最新刊期
卷 34 ， 期 4 ， 2014
- 摘要：The（AlCrMoNiTi）Nxand（AlCrMoZrTi）Nxhigh entropy alloy nitride films were fabricated successfully by radio frequency（RF）magnetron sputtering on the S304stainless steel and on Cu substrates,respectively.The frictional behavior of the film prepared was examined on a Micro-Tribotester. The experimental results show that the（AlCrMoZrTi）Nxfilms have the minimum friction coefficient of 0.182and 0.127on the S304stainless steel and on Cu substrates,respectively and the maximum wear life of 1200s.On both substrates,the frictional behavior of（AlCrMoZrTi）Nxfilms are superior to that of（AlCrMoNiTi）Nxfilms,which is attributed to solid-solution strengthening effect of Zr element superior to that of Ni.The frictional mechanism of the two kinds of films is characterized by abrasive wear on the substrates of S304stainless and on Cu.关键词：High Entropy Alloy;Nitride Film;Solid-Solution Strengthening;Abrasive Wear
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发布时间：2023-12-18 - 摘要：A kind of Ti cladding nano-sized TiN（TiN/Ti）composite grain refiner was prepared by high energy ball milling.Effects of the grain refiner prepared on the as-cast microstructure and properties of the 7050aluminum alloy were approached.The results show that TiN/Ti grain refiner is superior to pure Ti in refining grain of 7050aluminum alloy obviously,and the average grain size in the 7050aluminum alloy is refined from 105.5μm to 83.5μm,meanwhile,second phases is well refined with uniform distribution in the microstructure.Tensile strength and hardness of 7050aluminum alloy with TiN/Ti grain refiner are improved from 187.8MPa to 220.8MPa and from HB97.63to HB102.7,respectively.关键词：Nano TiN;7050 Aluminum Alloy;As-cast Microstructure;Grain Refinement;Tensile Strength
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发布时间：2023-12-18 - 摘要：Effects of Gd on microstructure and compressive creep behavior of Mg-7Al-1Si alloy were investigated by optical microscopy（OM）,scanning electron microscope（SEM）,X-ray diffraction analysis（XRD）and high temperature compressive creep apparatus.The results show that proper Gd addition can greatly refine the as-cast microstructure and improve the morphology of Mg2Si phase as well as making theβphase more dispersed distribution,so the elevated creep behavior of the alloy is improved.In addition,Al2Gd particulate appears in the matrix.The microstructure and composition of Mg-7Al-1Si alloys are more homogeneous with 1.0%Gd and desirable grain refinement and high creep resistance can be obtained,where the average grain size is decreased from 79.08μm to 39.12μm,and theβphase content are decreased from 10.88%to 6.98%,while the morphology of the Mg2Si phases is changes from coarse Chinese script shape to short rod or fine particle.Accordingly,the creep properties of the alloy are improved greatly.关键词：Mg-Al-Si Alloy;Rare Earth Gd;Microstructure;Creep Property
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发布时间：2023-12-18 - 摘要：Effects of alloy elements including C,Si,Mn,Cr,Ni,and Mo,on the casting properties of SA508III steel were investigated by the JMatPro calculation.Variance analysis and linear regression were used to evaluate the regression equations for two objective functions by 6factors,3levels with a total of 150groups,which was related to casting properties of steels.The results show that the orthogonal experiment is an effective way to optimize the composition of SA508III steel.It is demonstrated by calculation that the casting properties of SA508III steel can be improved by decreasing the content of C and Si,and the casting defects such as hot tears and shrinkage porosity can be reduced.关键词：SA508III Steel;Composition Optimization;Casting Properties;JMatPro
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发布时间：2023-12-18 - 摘要：Al-15Pb alloys were prepared with hexahedral anvil at high pressure solidification（4GPa）and high pressure heat treatment（4GPa）.Microstructure and wear-resistance of the alloy prepared at normal pressure and at high pressure were analyzed comparatively by SEM（scanning electron microscope）, EDX,XRD,Mcrohardness tester and friction-wear tester.The results reveal that Al-15Pb alloys consist ofα-Al phase and Pb phase with the morphology of the particle under normal pressure and high pressure,and a great amount of Pb particles are distributed in Al matrix under normal pressure,while Pb phase is decreased with size refinement under high