最新刊期
卷 37 ， 期 8 ， 2017
- 摘要：Image analyzer was used to measure quantitatively the amount of primaryα-Al dendrites in the as-cast A356 aluminium alloys grain refined by different Ti-B content.The correlation between mechanical properties and amount of primaryα-Al dendrites in the refined alloys was established.The results reveal that fine equiaxed dendrites can be completely formed when the addition of Al-5Ti-1Brefiner is larger than 0.5%.The amount of primaryα-Al dendrites is increased with the addition of Ti-B content increase.The regression equations reveal a linear relationship between ultimate tensile strength,elongation,quality index and amount of primaryα-Al dendrites.关键词：A356Aluminium Alloy;Mechanical Properties;Grain Refinement;Primaryα-Al Phase
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发布时间：2023-12-18 - 摘要：Mg-11Li-3Al-xZr（x=0,0.1）alloys were prepared by vacuum induction melting and extrusion,and microstructure of the as-cast and as-extruded alloys was observed and analyzed by OM,XRD,SEM and EDS,meanwhile,mechanical properties of the alloys were tested by tensile testing.The results indicate that the Mg-11Li-3Al-xZr（x=0,0.1）alloys consist ofβ-Li,α-Mg,θ-MgLi2Al and AlLi phase.In addition,Al3Zr phase exists in Mg-11Li-3Al-0.1Zr alloy.The grain size of the as-cast alloy exhibits coarse,while dynamic recrystallization occurs during the extrusion deformation.The addition of Zr can refine grain size obviously,where the grain size of Mg-11Li-3Al-0.1Zr alloy is only about 1/4of Mg-11Li-3Al alloy after extrusion.Mechanical properties of the two as-cast alloys are similar,while the elongation of Mg-11Li-3Al-0.1Zr is lower than that of the Mg-11Li-3Al alloy.After extrusion,the two alloys still have the high elongation,and the strength is increased obviously due to working hardening and fine grain strengthening effect.The strength of the Mg-11Li-3Al-0.1Zr alloy reaches 194 MPa,which is increased by 32.8% compared with that of the cast alloy.关键词：Mg-Li Alloy;Extrusion;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：The EDEM software was used to simulate the flow of powder filling in the powder feeding boot,and filling uniformity of powder was analyzed.The results show that when the powder feeding boot moves at a low velocity,the powder flows with the nose type,and the cavity can be filled completely.When the moving velocity of the feeding boot is increased,the powder exhibits a block flow,and the feeding boot drives a part of powder to slide through the die cavity,so it is failure to fill into the mold cavity completely.The equation of powder filling rate is established,which can provide reference data for the optimization of powder filling process.关键词：Powder Feeding Boot;EDEM;Uniformity;Numerical Simulation;Filling Powder Flow
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发布时间：2023-12-18 - 摘要：With the help of tensile test,microstructure observation and fractograph analysis,the microstructure and mechanical properties of rolling Al-Mg-Si-Cu and heat treatment Al-Mg-Si-Cu alloy at the different orientation were investigated.The results show that Al-Mg-Si-Cu alloy has obvious anisotropic characteristics.The strength of the Al-Mg-Si-Cu alloy plate is decreased firstly and then increased while elongation is increases firstly and then decreased with the increase of the orientation angle.After heat treatment,strength and elongation of the alloy are increases firstly and then decreased with increasing in orientation angle.The maximum strength reaches 366.3MPa at 60°,while the maximum elongation reaches up to 24% at 45°.关键词：Al-Mg-Si-Cu Alloy;Planar Anisotropy;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：Effects of rare earth Yb addition on microstructure and mechanical properties of A356 aluminum alloys were investigated by optical microscope,SEM.The results reveal that theα-Al grains in the A356 aluminum alloys can be refined by addition of the rare earth Yb.Secondary dendrite arm spacing in the A356 alloys modified with different Yb content is reduced from 41μm to 30μm.Eutectic Si phase is transformed from accicular and lath-like into fibrous ones.AlSiYb intermetallic compound can be observed in the 0.2% Yb modified alloy.Mechanical properties of the as-cast A356 aluminum alloy are increased firstly and then decreased with increasing in Yb content.With Yb content of 0.2%,the ultimate tensile strength and elongation of the alloy reach 195 MPa and 4.8%,respectively.关键词：Rare Earth Yb;A356Aluminum Alloy;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：Effects of aging treatment on microstructures and properties of 6101 Al alloy were investigated by means of optical microscopy,EDS,tensile machine,hardness testing and electrical conductivity testing,especially for effects of aging temperature and aging time on the mechanical properties and electrical conductivity of 6101 Al alloy.The results reveal that the yield strength and hardness of aluminum alloy are increased with the increase of temperature at 120160 ℃.At a given aging temperature,the strength and hardness of aluminum alloy are increased with the increase of aging time.The optimal aging treatment for 6101 Al alloy is at 140 ℃for 8h.关键词：Smelting-Casting;Aluminum Alloy Conductor;Aging Treatment;Mechanical Properties;Electric Conductivity
