最新刊期
卷 40 ， 期 9 ， 2020
- 摘要：The energetics,geometrical and electronic structures of L12-Co3X（X =Ti,Ta,Al,W,V）intermetallic compound and its point defective constructions were calculated by first-principles pseudopotential plane-wave method.Based on the calculation and comparison about the heat of formation and the energy of formation for VX、VCo、CoX、XCopoint defective structures,the type and the geometrical configuration of point defects in L12-Co3X（X=Ti,Ta,Al,W,V）intermetallic compound were analyzed.The results reveal that the major point defects in L12-Co3X（X=Ti,Ta,Al,W,V）intermetallic compound are anti-site defect both in the Co sublattice or in the X sublattice.In rich-Co alloy it is mainly Co anti-site defect,whereas in rich-Xalloy it is mostly Xanti-site defect,consistent with L12-Ni3 Al alloy.Based on the analysis of the total electronic density of states（DOS）for the L12-Co3X（X=Ti,Ta,Al,W,V）crystal model including VX、VCo、CoX、XCopoint defective structures,the calculated results were verified objectively.关键词：Cobalt Base Superalloy;Point Defect Structures;Plane-wave Pseudopotential Method
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发布时间：2023-12-18 - 摘要：Friction stir welding of low Cu and high strength Al-Zn-Mg-Cu alloy plate was carried out at 300 r/min and 900 r/min.The microstructure and mechanical properties of the welded joints were analyzed by means of metallographic microscope,scanning electron microscope,transmission electron microscope,Vickers hardness and tensile test.The results show that there is absence of obvious change of micrometer AlMnCr phase during the welding process,and the dissolution and coarsening occur in intracrystalline nanoscale MgZn2 phase and grain boundary submicron MgZn2 phase.With the increase of welding speed,the degree of precipitate dissolution is increased,and the grain size of welded joint tends to be increased.Under the combined action of grains and precipitates,the hardness of the welded joints of the alloy is characterized by approximate U-shaped distribution.The hardness of the heat affected zone on the advancing side is slightly lower than that on the retreating side,and that of the welding nugget and heat affected zone is relatively low,which is the fracture position of the welded joints,presenting zigzag fracture shape affected by the "S" line defect.The welded joints of low Cu and high strength AlZn-Mg-Cu alloy have the better properties under the low rotational speed of 300 r/min.The maximum tensile strength,yield strength,elongation and welding coefficient reach 393 MPa,261 MPa,12% and 80%,respectively.关键词：Al-Zn-Mg-Cu Alloy;FSW;Welding Rotational Speed;Mechanical Properties;Microstructure
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发布时间：2023-12-18 - 摘要：The semi-continuous casting ZL205 Aaluminum alloy ingot was treated by different ultrasonic treatment at 720℃.Three groups of experiments were designed by adjusting ultrasonic action time（2、4、6、8、10 min）and ultrasonic power（0、100、120、140、160、180、200 W）to analyze effect mechanism of different ultrasonic field parameters on the solidification microstructure of ingots and to determine the optimal ultrasonic process parameters.The results show that the ultrasonic effect on the semi-continuous casting ZL205 Aaluminum alloy melt can promote the homogeneity of the eutectic structure distribution,significantly refining the grains and improving the comprehensive mechanical properties of the ingot.Ultrasonic energy can refine effectively intermetallic compounds,improving the formation and uniform distribution of intermetallic compounds,thereby increasing the nucleation rate,which is responsible for significantly improving the quality of the ingot.With a given ultrasonic power,the optimal ultrasonic action time is 10 min,and with a fixed ultrasonic action time,the optimal ultrasonic power is 160 W.The optimal ultrasonic process parameters can be obtained by three groups of experiments:ultrasonic action time of 10 min and ultrasonic power of 160 W.关键词：Semi-continuous Casting ZL205AAluminum Alloy;Solidification Structure;Ultrasonic Process Parameters;Melt;Nucleation Rate
