最新刊期
卷 37 ， 期 2 ， 2017
- 摘要：New ultrasonic-assisted soldering technology was adopted to weld four sets of Cu/Sn-Bi-1.5Al2O3/Cu micro-butt butt joints by adjusting the ultrasonic power.Through wetting testing,microstructure observation,micro-hardness experiment,tensile testing,fracture morphology analysis,effects of ultrasonic power on microstructure and properties of the Sn-Bi-1.5Al2O3/Cu solder joint were evaluated comprehensively.The results show that the filling ability of the composite solder is enhanced,and the largest spreading area is increased by 51.7% based on utilizing the secondary effects of ultrasonic cavitation and acoustic streaming of the ultrasound in liquid solder.After ultrasonic treatment,with the increase of ultrasonic power,fine grain strengthening is generated,and microstructure is improved with the decrease of defect.When the ultrasonic power is 800 W,the Bi phase content is decreased by 4.7%compared with ones in un-ultrasonic treatment.Meanwhile,hardness of the central brazing seam and IMC layer on boundary is increased by 40.7%and 89.9%,respectively,in addition,the tensile strength and elongation are increased by 40.7%and 89.9%,respectively,and the fracture position is transferred from the brazing seam boundary gradually to the central joint.关键词：Ultrasound;Solder;Sn-Bi;Mechanical Properties
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发布时间：2023-12-18 - 摘要：Semi-solid aluminum alloy was prepared by pulsed magnetic field-inclined pipe casting compound preparation method.According to theory of compound preparation of semi-solid alloy,the semisolid preparation device was developed.Influences of different inclined angles and pulsed voltage on the semi-solid microstructure were investigated.The results show that the microstructure is changed from the rosette or dendritic structure into granular grains with spheroidization of grains and the decrease of eutectic microstructure with increasing in voltage.When the pulse voltage is low,the spheroidization of grains exhibits the better in low inclination angle.The spheroidization of grains becomes desirable increasingly with the increase of pulsed voltage.The formation of the semi-solid microstructure is attributed to the combined action of the nucleation thermodynamics and effects of mixing,shearing collision.关键词：Semi-solid;Pulsed Magnetic Field;Inclined Pipe;Aluminum Alloy
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发布时间：2023-12-18 - 摘要：Microstructure and mechanical properties of Mg-xEr-0.6Zr（x=0,1,1.5,2）alloys were investigated by means of optical microscope and scanning electron microscope.The results show that the tensile strength and yield strength of as-cast Mg-xEr-0.6Zr alloys at room temperature are increased firstly and then decreased with the increase of Er addition.The elongation of as-extruded Mg-xEr-0.6Zr alloys is improved by 150%,150% and 180%,comparing with as-cast alloys at 300 ℃ and extrusion ratio of16∶1,meanwhile,yield strength of the alloys is improved with the increase of Er content,and tensile strength of the alloy is decreased.With aging treatment at 170℃for 8h,yield strength of the alloys is increased by 18%,13% and 27%,respectively,and the elongation keeps about 25%.关键词：Mg Alloy;Rare Earth Er;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：The as-extruded AZ31 magnesium alloy was subjected to impact loading at room temperature with different strain rates（1 0003 000s-1）using a split Hopkinson pressure bar.The microstructure and facture morphology of the alloy samples were observed by optical microscopy and scanning electrical microscopy.The results show that fracture risk is increased with strain rate increase.The main fracture modes of the alloy are characterized by intergranular fracture and transgranular rupture.The fracture morphology exhibits a typical characterization of the quasi-cleavage fracture.Twinning and grain boundaries are the nucleation position of crack,and the competitive relationship between the twinning nucleation and crack initiation can be obserevd.关键词：Twinning;Crack;Intergranular Fracture;Transgranular Rupture;Quasi-cleavage Fracture