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发布时间：2023-12-18 - 摘要：The solidification process of GCr15 slab prepared by mould casting method was visualized by means of ProCAST softwave based on Pro/E modeling.The temperature field and solidification fraction of steel ingot were analyzed to visualize the potential shrinkage porosities（holes）position.In addition,the macro-structure was observed.The microstructure of the slab was observed by scanning electron microscopy（SEM）.The effects of microstructure on friction and wear behavior of the slab were analyzed by display material-end high temperature wear-frictional tester.The results reveal that the solidification tendency of the ingot is advanced from the bottom to the top of steel ingot and radially from the mold wall to the center of the ingot.In addition,the shrinkage holes are concentrated in the cap of the ingot,and shrinkage porosities are easily formed in the center of the ingot.The strip-like and hexagonal prismshaped M7C3 carbides have greatly effects on the wear resistance of the GCr15 slab.关键词：GCr15Steel;Mould Casting;ProCAST;Numerical Simulation;Shrinkage Porosities（Holes）
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发布时间：2023-12-18 - 摘要：Through design of the feeding system of simple aluminum silicon alloy components and analysis of relationship between the solidification time and the riser size,a model was established.Through summarizing the common method of gating system design,the design model of gating system was developed.Through using MyEclipse software as the system development platform,and compiling the scripting program by the Java language,as well as creating and managing the database through MySQL and JDBC components,development of the auxiliary design platform of aluminum silicon alloy castings was completed through the platform compilation and connection.Finally,the accuracy and reliability of the feeding system were verified by the case of pump shell.关键词：Aluminum Silicon Alloy;Feeding System;Auxiliary Design Platform
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发布时间：2023-12-18 - 摘要：The current research of ultra-fine grained metallic materials processed by severe plastic deformation（SPD）was described,focusing on equal channel angular pressing（ECAP）and high pressure torsion（HPT）.The grain refinement mechanism of metallic materials produced by SPD was discussed.The effects of SPD techniques on strength,ductility and mechanical properties of the materials were analyzed,and influence rules of corrosion properties was also analyzed.The application of SPD for ultra-fine grained materials was prospected.关键词：Ultra-Fine Grained Materials;Grain Refinement;Mechanical Properties;SPD
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发布时间：2023-12-18 - 摘要：The preparation technology and application of copper/aluminum composite were introduced.It was summarized for mechanism of interface combination,formation process of interfacial layer,the formation and growth rule of intermetallic compounds in interface layer and its effects on the physical and mechanical properties of composites.Finally,the research direction and development trend was proposed.关键词：Copper/Aluminum Composite;Compound Mechanism;Intermetallic Compounds
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发布时间：2023-12-18 - 摘要：Hypereutectic ZL117 alloy piston was prepared by semi-solid squeeze casting,and variation tendency of primary Si in different position of the piston was investigated through analysis of microstructure evolution.The results show that the diameter of primary Si particle and solid phase rate are increased from up to down.The diameters of middle and under parts are 16.6% and 24.7%larger than that of the up one,respectively.Meanwhile,the solid phase rate at the under part is 345% higher than that of the bottom part.It can be concluded that the Si content is the smaller than that of the middle and under parts,and in contrast with the middle and under parts,the Si refinement in the upper part is desirable.关键词：Semi-solid Squeeze Casting;Hypereutectic Al-Si Alloy;Piston;Primary Si