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发布时间：2023-12-18 - 摘要：The effects of two imported refiners,Al-5Ti-1B and Al-3Ti-0.15C,on the microstructure of 2026 ingots and extrusion profile as well as extrusions properties were investigated.The results reveal that the refinement effect of Al-5Ti-1B grain refiner is better than that of Al-3Ti-0.15C grain refiner at the same amount of 0.2% addition.The grain size of ingots and extrusions adding Al-5Ti-1B grain refiner is smaller than that of the comparative sample.The strength of extrusion profile adding Al-5Ti-1B grain refiner is slightly higher than that of one adding Al-3Ti-0.15C grain refiner,while the elongation is reduced slightly.关键词：Al-5Ti-1B Grain Refiner;Al-3Ti-0.15C Grain Refiner;2026 Aluminum Alloy;Grain Refinement
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发布时间：2023-12-18 - 摘要：The solidification structure and mechanical properties of CuAlMn shape memory alloy were improved with the help of compound field（combination of power ultrasonic field and rotating electromagnetic field）and TiB2 nanoparticles.The effects of compound field and TiB2 nanoparticles on solidification structure and mechanical properties of CuAlMn shape memory alloy were investigated by SEM and optical microscope.The results show that compound field can effectively inhibit the agglomeration of TiB2 nanoparticles,improving the grain refinement effect of TiB2 nanoparticles.The grain size of the CuAlMn shape memory alloy ingot can be refined from 1.62 mm to 0.32 mm with adding 1% TiB2 nanoparticles and applying compound field simultaneously.Accordingly,the tensile properties of the alloy are significantly improved,where tensile strength and elongation are increased to 691 MPa and 19.7%,respectively.关键词：Compound Field;TiB2 Nanoparticles;CuAlMn Shape Memory Alloy;Grain Refinement
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发布时间：2023-12-18 - 摘要：3D printing technology in sand casting has many advantages over the traditional process.The application and research status of 3D printing in sand mold casting industry were reviewed.The principle and forming influence factors of widely used selective laser sintering（SLS）and three dimensional printing（3DP）were described.The application of 3D printing in the foundry industry was introduced.And the development trend of 3D printing technology in foundry industry was analyzed in terms of materials and process.关键词：3D Printing;Sand Casting;Application and Development
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发布时间：2023-12-18 - 摘要：The research progress in Al3Sc/Al3(Scx,M1-x)particles in the scandium-containing aluminum alloy under the multi-component system was reviewed.Al3Sc/Al3(Scx,M1-x)particles is the key to improve the performance of the scandium-containing aluminum alloy.Al3Sc/Al3(Scx,M1-x)particles can be acted as the grain heterogeneous nuclei when the alloy liquid is solidified,so that the influence of the dendrites is weakened or eliminated,and as-cast crystal grains are also refined.Al3Sc/Al3(Scx,M1-x)particles can be also precipitated dispersively during deformation and heat treatment of aluminum alloy,thus inhibiting the nucleation and growth of recrystallized grains.It can also increase the recrystallizing temperature of the alloy,pining dislocation and subgrain boundary,hindering and preventing dislocation movement and subgrain boundary migration and merging,which improve the strength of the alloy.In multicomponent alloy system,the nucleation and growth of Al3Sc/Al3(Scx,M1-x)particles are much more complex than that of Al3Sc particles,so it is difficult to predict theoretically according to LSW model in most cases.The research methods of nucleation and growth of Al3(Scx,M1-x)particles were also summarized,of which the calculation method is an effective method to understand the nucleation and growth of Al3Sc/Al3(Scx,M1-x)particles.关键词：Al3Sc/Al3(Scx,M1-x)Particles;Scandium Containing Aluminum Alloy;Nucleation and Growth;Multicomponent System
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发布时间：2023-12-18 - 摘要：The bimetal composite materials generally have superior comprehensive properties which are extremely difficult to achieve for single metal materials.Comparing to other bimetal bonding processes,the solid-liquid bimetal compound casting process has been widely used in modern industry with the advantages of good interface bonding quality,high production efficiency and wide range of applicable alloys,etc.The research progress and development status on the process and formation mechanism of solid-liquid bimetal compound casting was reviewed at home and abroad.Main forming processes subdivided within the solid-liquid bimetal compound casting and the corresponding applications were described.Meanwhile,the major factors affecting the bonding quality of the bimetal interface were analyzed.Research concerns and mainstream opinions were summarized on the microstructure and properties at the bonding interface of the solid-liquid bimetals.Finally,the shortcomings existed in the current research on solid-liquid bimetal compound casting and development directions forwards were pointed out.关键词：Solid-Liquid Bimetal;Compound Casting;Interface Bonding Mechanism;Microstructure and Properties
