最新刊期
卷 35 ， 期 9 ， 2015
- 摘要：In-situ Mg2Si/Al composites were prepared by common gravity casting.Microstructure and mechanical properties of Mg2Si/Al composites contained La were investigated by SEM（scanning electron microscopy）and OM（optical microscopy）,tensile testing.The results indicate that effects of La on the microstructure of Mg2Si/Al alloy composites can be observed,and Mg2 Si particles treated by La in the composites is refiend which is attributed to Al11La3 phase formed by interaction between La and Al inhibiting Mg2 Si phase growth.The mechanical properties of the composites with La addition can be improved,where the maximum tensile strength and elongation of the composites reach 108 MPa and2.56%,respectively.关键词：Mg2Si;Composites;Rare Earth;Mechanical Properties
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发布时间：2023-12-18 - 摘要：Purified magnesium sacrificial anode was prepared by using short flow process of smelting crud magnesium directly.The filter was set in the reduction pot to reduce the impurity content in the magnesium silico-thermic process.Low pressure transferring method and layered heating furnace refining method were adopted to purify the magnesium melt,and the melt purifying mechanism was described.It is shown that the filter can capture directly the oxide in the impurities to decrease the content of Ni,Si,Fe.Meanwhile,temperature gradient was established to make Al crystallization ahead of Mg to decrease Al content in the crude magnesium during the magnesium silico-thermic process.Additionally,the inclusions in the melt were decreased sharply by using low pressure transferring method and layered heating furnace refining method.The electro-chemical properties test results reveal that both current efficiency and open potential performance are better than those of the magnesium sacrificial anode standard.关键词：Magnesium Silico-thermic Process;Electrochemical Properties;Impurities Content;Inclusion
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发布时间：2023-12-18 - 摘要：The water-soluble core was prepared with quartz sand,potassium carbonate and bentonite by hot-tamping method.Effects of bentonite addition on properties of the water-soluble core were investigated.The results show that bentonite can enhance obviously the tensile strength of the core and reduce slightly the relative amount of moisture absorption as well as increasing the gas evolution,however,effects on the water soluble time can be ignored.The microstructure and fracture morphology of the core were analyzed by scanning electron microscopy（SEM）,and the mechanism of bentonite improving properties of the water-soluble core was discussed.关键词：Water-soluble Core;Bentonite;Tensile Strength;Relative Amount of Moisture Absorption
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发布时间：2023-12-18 - 摘要：Nickel-based alloy powder was cladded by fiber laser cladding on the surface of 45 steel samples in order to understand effects of laser cladding on microstructure and properties of the 45 steel samples by using optical metallurgical microscope,micro-hardness tester and X-ray diffractometer.The results show that the width,height and thickness of cladding layer are increased with the increase of laser power at fixed other parameters.Meanwhile,the microstructure of cladding layer is coarse and the interface between cladding layer and substrate exhibits irregular.The main phases are composed ofλ-（Fe,Ni）、Cr23C6、Cr7C3、WC and FeMo.The cell microstructure is refined and distributed uniformly with tending to straight interface with the increase of cladding speed.The maximum microhardness reaches 550（HV0.1）,which appears at the distance of 0.5mm from surface to the bonding zone.关键词：Laser Cladding;Microstructure;Micro-Hardness
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发布时间：2023-12-18 - 摘要：The microstructures,age hardening and mechanical properties of Mg-10Gd-3Y-0.6Zr-1Ag alloy were analyzed by SEM,XRD,hardness testing and tensile testing.The results show that as-cast structure of the alloy consists mainly ofα-Mg matrix,Mg24（GdY）5,Mg3 Gd,Mg2Gd and Mg5 Gd phases.The Ag element is dissolved homogeneously in matrix with absence of formed compounds.The aging curves of Mg-Gd-Y-Zr-Ag alloy indicate that the alloy exhibits obvious age hardening characteristics,and peak aging time of alloy is shortened,however,effect on hardness of alloy can be ignored with 1% Ag addition.The optimized aging process parameters of alloy are presented by characteristic curve.The strength of T6 heat treatment alloy is obviously improved.However,Ag element addition is not obvious related with mechanical properties of the as-cast and heat treatment alloy at room temperature.关键词：Magnesium Alloy;Solution Treatment;Age Hardening;Microstructures;Mechanical Properties