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发布时间：2023-12-18 - 摘要：Semi-solid 6061 alloy slurry was prepared by manual stirring,and then the semi-solid castingforging forming of 6061 alloy was carried out by using press and cup-shaped mold to analyze effects of holding time on the segregation of 6061semi-solid casting-forging components.The results reveal that with increasing in holding time,content of Si,Cu and Mg in the upper,middle and bottom of the specimen is near to the original content.With the hold time of 0s,1sand 2s,the content of Si、Cu and Mg elements is the higher than original content in the specimen of upper and middle,which is positive segregation,however,the content of Si、Cu and Mg elements is the lower than original content in the specimen of bottom,which is negative segregation.When the holding time is 3sor more,the segregation of Si,Cu and Mg elements can be decreased greatly in the upper,middle and bottom of the specimen.关键词：Semi-solid Casting-forging;Hold Time;6061Alloy;Composition Segregation
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发布时间：2023-12-18 - 摘要：The process of die casting zinc alloy handle was analyzed,and design process of mould structure,parting surface selection,gating system design and design of stripping mechanism of die-casting die for die-casting chamber presser were introduced.The working principle and structural characteristics of the mould were described,which provided a reference for die casting mould design of the horizontal hot chamber presser.关键词：Zinc Alloy;Die Casting Die;Die Casting
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发布时间：2023-12-18 - 摘要：Air evacuation in vacuum die casting process was analyzed.A new mathematical model was established to calculate cavity pressure,and leakage of die was also taken into acount in the model in order to fit with practical conditions.The model was verified by fitting with actual cavity pressure data recorded by the vacuum system in practical die casting process.Furthermore,influences of evacuation efficiency and die leakage on cavity pressure were discussed.And the fitting equation parameters can be used to assess vacuum system and die sealing.关键词：Vacuum Pressure Die Casting;Cavity Pressure;Die Leakage;Mathematical Model
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发布时间：2023-12-18 - 摘要：Mould design,differential pressure casting and heat treatment technology of the aluminum alloy middle transmission housing were analyzed,and the aluminum alloy middle transmission housing was prepared and tested for surface quality,internal quality and mechanical properties.The results reveal that the aluminum alloy middle transmission housing exhibits clear surface quality with absence of misrun,cold shut,hot tearing and other casting defects.Microstructure of the transmission housing has the features of dense without porosity and oxide inclusions and other casting defects.Fracture of the aluminum alloy middle transmission housing is characterized by ductile structure.The tensile strength and elongation of the housing after heat treatment reach 397 MPa and 6%,respectively.关键词：Alloy Transmission Housing;Differential Pressure Casting;Casting Defects
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发布时间：2023-12-18 - 摘要：The design of the squeeze casting process for aluminum alloy frame was carried out,and the filling and solidification process of squeezing casting was simulated to predict occurrence of porosity shrinkage defect.Origination of shrinkage porosities（holes）in squeezing casting aluminum alloy frame was described.By adopting partial pressurization and setting feeding channel,shrinkage defects in the aluminum alloy frame were eliminated.Through reverse local pressurization with pressure of 100 MPa for0.5s,partial pressurization effect exhibits desirable.The practical production reveals that the aluminum alloy frame has the desirable quality with absence of defects,where the as-cast tensile strength and elongation reach 271 MPa and 6.52%,respectively,meeting requirements.关键词：Seat Frame;Aluminum Alloy;Squeeze Casting
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发布时间：2023-12-18 - 摘要：The die casting process for Al alloy thermostat shell was designed.The fluid field,temperature field and shrinkage cavities（porosity）during filling and solidification process were simulated to optimize the die casting process.By adding cooling water channel,the temperature field was optimized effectively,and shrinkage cavities（porosities）in the Al alloy thermostat shell were reduced greatly.After verification of the practical production,the optimized process can produce high-qualified Al alloy thermostat shell.关键词：Die Casting;Numerical Simulation;Temperature Field;Shrinkage Cavities（Prorosities）