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发布时间：2023-12-18 - 摘要：There are still metallurgical defects in the Ti-Al based alloy ingots caused by the inadequate control in the practical EBCHM production,which is harmful for the quality of subsequent titanium products.To ensure that EBCHM titanium alloy ingot meets the composition design standard,numerical models can be established based on cooling bed and crystallizer to calculate the evaporating loss of each element during the casting process.Therefore,the complement system of each element was designed,and the concentration gradient caused by evaporation was balanced,which restrained the macro-segregation of ingots.The research status of macro-segregation control mechanism at home and abroad was reviewed,which provided the guidance for the key issues of titanium industry chain upstream production.关键词：Ti-Al Based Alloy;EBCHM;Composition Segregation Control;Numerical Simulation
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发布时间：2023-12-18 - 摘要：<正>近日,爱柯迪股份有限公司（以下简称"爱柯迪"）公布称,公司全资子公司爱柯迪（柳州）科技产业有限公司（以下简称"爱柯迪（柳州）科技"）以人民币1425万元竞得柳州市柳东新区花岭片区L-19-42地块60 413.73 m2的国有建设用地使用权。爱柯迪（柳州）科技与柳州市自然资源和规划局签署《国有建设用地使用权出让合同》,并于2020年8月4日双方完成签章流程。2020年3月2日,爱柯迪曾发布公布表示拟与柳州市柳东新区管理委员会签署《柳东新区汽车轻量化铝合金精密压铸件项
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发布时间：2023-12-18 - 摘要：<正>近日,郑州轻研合金科技有限公司（以下简称"郑州轻研合金"）成功开发出超高强铝锂合金并实现工业化批量生产,合金抗拉强度为695 MPa、屈服强度为566 MPa,伸长率超过6%。当前铝锂合金中主要应用的第二代Al-Mg-Li合金和第三代Al-Cu-Li合金强度分别在400-500 MPa和500～600 MPa,而郑州轻研合金采用具有自主知识产权的全新
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发布时间：2023-12-18 - 摘要：<正>浙江万丰奥威汽轮股份有限公司近日表示,公司子公司已取得特斯拉Model Y供应商订单,为其供应镁合金座椅支架、座椅骨架冲压件等产品服务。目前在合作的新能源主机厂有蔚来、小鹏、比亚迪、恒大新能源汽车等。公司铝合金车轮已供应比亚迪,配套供应量将随着其销量的增加而增加。
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发布时间：2023-12-18 - 摘要：<正>近日,西南铝技术中心与上海交通大学凝固科学与技术研究所就实现铝合金熔体在线净化提升开展探究试验,此次试验由上海交通大学疏达教授带领技术团队和试验设备到技术中心试制中心完成。据了解,疏达教授团队为实现绿色低碳环保,提高合金材料综合性能,一直在从事铝合金熔体在线净化领域课题研究,已取得多个国家级创新成果。
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发布时间：2023-12-18 - 摘要：<正>2020年8月最后一周,受下游需求持续疲弱影响,部分工厂因去库存及回笼资金需求而小幅让价争取订单,镁市承压延续下延,至8月28日,99.9%镁锭府谷地区工厂报主流出厂含税现金价格1.265万元/t,成交价格1.260～1.265万元/t,较8月第三周周五再度回落100元/t,其他地区跟随调整。至此,上周镁价再创年度新低,并刷新
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发布时间：2023-12-18 - 摘要：<正>近日,一汽联铸二厂压铸增能项目竣工暨力劲大型智能压铸单元交付仪式,在长春一汽联合压铸有限公司二工厂隆重举行。据悉,该项目于2020年1月启动,目前已具备批量生产的能力,可年产压铸件3 000 t、150万件。项目满足了一汽红旗、一汽大众的增产要求。长春一汽联合压铸有限公司二工厂压铸增能项目,主要包括:1台3 000 t压铸机、1台1 600 t压铸机、3台800 t压铸机以及压铸所需的公共动力设施设备,整个压铸过程
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发布时间：2023-12-18 - 摘要：<正>近日,广西南南铝加工有限公司（以下简称"南南铝加工"）IT半导体任务型团队开发的泛半导体用6XXX合金铝材成功通过业内主力OEM厂商的全套验证,材料各项性能与进口铝材相当,部分性能甚至优于进口材料。高端铝材是泛半导体设备行业的关键基础材料,由于泛半导体设备苛刻的使用要求,泛半导体设备高端铝材几乎完全依赖进口,极容易受外部环境变化的影响,因此成为了泛半导体行业的"卡脖子"材料,严重影响了国内泛半导体行业快速自主发展。
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发布时间：2023-12-18 - 摘要：Considering the material nonlinearity features,the temperature field,stress field and displacement field of plasma cladding Q235 steel were simulated by thermo-mechanical coupling based on ABAQUS finite element method of life and death and Goldak heat source model.The real residual stress was measured by blind hole method.The results reveal that the Goldak model can simulate the plasma heat source well and the simulated results are stable,which is consistent with the actual cladding testing.In Xand Zpaths,the calculated value of residual stress is consistent with the variation trend of measured one.The maximum difference between the measured value and simulated one of longitudinal residual stress along X path is 43 MPa,and the average value is 6.2 MPa.There exists some deviation along the Z path,however,the overall trend tends to be consistent.The average simulated value of longitudinal residual stress is-189.54 MPa,while the average measured value is-211.5 MPa.After completion of cladding,the maximum deformation is 0.05 mm,which appears in the center of cladding layer,and the deformation of Q235 steel matrix is less than 0.01 mm.关键词：Q235 Steel;Plasma Cladding;Temperature Field;Residual Stress;Deformation;ABAQUS Software