pressure solidification conditions.Morevoer,the trace Pb phase with large size can be observed under high pressure heat treatment condition.The solid solubility of Pb inα-Al phase is zero under normal pressure,while Pb has a slight solution inα-Al phase under high pressure.Meanwhile,solid solution in high pressure solidification is a little greater than that in high pressure heat treatment.Compared with normal pressure,the density of Al-15Pb alloy solidified at 4GPa is increased,and change in high pressure heat treatment can be ignored.Furthermore,the microhardness of theα-Al phase in Al-15Pb alloy at 4GPa solidification is much greater than that in normal pressure,and the increment rate reach 39%.The microhardness of theα-Al phase in Al-15Pb alloy at 4GPa heat treatment is also increased,and the increment rate reaches 19%.The wear resistance of Al-15Pb alloy prepared under high pressure is improved,and antifriction properties exhibits poor.关键词：Al-15Pb Alloy;High Pressure Solidification;High Pressure Heat Treatment;Microstructure
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发布时间：2023-12-18 - 摘要：Isothermal hot deformation tests were performed on commercially available titanium（Grade 2） samples at high temperatures using a Gleeble 3500thermo-mechanical simulator.The flow stress curves and microstructures of the samples were investigated after hot deformation and quenching processes to evaluate dynamic recrystallization process,respectively.The results show that significant influence of deformation temperature and strain rate on deformation structure and flow curves can be observed during deformation.Meanwhile,dynamic softening behavior on the material can be observed during hot deformation tests.The degree of softening is related with temperature,strain rate and un-loading time. Compared with microstructure of pure Ti without deformation,the grain size under deformation is refined greatly.关键词：Titanium（Ti）;Dynamic Recrystallization;Deformation;Grain Refinement
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发布时间：2023-12-18 - 摘要：The microstructural evolution and mechanism of 6061bulk alloy prepared by cold pressing of alloy powder were investigated during partial remelting.Meanwhile,effects of heating temperature on semisolid microstructure of the 6061alloy prepared were analyzed.It is found that after partial remelting,semi-solid microstructure with small and nearly spherical particles can be obtained in the alloy prepared.The microstructural evolution can be divided into three stages:the rapid coarsening of grains, structural separation and spheroidization,the final coarsening behavior of primary particles.Furthermore,proper elevated heating temperature is beneficial to generating ideal semi-solid microstructure.关键词：6061Alloy;Bulk Alloy;Partial Remelting;Microstructure Evolution
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发布时间：2023-12-18 - 摘要：Progress in grain refining technology for 5154aluminum magnesium alloy wire rods in recent years was surveyed.From two aspects of alloys material composition design optimization and the grain refinement technology,some measures,such as modification treatment,electric field refinement and surface treatment,heat treatment process and optimization of drawing-pulling pass,were described.Optimized ways of alloy chemical composition,preparation technology and grain refinement process were summarized.The problems in the development of ultra-fine and super-strength tendency and the corresponding technical route were approached.关键词：Aluminum Magnesium Alloy Wire;Super-Strength and Ultra-Fine;Grain Refinement
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发布时间：2023-12-18 - 摘要：The stress distribution in the AZ80bar extrusion pipe was simulated by the DEFORM-3Dat different speeds（10mm/s、50mm/s、100mm/s）under four temperatures（150 ℃、200 ℃、250 ℃、300 ℃）,respectively.The results show that stress in the AZ80alloy pipe is increased with decreasing in temperature and increasing in the speed.The simulated result also reveal that magnesium alloy pipe can be formed with high speed（100mm/s）under low temperature（150℃）,and device stress is less than the design limits（400MPa）during the whole extruding process.At the same conditions,magnesium alloy tube was extruded successfully with self-made extrusion device.关键词：Magnesium Alloy;Static Liquid Extrusion;Numerical Simulation;Temperature;Extrusion Speed