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发布时间：2023-12-18 - 摘要：A high zinc content alloy of Al-11Zn-2.4Mg-2.1Cu-0.1Zr was fabricated,and effects of heat treatment such as quenching temperature,cryogenic treatment and aging on microstructure and mechanical properties of the alloys prepared were analyzed comparatively.The results reveal that the quenching cool rate and the solid solubility of supersaturated solid solution phase are increased obviously with the decrease of the quenching temperature,so the inducing force of aging phase transition is increased significantly,leading to the smaller size of precipitation strengthening phase,whereas the precipitation number and density of strengthening phase distributed in the grain and nearby the grain boundaries are increased greatly,resutting in the improvement of tensile strength.The mechanism of cryogenic treatment is mainly characteried by pre-aging,which is controlled evidently by the volume size of components.Comparing with the aging treatment at 135℃for 16 h,more GP zones andη’precipitation strengthening phases can be observed both in the grain and nearby the grain boundaries with aging treatment at 120℃for 24 h,where the average tensile strength,yield strength and elongation reach 716 MPa,702MPa and8.9%,respectively.关键词：Al-Zn-Mg-Cu Alloy;Heat Treatment;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：The two constitutive models of dynamic recrystallization dislocation theory and the theory of phenomenological for TC21 alloy were established based on high temperature hot compression test data.Quasiβforging deformation process of TC21 alloy was simulated by using DEFORM-3Dfinite element software at 975℃ based on the established models.The results reveal that the dynamic recrystallization at large regions is fully developed,so grain size is the refiner than that in other regions.Relative error of grain size simulated is below 10% compared with experimental ones.Average grain size is refined with the increase of strain rate at the same deformation region.CA simulation is well in agreement with metallographic microstructure.The simulated results can provide reference for the establishment of related to thermal processing.关键词：TC21Titanium Alloy;Quasi β Forging;Dynamic Recrystallization;Microstructure Simulation
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发布时间：2023-12-18 - 摘要：With the development of aerospace technology,spacecraft materials are developing toward directions of reducing structural weight,improving performances and decreasing manufacturing costs,while the light weight is an important factor to impede its development.The Mg-Li alloys are considered to be the lightest structural materials,and have the high specific strength and stiffness characteristics.These alloys have the greatly potential application in the fields of aeronautics,astronautics and weaponry,particularly in the deep space exploration and micro-nano satellites.The researching status,application prospect in the astronautics and the key problems of Mg-Li alloys were reviewed.关键词：Spacecraft;Superlight Mg-Li Alloy;Research Progress;Key Technology
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发布时间：2023-12-18 - 摘要：In order to make the simulation data more available for machine learning,two main analysis methods,such as empirical formula and manual analysis,were combined in defect prediction.The extract technology of the casting voxel which is based on the direct volume rendering technology is presenetd.The practical case shows that the method can extract effectively and accurately and save the defect content.In this way,the analysis experience was saved,and therefore,all these saved experience will become the basic data for the following research.关键词：Extract Technology;Defect;Casting Simulation;Direct Volume Rendering
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发布时间：2023-12-18 - 摘要：It is easy to generate conflux vortex at the outflow of molten steel during changing tundish.The conflux vortex can lead to the molten steel to absorb slag and air,decreasing the quality of the steel.Generally,tundish should install common flow control devices,such as stopper rods and weirs,to optimize the flow field.For four-strand round billet symmetrical T-shape tundish of a domestic steel plant,mathematical simulation was adopted to understand influences of stopper rods and weirs on conflux vortex at the outlet of tundish,and it was verified with water model.The results reveal that the effect with stopper rods and weirs to inhibiting the formation of conflux vortex exhibits desirable.关键词：Tundish;Flow Field;Conflux Vortex;Mathematical Simulation
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发布时间：2023-12-18 - 摘要：A new type of semi-solid processing method that is rotating-rod induced nucleation（RRIN）was used to fabricate semi-solid slurry.The effects of RRIN method on Fe-rich inter-metallic phase in hypereutectic Al-Si alloy were investigated.The mechanism of RRIN refining the inter-metallic phase in alloy microstructure was described.The results reveal that the inter-metallic phase can be refined effectively by RRIN,and its equivalent diameter is reduced to about 39μm from 170250μm in as-cast microstructure,and composition of the inter-metallic phase presents asδ-Al4FeSi2.With the rotating speed at 500r/min,the melt spreads around the surface of the rod as much as possible,so the melt can obtain a large and uniform degree of supercooling,where RRIN exhibits the desirable refinement for the Fe-rich inter-metallic phase.关键词：Hypereutectic Al-Si Alloy;Rotating-rod Induced Nucleation（RRIN）;Fe-rich Inter-Metallic Phase;Refinement
