轧制变形，可显著提升其硬度和强度。10%预轧制+155℃×28h峰时效合金的屈服强度和抗拉强度分别比未预轧制合金提高了67%和43%，主要原因是大塑性变形诱导高密度位错促进析出相大量均匀弥散析出。”摘要：Effects of different pre-rolling deformations and aging on microstructure and mechanical properties of 2055 Al-Li alloy in solid-solution state were investigated. The results indicate that the pre-rolling deformation before aging can significantly shorten the peak aging time and improve the hardness and strength of the alloy. When the pre-rolling deformation amount is 0， 3% and 10%， the peak hardness of 2055 Al-Li alloy at 155 ℃ reaches 207.66 HV， 215.31 HV and 220.07 HV aging for 40 h， 30 h and 28 h， respectively. The yield strength and tensile strength of the alloy after 10% pre-rolling + 155 °C × 28 h peak aging reach 562.64 MPa and 622.04 MPa， which are 67%， 21% and 43%， 8% higher than those of peak aging alloy without pre-rolling and 3% pre-rolling， respectively. The enhancement in mechanical properties is attributed to high-density dislocations induced by plastic deformation， promoting uniformly dispersed precipitation of large amounts of phases.关键词：2055 Al-Li Alloy;Pre-rolling Deformation;Aging;Mechanical Properties
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发布时间：2024-05-28 - “在异种铝合金搅拌摩擦焊领域，研究者通过正交试验，发现搅拌头转速对焊接接头强度影响最大，当搅拌头转速为1200r/min、行走速度为200mm/s、下压量为0.1mm时，可获得性能优良的焊接接头，其抗拉强度达到母材的89%以上，伸长率为母材的54%以上。”摘要：The friction stir welding butt experiment was carried out on ZL114 aluminum alloy and 6061 aluminium alloy with thickness of 5 mm. Effects of welding parameters on morphology and mechanical properties of ZL114/6061 dissimilar aluminum alloy friction stir welded joints were investigated. The orthogonal test results indicate that the rotation speed of the stirring head has the greatest influence on the strength of the welded joint， followed by the walking speed of the stirring head， and the reduction rate has the least influence. With the rotation speed of 1 200 r/min， walking speed of 200 mm/s， and the reduction rate of 0.1 mm， the desirable performance of the welded joint can be obtained， where the average tensile strength and elongation are 285 MPa and 9.17%， which reach over 89% and 54% of those of base metal， respectively. The grain distribution in weld nugget zone is fine， while that in thermal affected zone is slender and reaches the lowest hardness. The tensile fracture type of welded joint is characterized by ductile-brittle mixed fracture.关键词：Dissimilar Aluminum Alloys;Friction Stir Welding;Tensile Strength;Orthogonal Experimental Design;Mechanical Properties
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发布时间：2024-05-28
Research·Alloy Process
- “最新研究揭示了Al-xCe和Al-8Ce-yNi合金的微观结构和力学性能。随着Ce和Ni含量的增加，合金的枝晶尺寸减小，共晶团网状结构形成，显著提高了室温和高温下的抗拉强度。”摘要：The microstructures and properties of Al-xCe （x=6，8，10，12， %） and Al-8Ce-yNi （y=2，3，4，5，6， %） alloys were investigated by means of OM， SEM， XRD and EDS. The results indciate that with the increase of Ce content， the α-Al dendrites are refined significantly， and the volume fraction of eutectic Al11Ce3 phase is increased. With Ce content of 12%， the coarse primary Al11Ce3 phase is formed. With the increase of Ni content， the range of solid-liquid phase zone in Al-8Ce-yNi alloy is narrowed， and the compositional undercooling degree of the solid-liquid interface of α-Al crystal is increased， leading to the branching acceleration of α-Al crystal. As a result， the dimension of α-Al dendrites is refined， meanwhile， the ternary eutectic group network structure composed of Al3Ni and Al11Ce3 is generated. The tensile strength of Al-8Ce-yNi alloys at room temperature and elevated temperature （350 ℃） reach the maximum values of 189 MPa and 72 MPa， respectively， when the Ni content is 6%.关键词：Heat-resistant Al-Ce Alloy;Microstructure;Mechanical Properties
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发布时间：2024-05-28 - “最新研究发现，在Al-5.5Mg-0.3Mn合金中复合添加微量Sc和Zr元素，能有效降低合金晶间腐蚀和应力腐蚀敏感性，为铝合金材料的耐腐蚀性能提升提供了新思路。”摘要：Al-5.5Mg-0.3Mn-0.2Sc-0.1Zr alloy was prepared by adding trace Sc and Zr to Al-5.5Mg-0.3Mn alloy， and effects of Sc and Zr on sensitized corrosion behavior of Al-Mg-Mn alloys were investigated by intergranular corrosion as well as stress corrosion combined with OM， SEM and EBSD microscopic observation. The results indicate that the grain size of Al-Mg-Mn alloy is refined， and recrystallization can be inhibited by Sc and Zr， increasing the dislocation density and the proportion of low angle grain boundary of the sheet. The grain boundary is optimized， and the precipitation and distribution of β phase during sensitized heat treatment process are improved， thus reducing the sensitivity of intergranular corrosion and stress corrosion.关键词：Al-Mg Alloy;Micro-Alloying;Sensitized Heat Treatment;β Phase;Corrosion Resistance