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发布时间：2023-12-18 - 摘要：Cast-rollers are very important in the twin-roll casting process,which is used to realize the solidification and rolling process of the molten metal.Meanwhile,the heat transfer process and the temperature distribution of roll sleeves are important factors influencing thermal crowning of the rolls as well as the shape and profile of cast strip.The temperature field of roll sleeves in the top side-pouring twin roll caster was simulated by the Fluent software during the twin-roll strip casting.The results show that the simulated results are well agreement with the measured data.The temperature of outer surface of the caster roll exhibits a periodic change with the rotation of the caster roll in the twin-roll strip casting.When the thickness of both the upper sleeves and the lower sleeves are 40mm,the temperature distribution of the upper roll sleeve is very different from that of the lower roll,and the temperature of the lower roll sleeve is significantly higher than the upper roll sleeve.Effects of strengthening internal water cooling on the temperature field of the roll sleeve can be ignored.Through reducing the thickness of roll sleeve,the temperature of the roll sleeve is decreased,however,the temperature difference between the outer surface and inner surface of the roll sleeve is increased.Through increasing the contact arc of the molten pool and the upper roll,the temperature of the upper roll sleeve is raised.关键词：Top Side-Pouring Twin Roll Casting;Roll Sleeve;Numerical Simulation;Temperature Field
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发布时间：2023-12-18 - 摘要：Based on the finite differential method,the temperature field in the solidification process of ductile iron grinding ball in permanent mold was simulated by employing self-developed simulation software.The possible defect position in the grinding ball was forecasted.The origination of shrinkage holes in the grinding ball was analyzed.The gating system was modified to optimize design by adding sand sleeves,shortening ingates and reducing the sprue size as well as other methods.The temperature field of the gating system optimized was simulated.The simulated results show that the optimized gating system can realize the sequential solidification,and shrinkage holes are transferred from the ball to the sprue.The simulated results are consistent with the actual casting ones.关键词：Numerical Simulation;Solidification Process;Temperature Field;Feeding
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发布时间：2023-12-18 - 摘要：The method of capturing the solute diffusion layer’s boundary was proposed in the process of dendritic growth simulating by the phase-field method.It not necessary to calculate all grid of calculation area,and the computational time can be saved by the reduction of computation’s loop.The solute diffusion layer’s boundary is captured in the direction of two-dimensional grid xand y.The calculations are performed only in the grid within the boundary,therefore the calculation time of phase-field model is decreased greatly.The simulation results of dendrite morphology and the solute field in two-dimensional dendritic growth are agreement well with that before algorithm optimization.关键词：Phase-Field Model;Microstructure;Dendrite Growth;Solute Diffusion Layer’S Boundary
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发布时间：2023-12-18 - 摘要：Based on the working condition of the vertical twin-roll casting machine,the metal delivery system for magnesium alloy sheet with twin-roll casting process was designed,and flow field and temperature distribution in the system were simulated by the Anycasting software.Meanwhile,according to similar principles,an acrylic experimental model on the ratio of 1∶1was manufactured to conduct physical simulation.The results show that the system with multi-level and dams can not only reduce the impact of liquid magnesium alloy to molten bath but also obtain the uniform distribution along the rollers. The optimization height of dam is 10mm.In addition,the position of the dams was optimized.When the width of the system′s outlet is 1mm,the uniform temperature distribution in molten pool can be observed.关键词：Magnesium Alloy;Twin-Roll Casting;Metal Delivery System;Numerical Simulation;Anycast-ing Software