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发布时间：2023-12-18 - 摘要：Effects of boron content on the high-temperature oxidation resistance of high-boron austenite steels at 850 ℃ were investigated by oxidation weight increase method,and microstructure and phase constituent of oxide products were analyzed by SEM and XRD.The experimental results show that the boron can increase high-temperature oxidation resistance of the tested steels through forming compact oxidized film.The high-temperature oxidation resistance properties after adding boron is increased from grade 4to grade 2according to the oxidation resistance standard in GB/T 13303-1991,much better than grade 5of ESR-H13 steel for comparison.关键词：Boron;Austenite Steel;Oxidation Resistance Property
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发布时间：2023-12-18 - 摘要：Based on the ABAQUS/Explicit software,a 3Delastic-plastic coupled thermo-mechanical FE（finite element）model of hot radial-axial rolling of AZ31 magnesium alloy was established to analyze influence of idle roll diameter on the non-uniform distribution of strain and temperature,rolling force and power parameters.The results show that with idle roll diameter increase,the strain distribution and the temperature distribution of the rolled ring become more homogeneous,meanwhile,the rolling force and rolling moment of radial direction are gradually increased with the increase at idle roll diameter,however,rolling moment at axial direction is decreased gradually.关键词：Idle Roll Diameter;AZ31Magnesium Alloy;FEM;Radial-axial Rolling
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发布时间：2023-12-18 - 摘要：Recent research progress of long-period stacking ordered（LPSO）phase in magnesium alloys were reviewed,and various types of LPSO phase in magnesium alloys and its generation mechanism as well as influencing were described systematically,focusing on generation mechanism of LPSO phase in Mg-Nd-Zn alloys.Finally,the four development trend of spray deposition magnesium alloys modified by high-alloying Ca and Nd was proposed.关键词：Sprayed Deposition;Magnesium Alloy;Long-period Stacking Ordered（LPSO）;Calcium and Neodymium;High-alloying
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发布时间：2023-12-18 - 摘要：The hot deformation behavior of 6082 aluminum alloy at 350500℃and 0.015.00s-1 was analyzed by using hot compression testing on a Gleeble-1500 simulator,and the constitutive equation of6082 aluminum alloy was presented by means of fitting experimental data.The precision forging process of the 6082 aluminum alloy heat sink was simulated using Deform-3Dsoftware and the forming laws.The feasibility of numerical simulation was verified by trial production,which provided some references for engineering application.关键词：6082Aluminum Alloy Heat Sink;Constitutive Equation;Deform-3DSoftware;Precision Forg-ing Process;Numerical Simulation
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发布时间：2023-12-18 - 摘要：According to flow stress-strain curves of AZ31 magnesium alloy,the material model of AZ31 magnesium alloy was established,and the backward extrusion process of AZ31 magnesium alloy thinwall tubes was simulated by the Deform-3Dsoftware.The distribution of temperature field,damage factor and velocity of internal billet and tube were analyzed in extrusion process.Effects of extrusion temperature,extrusion speed and die angle on peak temperature,effective stress,velocity and maximum extrusion force were discussed.The results show that the optimized technological parameters such as extrusion temperature,extrusion speed and die angle of backward extrusion AZ31 magnesium alloy thinwall tubes reach 310 ℃,1mm/s and 60°,respectively.关键词：AZ31Magnesium Alloy;Thin-wall Tubes;Backward Extrusion;Finite Element Modeling
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发布时间：2023-12-18 - 摘要：Semi-solid A356 aluminum alloy melt was prepared by electromagnetic stirring process,and influences of processing parameters on solid fraction and shape factor of semi-solid A356 aluminum alloy melt were investigated by orthogonal experiment method.The results show that factors influencing solid fraction is presented as follows:holding temperature,output voltage and then frequency;factors affecting shape factor is output voltage,stirring frequency and then holding temperature.With the increase of holding temperature,the solid fraction is decreased,while with the increase of output voltage and stirring frequency,the shape factor tends to 1,which means the grain morphology closed to being spherical.关键词：Electromagnetic Stirring;Semi-solid;A356 Aluminum Alloy Melt;Solid Fraction;Shape Factor
