最新刊期
卷 38 ， 期 9 ， 2018
- 摘要：Effects of ultrasonic cavitation on morphology evolution of second phase in Al-5Ti-1B master alloy were investigated.The results show that the morphology of the second phase in the prepared master alloy is improved significantly under ultrasonic cavitation.With the increase of ultrasound duration,the morphology of TiAl3phase is changed from block to coarse acicular or plate-like,and the agglomeration of TiB2in the grain boundary ofα-Al is distributed more uniformly with a small amount of attached TiAl3.With treating for 120sof ultrasonic vibration,the average size and average area of TiAl3and TiB2are 19.3μm and 14.5μm2,respectively,with more uniform distribution.关键词：Ultrasonic Cavitation;Al-5Ti-1B Master Alloy;Second Phase;Morphology Evolution
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发布时间：2023-12-18 - 摘要：The wrought Mg-Y magnesium alloys with varied yttrium content were fabricated by permanent mold casting and plain compressing.The effects of yttrium content and temperature on mechanical anisotropy of Mg-Y alloys were investigated.The results reveal that the alloy containing Y presents the apparent mechanical anisotropy with compressed along radial（TD）and axial（ED）of cylinder samples of Mg-Y alloys.However,the anisotropy is decreased with increasing in yttrium content and temperature.At room temperature,the difference of strength between TD and ED directions is decreased from 82 MPa to 34 MPa when yttrium content is increased from zero to 3.02%.At 300℃,the two curves of the stress-strain diagram compressed along TD and ED direction almost completely coincide,showing the disappearance of mechanical anisotropy.The decrease of the mechanical anisotropy is attributed to the weakened{0002}basal texture and the activation of non-basal slips with increasing in yttrium and temperature.关键词：Mg-Y Magnesium Alloy;Mechanical Properties;Texture;Anisotropy
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发布时间：2023-12-18 - 摘要：Al-6 Ti-1 C master alloys were prepared by the arc action using industrial pure aluminum,potassium fluorotitanate and graphite powders.The microstructure and phase composition of Al-6 Ti-1 C master alloys were observed and analyzed by OM,SEM,XRD,and EDS.Then it was utilized to refine industrial pure aluminum.The results reveal that current has an important influence on the microstructure of Al-6 Ti-1 C master alloys.With the change of current,the morphology and distribution of TiAl3 particles are also changed,which controls the effect of grain refinement.With the current of 70 A,the Al-6 Ti-1 C master alloy prepared by the arc presents the desirable refining effect on industrial pure aluminum.关键词：Current;Arc;Al-Ti-C Master Alloy;TiAl3;TiC
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发布时间：2023-12-18 - 摘要：The effects of pressure on microstructures of AZ91 D magnesium alloys were investigated through X-ray diffraction（XRD）,optical microscope（OM）,field emission scanning electron microscope（FESEM）and transmission electron microscope（TEM）.The results show that,AZ91 D magnesium alloys still consist ofα-Mg andβ-Mg17 Al12 phase after high pressure aging treatment.However,high pressure aging treatment can transform the morphology and distribution ofβ-Mg17 Al12 phase.Moreover,high pressure aging treatment can refine grain size significantly.关键词：Magnesium Alloys;Microstructures;High Pressure;Aging Treatment
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发布时间：2023-12-18 - 摘要：Based first principle,the lattice constants,formation energy and demixing energy of Cu-Ni-Sn solid solution with different components were calculated.The results reveal that the Ni content has a great influence on the spinodal decomposition of Sn.When the Ni content is less than 20%,the demixing energy of Sn is increased with the increase of Ni content,and Cu-Ni-Sn solid solution with 20%Ni presents the strongest trend of spinodal decomposition.When the Ni content is more than 20%,the demixing energy of Sn is reduced sharply,and the solid solution with different Sn content can be formed stably and absence of spinodal decomposition occurrs.The spinodal decomposition trend of Ni is much stronger than that of Sn and little influenced by Sn content.The volume strain of the solid solution is decreased during the spinodal decomposition of Sn,while the volume of solid solution is increased during the spinodal decomposition of Ni.关键词：Cu-Ni-Sn Alloy;First Principle;Spinodal Decompostion