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发布时间：2023-12-18 - 摘要：The filling flow process of the semisolid aluminum alloy was simulated by the semisolid apparent viscosity model coupled with fluid basic equation and FEM as well as staggered grid method.The fluid field of semi-solid aluminum alloy was calculated,and the simulated results were verified through the experiment of the sample strip.The results show that the semisolid alloy slurry can flow forward slowly along the cavity wall compared with the common aluminum alloy.The front of the free surface flows smoothly.The simulated results are well in agreement with the experiment ones in the similar conditions.关键词：Semi-solid;Aluminum Alloy;Filling Flow;Apparent Viscosity Model
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发布时间：2023-12-18 - 摘要：The filling and solidification process of A356 alloy by semi-solid squeezing casting was simulated by the Anycasting software.Effects of the injection speed and pouring temperature on squeezing casting process were investigated.Through analyzing defects,the processing parameters and the mould were optimized.The results show that high-quality castings can be produced with the mould preheating temperature of 200 ℃,the pouring temperature of 600 ℃,the injection speed of 0.5 m/s and ingate thickness of 5mm.关键词：A356 Alloy;Semi-solid;Squeezing Casting;Simulation
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发布时间：2023-12-18 - 摘要：A new generation of high-performance engine oil pan was produced by using the synchronous design to improve the product structure and adopting high pressure oil pipe insert special process.By improving the steel pipe shape and process to narrow shape tolerance,the positioning accuracy and consistency were improved.By modifying the mold design,stability of the steel pipe insert installation and die casting process was improved.Through steel preheating and knurling process,the problem of products leakage was eliminated.In addition,steel pipe insert cleaning and antirust process was developed to solve product pipe rust in the process of die casting and processing,effectively ensuring the product high pressure oil airtight performance and cleanliness and making a successful product design and production.关键词：Steel Pipe Insert;Mold Design;Cleaning and Antirust Technology
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发布时间：2023-12-18 - 摘要：Influences of mechanical vibration,amplitude and frequency on microstructure and mechanical properties of the AlSi9 Mg alloy were investigated,and the mechanism of its action was described.The results show that the average grain size of AlSi9 Mg alloy in Zdirection is the smallest,and hardness,tensile strength and elongation of the alloy reach maximum values,respectively,followed by XY,while average grain size of the AlSi9 Mg alloy in X,XZand XYZdirection is slightly increased,and Brinell hardness,tensile strength and elongation rate are relatively decreased.With the increase of the mechanical vibration amplitude and vibration frequency,average grain size of the AlSi9 Mg alloy is decreased firstly and then increased,while hardness,tensile strength and elongation of the alloy are increased firstly and then decreased.The suitable mechanical vibration parameters for AlSi9 Mg alloy in lost foam casting are presented as follows:mechanical vibration direction in Zdirection,mechanical amplitude of0.10 mm,mechanical vibration frequency of 36 Hz,and the desirable strength and plasticity can be obtained under the optimized parameters.关键词：Mechanical Vibration;AlSi9Mg Alloy;Microstructure;Property
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发布时间：2023-12-18 - 摘要：In order to eliminate hot cracks in the high manganese steel eccentric sleeves during centrifugal casting,a temperature-adjustment mould was used to prepare eccentric sleeves with absence of cracks.The results reveal that the radial tensile stress in inter-layer resulted from different solidification sequence in the middle of eccentric sleeves can be decreased through increasing solidification speed of outerlayer and promoting the sequential solidification from outer to inner layer.And the temperature-adjustment mould can reduce the tangential tensile stress by thermal insulation for thin wall and cooling for thick wall to decrease the solidification speed difference of different wall-thick zone.Both of the two ways can decrease the tendency of the hot crack for eccentric sleeves.关键词：Hot Crack;Eccentric Sleeve;Austenitic Manganese Steel;Centrifugal Casting;Temperature Adjustment Mould