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发布时间：2023-12-18 - 摘要：For tubular parts with long size and multi-direction hole,selection of parting surface and the division of the molding part will determine the number of core pulling mechanism and the core pulling method.In the design of die-casting die,the mould of the steering gear housing adopts the plane parting along the center line.The layout of two hydraulic core pulling mechanisms and four mobile inclined guide columns core pulling mechanism can simplify the structure of the die.The practical production verifies that the scheme is reasonable and feasible.关键词：Die-casting Die;Steering Gear Housing;Core Pulling Mechanism
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发布时间：2023-12-18 - 摘要：The 100% DZ125 revert superalloy was purified into revert ingot by vacuum horizontal continuous casting（VHCC）.The inclusion level of revert ingot was determined by electrolysis.The chemical composition analysis,gas content and microstructure were also investigated.The results show that the content of bulky inclusions in vacuum casting DZ125 alloy ingot reaches the level of virgin alloy,which is reduced to 5.74mg/（10kg）from average 8.30mg/（10kg）.The chemical composition,oxygen and nitrogen content,and microstructure of the revert alloy exhibit little difference with the virgin alloy,which can fully meet the requirement of DZ125 alloy technical standard.关键词：DZ125Alloy;Vacuum Horizontal Continuous Casting;Superalloy Revert;Inclusions
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发布时间：2023-12-18 - 摘要：The effects of solid solution + two-step aging on the morphology and precipitates in the Inconel 718 superalloy by selective laser melting（SLM）were investigated.It is found that,the microstructure of SLM as-deposited alloy exhibits elliptical grain,which consists of the tiny columnar grain.After solid solution treatment,the columnar grains in as-deposited alloy are transformed into the equiaxed grain.The grain size is increased with solution temperature increase.The various precipitates can be precipitated at the grain boundary and in the grain after solution+two-step aging.Short rod-likeδphases can be observed at the grain boundary during 9401 020 ℃ solution,while needle-likeδ,discshapedγ″and dark spotγ′phases can be observed in grain with aging at 620720 ℃.关键词：Inconel 718Superalloy;Solid Solution and Aging;Microstructure;Precipitates
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发布时间：2023-12-18 - 摘要：The cyclic oxidation behavior of as-forged Ni60 Ti alloy was investigated at 750850 ℃in air environment.The cross-sectional morphologies and phase constituent of the alloy were observed by optical microscope（OM）,X-ray diffractometry（XRD）,scanning electron microscopy（SEM）and energy dispersive spectroscopy（EDS）.The results reveal that with increasing in temperature,oxidation rate and weight-increment are increased.At the early stage of the cyclic oxidation,values of reaction order（n）are less than 2.At the late stage,the values of nat 750℃and 800℃are more than 2,while it is 1.927 at 850℃as a result of oxidation layer cracking and spalling.With temperature and duration increase,a four-layered structure oxidation layer is composed as follows from surface to inner layer:pure TiO2 rutile,a layer of mixture of TiO2 and NiTiO3,a layer of mixture of TiO2,NiTiO3 and Ni,Ni3 Ti layer.关键词：Ni60Ti Shape Memory Alloy;Cyclic Oxidation;Oxidation Kinetics;Oxidation Layer
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发布时间：2023-12-18 - 摘要：In order to improve the wear resistance of H13 steel,SiCp/Ni35 coatings on H13 surface were prepared by laser cladding.Coating phases,microstructure and elements in the coating were analyzed by XRD,OM,SEM and EDS.Microhardness of coating was tested by microharness tester.The room temperature and high temperature wear resistances of coatings were tested by high temperature wear tester.The results reveal that coating is composed of solid solution of Ni,reinforcing phase M7C3,borides,silicides and graphites.Coating exhibits the better microhardness,room temperature and high temperature wear resistance than H13 steel.关键词：Laser Cladding;SiCp;Ni35;High Temperature Wear
