最新刊期
卷 37 ， 期 5 ， 2017
- 摘要：The microstructures and properties of squeeze casting hypereutectic Al-17.5Si alloy after hot extrusion were analyzed.The results show that there are some effects of squeeze casting parameters on the microstructure of hypereutectic Al-17.5Si alloy,and the eutectic structure is refined significantly,and coralline eutectic Si phase is transformed into small needle-like ones.With the squeeze casting pressure increase,the coarse primary Si phases are reduced significantly and theα-Al dendrites are generated with more developed shape.After hot extrusion,microstructures of the squeeze casting hypereutectic Al-17.5Si alloy is changed greatly,and the absence of developedα-Al dendrite can be observed,and the small needle-like eutectic Si phases are broken into particles,and then are dispersed uniformly in the matrix of alloy after severe deformation.After hot extrusion forming,the properties of the squeeze casting hypereutectic Al-17.5Si alloy are improved greatly,especially the plasticity.After the hot extrusion forming of the squeeze casting billets at 320 MPa,tensile strength and elongation of the alloy reach158.82 MPa and 11.65%,respectively,which are increased by 84.13% and 441.86%,compared with those of the casting alloy.关键词：Hypereutectic Al-Si Alloys;Hot Extrusion;Squeeze Casting;Primary Si Phase;Mechanical Properties
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发布时间：2023-12-18 - 摘要：The surface microstructure of 30SiMn2 MoVA steel was observed by using the high current pulsed electron beam with different pulse treatment.The results reveal that some erosion pit with different shapes,sizes and uneven distribution can be observed on the surface of samples after irradiation by the HCPEB treatment.The erosion pits are decreased firstly and then increased with the increase of irradiation of pulses treatment.The erosion pits reach maximum value and the homogeneous remelting layer with 8μm in thickness is generated at 30 pulse treatment.The accicular martensite and retained austeniteare are generated on the surface microstructure of the samples.关键词：30SiMn2MoVA Steel;High Current Pulsed Electron Beam;Surface Modification
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发布时间：2023-12-18 - 摘要：Effects of slit runner width on microstructure and mechanical properties of the A357 aluminums alloy castings were investigated by designing different width of the runner,FEM simulation analysis and tensile testing.The results indicate that the solid phase is solidified nearby the heat exchange interface,and gradually transferred to the core area due to effect of interface heat transfer.Segregated shrinkage metallurgical defects can be observed as a result of the feeding distance of slit runner when the ratio of slit runner width with casting wall-thickness is low,however,in turn,lots of oxide inclusions and shrinkage porosities can be generated under influence of critical pressure of the cross section and extraction at the end of the solidification process.The peak value of tensile strength,yield strength and elongation can be presented when the proportionality coefficient between slit runner width and thickness size of casting is set to 1.2,where their reach 342 MPa,310MPa and 9.4%,respectively,and the fracture morphology is characterized by dimple fracture mechanism.关键词：A357 Aluminum Alloy;Microstructure;Slit Runner;Temperature Gradient
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发布时间：2023-12-18 - 摘要：Effects of Sm partial substituted Ce,La on microstructures and properties of the A（Ce,La）44 magnesium alloy were investigated by scanning electron microscopy,energy dispersive spectroscopy,surface scanning,differential thermal analysis and tensile testing.The results show that the eutectic phase of AE44 alloy is also mainly distributed at grain boundaries after Sm partly substituted Ce,La,and new high-temperature phase Al2 Sm and Al11Sm3 are generated.Meanwhile,absence of low melting point Mg17Al12 phase in A（Ce,La,Sm）44 alloy and A（Ce,La）44 alloy can be observed.The castability and solid-liquid phase temperature rang of A（Ce,La,Sm）44 alloy is similar to that of A（Ce,La）44 alloy.The ambient and high temperature strength of A（Ce,La,Sm）44 alloy is similar to that of A（Ce,La）44 alloy,where the tensile strength,yield strength and elongation of alloys reach more than 100 MPa,90 MPa and 30% at 200 ℃,respectively.关键词：A（Ce,La）44 Alloy;A（Ce,La,Sm）44 Alloy;Microstructure;Solid-Liquid Phase Range;Tensile Properties