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发布时间：2023-12-18 - 摘要：A mesh pattern with 13×13meshes and 1mm in thickness was designed to investigate the filling ability of the wax.Influence of three processing factors,such as temperature of the wax,injection time of the wax and injection pressure,on the filling ability of the wax was analyzed by orthogonal experiments,respectively.The results show that the filling ability can be affected directly by those processing factors.However,the temperature of the wax has a major effect on the filling ability of the wax.A completely pattern was manufactured by the experimental condition with temperature of 56 ℃,injection time of 5sand injection pressure of 4 MPa.关键词：Investment Casting;Filling Ability;Wax Pattern;Processing Parameters
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发布时间：2023-12-18 - 摘要：Furnace tilting speed control method was used to accomplish constant flow rate casting of nonferrous metal billets with small cross section.Based on the mathematical model of constant flow rate,the corresponding control procedure was designed in a programmable logic controller.The application of this technology can simplify furnace structure and improve size uniformity of the billet with small cross section.关键词：Continuous Casting;Constant Flow Rate Casting;Billet with Small Cross Section
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发布时间：2023-12-18 - 摘要：Influences of electromagnetic stirring melt treatment on microstructure and mechanical properties of the drive rotary shaft were investigated.The results reveal that the electromagnetic stirring can not only refine the grains and increase the proportion of equiaxed grain in the casting billet,but also reduce the casting defects such as shrinkage,inclusion and porosity.After forging and normalizing treatment,the grain sizes in the shaft with electromagnetic stirring during solidification become the smaller and more homogeneous than that without electromagnetic stirring,so microstructure and mechanical properties of the shaft are improved obviously.In addition,ultimate tensile strength,yield strength and percentage reduction of area are increased by 3.7%,7.0%and 26.3%,respectively.
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发布时间：2023-12-18 - 摘要：A series of Al-Ni composites were fabricated by friction stirring processing,and then were post-treated at different temperatures.Results show that the Al-Ni composites prepared are composed of Al3 Ni,and a few Ni is not participated into reaction.After heat treatment at 450℃for 6h,the reaction degree between Ni and Al will be increased,and Al3Ni、Al3Ni2phases are generated.Hyperplasia,diffusion of defect and interaction of defect can deduce reaction to be further conducted during heat treatment process.关键词：Frictional Stirring Processing;Post Heat Treatment;Intermetallic Compound;Microstructure
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发布时间：2023-12-18 - 摘要：Effects of different laser power and scanning speed on microstructure and microhardness of high aluminum bronze laser cladding coatings on Q345 steel were investigated by single factor and single channel experimental method.The results show that aluminum bronze laser cladding coatings exhibit metallurgical bonding with Q345 steel,and microstructure is compact with absence of defects such as stoma and crack.Microstructure of the coating is converted from fine equiaxed grain to lots of dendrite with the increase of laser power intensity.The coating is mainly composed ofα、β、γ2、κand Fe phases.Hardness is the highest at HAZ,then at the coating and then at the substrate.With the increase of scanning speed,hardness of the coating is increased gradually.With the increase of laser power,the hardness of coating is decreased gradually.关键词：Laser Cladding;Aluminum Bronze;Microstructure;Hardness
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发布时间：2023-12-18 - 摘要：Through adding 15% Ti powder into Al2O3 preform,Al2O3/65 steel composites with Ti activation were prepared to understand effects on microstructure,wettability and performance.Compared with composites without Ti powder,ferrite content in the composites with Ti powder is increased,and TiC interface layer is generated.Enhancement particles exhibit metallurgical bonding with matrix interface,where wettability angle is decreased from 125°to 75°.In addition,hardness,bending strength and abrasive wear of the composites are improved.关键词：Al2O3p/65 Steel Composites;Ti Powder;Wettability Behavior;Microstructure