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发布时间：2023-12-18 - 摘要：A three dimensional cellular automaton-finite element model was established to predict the solidification grain structures of large size blade of heavy gas turbine.The results reveal that the deviation angle and divergence angle of columnar grains are small and columnar crystal is fine when assembled with root down,meanwhile,grain size of blade root is fine,while grain size of blade top is coarse.However,the deviation angle and divergence angle of coarse columnar grain are large when assembled with tip down,meanwhile grain size of blade root is coarse,while grain size of blade top is fine.In addition,the effects of withdrawal rate on solidification structure are independent on the assembled modes.With the withdrawal rate increasing,the columnar grain size and angle of deviation and divergence are decreased.The numerical simulation results are in good agreement with the experimental ones.关键词：Heavy Gas Turbine;Large Size Blade;Directional Solidification;Deviation Angle;Divergence Angle
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发布时间：2023-12-18 - 摘要：Through the analysis of the structural characteristics and secondary processing technology of the die casting gearbox intermediate plate,it is found that the main factors affecting the insufficient engineering capacity of the product include the accuracy of the turntable,the rigidity of the tool,and the thermal variation error of the machining center.Through research and practice,a way to improving the rigidity of cutting tools was presented.In addition,the on-line detection technology was used to discover the influence of the accuracy of the turntable and the thermal variation error of the machining center on the reference point position of the workpiece in time.Then the information was fed back to the machine tool,so as to effectively control the change of the workpiece position degree in a reasonable range,with finally meet the requirements of the product processing engineering capacity.关键词：Die Casting Gearbox Intermediate Plate;Secondary Cutting;Engineering Capacity
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发布时间：2023-12-18 - 摘要：Aiming at the development trend of lightweight and integrated automobile engines,the key points of a new type of oil pan die casting were described.It was divided into three parts from the key points of the die casting design technology.Some measures,including different aluminum liquid pouring methods,diversified process and super-point cooling applications,were used to design and manufacture products.Each factors affecting product quality fluctuations in the production process were monitored from the main points of the die-casting process control to make manufacturing intelligent.Through these two aspects of control,product quality rate reaches over 97%,achieving batch production and stable production.关键词：Oil Pan;Die Casting Technology;High Vacuum;Process Control
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发布时间：2023-12-18 - 摘要：The microstructure and mechanical properties of large section zinc alloy worm gear were investigated by metallographic microscope and universal testing machine,and the pin-hole degree in the section face of the double-squeezing castings was evaluated.The optimized double extrusion casting process parameters of ZA27 worm wheel selected were presented as follows:holding temperature of 600～650 ℃,mold preheating temperature of 200～250℃,mold closing speed of 5～10 mm/s,main and auxiliary punch at the specific pressure of 70～100 MPa for 50～100 sand then auxiliary punch at the specific pressure of 50～70 MPa began to pressurize the worm wheel flange for 50～120 s.The results show that ZA27 worm gear with uniform microstructure and properties can be obtained by double extrusion casting.Compared with those of ones by gravity casting,the tensile strength and elongation of double extrusion worm gear are increased by 27%and by 100%,respectively,and the pinhole degree is increased by more than 1 grade.关键词：Large Section;Zinc Alloy Worm Gear;Double Extrusion Casting