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发布时间：2023-12-18 - 摘要：The investment casting of common medical metal material such as stainless steels and cobaltbase alloys was briefly described,and the developing tendency of the investment casting titanium and titanium alloys in the perspective of pattern material,refractory material,binder,smelting technology was paid attention to.Then the present industry status of the investment casting medical metal material was analyzed in details.Finally,the countermeasures and prospects of the investment casting medical metal materials at home were presented.关键词：Medical Metal Material;Investment Casting;Prospect
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发布时间：2023-12-18 - 摘要：The K424superalloy adjustment sheet as one of the core components of the aero-engine which belongs to large size thin-walled structural parts was produced by investment casting.The porosity, crack can be easily observed in the adjust sheet during the investment process as a result of metallurgical quality.Origination of crack and shrinkage porosity was analyzed.By optimizing gating system,controlling pre-heating temperature of the mold and pouring temperature,crack and shrinkage porosity can be reduced greatly.adjust sheet with desirable quality was produced,obviously improving the yield production rate.关键词：Investment Casting;Thin-Walled Adjust Sheet;Gating System
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发布时间：2023-12-18 - 摘要：Cracks often occurred in steel component for aviation industry were analyzed,and processing modification was put forward.The liquid steel was modified with rare earth,and proper RE addition（0.06%0.13%）was determined to increase the qualified rate of the investment casting steel component.关键词：Casting Steel;Crack;Rare Earth Treatment
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发布时间：2023-12-18 - 摘要：The auto-steering control-arm was produced by squeeze casting and by casting-forging integrated forming,respectively,and effects of casting-forging forming and aging treatment on microstructure and properties of AZ91D magnesium alloy were analyzed.The results show that the microstructure of casting-forging auto steering control-arm is refined as a result of recystallization,and tensile strength, yield strength,hardness and elongation are superior to those in squeezing casting.After aging treatment,tensile strength,yield strength and hardness of the control arm are further increased,while elongation is slightly decreased.关键词：AZ91DAlloy;Squeeze Casting;Casting-forging Integrated Forming;Aging Treatment
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发布时间：2023-12-18 - 摘要：Numerical simulation of direct squeeze casting Al-Zn-Mg-Cu alloy with compound trace Sc、Zr addition was conducted with the help of the ProcCAST software to understand the formability of the alloy in a special design mold.The simulated results reveal that during filling process,different filling velocity can be observed at different thick location,where with increasing in thickness,the filling velocity is accelerated.The inclusion and entrapped-gas easily occurs in convergence of liquid metal as a result of un-stable filling.Through modifying design,the squeezing casting parts with inclusion-free and entrapment-gas free can be produced.关键词：Al-Zn-Mg-Cu Alloy;Squeezing Casting;Numerical Simulation
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发布时间：2023-12-18 - 摘要：Microstructure and tensile properties of specimens directly machined from the practical low pressure die casting AC4Aalloy engine cylinder heads with different heat treatments（T4/T6）were analyzed.After tensile testing,defects in the fracture surfaces were observed and analyzed by scanning electron microscope（SEM）attached with energy-dispersive X-ray spectroscopy（EDX）.In addition, Weibull statistical analysis method was applied to identify the scatter of tensile strength of the parts with different aging temperatures and time.The results indicate that the silicon particles in the parts after T4 heat treatment are characterized by long acicular shapes,and the specimens at both T4and T6status belong to brittle fracture mode.The T6-175℃×4h（artificially aged for 4hat 175℃）treated alloy has a maximum Weibull modulus（32.3729）for ultimate tensile strength（UTS）,which is obviously higher than those of the other specimens,meaning the minimum scatter of the data and desirable stablity,while the characteristic tensile strength of the T6-175 ℃×4htreated alloy is slightly below that of T6-155 ℃×10htreated alloy.关键词：AC4AAluminum Alloy;Heat Treatment;Tensile Strength;Weibull Distribution