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发布时间：2023-12-18 - 摘要：The microstructure and tensile strength at 1 100 ℃ of high W cast superalloy with W content of 12.0%,13.0%,15.5% and 16.5%（mass fraction）were investigated.The results show that with the increase of W content,the secondaryγ′phase is grown up into irregular shapes from regular square shape,and volume fraction is increased from 51.1%to 61.8%firstly and then decreased to 55.3%.The high temperature strength at 1 100℃of the superalloy is increased from 405 MPa to 488 MPa firstly and then decreased to 433 MPa.The alloy with low W content exhibits low tensile strength,which is mainly attributed to insufficient reinforcement of secondaryγ′phase,while for high W content superalloy,decrease of strength is attributed to the precipitation ofα（W）induced insufficient reinforcement of secondaryγ′phase.The tensile strength of alloys with W content of 13.0% and 15.5% has a higher strength,which reach 440488 MPa at 1 100 ℃.关键词：Superalloy;High Tungsten Content;High Temperature Tensile Strength
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发布时间：2023-12-18 - 摘要：Thermal-mechanical coupling numerical simulation was performed for rolling AZ31 magnesium alloy tubes based on finite element method to analyze influence of varied reduction on the temperature field.The availability of the model was verified by analysis of metal flow change.The results show that with the increase of reduction,temperature on the top of roller is increased monotonously,while temperature of roller gap is decreased monotonously,so temperature difference of roller top and roller gap is increased with the increase of reduction,and metal flow performance also can be increased accordingly.The simulated results were verified by the experimentones.关键词：Magnesium Alloy Tubes;Rolling;Finite Element Method;Temperature Field Distribution
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发布时间：2023-12-18 - 摘要：The liquid pressure forming process of Q235 Bring blank was simulated by the ProCAST software.The change of temperature field during solidification process of the ring blank was analyzed.The solid phase volume at different time in the solidification process was obtained,and influence of process parameters on the solidification process was analyzed.The results reveal that during solidification process,there exists temperature difference at varied location,and temperature in the contacting zone of liquid steel with mould is decreased rapidly.In addition,the last solidification zone is located at the middle of ring blank.With increasing in pouring temperature and mould temperature,the solidified time is postponed.关键词：Ring Blank;Pressure Forming;Temperature Field;Numerical Simulation
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发布时间：2023-12-18 - 摘要：<正>俄罗斯科学院物理学学院与西伯利亚联邦大学科学家合作,研发出一种制造氢燃料电池的粉末材料。为贮存和运送足够汽车行驶的氢气量,科学家们通常在高压下以压缩、液化、瓶装和罐装形式贮存氢气,以化合物的形式贮存氢气的新技术也相继问世。氢化物由某些金
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发布时间：2023-12-18 - 摘要：<正>欧洲汽车零部件生产商eskáZbrojovka如今深刻体会到现代熔炉技术带来的巨大收获。通过与史杰克西合作,该公司成功完成了铸造生产线现代化改造项目。改造完成后,这台1998年的史杰克西StrikoMelter竖式熔炼炉可实现与最先进设备相媲美的性能表现,能源消耗下降了20%,熔炉性能提高40%,各项指标均超出公司此前预期。
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发布时间：2023-12-18 - 摘要：A remote monitoring system for a die-casting workshop with 15 machines was developed.A monitoring communication program combined with the relevant mobile internet technology was presented,and a monitoring platform to achieve the mobile phone and computer monitoring network communications were built up.Androids client was developed based on Java programming for the Android system of mobile devices developed a monitoring APP.The current monitoring system exhibits desirable,improving the production efficiency of enterprises.关键词：Remote Monitoring;Mobile Internet;Network Communication;Monitoring APP