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发布时间：2024-05-28 -
Effects of Grain Distribution on Mechanical Properties of AZ80 Magnesium Alloy at Room Temperature AI导读
“在材料科学领域，研究者通过高温等通道转角挤压法制备了多类型AZ80变形镁合金。分析表明，A型双峰组织镁合金具有更高的屈服强度、抗拉强度和伸长率，其强化效果优于B型双峰组织。这一发现为镁合金的微观组织优化提供了新思路。”摘要：Multiple types of AZ80 deformed magnesium alloy were prepared by high temperature ECAP. The microstructure characteristics of magnesium alloy was analyzed by metallographic microscope （OM） and scanning electron microscope （SEM） to investigate the influence of grain distribution on mechanical properties of magnesium alloy at room temperature， and the strengthening mechanism of bimodal microstructure was explored. The results indicate that the yield strength， tensile strength and elongation of 17.5% of type A bimodal magnesium alloy are 226.1 MPa， 454.3 MPa and 17.5%， respectively， with average grain size of 80 μm， which are higher than those with 4 μm（215.4 MPa， 438.0 MPa， 14.0%）. The strengthening effect of type A bimodal structure is better than that of type B， and the strengthening effect of fine grains is between the two.The excessive grain refinement of type B bimodal structure can destroy the strengthening effect of bimodal structure.关键词：Mg Alloy;Grain Distribution;Bimodal Microstructure;Strengthening Mechanism- 23
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发布时间：2024-05-28 - “最新研究发现，MoNbVTax合金的高温抗氧化性能随Ta含量增加而提高，Ta氧化物的化学稳定性和致密度有助于抑制氧化层的扩散开裂。”摘要：The oxidation test of MoNbVTax（x=0、0.3、0.5、0.7 and 1） was carried out for different duration under atmosphere at 800 ℃， and effects of oxidation time and Ta contents on oxidation behavior and mechanism of the alloy were investigated. The results indicate that with increasing in oxidized time， the melt or vaporization of oxydate occurrs， leading to the thickening and cracking of oxidation layer.As Ta content increases， the unique slow diffusion effect of high entropy alloy is enhanced， and the diffusion of oxygen elements is suppressed， reducing volume fraction of V-rich area or easily oxidized region， as well as diffusion channel of oxygen， resulting in the enhancement of high temperature oxidation resistance. Moreover， Ta oxide possesses a higher chemical stability to reduce the cracking tendency， which improves the density of oxide layer and inhibits the diffusion cracking of oxidation layer.关键词：Refractory High Entropy Alloy;High Temperature Oxidation Behavior;Anti-oxidation Mechanism
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发布时间：2024-05-28 - “在形状记忆合金领域，研究人员建立了三维相场模型，模拟并预测了Cu-Al-Ni合金在外加载荷下的马氏体逆相变，验证了外加载荷对弹性应变能的作用，为理解外加载荷对马氏体逆相变的影响提供了新见解。”摘要：A three-dimensional phase field model with different martensite variants was established to simulate and predict the reverse martensite transformation in Cu-Al-Ni shape memory alloy under extra load. Effects of extra load on elastic strain energy were verified， and effects of extra load on reverse martensite transformation were explored. The results indicate that the tensile and compression loads can hinder the process of reverse martensite transformation in Cu-Al-Ni shape memory alloy， which is attributed to the release of elastic strain energy stored in the martensite transformation by tensile and compression load. In addition， phase field simulation and calculation demonstrates that the release effect of compression load on elastic strain is superior to that of the tensile load.关键词：Phase Field Simulation;Reverse Martensite Transformation;Cu-Al-Ni Alloy;Elastic Strain Energy
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发布时间：2024-05-28 - “最新研究发现，Al-Al2Cu共晶合金在不同温度和时间的时效处理后，其微观结构和蠕变性能发生显著变化。实验结果表明，共晶合金的高温变形抗力主要由Al2Cu层控制，为合金的高温应用提供了重要指导。”摘要：The evolution of microstructure and nanoindentation creep behaviors of α-Al layer and Al2Cu layer in Al-Al2Cu eutectic alloy after different aging treatments was investigated by X-ray diffractometer and optical microscope. The results reveal that blocky Al2Cu phases are formed in the eutectic alloy after aging at 273 ℃ for different durations， of which the amounts are increased with aging time. After aging at 195 ℃ and 273 ℃ for different durations， the creep stress indexes and thermal activation volumes of α-Al layer and Al2Cu layer are changed， indicating that the deformation resistance of eutectic alloy under high-temperature environment is dominated by Al2Cu layer.关键词：Eutectic Alloy;Ageing Treatment;Nanoindentation Creep;Deformation