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发布时间：2023-12-18 - 摘要：The structure and process design of the ZL205 Aframe casting were described,and the filling field,temperature distribution field,thermal stress and strain field during the solidification process were simulated by the FDM and FEM method.The gravity filling process of ZL205 Aframe casting was determined by the optimization of the T5 heat treatment process parameters and the location as well as size of reserved hole.The results show that the solidification sequence from inside to outside can be realized in the solidification process,and the peak value of thermal stress is 47.17 MPa.In addition,the average tensile strength,yield strength and elongation of the samples reach 510 MPa,402 MPa and 6.8%,respectively,after the T5 heat treatment,which meets the GB/T 9438-1999 technical requirements.关键词：ZL205A Alloy;Structural Design;Simulation Calculation;Solidification Process;Mechanical Properties
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发布时间：2023-12-18 - 摘要：A new meshless method SPH（Smooth Particle Hydrodynamics,SPH）was introduced.The SPH method can discretize the problem domain into a series of particles to avoid the decrease in calculation accuracy due to the division of the mesh.A mathematical model and SPH program were adopted to simulate and analyze the crack initiation and propagation of AZ31 magnesium alloy during ECAP process at high extrusion speeds.The simulated results were compared with the finite element simulation and experimental ones to verify the validity and feasibility of the SPH program.关键词：Smooth Particle Hydrodynamics（SPH）;AZ31 Magnesium Alloy;ECAP;High Extrusion Speeds
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发布时间：2023-12-18 - 摘要：The oxide film was abstracted into massless particles and Lagrangian equation was used to predict the motion of the oxide film segment.The volume equivalent of oxide film was used to characterize the degree of oxide film inclusions,and the empirical formula for the increase of oxide film thickness was proposed based on Campbell’s empirical data.Based on the above algorithm,a numerical simulation method was developed to predict the location and size of oxide film inclusions on InteCAST software platform.The calculation results were compared with the experimental ones to verify the practicability of the algorithm.关键词：Aluminum Alloy;Oxidation Inclusion;Numerical Simulation;InteCAST;Filling Process
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发布时间：2023-12-18 - 摘要：5A06 aluminum alloy and TC4titanium alloy were connected by squeeze casting and semi-solid forging,respectively.The shearing strength and the interface phase of the joint were investigated,and the optimal scheme was obtained by orthogonal experiment.The results show that the optimized process parameters of squeeze casting are presented as follows:poured at 850℃,the applied specific pressure on metal of 300 MPa for 45s,where the average shearing strength of the formed joints reaches 34.55MPa.When the liquid metal is poured at 800℃,the TiAl3 phase can be observed in connection interface,while poured at 850℃,the formation of Ti3Al leads to the decrease of shearing strength.The optimized process parameters for semi-solid thixotropic forging are presented as follows:the heating temperature of the billet at 625℃for 60min,the applied specific pressure on metal of 300MPa,where the average shearing strength of the formed joints reaches 57.02 MPa,and the joint interface can observe spherical Ti-based solid solution and a few Ti3Al and absence of Al3Ti,therefore,the shearing strength of the formed joint is improved.关键词：5A06 Aluminium Alloy;TC4 Titanium Alloy;Squeeze Casting;Semi-solid Forging