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发布时间：2023-12-18 - 摘要：The temperature field and stress field of castings and die-casting mould during process of lowpressure casting aluminum alloy hub were simulated by ProCAST software.According to the simulated results and the practical production,the mold structure and the die-casting process parameters were modified.The central composite experiment was used to design multiple experiments,and numerical simulation was carried out to analyze influence of variables on the filling process and mold.The response surface and the mapping relationship between the independent variable and the target were presented.The optimized model was established with the aim of light/low thermal stress/high efficiency.The multi-objective optimization was carried out using NSGA-Ⅱ algorithm and the Pareto optimal solution was obtained.Finally,the quality of castings and life of the mold were improved.关键词：ProCAST;Central Composite Experiment;Response Surface;Multi-objective Optimization
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发布时间：2023-12-18 - 摘要：According to the characteristics and requirements of all-electric five-point oblique toggle die casting machine,the mathematical models of toggle clamps were established.Cumulative function of normal distribution was used to construct the objective function.Expectations and the amount of fluctuation of the main performance parameters were determined,and the optimization constraint was set.Based on the method for solving constrained nonlinear optimization,the mold closing mechanism was optimized systematically.The results show that the force amplification ratio is enhanced greatly after optimization design,and the overall performance is more suitable for electric die casting machines.关键词：Electric;Clamping System;Toggle Clamp;Optimization Design
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发布时间：2023-12-18 - 摘要：Aiming at casting defects in die casting,such as shrinkage depression,porosity,flashes,shrinkage cavity and misrun,relationship of die casting machine and die casting mould as well as die casting process was analyzed.The relation of liquid metal pressure and flow volume was described by fluid mechanics（p-Q diagram）.By means of the software engineering philosophy,combining with the VB programming language,a module that could rapidly determine the solutions was developed.关键词：Casting Defects;p-Q Diagram;VB Platform;Ingate
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发布时间：2023-12-18 - 摘要：In the process of fabricating semi-solid slurry by strong cooling,thermal energy of the alloy melt transferring to the cooling water is controlled mainly by heat conduction,such as the materials and size of cooling pipe,the temperature and flow velocity of alloy melt as well as the flow rate and temperature of cooling water.The experimental results show that at the fixed other conditions,when the pouring temperature is increased from 620 ℃ to 630 ℃,the transfer thermal energy is increased by 1.03 times,and the flow rate of cooling water is increased from 3L/min to 4L/min,it is increased by 1.2times,while steel tube is substituted for copper tube,it is increased by 7times.关键词：Heat Transfer;Alloy Melt Temperature;Cooling Pipe Material;Flowing Rate
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发布时间：2023-12-18 - 摘要：Based on Pro/E software platform,a semi-solid magnesium alloy forging die intelligent design system with Chinese interface was developed in the Pro/TOOLKIT secondary development environment by using Visual C++6.0language development tools and dynamic link library（DLL）.The system can help the designer to achieve precision mold design intelligent,so as to improve efficiency of the mold design.The basic process of using Pro/E and intelligent die design system to design the die with complex cavity structure and core pulling mechanism was described for semi-solid forging die for magnesium alloy wheel hub.The results show that the system can improve efficiency of the complex mold cavity design.关键词：Pro/E;Forging Die Design;Wheels;Magnesium Alloys
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发布时间：2023-12-18 - 摘要：Wax pattern module for the directional vane was modified to balance the heat dissipation inner and outer sides of the vane,which can improve the inclined grain defect in the directional vane.Insulation device of ALD directional furnace was modified including decreasing the inner diameter and thickness of the insulation device.Through improving the insulation device,the grain in the directional vane is refined,and the temperature gradient of directional furnace is increased from 40.5 ℃/cm to 49.7 ℃/cm,so the grain structure and temperature gradient of directional furnace are optimized.关键词：Insulation Device;Directional Vane;Grain Structure