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发布时间：2023-12-18 - 摘要：Effects of different extrusion processing parameters on microstructure and extrusion force of the Mg-6Al alloy were investigated by using a small extrusion die and electronic universal testing machine.The results indicate that,incomplete dynamic recrystallization can be obserevd in homogenized Mg-6Al alloy during extrusion under different conditions,and a part of the original microstructure is remained.Most of the recrystallized grains are nucleated at the boundaries of original grains and twins.With extrusion temperature increase,both the maximum value of extrusion force and the steady extrusion force are reduced.With the extrusion rate increase,difference between the maximum value of extrusion force and the steady extrusion force is increased.In addition,with the ratio of extrusion increase,the maximum value of extrusion force and the steady extrusion force is increased.关键词：Magnesium Alloy;Hot Extrusion;Microstructure;Extrusion Force
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发布时间：2023-12-18 - 摘要：The ZK60 Mg alloys were fabricated by powder metallurgy,and then subjected to equal channel angular pressing at varied temperature and passes.Effects of pressing temperatures and passes on mechanical properties and microstructure of Mg alloys were investigated.The results reveal that the ECAP processing of the ZK60 can be realized at a higher temperature,and tensile strength and elongation of the ZK60 alloy exhibit desirable at 260 ℃.An equiaxed ultra-fine grained structure with the mean grain size less than 10μm can be observed after three passes at 260℃,and the tensile strength and elongation of the extruded alloys reach 341.5MPa and 29.3%,respectively.The results show that the appropriate pressing temperature and passes are beneficial to improving mechanical properties of ZK60 alloys.关键词：Mg Alloy;ECAP;PM;Mechanical Properties
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发布时间：2023-12-18 - 摘要：The 7050 aluminum alloys were treated by homogenization,and hardness and microstructure of the homogenized samples were analyzed to optimize the heat treatment parameters.The results show that with homogenized at 480 ℃for 24 h,the alloy exhibits the desirable structure with low over-burning and high hardness.In addition,dissolved secondary phase contained Cu can be observed at the grain boundary with the shape transformed from bulky structure into discontinous particles.关键词：7050 Aluminum Alloy;Heat Treatment;Homogenization
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发布时间：2023-12-18 - 摘要：The effects of high pressure on mechanical properties and electronic structures as well as its stability of Ni-Sn binary compounds（Ni3Sn4、Ni3Sn2、Ni3Sn）were analyzed by first principle calculation based on density functional theory method.The results reveal that the calculated lattice parameters of various compounds at zero pressure are agreement well with the available experimental values and previous theoretical data.The values of relative V/V0 are decreased to be slight with increasing in pressure.The formation enthalpy is negative,and it is decreased with pressure increase.Thus high pressure can improve the ability of alloying.In addition,pressure can improve the hardness of six compounds.Besides,all the considered compounds exhibit ductile and plasticity.The results indicate that the increase of pressure can improve the comprehensive mechanical properties of the compounds.关键词：First-principles;Ni-Sn Binary Compounds;Mechanical Properties;Electronic Structures
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发布时间：2023-12-18 - 摘要：ADC12aluminum alloy was prepared by casting-forging compound forming,which included indirect squeeze casting and forging,and tensile properties and microstructure of the ADC12 alloy in metal mold casting,indirect squeeze casting and forging after indirect squeeze casting were investigated.The results reveal that after indirect squeeze casting,the dendrites in the alloy become fine spherical structure and number of Al-Si eutectic structure is decreased with average grain size of 37.25μm,decreased by 36.51%,and the tensile strength and elongation reach 240 MPa and 1%,improved by about 34.08%and 14.9%,respectively,compared with those of the metal alloy.Compared with squeeze casting,after casting-forging,theα-Al grains in