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发布时间：2023-12-18 - 摘要：<正>美国硅谷希拉（Sila）纳米技术公司近日宣布,已筹集7 000万美元将其新型硅锂电池技术从原型扩展到商业规模。该公司称,其拥有的技术可将锂离子电池的容量提高40%。锂离子电池是现代生活的主力军,为人们的智能手机和电动汽车提供动力。但是智能手机的电力一般使用不到一整天后就会耗尽;电动汽车则带给人们"里程焦虑",即使充满电,人们也无法像汽油动力车般放心出行。通过优化现有材料,老式锂离子电池已能实现每年5%左右的性能提升。提高电池容量的最直接方法是增加在任一电极中
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发布时间：2023-12-18 - 摘要：<正>日前,湖南黄金集团高性能稀土铝合金项目在衡阳市白沙洲工业园区正式投产。高性能稀土铝合金项目是湖南黄金集团以专利技术引进方式开展的主业项目,经两年多的筹划,通过层层测试,技术填补了国内新材料应用领域的空白。该项目已通过专家论证,获得湖南省国资委批准。2018年4月,湖南黄金集团与衡阳市白沙洲工业园区签订投资合作协议,2018年8月该项目经第3次股东会审议通过。高性能稀土铝合金材料是国家《新材料产业"十三五"
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发布时间：2023-12-18 - 摘要：<正>3D打印钛合金零件需要用到钛粉末,但这种重要原料长期依赖进口。据调查,南京工业大学研究团队已和南京经济技术开发区、中科煜晨激光技术有限公司合作成立新型研发机构"增材制造粉体材料研究院",第一台具有我国自主知识产权的钛合金粉末低成本生产设备,有望9月底开始安装调试。规模化生产后,钛粉末价格有望下降50%。研究院执行院长、南京工业大学材料科学与工程学院副院长常辉教授介绍,"增材制造"其实就是3D打印的学
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发布时间：2023-12-18 - 摘要：<正>2018年8月27日,中唐空铁集团与重庆大学国家镁合金材料工程技术研究中心合作组建"国家镁合金材料工程技术研究中心成果转化基地"揭牌仪式在成都中唐空铁产业园区举行。中唐空铁集团有限公司是我国新能源轨道交通科技创新型企业,主要从事中国新能源轨道交通,尤其是新能源空铁的研发、投资、建设与营运,是中国新能源空铁的开创和领军企业。
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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采用卷式法成功制备出厚度仅为0.014 mm的超轻镁锂合金箔卷材,这也是国内乃至世界上首次制备出这么薄的镁合金箔材。镁锂合金作为世界上最轻的金属结构材料,相比其他铝合金和镁合金,具有超低密度、高比强度、高比刚度,以及突出的减震性能和优异的电磁屏蔽性能等诸多独特的优势,是航空航天及武器装备上理想的减重材料,同时具备减震降噪,屏蔽电磁干扰等作用,使航天器、武器装备的机动性、准确性以及安全性和舒适性得到大幅度提高。
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发布时间：2023-12-18 - 摘要：Based on the analysis of die casting process and combined with the adopted die casting equipment,the die casting die for the faucet valve body was designed by UG software.In view of the complex internal structure of die casting product,the slant pillar guided side-core pulling mechanism,motordriven thread demoulding mechanism and gear-rack driven arched-core pulling mechanism were designed for the die.The die design can provide a reference for the design of arc core pulling mechanism and the lateral automatic threaded core demoulding mechanism.关键词：Die Casting Die;Faucet Valve Body;Arched Core Pulling;Automatic Thread Demoulding
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发布时间：2023-12-18 - 摘要：Aiming at the manufacture in inner stator iron core for AC fan,the problems in the lamination process were analyzed.During the die casting process,on the basis of optimizing design of inner stator iron core support sleeve,the convenient die-casting mould was adopted.The problems were solved such as mounting and locating of stator sheets,forming and removing gate of support sleeve part,ejection and remolding of castings.关键词：Lamination Die;Die-casting Die;Aluminum Alloy;Claw Gate
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发布时间：2023-12-18 - 摘要：Based on ensuring the quality of the products,the pressure and injection speed was decreased,so the die casting machine was selected from 12 000 kN to 8 000 kN,realizing the target of low cost.Through adopting the high vacuum technology,the vacuum valve and vacuum machine,the back pressure during the filling process was decreased effectively.The origination of defect was analyzed after changing the die casting machine tonnage by means of numerical simulation.By optimizing the gating and overflow system,the air pressure was reduced,meeting the requirement of customer.关键词：Die Casting;Aluminum Alloy;Cost;Reduce Tonnage
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发布时间：2023-12-18 - 摘要：Aiming at defects in die castings,such as shrinkage porosities,shrinkage holes and shrinkage concave,the countermeasures were provided from the aspects of part structure,die casting die structure,die process and operation as well as forced feeding.关键词：Shrinkage Holes;Shrinkage Porosities;Die Casting Die;Die Casting Coating
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发布时间：2023-12-18 - 摘要：A series of experiments were carried out to measure the temperature and pressure histories in cavity of Al-7 Si-Mg direct squeeze castings with different applied solidification pressures of 0.1,50,75,and 100 MPa.The evolution of the measured temperatures and pressures was discussed comparatively.The effect of pressure change on formation of shrinkage defects was analyzed.Further more,the friction force between the castings and dies during solidification process was calculated.It is shown that the applied squeeze pressure has significant influence on the frictional force at die and casting interfaces,which affects the pressure evolution and transmission.关键词：Squeeze Casting;Temperature;Pressure;Frictional Force;Aluminum Alloy