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发布时间：2023-12-18 - 摘要：A typical thin-walled complex bracket was produced with ZL114 Acasting alloy.Based on analysis of structure shape and casting difficulties of the bracket,composite investment shell mold and gypsum mold combined with low-pressure casting process was designed.The results reveal that by adding the enhanced rib and exhausted slot in thin-walled location of the bracket to optimizing parameters of low-pressure casting and T6 heat-treatment,misrun and shrinkage porosities in bracket can be elininated successfully,and the qualified bracket is produced successfully.关键词：Counter-gravity Casting;Low-pressure Casting;Thin-walled Casting;Aluminum Alloy
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发布时间：2023-12-18 - 摘要：Through analysis of the shape,structure and application environment of the bearing housings,the investment casting process of the bearing housings was designed and the solidification process was simulated by using the View Cast software.The results show that the shrinkage porosities and shrinkage holes occur at the top of the gating system.According to the simulated results combined with the theoretical analysis,the casting process was modified.Through improving riser to waist type feeding and ladder type gating system,casting sequential solidification was realized.The simulated results show that the optimized process can eliminate effectively the shrinkage cavity and shrinkage porosity defects.关键词：Bearing Housings;Numerical Simulation;Solidification Process;Casting Process
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发布时间：2023-12-18 - 摘要：Through selecting zircon sand as raw materials of sand,yttrium oxide（Y2O3）and phenolic resin as filler and binder,coated zircon sand was prepared by thermal method,and zirconium sand mold was prepared by selective laser sintering（SLS）to pour pure titanium castings by rapid prototyping process.The interfacial reaction between titanium alloy and mould was analyzed.The results show that the titanium castings with clear profile and clean surface and interface reaction layer only about 3μm can be fabricated successfully by SLS coated zircon sand casting with Y2O3 coating.Oxidation products in casting surface are composed of TinO2n-1 and TiO2.The thickness of O diffusion enrichment solution layer is about 1μm,which is TiO2.关键词：Selective Laser Sintering（SLS）;Coated Zirconium Sand;Y2O3;Interfacial Reaction
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发布时间：2023-12-18 - 摘要：TiC particle reinforced surface coating composites were prepared with grey cast iron as matrix and Ti-C-Fe powder system as surface pre-formed coating by vacuum EPC combined with SHS method.Effects of Fe content in Ti-C-Fe system on microstructure and properties of surface coating were investigated.The results show that the surface of Fe based coating is mainly composed of TiC phase and Fe phase.The in-situ TiC coating on the surface of substrate with nearly spherical shape has an uniform distribution and a desirable combination with substrate.The size of TiC particles is decreased with the increase of Fe content in the coating,while the hardness and wear resistance of the coating is decreased firstly and then increased,where the highest hardness can reach 59.8HRC.关键词：Vacuum Evaporative Pattern Casting;Self Propagating High Temperature Synthesis;TiC Particles;Surface Composites
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发布时间：2023-12-18 - 摘要：The Al-Mg bimetallic castings were prepared by lost foam casting（LFC）,and effects of pouring temperature on interface layers of the Al/Mg bimetallic castings processed by lost foam casting were investigated by optical microscopy（OM）,scanning electron microscopy（SEM）,energy-dispersive X-ray spectroscopy（EDS）and X-ray diffractometer（XRD）.The results show that thickness of the interface layer of the Al-Mg bimetal alloy is increased with the increase of the pouring temperature.With a pouring temperature of 730 ℃,a compact and uniform interface layer can be observed.When the pouring temperature is less than 730 ℃,there exist porosity defects in the interface layer of Al-Mg bimetallic castings,while the pouring temperature is more than 730 ℃,the thickness exhibits un-even interface layers of Al/Mg bimetallic castings.At different pouring temperatures,all the interface layers of Al/Mg bimetallic castings are composed of three different reaction layers:the Mg17Al12+δ-Mg eutectic closed to magnesium,the Mg17Al12+ Mg2 Si in the interface and the Al3Mg2+ Mg2Si nearby aluminum.关键词：Lost Foam Casting;Solid-Liquid Compound;Al-Mg Bimetal;Reaction Layers