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发布时间：2023-12-18 - 摘要：The TiB2/7075 composites were prepared by in-situ reaction method,and effects of TiB2 on the microstructure of Al matrix composites were investigated.The results reveal that morphology ofα-Al grain can be improved significantly with additions of 4.5%TiB2.However,the optimization effect is decreased with additions of 9%TiB2due to the particles aggregation.The numerical simulation of serpentine tube pouring technique was conducted by ProCAST software to determine the feasibility of the technique and the appropriate serpentine tube temperature,pouring temperature as well as the curve number of tube.It is found that the desirable semi-solid slurry can be prepared with serpentine tube temperature of 400 ℃and pouring temperature of 670℃.Fine globular microstructure can be rheo-extruded successfully according to process parameters obtained by numerical simulation.关键词：7075Alloy;TiB2;Composites;Numerical Simulation;Semi-solid
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发布时间：2023-12-18 - 摘要：Effects of pouring temperature and helix angle in helical curve duct on the microstructures of A356 aluminum alloy semi-solid slurry prepared by helical curve duct were investigated.The results indicate that pouring temperature of alloy melt and helix angle in helical curve duct are related with cooling performance and self-stirring blend degree.At fixed other structural parameters of helical curve duct and process parameters,the excellent semi-solid slurries of A356 aluminum alloy can be prepared under reasonable pouring temperature combining with certain specific helix angle in helical curve.关键词：Helical Curve Duct;Slurry Preparation;Microstructure
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发布时间：2023-12-18 - 摘要：The rotating-rod induced nucleation（RRIN）was adopted to fabricate semi-solid slurry of Al-25 Si alloy.The influence of pouring temperature on microstructure of Al-25 Si aluminum alloy semi-solid slurry was analyzed,and the refining mechanism of microstructure was expounded based on to the motion of melt on the surface of rotating-rod.The results show that a melt film with the largest spreading area and the thinnest thickness on the rod surface can be obtained shortly,and fine sized primary Si particles evenly distributed in the matrix can be observed with the pouring temperature approximately 785℃.The equivalent diameter of the primary Si particles is about 27μm with shape factor of 0.8.关键词：High Silicon Aluminum Alloy;Rotating-rod Induced Nucleation（RRIN）;Microstructure re-finement
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发布时间：2023-12-18 - 摘要：The change of Si,Cu distribution in vacuum HPDC Al-Si-Cu alloys samples（50% vacuum degree）with solution treated at different time was observed and analyzed by optical microscope,SEM,EDS,XRD.Results indicate that Si phase in the vacuum HPDC samples with solution treated 2hat 500℃ has satisfied size and distribution morphology and surface blister is less than 100μm.The finer eutectic Si particle can be generated in the vacuum HPDC samples compared with common HPDC samples.After solution treated at 500 ℃for 0.5h,Cu elements are dissolved into matrix partly to be homogenized,then its distribution is related with Si phase change.关键词：Vacuum HPDC;Eutectic Si;Cu;Solution Treatment
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发布时间：2023-12-18 - 摘要：The Magma software was used to predict the gas pressure in vacuum die casting filling process and gas entrapment in vacuum die casting engine cylinder block.Through the microstructure observation,CT scanning,mechanical properties test and density measurement,influences of the vacuum die casting on engine cylinder block casting quality was analyzed to understand effects of density on properties of engine block.The results reveal that the vacuum can reduce the gas pressure inside the cavity during filling process and improve gas entrapment,meanwhile,the vacuum die casting process can reduce the porosity in die castings,improving structure density and the casting properties effectively.关键词：Vacuum Die Casting;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：<正>"第16届巴西圣保罗国际铸造冶金展览会"（FENAF）将于2015年9月28日10月1日在巴西圣保罗北方展览中心举办。FENAF是拉美地区最大的铸造行业展览会,由巴西铸造协会、拉丁美洲铸造协会联合举办,每两年一届,该展得到巴西工业、能源等政府部门的大力支持,同期举办铸造会议、
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发布时间：2023-12-18 - 摘要：Some defects easily occurred in thin walled titanium alloy impeller,such as misrun,coldshut,gas porosity and micro-crack,were analyzed,and processing design was modified.Through adopting the machining graphite model,vertical gate system and centrifugal casting methods,titanium alloy impeller with 180 kg and1 200mm×300mm as well as the minimum wall thickness of 8mm was prepared successfully.In addition,during melting process,the melting voltage is controlled in 3541V when the melting current is more than 20 kA.With spraying ZrO2 on the surface of the graphite mould,roughness of the impeller can be improved and hot crack tendency of surface is decreased.关键词：Titanium Alloy;Impeller;Graphite Mould;Centrifugal Casting