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发布时间：2023-12-18 - 摘要：The Si content in different regions of the low-pressure die-casting A356 aluminum alloy wheel was analyzed by X-ray fluorescence spectrum,and the mechanism of macro segregation was investigated by means of scanning electron microscope and metallographic microscope.The results reveal that the content of Si in the wheel is decreased gradually from top to bottom,and the content of Si in the surface layer of the sample is significantly higher than that in the center,especially in the hot spot.The macro-segregation is related with the co-action of the gravity,pressure and temperature.关键词：Aluminum Alloy Wheel;Low-pressure Die-casting;Si Element;Macro Segregation
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发布时间：2023-12-18 - 摘要：<正>特斯拉CEO马斯克日前在社交平台上表示,公司费利蒙市（Fremont）工厂的压铸机挤压力目前全球最高。据信,特斯拉费利蒙工厂为Model Y准备的压铸机（casting P machine）已安装好。马斯克则称,该压铸机,可以让车身后部一体成形,包括防撞梁。特斯拉高管陶琳则表示,特斯拉这款产品使用
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发布时间：2023-12-18 - 摘要：<正>据海德鲁消息,最近由挪威多家机构联合完成的一项新的研究表明,在挪威新建的沿海公路建设中,铝将是一种成本低、气候适应性好的桥梁建造材料,是可以采用的钢材替代方案。海德鲁和一个由著名结构工程师、商业专家和研究人员组成的外部团队调查研究了用铝代替传统钢材作为长吊桥梁建造材料的可行性和成本。海德鲁挤压解决方案市场经理Thomas B.Svendsen表示:"这项研究令人鼓舞,并有可能成为未来桥梁建设
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发布时间：2023-12-18 - 摘要：The graphite morphology,base structure and mechanical properties of common grey cast iron（HT200）and inoculated cast iron（HT250）in LFC and in clay sand casting were investigated.The results show that the microstructure and mechanical properties of EPC are different from those of clay sand casting under the same chemical composition and pouring conditions.The A-shaped flake graphite formed by LFC is more coarse and longer,and the content of ferrite in the matrix is increased,and both the tensile strength and hardness are lower than those of clay sand casting.Therefore,the corresponding strengthening measures should be taken into account according to the casting structure,wall thickness,casting brand requirements and production conditions to ensure the mechanical properties of the castings when LFC process is adopted.关键词：Lost Foam Casting;Gray Cast Iron;Structure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：The application technology of ceramic core in superalloy precision casting process was described.The factors influencing the design of ceramic core structure and entering inspection items were discussed by means of computer simulation.Characteristics of ceramic core stress and deformation during wax injection were predicted.The bending strength of the ceramic core in various processes of investment casting was measured,and the overall dimensional change of the ceramic core in the residual wax burning and casting process was investigated,which provided a complete method of correctly employing ceramic core in investment casting process and revealed the "black box" of ceramic cores as well.关键词：Ceramic Core;Investment Casting;Superalloy;Ceramic Shell
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发布时间：2023-12-18 - 摘要：In order to solve the instability of wax pattern and irregular deformation of investment castings in the manufacture of auto radiator bracket,which affected the assembling,the reverse deformation core was designed,and the auxiliary fixture was applied for shape correction in wax pattern and investment castings.The final process proposed can fully meet the requirements of batch production.关键词：Investment Casting with No Allowance;Reverse Deform;Shape Correction
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发布时间：2023-12-18 - 摘要：Based on the principle of rapid casting and selective laser sintering（SLS）technology,an investment casting test model of ZTC4 alloy was established.The temperature field and solidification process were analyzed by the ProCAST finite element analysis software,and the grain structure and grain growth were analyzed by CAFmodule.Meanwhile,the microstructure was characterized and mechanical properties were measured by SEM,EDS and tensile testing.The results reveal that adopting the bottom gating system with vacuum pouring,the solidification sequence presents from outside to inside without slag inclusion defect inside.The cooling rate at the top of the sample is lower than that at the bottom,and the average cooling rate is 1.26℃/s.Widmanstatten structure mainly composed of whiteαphase,blackβlamellae andαphase at the grain boundary is distributed at the micro level.Larger grain size affects the mechanical properties,presenting high strength and low plasticity.The average yield strength and tensile strength of the alloy reach 785.67 MPa and 937.55 MPa,respectively,and the elongation and section shrinkage rate are 14.83% and 19.33%,respectively.The comprehensive properties meet the requirements of GB/T 6614-2014 national standard for titanium and titanium alloy castings and industrial production.