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发布时间：2023-12-18 - 摘要：Porous diversion wall structure of a continuous casting tundish was optimized by the orthogonal experiment.Based on RTD curve calculation results and range analysis,the optimized fluid-control parameters were presented as follows:retaining wall center distances from the center of the tundish of1 550 mm,the diversion hole diameter of 100 mm and the diversion hole on the elevation of 35°,up and down hole distance of 240 mm.关键词：Tundish;Porous Diversion Wall;Optimization
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发布时间：2023-12-18 - 摘要：Effects of aging on corrosion behavior of a novel nano TiC/Ti refiner refined Al-Zn-Mg-Cu alloy were investigated by means of soaking corrosion,polarization curve and stress crack corrosion.The results indicate that after soaked in 3.5% NaCl solution for 192 h,the corrosion rate of peak-aged and over-aged Al-Zn-Mg-Cu alloy refined with TiC/Ti reach 0.756 5mm/a and 0.361 3mm/a respectively.The fracture time of stress crack corrosion are 72.2h and 50.1h with the peak-aged alloy refined with TiC/Ti at NaCl and NaCl+H2O2 solution,respectively,while at over-aged,they are 221.2h and 80.8h,respectively.The resistance of stress crack corrosion at over-aged is the higher than that of ones at peak-aged.The wider PFZ can decrease significantly the corrosion resistance of alloy refined with TiC/Ti at peak-aged,however,at over-aged,the coarse and discontinuous phase preciphated from grain boundary and the narrow PFZ can improve the corrosion resistance.关键词：Al-Zn-Mg-Cu Alloy;Nano TiC/Ti Refiner;Aging;Polarization Curve;Stress Crack Corrosion
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发布时间：2023-12-18 - 摘要：A ceramic/cast iron composites of ZTA/high chromium cast iron was fabricated successfully by pressureless infiltration with high chromium cast iron on the ZTA preform with 5%Ti particles.The microstructure,element composition and phase constituent of the composites were investigated by scanning electron microscopy（SEM）equipped with energy X-ray dispersive spectroscopy（EDS）system and Xray diffraction（XRD）.The results show that high chromium cast iron can be spontaneously infiltrated into the ZTA preform with 5%Ti particles and homogeneously distributed in the composites.Ti particles in the ZTA preform and Cr elements in the alloy promote jointly role for pressureless infiltration process.Moreover,the interfacial reactions occur between the alloy and the preform,and the reactive products are FeAl2O4 intermetallic and FeTiO5、AlCrO3 solid solution.关键词：ZTA Performs;High Chromium Cast Iron;Pressureless Infiltration;Ti Particles
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发布时间：2023-12-18 - 摘要：Effects of La addition on microstructure and mechanical properties of the ZM5 were investigated.The results show that the grain sizes ofα-Mg phase can be greatly refined by La addition,and the Al11La3,Al8LaMn4 phases are precipitated from ZM5 contained La alloys.With the increase of the La addition,net-likeβ-Mg17Al12 at grain boundary is distributed dispersedly into the alloy.The ZM5+0.8La alloy exhibits the desirable tensile properties,where the tensile strength and elongation reach 225 MPa and 5.32% at room temperature,respectively.