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发布时间：2024-05-28
Research·Alloy Performance
- “在增材制造领域，研究者采用有限元分析法，成功制造并验证了动力端高温轴流涡轮组件。试验结果证实，增材制造的涡轮在高温和超转速条件下可安全工作，满足工作要求，为增材制造高温合金涡轮技术提供了可行性验证。”摘要：The strength of additive manufactured axial flow turbine was investigated based on finite element analysis method， and high-temperature axial flow turbine components in power end were formed by additive manufacturing technology， which was verified by overturn test. The results indicate that the maximum deformation values of axial flow turbines by additive manufacturing all appear at the tip of the blade. The maximum equivalent stress value of turbine surface is close to the ultimate yield strength of GH4251 superalloy （830~923 MPa）， while far away from the ultimate tensile strength （1 150~1 400 MPa）， which meets the working requirements of axial flow turbines. The turbine can run safely for 5 minutes at 650 ℃ and 115% of designed rotating speed， and the fluorescence and size inspection meet the requirements of navigation beacon， verifying the feasibility of additive manufacturing of superalloy axial flow turbine.关键词：Additive Manufacturing;Axial Flow Turbine;Finite Element Analysis;Overspeed Test Verification
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发布时间：2024-05-28
Research·Additive Manufacture
- “在非晶复合材料领域，通过调控Al含量，研究了［（Zr0.5Cu0.5）99.5-xAlxSn0.5］0.97Ta3合金的微观组织及力学性能变化规律，为合金组织与性能的可调可控提供了解决方案。”摘要：The microstructure and mechanical properties of ［（Zr0.5Cu0.5）99.5-xAlxSn0.5］0.97Ta3 （molar ratio） amorphous alloy matrix composites with multiple reinforcing phases were investigated by adjusting Al content （x=5，6，8）. The results indicate that Al content affects the glass formation ability of matrix. With the increase of Al content， the glass formation ability of system is increased firstly and then decreased. The variation of glass formation ability has a corresponding effect on content and dimension of the multi-phase reinforcing structure during solidification， thus affecting the yield strength and plastic deformation of amorphous composites. Therefore， the composition can be selected according to different performance requirements to achieve the adjustability and controllability of microstructure and properties.关键词：Amorphous Composites;Glass Formation Ability;Multi-phase Reinforcing;Strength and Toughness
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发布时间：2024-05-28 - “在非晶复合材料领域，研究人员通过向Cu-Zr-Al-Sn体系中添加Ta元素，成功制备了多相增强CuZr基非晶复合材料。研究发现，富Ta相可作为B2-CuZr相的有效异质形核基底，调控其析出量、尺寸和分布，从而显著提高合金的力学性能。当Ta含量为5%时，复合材料的抗压强度达到2214 MPa，塑性应变达到4.3%。这一研究为非晶复合材料的制备提供了新思路。”摘要：In view of the uneven precipitation and large size of B2-CuZr phase in Cu-Zr-Al-Sn amorphous composites， Ta was added to the system， and heterogeneous nucleation and uniform dispersion of B2-CuZr phase was promoted through precipitation of Ta phase with high melting point， to obtain multi-phase reinforced CuZr-based amorphous composites. The evolution law of microstructure and properties of the composites with different Ta contents was systematically investigated. The results indicate that the introduced Ta-rich phase acts as an effective heterogeneous nucleation site for B2-CuZr phase， and regulate the precipitation amount， dimension and distribution of B2-CuZr phase， to generate multi-phase reinforcing structure to effectively enhance mechanical properties. With the increase of Ta content， the yield strength is decreased gradually， and plastic deformation ability is increased firstly and then decreased. The tensile strength and plastic strain of ［（Cu0.5Zr0.5）0.925Al0.07Sn0.005］97Ta5 amorphous composite with optimal performance reach 2 214 MPa and 4.3%， respectively.关键词：Amorphous Composites;Multi-phase Reinforced Structure;Ambient Plasticity
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发布时间：2024-05-28
Research·Composites