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发布时间：2023-12-18 - 摘要：Continuous carbon reinforced aluminum matrix composites were prepared through electromagnetic forming technology to improve serious interface reaction,long preparation period and high device requirement in traditional methods.The effects of discharge voltage on microstructure and mechanical properties of the composites prepared by the optimized parameters,such as the preheating temperature of carbon fiber of 380 ℃,smelting temperature of aluminum alloy of 900 ℃ and heat preservation temperature of 750 ℃.The results reveal that with the charging voltage of 2 500 V,interfaces of the composites exhibits well-bonded with absence of Al4C3 brittle phases in the interfaces.Compared with those of the matrix,the tensile strength and Brinell hardness of Cf/Al composites are increased from 91.10 MPa to 101.76 MPa,increased by 11.7%,and 35.8HBW.关键词：Aluminum Matrix Composites;Electromagnetic Forming;Discharge Voltage;Microstructure
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发布时间：2023-12-18 - 摘要：The Al5052-foam copper-Al5052 sandwich plates with 1.0,1.5and 2.0mm foam copper were clinched and the cross-section of the joint was observed intuitively.The tensile-shearing test was carried out to analyze the load carrying capacity and energy absorption capacity of the joint.The fracture of the failure joint was observed by scanning electron microscopy（SEM）,and the failure mechanism of the joint was described from the micro level.The experimental results show that with thickness of the foam copper increase,thickness of the neck is increased,so the undercut is decreased,and the load carrying capacity is increased correspondingly,however,effects on the energy absorption capacity can be ignored.The failure of the joint is characterized by neck failure,and the microstructure exhibits dimple fracture.关键词：Clinch;Foam Metal;Tensile-Shearing Test;Fracture Analysis
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发布时间：2023-12-18 - 摘要：The solidification process of ZL204 Aboot castings was analyzed by OM,SEM,universal mechanical performance testing machine and FEM simulation.The results show that a solidification sequence from bottom to top and from outside to inside can be realized by adopting the open free filling process combined with the design of section ratio of 1∶5.8∶10（sprue:riser:ingate）and the filling action of the riser at the end of solidification based on the optimization of the temperature and solidifi cation solid fraction distribution field by the FEM simulation.The average grain size in as-cast boot castings is only 84μm,and the average tensile strength,yield strength and elongation of the boot castings after T6 treatment reach 472 MPa,370MPa and 8.4%,respectively.The crack mechanism is characterized by micro-dimple with some intergranular fracture zone.关键词：ZL204AAlloy;Solidification Process;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：Different content Al-Ti-C refiner was added into 2219 aluminum alloy,during the solidification and the microstructure of ingots with different Al-Ti-C refiner was analyzed comparatively by OM and DSC.The effects of Al-Ti-C refiner on nucleation and undercooling degree of 2219 aluminum alloy during the solidification were investigated.The results reveal that the microstructure is refined with Al-TiC refiner and the satisfied refinement effects can be observed with 0.5%refiner.The unercooling degree of the aluminum melt is affected by refiner content,where it is decreased gradually with the increase of refiner content,however,with refiner content more than 0.5%,decrease of undercooling degree can be ignored.TiC particles from decomposition of Al-Ti-C refiner can be acted as the nuclei of heterogeneous nucleation,and these particles will gather to increase the substrate size,which decreases the contact angle and the critical nucleation energy,finally the undercooling degree needed for nucleation is decreased.关键词：2219Aluminum Alloy;Al-Ti-C Refiner;Undercooling Degree;Mass Fraction
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发布时间：2023-12-18 - 摘要：The dynamic recrystallization of TC16 titanium alloy was investigated by isothermal constant strain rate compression deformation test at 750950 ℃ and strain rate of 110s-1.The flow stress constitutive equation of TC16 titanium alloy was established based on the stress-strain curve.The dynamic recrystallization critical strainεc was derived from the curve of strain hardening rate to strain（θ-ε）.The experimental results reveal that the decreasing amplitude of flow stress at 700850 ℃is larger than that at 850950℃at a fixed strain rate.The recrystallized grain size in microstructure of the alloy is further refined at deformation rate of 50% with the high strain rate（such6）ε=10s-1).关键词：TC16 Titanium Alloy;Flow Stress;Microstructure;Dynamic Recrystallization