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发布时间：2023-12-18 - 摘要：Thermostat as a key part of automobile engine requires very high air tightness.The HPDC process of automobile thermostat was simulated,and the vacuum die-casting process was adopted to reduce the gas porosity.In order to reduce shrinkage porosity,the solidification and feeding process were controlled by the compact pin.The defective rate of castings can be reduced from 8.07%to 0.90%finally.According to the manufacturing process of thermostat assembly,the subsequent machining,assembly,detection were described,and countermeasures were presented.关键词：Numerical Simulation;Vacuum Die-Casting;Compact Pin;Accurate Assembly
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发布时间：2023-12-18 - 摘要：Die casting experiments were conducted to understand influence of processing parameters on mechanical properties of AT72magnesium alloy by means of density measurement and mechanical properties testing.Processing parameters were investigated including conventional die casting,vacuum die casting,normal steel plunger,sealing copper plunger,slow shot speed,fast boost pressure,resident time in the die chamber and exhausting design of slow shot stage.The results show that the mechanical properties of AT72magnesinam can be further improved by selecting the appropriate slow shot speed, fast boost pressure,resident time in the die chamber and using the effective exhausting design of slow shot stage.Density and tensile strength of the samples have a corresponding relationship.The higher the density of the samples are,the higher the tensile strength is.关键词：Die Casting Process;AT72Alloy;Magnesium Alloy;Mechanical Properties
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发布时间：2023-12-18 - 摘要：The centrifugal casting process with graphite mould for a titanium impeller used for chemical equipment was described.Origination of gas holes and blade position offset in the Ti alloy impeller were analyzed.By increasing the machining allowance and the centrifugal rotational speed as well as optimizing graphite mould,such as the machining allowance increased from 5mm to 15mm,the centrifugal rotational speed increased from 120r/min to 200r/min and scribing tool,the defects in the Ti alloy impeller were eliminated,and the qualified titanium alloy impellers were produced sucessfully.关键词：Titanium Alloy;Impeller;Graphite Mould;Centrifugal Casting
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发布时间：2023-12-18 - 摘要：A multi-element aluminum-bronze alloy was prepared by adding some elements（Ni、Fe）into the Cu-Al based alloy in permanent mold casting.Effects of solid solution treatment on corrosion behavior of the Cu alloy prepared were investigated with the help of weight-loss tests,SEM（scanning electron microscope）,EDS（energy dispersedly spectrometer）and XRD（X-ray diffraction）.The results show that the dealuminzation corrosion is dominant in the 3.5% NaCl solution with corrosion rate of 0.029 5 g/（m2·h）and self-corrosion potential of-322mV,while the microstructure of the alloy prepared is composed mainly ofα、β’、γ2and k phases after solid solution treatment（950℃for 2hand aging at 550 ℃for 4h）,and its corrosion rate is 0.022 6g/（m2·h）with self-corrosion potential of-236mV,exhibiting a satisfied corrosion resistance.关键词：Novel High Aluminum Bronze;Solution and Aging;Corrosion Resistance
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发布时间：2023-12-18 - 摘要：Ni-based reinforced composite coating was prepared successfully on the surface of 16Mn steel with the pre-alloyed powder of Ti,C,TiN and Ni60Aby means of argon arc cladding technique.The microstructure and phase constituent were investigated using OM（optical microscope）、SEM（scanning electron microscopy）and XRD（X-ray diffraction）.The results show that the composite coating is composed of TiC、TiN,γ-Ni and M23C6particles.The microhardness can reach 900HV0.2,which is 3times higher than that of 16Mn steel.The relative wear resistance of coating is about 8times higher than that of 16Mn steel substrate.关键词：Argon Arc Cladding;Composite Coating;Micro-Hardness;Wear Resistance