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发布时间：2023-12-18 - 摘要：In the process of industrialization,information technology has become an important means for casting companies to improve their level in production management and core competitiveness.For aviation titanium alloy castings manufacturing enterprises,a management method of integrated process was put forward in outsourcing based on informatization which consists of six links:plans of outsourcing,the establishments of the univalent bank of outsourcing,the commissions of outsourcing,the acceptances of outsourcing,the settlements of outsourcing and the reports of the cost of outsourcing.Based on the company’s titanium alloy precision casting digital manufacturing platform,it has also constructed a corresponding system management program and process,and the application effect shows that the overall level of outsourcing management and outsourcing benefits have been improved greatly.关键词：Aviation;Titanium Alloy Castings;Outsourcing Management;Information Technology
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发布时间：2023-12-18 - 摘要：The exposure curve for the experimental study on inspection of gas turbine blade by computed radiography was drawn to analyze crack in the blade.The results show that the cracks deeper than 0.6 mm and longer than 2 mm on the trailing and leading edge of gas turbine blades can be inspected effectively by using computed radiography.The visual effect of the cracks can be improved obviously by image processing technologies,so as to identify the cracks more clearly.关键词：Gas Turbine;Blades;Computed Radiography;Cracks;Image Processing
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发布时间：2023-12-18 - 摘要：The process of using selective laser sintering（SLS）technology to burn the water jacket of a heavy engine cylinder was analyzed.Heavy engine cylinder head water jacket has a complex cavity shape,large size and high pouring temperature.By choosing 70140 mesh ceramsites and the appropriate ratio of phenolic resin coated sand,with the appropriate laser sintering process parameters and the curing temperature as well as time,the large qualified cylinder head casting was produced sucessfully.关键词：SLS;Coated Sands;Water Jacket Sand Core
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发布时间：2023-12-18 - 摘要：The thin-walled structure part for aerospace were manufactured based on 3 Dprinting sand core by differential pressure casting technology.The results show that the sand core manufactured by 3 DP technology has high precision,uniform sand mold strength and good deformability.The internal quality of the thin-walled structure casting part with the high dimension precision of the shape structure using3 DP technology meets the design requirements.关键词：3Dp Technology;Sand Core;Thin-walled Structure Part
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发布时间：2023-12-18 - 摘要：Carboxylation was used to enhance the dispersion of CNTs.The 02.0% CNTs were added to Al matrix by powder metallurgy method.The mechanical properties of as-sintered and as-hot extruded CNTs/Al composites were tested at room temperature.The results show that the mechanical properties of CNTs/Al composites are increased with increasing in CNTs content.The tensile strength of CNTs/Al composites with 1.0% CNTs reaches 158 MPa,which is 40% higher than that of pure Al（113 MPa）prepared by the same conditions.For CNT content less than 1.0%,the hardness,yield strength and tensile strength of CNTs/Al are all proportional to the square roots of the CNTs contents,indicating that the main strengthening mechanism is characteried by the CNTs dispersion strengthening.关键词：Powder Metallurgy;CNTs/Al Matrix Composites;Carboxylation;Mechanical Properties