关键词：ZTC4;Rapid Investment Casting;Grain Growth;Cooling Rate;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：Based on the ancient lost-in-fire method,the natural plant metal artworks were prepared by using gypsum surface layer and reinforcement layer instead of traditional clay.The results show that the slurry prepared with 50% α-hemihydrate gypsum and 50% bauxite as matrix materials and 80% ferrous sulfate and 20% sodium pyrophosphate as additives presents loose microstructure,which can reduce the strength of the shell and improve the broken shell effect.The slurry prepared with 50% silica sol as binder has three-dimensional network structure,which can improve the bending and tensile strength of the gypsum reinforcement layer and prevent the cracking and deformation of the mold.Finally,the casting has the characteristics of realistic modeling and unique.关键词：Lost-in-Fire Method;Gypsum Mould;Natural Plant Metal Artwork
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发布时间：2023-12-18 - 摘要：The cladding Cu/AlCoCrFeNi2.1 HEAs ingot was prepared by continuous casting.The interface of cladding layer of the Cu/AlCoCrFeNi2.1 HEAs ingot was investigated by metalloscope,SEM and mechanical performance testing.The results indicate that the interface of cladding Cu/AlCoCrFeNi2.1 ingot is clean with gas holes and slag free.The absence of interface between the two alloys can be observed,belonging to the metallurgical bonding.The SEM results reveal that the interdiffusion of alloy elements occurs between Cu and HEAs and the diffusion layer is 0.67μm.关键词：High-entropy Alloy;Cladding Ingots;Interface Morphology
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发布时间：2023-12-18 - 摘要：The isothermal constant strain rate compression experiment of Ti60 alloy samples was carried out by Thermecmaster-Zthermal processing simulation machine.The flow stress behavior of the alloy in at 600～950℃and 0.001～10 s-1 was investigated,and the artificial neural network（ANN）constitutive model was constructed.The results reveal that the flow stress of Ti60 alloy is decreased with the increase of deformation temperature and the decrease of strain rate.The flow stress-strain curves of Ti60 alloy is characterized by steady flow type and soft flow type under different deformation conditions.The constitutive model established based on ANN has the satisfied prediction accuracy.The relative error between the experimental value of flow stress and the predicted value is basically ranged within ±5%,and the average relative error is 1.82%,meanwhile,the correlation coefficient tends to 1,which can accurately describe and predict the flow stress behavior of Ti60 alloy.关键词：Ti60 Alloy;Flow Stress Behavior;Artificial Neural Network;Constitutive Model
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发布时间：2023-12-18 - 摘要：The effects of B addition on the content of V and Ti in the Al-melt were analyzed by calculating the compositional variation and precipitation phase of Al-0.064Si-0.106Fe-0.004Ti-0.005V in the process of boronization,and the recommended calculation formula of B addition was put forward.The results show that it is beneficial to improving the solubility of B with increasing the temperature of Al-melt,and the sequence of precipitation phase in the cooling process of boronizing can be expressed as follow:TiB2→VB2.The content of solute V and Ti in the Al-melt can be controlled below 0.000 5% and 0.002 5%,respectively,by controlling the amount of B addition and the temperature of Al-melt,and the reasonable amount of B addition can be calculated according to the initial content of titanium and vanadium.关键词：Boronizing Treatment;Thermodynamics;Purification;Vanadium;Titanium