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发布时间：2023-12-18 - 摘要：Double scale（nano,micro）Al2O3particle reinforced aluminum matrix composites were prepared by powder metallurgy combining with vacuum hot pressing sintering method,and the microstructure,density, hardness and wear resistance of the composites prepared were analyzed.The results show that two-scale composite reinforcement is uniformly distributed in the matrix with the absence of agglomeration.With micron particle content more than 20%,the holes in the composites prepared are increased.Two-scale composites with particles in size of 4%30nm and 15%75μm exhibit desirable performance,and its hardness is increased by 70%, and wear resistance is increased by 7.31%,compared with those of Al-Si matrix.Wear resistance of two-scale hybrid particulate composites is higher than a single nanometer or micrometer particulate reinforced composites, and the main wear mechanism is characterized by adhesive wear,plough wear and abrasive particle wear.关键词：Vacuum Hot Pressing Sintering;Dual-Scale Particle Reinforced;Aluminum Matrix Composites;Hardness;Wear Resistance
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发布时间：2023-12-18 - 摘要：SiC particles reinforced aluminum matrix composites with different SiC volume fractions were prepared by powder metallurgy.Effects of different SiC volume fraction on microstructure and properties of the aluminum matrix composites were investigated.The results indicate that increase of SiC content can deteriorate the mold service life during pressing process,while it can promote densification during sintering.With the increase of SiC content,hardness of the composites prepared by sintering is decreased.The wear behavior of the composites prepared is firstly decreased and then increased with increasing in SiC content,and the desirable wear resistance can be obtained with 15%30%SiC content.The wear mechanism is characterized by abrasive and peel wear.关键词：SiC Particles;Aluminum Matrix Composites;Microstructure;Wear Properties
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发布时间：2023-12-18 - 摘要：Effects of 30% SiC particle with various sizes on microstructure and properties of aluminum matrix composites which were prepared by vacuum hot pressing sintering were investigated.The results indicate that with increasing particulate size from 3.5μm to 40μm,tensile strength and hardness of the composite are decreased,while elongation and section shrinkage rate are increased,meanwhile,reinforcing particles are more uniformly distributed in the matrix.The maximum relative density of the composites prepared can be observed with SiC particles size in 25μm.The fracture mechanism of the composites prepared is characterized by SiC particle crack,tearing of matrix near interface and matrix crack. With increasing in particulate size,the failure mode of the composites is transformed from tearing of matrix near interface and matrix crack into crack of SiC particle.关键词：SiC Particle;Aluminum Matrix Composites;Particle Size;Fracture Mechanism
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发布时间：2023-12-18 - 摘要：Using the Gleeble-1500Dsimulator,the high-temperature plastic deformation behavior,the flow stress and constitutive equation of 30%TiC/Cu-Al2O3composites were investigated at 450850℃ with the strain rate of 0.001 1s-1 and total strain of 0.7.The results show that the high-temperature flow stress-strain curves of the composites are characterized by softening mechanism of the dynamic recrystallization,and the peak stress is increased with the decrease of deformation temperature or the increase of strain rate,which reveals that the composites belong to temperature and strain rate sensitive material.Based on the true stress-strain curves,the established constitutive equation represents the high-temperature flow behavior of 30% TiC/Cu-Al2O3composites,and the calculated results of the flow stress are well agreement with the experimental ones.关键词：TiC/Cu-Al2O3Composites;Hot Deformation;Flow Stress;Constitutive Equation
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发布时间：2023-12-18 - 摘要：Effects of pulsed magnetic field（PMF）and trace Cr on microstructure and high temperature mechanical properties of Al-5.3Fe alloy were investigated.The results show that with 0.3% Cr addition,primary Al3Fe compound is transformed from coarse bulky structure or long acicular structure into rosette ones.With the increase of discharging voltage in range of 0250V,average size of primary Al3Fe particles in the alloy contained 0.3% Cr is further decreased,where rosette-like primary Al3Fe phase is converted into fine particular structure.At 300 ℃,the tensile strength and elongation of Al-5.3Fe alloy contained 0.3% Cr under PMF reach up to 147.5MPa and 1.85%,respectively,increased by 48.4%and 172.1%,respectively,compared with those of the alloy without PMF treatment.关键词：Pulsed Magnetic Field;Cr;Al-5.3Fe Alloy;High Temperature Mechanical Properties