- “在铝电解领域，研究人员通过真空熔炼法制备了Cu-Ni-Fe-8Al合金，并添加不同La含量，研究了Al、La的添加对合金微观组织结构及电解腐蚀性能的影响。结果表明，添加Al元素和微量稀土La的Cu-Ni-Fe-8Al-La合金有望成为惰性阳极铝电解用备选阳极材料。”摘要：In order to solve the problems of high temperature oxidation and poor corrosion resistance of the inert anode of Cu-Ni-Fe alloy during the process of aluminum electrolysis， Cu-Ni-Fe-8Al alloy was fabricated by vacuum smelting method. Moreover， Cu-Ni-Fe-8Al-xLa （x =0、1 and 2） alloys with different La contents were prepared， and the effect of La addition on microstructure and electrolytic corrosion performance of Cu-Ni-Fe-8Al alloy were investigated. The results indicate that aluminate is formed during the process of high temperature electrolysis after Al addion， inhibiting the external diffusion of Cu. The addition of rare earth La enhances the associativity between oxide film and matrix， further reducing the corrosion loss of anode material， while excessive addition of La can accelerate the corrosion of Cu-Ni-Fe alloy to a certain degree. Therefore， Cu-Ni-Fe-8Al-La alloy with proper amount of Al and trace La is expected to be an alternative anode material for inert anode aluminum electrolysis.关键词：Rare Earth La;Inert Anode;Aluminium Electrolysis;Corrosion
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发布时间：2024-05-28
Application·Investment Casting
- “在汽车发动机前盖制造领域，专家通过理论设计、模拟分析和试模调整，成功优化了浇注系统和排溢系统，提高了产品品质和模具稳定性。”摘要：The shape， structural features and technical requirements of automobile bonnet product were analyzed， and the casting system and overflow system were designed. Meanwhile， the calculation method was adopted to design the dimensions of the inner gate， runner and overflow slot. On the basis of theoretical design， AnyCasting software was used to simulate the casting process. Finally， through the inspection of quality after the mold test， the size of the overflow was tailored slightly . The gating system and overflow system were determined by theoretical calculation， simulation analysis and mold trial adjustment. The product quality is high and the mold operation is stable and reliable by batch product verification.关键词：Bonnet;Gating System;Overflow System;Simulation Analysis
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发布时间：2024-05-28 - “在铝合金材料性能研究领域，专家通过测量差压铸件不同区域的二次枝晶间距并进行疲劳试验，建立了疲劳寿命、应力与二次枝晶间距的定量关系，为提高铝合金材料性能预测准确性提供了解决方案。”摘要：Due to the complex structure and non-uniform solidification conditions of counter pressure casting， the distribution of secondary dendrite arm spacing in the castings exhibits apparently difference， which leads to different properties at different areas. At present， finite element analysis in the product design stage uses uniform material fatigue model， resulting in deviation between simulation and test results. The secondary dendrite arm spacing measurement and material fatigue tests were carried out at different areas of counter pressure castings to evaluate the quantitative relationship between fatigue life， stress and secondary dendrite arm spacing of alloy， and then the S-N curves corresponding to different secondary dendrite arm spacing were obtained. Experimental tests validate that the prediction results of the quantitative relationship are in good agreement with the experimental ones， and the maximum absolute value of the logarithm relative error of predicted fatigue life is below 2%. Meanwhile， crack initiation and propagation mechanism were expounded by scanning electron microscopy （SEM） observation.关键词：Counter Pressure Casting;A356 Alloy;Secondary Dendrite Arm Spacing;Fatigue Properties
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发布时间：2024-05-28
Application·Die Casting
- “在铝合金性能研究领域，专家通过消失模铸造ADC12铝合金，发现机械振动条件可显著影响合金性能。随着振动峰值加速度的增加，合金液产生对流，晶粒细化，抗拉强度在特定振动频率和振幅下达到最大，为铝合金性能优化提供新思路。”摘要：The effect of different mechanical vibration conditions on properties of aluminum alloy castings by lost foam casting was investigated. The results indicate that with the increase of peak acceleration of mechanical vibration， convection is generated in aluminum alloy melt to induce dendrite breakage， and the amounts of nucleation are increased continuously with refined grain. The tensile strength of aluminum alloy is increased with the increase of vibration frequency and amplitude， reaching the maximum value at vibration frequency of 100 Hz and amplitude of 0.08 mm. However， with the further increase of vibration frequency and amplitude， the tensile strength of aluminum alloy is gradually reduced.关键词：Aluminum Alloy;Mechanical Vibration;Lost Foam Casting;Casting Performance
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发布时间：2024-05-28
Application·Lost Foam Casting
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