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发布时间：2023-12-18 - 摘要：The effects of two annealing methods of air cushion continuous annealing furnace and box furnace on the structure and properties of 3003 aluminum alloy were investigated by EBSD and bending experiment.The results show that the annealing process of box annealing furnace is characterized by low temperature and long time,and the precipitated dispersion phase occurs before recovery and recrystallization or simultaneously,leading to the delay of recrystallization,the coarse long strip recrystallization structure and the extremely sharp strong P{011}<111>texture,while the annealing process of the air cushion furnace is characterized by high temperature and short time,which avoids the concurrent precipitated dispersion phase,presenting fine and uniform equiaxed structure.Recrystallization texture becomes more or less random,and the texture of P{011}<111>is relatively weak.The bending performance of the two annealing methods was compared.It is found that the orange peel appears on the surface of the alloy after the box annealing furnace treatment,and the surface of the air cushion furnace sample is relatively smooth with better bending performance.关键词：3003 Aluminum Alloy;Concurrent Precipitation Phase;Recrystallization Texture;Zener Drag;Parti-cle-stimulated Nucleation（PSN）
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发布时间：2023-12-18 - 摘要：Al-Mg-Si-Cu alloy composition was designed,where the main component of w（Mg）/w（Si）is approximately 1.1,and Cu content is controlled within 0.05%～0.10%.The continuous casting and rolling was adopted to produce the aluminum alloy rod with φ9.5 mm,which was used as a raw material for processing monofilament to improve the conductivity of monofilaments after naturally aging to T4 state.The results show that the aluminum alloy rod can be drawn to produce φ2.92 mm monofilament by 200 ℃×6 haging treatment,which possesses a higher conductivity（conductivity of batch trial production sample ≥32.3 MS/m）.Meanwhile,the tensile strength of the monofilament meets the requirement（≥325 MPa）.关键词：High Conductivity;Aluminium Alloy;High Strength;Aging Treatment
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发布时间：2023-12-18 - 摘要：The microstructure of rolled Mg-Y-Ce-Sn-Zr alloy was obserevd by means of optical microscope（OM）,X-ray diffractometer（XRD）and scanning electron microscopy（SEM）.The effects of Sn on the properties of the alloy prepared were investigated by tensile and hardness test.The results show that with the increase of Sn content,the average grain size in the alloy is decreased firstly and then increased.When the Sn content is 1.5%,the grain refinement effect presents desirable,where grain size is about 12.5μm.The MgYSn phase is increased with the increase of Sn content,and the second phase nucleation（PSN mechanism）promotes recrystallization and changes the crystal orientation,so that the texture strength of the（0002）basal plane is gradually weakened with the increase of Sn,and the alloy plasticity is improved.When Sn content is 1.5%,the comprehensive properties of the alloy are satisfactory,where yield strength,tensile strength,elongation and micro-hardness reach 153 MPa,223 MPa,19.5%and 68.9 HV,respectively.关键词：Mg-Y-Ce-Sn-Zr;Microstructure;Mechanical Properties;Texture
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发布时间：2023-12-18 - 摘要：The composition,preparation process and properties of Al-Mg-Si alloy conductor material were reviewed,and the Al-Mg-Si alloy conductor material was developed.It is pointed out that with the increasing demand of electric power,it will be the future development direction under the condition of meeting the mechanical properties by improving the electric conductivity of aluminum alloy conductor materials.The Al-Mg-Si alloy conductor material will have a wider prospect for development and application due to the diversification of performance-control methods.关键词：Al-Mg-Si Alloy;Conductor Material;Preparation Process;Electric Conductivity;Strength
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发布时间：2023-12-18 - 摘要：Cu-14Fe alloys ingots with different carbon content were prepared by vacuum induction furnace,and the effects of different carbon content on the microstructure of Cu-14Fe alloys was investigated by X-ray diffraction（XRD）,field emission transmission electron microscopy（FE-TEM）and energy spectrum.The results show that the spherical rich-Fe phase in Cu-14Fe is distributed more uniform in copper matrix with carbon addition.The rich-Fe phase exists in form ofα-Fe,and amounts of nano-Cu particles are distributed in the rich-Fe phase.Moreover,carbon element can promote the precipitation of Fe to decrease the solubility of Fe in the copper matrix.关键词：Cu-14Fe Alloy;Carbon;Solubility;Rich-Fe Phase
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发布时间：2023-12-18
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