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发布时间：2023-12-18 - 摘要：Numerical simulation was adopted to optimize process parameters of the thick-slab continuous casting mould for molten special steel,and then the optimized process parameters were presented.The numerical simulation of temperature field and flow field was carried out with various superheat and nozzle insert depth in 400mm×2 400 mm billet crystallizer.In addition,on the basis of optimization,influence of casting speed on flow field and temperature field was analyzed.Meanwhile,under the condition of 0.5m/min,thermal stress results were given.With 0.5m/min at over-degree of 20 Kand penetrating depth of 120 mm,it can not only ensure the quality of the casting,but also ensure the production efficiency.关键词：Thick Slab of Special Steel;Mould;Temperature Field;Flow Field;Numerical Simulation
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发布时间：2023-12-18 - 摘要：Effects of mould temperature on microstructure and tensile properties of in situ thixoformed Sip/ZA27 composites were investigated.The results indicate that with the mould temperature increases,the solidification rate of ingot is decreased,and the size and fraction of the primaryα-Al particles are increased.Moreover,Zn conent in the primary particles is increased.In addition,the aggregation tendency of Si particles tends to become serious.Based on tensile properties testing,the optimal mould temperature is 200℃,where the tensile strength and elongation reach up to 382 MPa and 1.17%,respectively.Moreover,the fracture mode of the thixoformed composites is transformed with the mould temperature increase.关键词：Thixoformed;Sip/ZA27Composites;Mould Temperature;Microstructure;Tensile Properties
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发布时间：2023-12-18 - 摘要：SiCp/Cu composites were prepared by the vacuum hot-pressed sintered technology and powder metallurgy method.The thermal conductivity of the composites at room temperature was measured by laser pulse method.The results reveal that that thermal conductivity of the alloy is decreased gradually with the increase of SiCpvolume fraction,especially the volume fraction more than 30% SiCp.The thermal conductivity of the composites is related with internal defects,the mismatch between copper and SiCpparticle as well as interface reaction.In order to prepare composites with good thermal conductivity properties,volume fraction of SiCpparticles should be controlled strictly at 15%to 30%to improve density and reducing the dislocations,voids and other defects.关键词：SiCp/Cu Composite;Powder Metallurgy;Vacuum Hot-pressed Sintered Technology;Thermal Conductivity;Porosity;Interior Defect
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发布时间：2023-12-18 - 摘要：Ti2AlC reinforced titanium aluminide composites were fabricated successfully by in situ hot pressing technique in TiC-Ti-Al-CNTs system.The phase composition,microstructure and mechanical properties of the composites prepared were investigated by XRD and SEM.The results show that CNTs can consume Ti element,which results in different phase composition in the products.For Ti2AlC/TiAl composites,Ti2 AlC reinforcements exhibit particle morphology,and the composite with lower Ti2 AlC content has better comprehensive properties.For Ti2AlC/TiAl3 composites,the structure presents overlap joint lamellar structure,and the flexural strength and fracture toughness reach 290.97 MPa and 5.08MPa·m1/2,respectively,increased by 79.62% and by 154%,compared with those of the TiAl3 alloy.关键词：Intermetallics;Ti2AlC;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：With sodium molybdate and sodium twelve mixed solution as the membrane forming agent,composite film with Cr-free on the 6061 aluminum surface was prepared,and the forming process and microstructure of the composite conversion film were investigated,meanwhile,the formation mechanism of the conversion film was described.The results show that,with increasing in the film formation time,micro-hole in the conversion film surface is covered gradually with uniformly distributed micro-crack,and the width of micro-crack is increased increasingly.Composite conversion coating consists of amorphous oxides and hydroxides,such as MoO3,MoO（OH）2,CeO2,Ce（OH）4,Ce（OH）3,MnO2,Al（OH）3,Al2O3 and possible MoO2.关键词：6061Aluminum Profile;Conversion Coating;Surface Morphology;Mechanism