关键词：ZM5 Magnesium Alloy;Lanthanum;As-cast Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：In order to solve the problem of poor mechanical properties,effects of Nd and Nd-Ti-B modification treatment on solidification structure and mechanical properties of Al-18Mg2Si alloy were investigated by OM,XRD and SEM.The results reveal that,for Al-18Mg2Si alloy after 0.25% Nd modification,the size of primary Mg2Si is decreased from 65μm to 26μm,and the number ofα-Al phase enclosing primary Mg2Si is increased.In addition,the lamellar space of eutectic Mg2Si is reduced from 35μm to 1μm with the decrease of size and increases of eutectic colony number,compared with those of ones without modification.After 0.25%Nd+0.1%Ti+0.02%B compound modification,the size of primary Mg2Si is reduced to 15μm with great increase of content.The tensile strength of Al-18Mg2Si alloy after0.25%Nd and 0.25%Nd+0.1%Ti+0.02%B modification is improved by 9.6%and 23.6%,and the elongation is increased by 33% and 75%,respectively.The effect of Nd-Ti-B compound modification is superior to that of single Nd modification.关键词：Al-18Mg2Si Alloy;Complound Modification;Primary Mg2Si;α-Al Phase
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发布时间：2023-12-18 -
Effects of Er、Zr and B on Microstructure and Properties of Heat-Resistance Conductive Aluminum Alloy
摘要：Influences of Er,B and Zr addition on micro-structure and heat-resistance of the aluminum alloy were investiagted.The results reveal that addition of Er can generate secondary phase Al3Er with Al to restrict migration of grain boundaries and grain growth and delay the recrystallization,which are responsible for improving the hear resistance of the alloy.B can transform the Zr from a solid solution state to a precipitation state in form of tiny and plate-like ZrB2 existing in grain and grain boundaries to decrease lattice distortion and improve the matrix ordering.Thus,the electric conductivity of the Al alloy is enhanced.关键词：Aluminum Alloy;Electric Condictivity;Er;Zr;B- 2
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发布时间：2023-12-18 - 摘要：The hot deformation behavior of TiAl alloy was analyzed on a Gleeble-3500 thermal mechanical simulator at various temperatures（1 2731 423K）and strain rates(0.0011s-1).Constitutive equation based on introducing the strain was established by using multiple linear regression for material constant and true strain relationship.The results reveal that the presented model with six order polynomial fitting can better predict the experimental data on the true stress-strain curve,and relative error is less than 5%.关键词：Ti-Al Alloy;Hot Deformation Behavior;Flow Stress;Constitutive Relationship
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发布时间：2023-12-18 - 摘要：Influence of the different Ce content on microstructure and mechanical properties of the AS31 alloy were investigated.The results show that the size,morphology and distribution of eutectic Mg2Si in the AS31 alloy are improved with Ce addition.With Ce addition,size of eutectic Mg2Si phase is decreased firstly and then increased.When Ce addition is 0.9%,morphology of Mg2Si phase in the alloy is transformed from coarse Chinese script structure into vermicular or particle ones with size of about 30μm,exhibiting the satisfied modification effect.In addition,with increasing in Ce addition,tensile strength and elongation of the alloy are increased firstly and then decreased.关键词：AS31 Alloy;Eutectic Mg2Si;Ce;Mechanical Properties
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发布时间：2023-12-18 - 摘要：According to thin-walled bracket structural characteristics and quality requirement,the design of sand casting process for the thin-walled aluminum alloy bracket was carried out.The View Cast software was used for the filling and solidification process.The simulated results show that a large number of shrinkage cavity and shrinkage defects appear in the solidification process as a result of the failure to completely fill the mold because of the thin wall thickness of the bracket.Origination of the defects was described,and the gating system was optimized.Through selecting the position of the riser and the cold iron,designing the size of the riser and the cold iron,the simulated results reveal that the optimized casting process can eliminate the casting defects and meet the requirement of the casting production.关键词：Aluminum Alloy Bracket;Numerical Simulation;Casting Defects;Process Optimization