the ADC alloy are refined obviously,and Al-Si eutectic structures can be crushed and uniformly dispersed in the microstructure with average grain size of 37.25μm,decreased by 28.75%.Meanwhile,the tensile strength and elongation reach 287.75 MPa and 4.4%,improved by about 19.8% and 340%,respectively,compared with those of the metal alloy.The fracture modes of the billet prepared by the metal mold casting are characterized by intergranular fractures,whereas,both that of the indirect squeeze casting and forging after indirect squeeze casting are characterized by quasicleavage fractures.However,after forging,the dimples become more shallow and small,and the number of dimple is increased,so the plastic fracture tendency is increased.The fine grain strengthening and the distribution of Al-Si eutectic structures are responsible for improving the strength and elongation of ADC12 aluminum alloy.关键词：Indirect Squeeze Casting;Forging;Casting-Forging Compound Forming;ADC12 Alloy
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发布时间：2023-12-18 - 摘要：Effects of annealing treatment on microstructure and properties of rolled AZ31 magnesium alloy at reduction of 23.7%,30.5% and 36.4%.The results reveal that after annealing treatment,microstructure of magnesium alloy sheet is improved greatly,where the dendtitic structure is converted into equiaxed ones with absence of twin grains as well as clear grain boundary.Micro-hardness of the AZ31 magnesium alloy sheet with annealing treatment is declined obviously,in addition,tensile strength of the sheet is decreased as a result of softening effects of the annealing treatment.关键词：AZ31 Magnesium Alloy;Annealing Treatment;Mechanical Properties
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发布时间：2023-12-18 - 摘要：Using vacuum induction melting and multi-step copper-mould spraying casting,sub-rapid solidification of magnesium alloy containing SiC inoculants was performed.After isothermal annealing treatment,compound effects of cooling rate and inoculant content on the grain size of spraying deposited magnesium ingots were investigated.Experimental results show that microstructure of the copper-mould quenched magnesium alloy exhibits fine particle,which changes into equiaxed grain with polygon morphology after solid solution at 400 ℃for 2h.Cooling rate is enhanced with decreasing the inner diameter of copper-mould,resulting in the increase of effective nucleation fraction with uniform distribution and decrease of grain size.With addition of 2% SiC and inner diameter of 4mm,the minimum grain size reaches 4μm,and whole fine grain casting can be realized.关键词：Magnesium Alloys;Cooling Rate;SiC Inoculants;Grain Size
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发布时间：2023-12-18 - 摘要：Aiming at some problems in investment casting thin-walled oil tank conncting tube,such as long production period and low mechanical properties,SLS was adopted to directly prepare the whole sand mold/sand core to eleminate surface roughness,high error in abnormal curture face size and misrun as a result of sand core dislocation.The complicated curvature face oil tand connecting tube was produced by low pressure casting,which have the features of high metallurigical quality and geometric size and Ra 6.3μm and size precision of CT6CT8as well as the mininum thin wall-thickness of 1.2mm.关键词：Rapid Casting;SLS Molding Sand（Core）;Thin-walled Comporents
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发布时间：2023-12-18 - 摘要：The ternary alloy of Ni-28.5Al-43 V was prepared sucessfully by vacuum non-consumable arc melting.The microstructure and mechanical behavior of alloy solidified at various locations were investigated by using optical microscope（OM）,X-ray diffraction（XRD）as well as scanning electron microscope（SEM）.The results show that the solidified microstructure of the ternary alloy Ni-28.5Al-43 Vis mainly composed of the V primary phases and NiAl+V lamellar eutectic phase.Meanwhile,microhardness of the ternary alloy was measured.The results show that micro-hardness of the V primary phases reaches 398425,which is three times of that of pure vanadium,which is attributed to the solid solution strengthening effects of V phase.Moreover,compressive strength at high temperature and ambient ductility toughness of the alloy are superior greatly to NiAl alloy,showing V additions remarkably improving the room-temperature plasticity and elevated temperature strength of the Ni-28.5Al-43 Valloy.关键词：Ternary Alloy Ni-Al-V;Preferred Phase;Microhardness;Compressive Properties
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发布时间：2023-12-18
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