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发布时间：2023-12-18 - 摘要：Al/ZK60/Al composite plates were prepared by accumulative roll bonding.The effects of deformation passes on the microstructure and properties of ZK60/Al composite sheets were investigated by SEM,TEM,universal tensile testing machine and dynamic mechanical analyzer（DMA）.The results show that the interface of the composite plates with different deformation passes is well-bonded and there is no obvious necking or fracture.The tensile strength of ZK60/Al composite plate is increased firstly and then decreased.After ARB1 pass,the tensile strength of the composite plate is 216 MPa,and the elongation reaches 2.6%.The temperature-damping spectra of ZK60/Al multilayer composite sheet has two obvious internal friction peaks,namely,P1 relaxation type damping peak at about 150 ℃ and P2 recrystallization damping peak at about 300℃.The strain-damping spectrum of ZK60/Al multilayer composite sheet presents a typical dislocation damping mechanism,and the strain damping can be analyzed by G-L theory.关键词：ARB;Microstructure;Damping Peak;G-L Theory
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发布时间：2023-12-18 - 摘要：In-situ 5TiB2/Al-7Si composites were fabricated by mixed salt reaction in Al-7Si melt.The effects of TiB2and Mg contents on the impact properties of TiB2/Al-7Si composites were investigated.As the addition of TiB2and Mg element,theα-Al and eutectic Si phases in the composites can be refined,however its impact properties can be weakened.The Al-7Si alloy exhibits the satisfied impact toughness among these composites,and it is about of 14.2J/cm2.With the addition of 5%TiB2,the impact toughness of the composites is further reduced to 12.6J/cm2.When the 1.5%or 3%Mg element were added into the 5TiB2/Al-7Si composites,the impact toughness of the composites is reduced to 10.9and 10.4J/cm2,respectively.The fracture morphology of 5TiB2/Al-7Si composites is mainly characterized by dimple and quasi-cleavage of a mixed fracture.关键词：TiB2/Al-7Si Composites;Mg Content;Impact Properties
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发布时间：2023-12-18 - 摘要：The diamond/Cu composites were fabricated by spark plasma sintering（SPS）.The effects of diamond particles on the relative density,thermal conductivity,tensile strength and elongation of the composites were analyzed.The results show that with the increase of diamond content,the relative density,thermal conductivity,tensile strength and elongation of the diamond/copper composites are increased firstly and then decreased.With the diamond content of 1.0%,the tensile strength of the composite can reach the maximum value of 221.35 MPa.The maximum density can be obtained with the diamond content of 1.5%,and the thermal conductivity and elongation reach the maximum value when the diamond content is 2.0%.The fractures of diamond/copper matrix composites are characterized by ductile fracture and interfacial debonding.关键词：Diamond/Cu Composites;Spark Plasma Sintering;Relative Density;Thermal Conductivity
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发布时间：2023-12-18 - 摘要：A comprehensive temperature field finite element model was established for horizontal continuous casting（HCC）process of the metallic glasses of Zr48Cu36Al8Ag8to analyze the impacts of technological parameters during the process,based on the self-developed HCC slab blank caster.The results reveal that both design of the HCC and cooling rate achieved by the developed apparatus can well meet the critical conditions for formation of metallic glasses of Zr48Cu36Al8Ag8.The results reveal influence of technological parameters to instantaneous cooling rate and solidification front position,that is,casting speed>casting temperature>casting start position to solidification front and casting speed>casting start position>casting temperature to balance state of solidification front and slab length at which instantaneous cooling rate reach the critical value.Accordingly,the optimal process parameters are presented as follows:casting temperature and casting speed of 1 080℃and 4 mm/s,respectively,and the casting start position is suggested 14mm away from the entrance of crystallizer.关键词：Metallic Glasses;Horizontal Continuous Casting;Numerical Simulation