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发布时间：2023-12-18 - 摘要：The friction stir processing（FSP）experiment was carried out on AZ31 magnesium alloy extrusion profile.The effects of FSP on the working hardening rate and mechanical properties of the samples were investigated by means of optical microscope and sample stretching equipment.The results reveal that the grain of AZ31 magnesium alloy is refined by frictional stirring processing.The uniform elongation and the total elongation are similar（about 22%）.When the tensile strain is more than 0.03,the working hardening rate of the alloy in the stirring zone is more than the base material,and the deformed twin crystals can be observed both in the stirring zone and base metal.The deformed twin crystals in the stirring zone exhibit a ribbon distribution,leading to the higher working hardening rate.关键词：Friction Stir Processing;Working Hardening Rate;Mechanical Properties
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发布时间：2023-12-18 - 摘要：Al-Mg2 Si composite coatings were fabricated on AZ31 Bmagnesium alloy by the flame spraying with Al and Mg2Si mixed powders.The XRD,SEM and EDS were used to analyze the phase composition,microstructure and element distribution of the coating.The potential corrosion and corrosion current density of the sample were investigated by electrochemical experiment,and the corrosion rate of the sample was tested by immersing experiment in the same solution.And then,the micro-hardness was tested.The effect of Al contents on the microstructure and corrosion resistance of the coating was analyzed through above experiments.The results reveal that the relative density of the coating with decrease of cracks and holes is increased with the increase of the content of Al in the coating.The corrosion resistance and micro-hardness of composite coating,where potential corrosion is-1.363 5Vand corrosion current density is 0.457 8 mA/cm2 and micro-hardness reaches approximately 300 HV,becomes desirable when content of Al is 60%.关键词：AZ31B Mg Alloy;Flame Spraying;Al-Mg2Si Coating;Corrosion Resistance
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发布时间：2023-12-18 - 摘要：Large-sized thin-walled titanium hood was prepared successfully by graphite mold casting.Three sets of gating systems were designed for the large height and thin wall of hood including horizontal stepped gating system,top gating system from the beginning and the tail.Experiments show that many surface cracks can be observed in the hood with the horizontal stepped gating system,which can not meet the product requirements.Two kinds of top gating system are able to produce high quality titanium alloy hood with less surface cracks.关键词：Titanium Alloy;Thin-walled Casting;Surface Crack;Casting Process
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发布时间：2023-12-18 - 摘要：The creep properties of unmodified and modified Al-Cu alloy with different content of La at 180℃,200 ℃ and 220 ℃ were analyzed comparatively.The microstructure evolution of unmodified and La modified ZL205 Aalloy at different temperature and applied stress was observed,and the mechanism of high temperature creep of La modified ZL205 Aalloy was described.The results reveal that,under the same creep temperature and applied stress,the steady creep rate of La modified ZL205 Aalloy is the lower than that of the unmodified ZL205 Aalloy,and the steady creep rate of 0.3%La modified ZL205 Aalloy is the lower 34times than that of the unmodified ZL205 Aalloy.The apparent stress exponent of La modified ZL205 Aalloy is the higher than that of unmodified ZL205 Aalloy under the same temperature,and the apparent stress exponent of 0.3%La modified ZL205 Aalloy exhibits the highest value.The creep control mechanism of ZL205 Aalloy with and without La modification is characterized by high temperature dislocation slip or climb.After the modification of ZL205 Aalloy by adding La element,the amount of nano phase in the alloy is increased,and the high temperature stability of the nano phase is improved.The morphology change of discontinuous granular Al11La3 phase at the grain boundaries of0.3% La modified ZL205 Aalloy can be ignored before and after creep,which can play a role in preventing the grain boundary movement during the high temperature creep.关键词：La;ZL205AAlloy;Modification;Microstructure;Creep Behavior
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发布时间：2023-12-18 - 摘要：The effects of Mn,Ce and cooling rate on the microstructure of Al-Mn alloy were analyzed.The results reveal that with the increase of Mn content,lath-shaped structure Al6Mn is changed from parallel distributions to mess coarse.With Ce from 0.15%to 0.45%in Al-Mn-Ce alloy,Ce mainly exists in form of Al3Ce.The microstructure of the alloy is refined with the increase of cooling rate.关键词：Al-Mn Alloys;Ce;Microstructure
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发布时间：2023-12-18
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