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发布时间：2023-12-18 - 摘要：The effects of pre-streching prior to artificial aging on microstructure and tensile properties of the Al-4.5Cu-0.8Mg alloy were investigated through tensile testing,hardness testing,metallographic microscope and TEM with pre-streching of 0,2% and 8%.The results show that the aging hardening responsing exhibits obvious with the increase of plastic deformation after quenching,enhancing the peakaged tensile strength and shortening time of tending peak strength.Pre-streching before aging can refine significantly the precipitated phase,and with the increase of the degree of pre-streching,the precipitation strengthening phase is dispersed and refined,which is beneficial to hindering the dislocation movement and enhancing the strength of the alloy.关键词：Al-Cu-Mg Alloy;Pre-streching;Hardness;Tensile Test;Microstructure
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发布时间：2023-12-18 - 摘要：Titanium alloy of Ti-6Al-4V-2Cr contained different Mo was prepared by the cold isostatic pressing and vacuum sintering.Effects of varied Mo content on microstructure and mechanical properties of the alloy were investigated by OM,XRD and SEM,tensile testing.The results show that the relative density of the alloy with different Mo content reaches over 98%,and it is the most dense with the Mo content of 1.5%.The microstructure of the alloy is varied with different Mo content.When the Mo content is less than 1.5%,the morphology of the alloy consists of coarse equiaxed grains,and they will be refined gradually along with the increase of Mo content.However,when the Mo content is more than1.5%,the morphology shows basket-weave shape.The tensile strength,hardness and elongation of the alloy are increased firstly and then decreased with the increase of Mo content,where they reach 1 054.7MPa、332.7HV、6.1%,respectively,with 1.5% Mo addition.Titanium alloy mainly consists ofα-Ti andβ-Ti phase through the X-ray diffraction（XRD）,and the hard brittle TiCr2 phase can be observed in the microstructure of Ti-6Al-4V-2Cr alloy containing 3.0% Mo,which can reduce the mechanical properties of alloy.关键词：Density;Microstructure;Mechanical Properties;Precipitated Phase
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发布时间：2023-12-18 - 摘要：In order to understand effects of the hook tip radius and effective thickness on the fatigue life of the frictional stirring welded magnesium alloy lap joints,the finite element models at different effective thickness and hook tip radius were established.The tensile mechanical response of simulation testing was analyzed by the finite element software,and local stress and strain distribution of the lap joints were analyzed under varied external loads.In addition,fatigue life of lap joints was predicted by fatigue damage equation of SWT and MC.The results show that stress concentration is mainly located around the hook tip of the lap joint,and fatigue damage equation of SWT can predict more accurately fatigue life of the joints.With the increases of hook tip radius and effective thickness,the fatigue life is increased.关键词：Frictional Stirring Welding;Hook Tip;Fatigue Life;Lap Joints
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发布时间：2023-12-18 - 摘要：Effects of RE element Nd on microstructure and mechanical properties of AZ80 magnesium alloy were analyzed by OM（optical microscopy）,XRD（X-ray diffraction）and SEM（scanning electron microscopy）.The as-cast microstructure of AZ80 alloy consists ofα-Mg matrix andβ-Mg17Al12 phase which appears in form of coarse network at grain boundaries.With addition of Nd,coarse continuousβ-Mg17Al12 phase is refined and becomes discontinuous,and a new rod-shaped Al11Nd3 phase and blockshaped Al2 Nd phase occur in alloy.Under as-cast conditions,with the increase of Nd addition,the mechanical properties of AZ80 magnesium alloy is increased firstly and then decreased.With the Nd content of 0.9%,the tensile strength,yield strength and elongation of the magnesium alloy are increased to 205 MPa,135 MPa and 7.5%,respectively.During aging treatment,the addition of Nd can suppress the discontinuous precipitation of plate-likeβ-Mg17Al12 phase at grain boundaries,and the time of reaching the peak hardness is delayed.After T6 heat treatment,the tensile strength,yield strength and elongation of AZ80-0.6Nd alloy are increased to 221 MPa,164 MPa and 4.1%,respectively.关键词：AZ80 Alloy;Nd;Aging Treatment;Microstructure;Mechanical Properties
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发布时间：2023-12-18
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