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发布时间：2023-12-18 - 摘要：Microstructure and magnetic properties of Fe64 Ni1 Al4.5 Cu0.5 Ga2 P9.65 B9.6 Si3 C5.75 amorphous alloy after magnetic pulse treatment and crystallization annealing were investigated by XRD and VSM.The XRD results show that after magnetic pulse treatment,the type and crystal volume fraction of precipitates in the alloy after crystallization are increased with decreasing in the grain size,and grain refinement occurs.The VSM results reveal that the Msof the alloy is increased,however,the residual magnetization Mr,the remanence ratio Mr/Msand the coercive force Hcare decreased,so the soft magnetic properties of the alloy are improved.关键词：Amorphous Alloy;Magnetic Pulse Treatment;Magnetic Properties;Precipitates;Crystallization Volume Fraction
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发布时间：2023-12-18 - 摘要：The Al-3 Nb-3 B master alloy was fabricated by an in-situ reaction from Al melt and Nb +KBF4 powders.The microstructure of Al-3 Nb-3 B master alloy and its grain refining effect on pure Mg were investigated.Experimental results show that the NbB2 with average particle size of 0.3μm and AlB2 with average particle size of 2μm can be observed in Al-3 Nb-3 Bmaster alloy.Both NbB2 and AlB2 particles can be acted as the nuclei site effectively,resulting in the grains refinement in pure Mg.With increasing in Al-3 Nb-3 B master alloy addition,the grain size of pure Mg can be further decreased.With0.3% Al-3 Nb-3 B master alloy addition,the average grain size of pure Mg reaches 280μm,decreased by91.5% compared with those of the unrefined pure Mg.关键词：Pure Mg;Al-3Nb-3B Master Alloy;Grain Refinement;Refinement Mechanism
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发布时间：2023-12-18 - 摘要：Stress-strain curves and microstructure evolution of 2D70aluminum alloy were analyzed by isothermal constant strain rate compression deformation test at 350530℃and strain rate of 0.0011s-1.The flow stress equation and dislocation density model of 2D70aluminum alloy were established under the given conditions.And DEFORM-3Dfinite element software was used to simulate the microstructure of the alloy.The results show that the dynamic recrystallization of 2D70aluminum alloy at 350℃can result in the more refinement of alloy grains under a lower strain rate(0.001s-1).The S-Al2CuMg phase is decreased greatly to be dissolved into the matrix and theα-Al phase grains is decreased gradually with increasing in strain rate when the deformation temperature reaches 470℃.The size ofα-Al phase is decreased with increasing in strain rate.Theα-Al phase grains are coarsened with deformed at a lower strain rate(0.001s-1).Simulation comparison reveals that the grains in the simulated microstructure are well in agreement with the evolution of metallographic microstructure.关键词：2D70 Aluminum Alloy;Flow Stress;Microstructure;Dynamic Recrystallization;Dislocation Density
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发布时间：2023-12-18 - 摘要：Influence of two kinds of swirling rotor on bubble in aluminum alloy was analyzed by water simulation.A compound degassing process was explored by using gas permeable brick,rotary degassing and compounded degassing process.The results show that the shape of the rotor has a great influence on the effect of degassing effects of aluminum liquid.The double rotor can crush the bubbles fully and disperse the bubbles even more,thus achieving the satisfied degassing effect.The degassing effect of spinning spray on the bottom aluminum fluid is poor,while the degassing efficiency of the permeable brick is low.The compound degassing with gas permeable brick and rotary degassing can treat the aluminum liquid in the bottom of container and improve the degassing efficiency markedly as well as increasing the density of aluminum liquid.关键词：Rotary Degassing;Gas Permeable Brick;Degassing