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发布时间：2023-12-18 - 摘要：The microstructure,tensile properties and damping capacity of cast Mg-11.3Gd-1.2Y-1.1Al, Mg-15.6Gd-1.2Y-1.0Al,Mg-17.5Gd-1.1Y-1.0Al and Mg-13.2Gd-2.9Y-0.9Al alloys were investigated by tensile testing,XRD（X-ray diffraction）,OM（optical microscopy）and SEM（scanning electron microscopy）.The results indicate that the cast Mg-Gd-Y-Al alloys consist ofα-Mg,Al2（Gd,Y）and Mg24（Gd,Y）5 phases.After solution treatment,strip-like LPSO compounds appear in grain.The tensile properties of as-cast Mg-Gd-Y-Al alloys have close relation with the total content of RE element.A higher total content of RE elements corresponds to the higher strength and lower elongation.After T4 treatment,the yield strength of the alloys is decreased slightly,and the ultimate tensile strength is increased slightly,while the elongation is improved significantly.After T6treatment,the yield strength of the alloys is increases significantly.The yield strength of higher RE containing alloy is increased more than 80MPa.The damping capacity of as-cast Mg-Gd-Y-Al alloys is decreased with the increase of Gd addition,while the T6treatment can obviously increase the damping capacity.The damping ratios P0.1of the four alloys are in range of 4.92%8.22%,belonging to middle damping capacity.The three alloys with higher RE content in total have high yield strength of 230 MPa and good damping capacity in T6 condition,and are the high strength cast Mg alloys with suitable damping capacity.关键词：Mg-Gd-Y-Al Alloy;Damping Capacity;Mechanical Properties;Al2RE;Heat Treatment
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发布时间：2023-12-18 - 摘要：The Al-30Si brake disc was modified with internal cooling mechanical stirring method and compound modification treatment（internal cooling modification combining with refiner modification）.Friction and wear resistance test of Al-30Si brake disc were conducted based on the observation of microstructures.Effects of different modification processes and brake speed,brake pressure on the friction and wear resistance of Al-30Si were investigated,and the wear mechanism was described.The experimental results show that wear resistance of the alloy is improved with decreasing in the average grain size of primary silicon after modification treatment.The compound modified Al-30Si brake disc is suitable for the high-speed braking speed at 3000r/min and the brake pressure of 0.51MPa.The wear mechanism of the modified Al-30Si is characterized by abrasive wear with the amount of fine hard spot distributed in the microstructure.关键词：Al-30Si Alloy;Internal Cooling Mechanical Stirring;Compound Modification;Frictional and Wear
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发布时间：2023-12-18 - 摘要：<正>奥迪（Audi）全面改进了轿跑车"TT",并在第84届日内瓦车展上公开。新款TT继"奥迪A3（AudiA3）"、"大众高尔夫（VolkswagenGolf）"等之后采用了大众集团的新一代平台"MQB",采用铝合金后,车身大幅减轻。车身结构与上代车型一样,继续采用组合使用铝合金与钢板的"ASF"（AudiSpaceFrame,奥迪空间框架）,门槛梁
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发布时间：2023-12-18 - 摘要：<正>一项地质研究显示,朝鲜拥有约2.16亿吨稀土,这些矿物质可被用于智能手机和高清电视等电子产品的生产。一旦被证实,这将使全球已知的稀土储量增加一倍以上。这将是中国的稀土储藏量的6倍,将会成为市场的领头羊。
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发布时间：2023-12-18 - 摘要：<正>金属材料的强度和塑性向来是"鱼和熊掌不可兼得",日本研究人员最新开发出了一种金属材料制作新技术,能让金属材料兼具高强度和高塑性,有望提高医疗和航空等诸多领域金属材料的应用性。例如在医疗和航空等诸多领域,微型医疗器械和人造卫星等都需要质量更高的金属材料,既要满足强度,
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发布时间：2023-12-18 - 摘要：<正>2013年11月4日,敖汉旗万华集团60万吨铸件生产项目主体工程完工。该项目是敖汉旗下重点建设项目之一,由辽宁万华集团公司投资建设,总投资20亿元,占地1200亩,分三期施工建设。其中一期工程投资6.5亿元,建设450立方米高
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发布时间：2023-12-18 - 摘要：<正>国内首个金属燃料电池研究中心落户天津空港经济区。该项目将对电动汽车的技术创新提供动力,推动新能源车的普及。该研究中心负责人称,金属燃料电池以高能量密度的锌、铝、镁等作为燃料,直接将金属中蕴藏的化学能转变成电能,消耗的金属燃料可采用水能、
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发布时间：2023-12-18 - 摘要：<正>20140401 Samuel A M,Doty H W,Valtierra S,et al.添加Mg对319铝合金显微组织的影响.International Journal of Cast Metals Research,2013,26（6）:354-362.319铝合金作为一种典型的Al-Si-Cu合金,因具有较好的铸造性能、高热导率和低热膨胀系数等优点而获得广泛的应用,其物相主要包括a-Al、Al-Si、Si-Mg和Al-Cu金属间化合物（如Mg2Si和CuAl2）。目前,关于319铝合金在热处理过程中的第二相析出序列以及Si颗粒形貌的演变规律已有系统研究,且已
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发布时间：2023-12-18
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