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发布时间：2023-12-18 - 摘要：The effects of Si,Mg,Ti elements content on the electrical conductivity of Al-Si-Mg alloy were investigated.The results indicate that with the content of Si increased from 6.0% to 7.5%,the conductivity is decreased from 20.8 MS/m to 19.2 MS/m.When the content of Mg is increased from0.16% to 0.45%,the electric conductivity of the alloy is decreased from 19.3 MS/m to 18.8 MS/m.When the grain refinement element Ti is changed between 00.12%,the electric conductivity of the alloy is decreased from 20.5 MS/m to 19.2 MS/m.The experimental research on the heat treatment parameters show that the electrical conductivity and hardness are decreased with the increase of aging temperature and aging time.At 220 ℃for 6 h,the conductivity reaches 23.6 MS/m and the hardness is 76 HB,meeting the requirements of conductors for the alloy properties.关键词：Al-Si-Mg Alloys;Compositions;Heat Treatment;Electrical Conductivity
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发布时间：2023-12-18 - 摘要：The isothermal compression tests of Ti-10.2 Mo-4.9 Zr-5.5 Sn alloy were tested to understand the hot deformation behavior in range of 670820 ℃ and strain rate range of 0.00110 s-1 on a Gleeble-3500 thermo mechanical simulator,and hot deformation activation energy was calculated.The results show that the flow stress is more sensitive to deformation temperature and strain rate,and the flow stress is decreased with the increase of deformation temperature and decrease of strain rate.The deformation activation energy of the alloy is the higher than the self diffusion activation energy of pureαtitanium and pureβtitanium alloy.The constitutive equation of Ti-10.2 Mo-4.9 Zr-5.5 Sn alloy is built up based on multiple linear regression method,where the correlation coefficient and the average relative error are 0.987 5 and 4.99% after an error calculation,showing a high precision.关键词：Ti-10.2Mo-4.9Zr-5.5Sn Alloy;Hot Deformation;Activation Energy;Constitutive Equation
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发布时间：2023-12-18 - 摘要：The same tin bronze blank was separately subjected to strong spinning and thinning and deep drawing based on the Simufact finite element simulation software.The equivalent plastic strain and equivalent stress of the connecting rod were taken as performance evaluation index to understand the effects of the two forming processes on the performance of the connecting rod bushing.The simulated results reveal that three-wheel wheel offset distance strong spinning for tin bronze joint bushing has the higher strength,while three successive thinning drawing link bushings presents the better plasticity.Finally,the tensile test has verified the feasibility of the simulation results.关键词：Connecting Rod Bush;Strong Spinning;Thinning Deep Drawing;Stress and Strain
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发布时间：2023-12-18 - 摘要：Al-Cu-Zr bulk metallic glasses（BMGs）were prepared by vacuum arc melting and copper mold casting.The glass-forming ability（GFA）and compression as well as impact strength of Cu54.5-xZr45.5 Alx（x =3,5,7）BMGs were analyzed.The results reveal that,with the increase of Al content in Cu54.5-xZr45.5 Alx,the thermal stability of BMGs is increased firstly and then decreased,and the amorphous formation ability with 5% Al content exhibits desirable.The increase of Al content in Cu54.5-xZr45.5 Alxis beneficial to enhancing material compression and impact fracture stress,and alloy with 7%Al has the maximum fracture stress.The effects of microalloying on strength of the alloy with7%Al can be ignored.Both the compression and impact fracture process of the alloy include two stages of elastic deformation and fracture.The local melting phenomenon occurs at the fracture surface during the impact process,finally the metal fiber and molten droplet morphology can be formed,while the materials only soften at the fracture during the compression process.Due to the larger impact strain rate,the elastic deformation energy accumulated in the specimen is the larger,which makes the fracture stress of the impact specimen generally higher than that of the compressed ones.关键词：Metallic Glasses;Compressive Strength;Impact Strength;Microalloyed;Local Melting
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发布时间：2023-12-18
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