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发布时间：2023-12-18 - 摘要：Solidification experiments were carried out using ternary alloy Al-4.29Cu-1.09 Mg with three different kinds of materials:graphite,sand,and insulated material.The solidification phase types and morphologies,the hardness,the secondary dendrite arm spacing were investigated by scanning electron microscopy and component analysis.The results show that the grain size and second dendrite arm space of the ingot are decrease,and the hardness is increased with the increase of solidification rate.In the second dendrite arm scale,microsegregation of element Cu and Mg can be observed in the sand mold sample.The solute composition at the edge of the second dendrite arm is higher than that at the center,and the degree of microsegregation of Cu is larger than Mg.关键词：Cooling Rate;Al-Cu-Mg Alloy;Solidification Structure;Microsegregation
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发布时间：2023-12-18 - 摘要：Influences of Sr and Zr on solidified structure and mechanical properties of Mg97Y2Cu1 alloy reinforced by long period ordered structure were investigated.The results show that with 0.1%Sr or0.8% Zr addition,solidified structure can be refined,and mechanical properties of the alloy can be improved,especially combined addition of Sr and Zr.With the combined addition of Sr and Zr,primary phase in the alloy is transformed into fine equiaxed grains or rosette ones with the uniform distribution of the second phase,meanwhile,its volume fraction along grain boundary is increased greatly.The tensile strength and elongation of the alloy reach 222.5MPa and 10.7%,which are increased by up to 29%and84%,respectively,compared with the alloy without treatment.关键词：Long Period Ordered Structure;Sr;Zr;Solidified Structure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：The copper-coated graphite and rare element（Ce）were added into the Al-Mg2 Si matrix alloy,and the graphite-contained aluminum alloy was prepared.The microstructure of the as-casted and solution-aging treatment was observed and the hardness was tested.The wear behavior under different loads and ethanol droplets were evaluated.The results show that the graphite particle is distributed uniformly in the as-cast alloy and the microstructure of the alloy is refined after solution and aging treatment with improvement of the hardness.Under the load of 100 N,20mL/min droplets of ethanol,wear loss of the prepared aluminum exhibits mild.The graphite particles and the ethanol boundary lubricated film affect the graphite-contained aluminum alloy.关键词：Aluminum Alloy;Copper-coated Graphite;Solution and Age Treatment;Wear Behavior
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发布时间：2023-12-18 - 摘要：Influences of Mg-Ce alloy and Ce on the microstructure of Al-5Ti alloy were investigated by SEM and OM.The results show that:Ti-Al phases with strip structure and 50100μm in radial direction and more than 200μm in axial direction are distributed on the substrate of Al-5Ti master alloy.After adding of rare earth 0.3%Ce,the shape of Al-Ti phase nucleation particles is transformed into fine feathery with significant decrease of size to 1050μm and more dispersedly distribution.After adding1% Mg-30 Ce alloy,Al-Ti particles are changed into fine needle particles with axial size and radial dimension of 20μm and 1020μm,respectively.After adding Mg elements,Al-Ti particle size is further reduced and magnesium-rich particles can be observed in interface of Al-Ti phases.Based on the refining effect analysis of Al-5Ti and Al-5Ti-1（Mg-30Ce）,the refining effect of Al-5Ti-1（Mg-30Ce）for Al-Si alloy is significantly superior to that of Al-5Ti alloys.关键词：Al-5Ti Master Alloy;Ce;Mg-30Ce Master Alloy;Microstructure;Refine
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发布时间：2023-12-18 - 摘要：According to the three dimension closed die forging process of aluminum alloy connecting rod,the process was simulated numerically using Deform-3Drigid-plastic finite element software.Effects of three direction movement of punch on the effective stress field,effective strain field,velocity field of material,and forging load in the process were investigated.The simulation results reveal that the concave motion modes is beneficial for the heterogeneous flow of metal and the anti-deformation at different position of connecting rod,taking the satisfied quality and improving the service life of mould,where the forging parts exhibit fully filling with absence of forming defects.关键词：Aluminum Alloy Connecting Rod;Three Dimension Closed Die Forging;Deform-3D;Numeri-cal Simulation;Punch Movement
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发布时间：2023-12-18 - 摘要：The modification effect of rare earth Gd on primary Mg2 Si in hypereutectic Mg-5Si alloy was analyzed,meanwhile,effects of Gd on microstructure and mechanical properties of the alloy were presented,and modification mechanism was described.The results reveal that Gd exhibits desirable modification effects on primary Mg2 Si phase in the hypereutectic Mg-5Si alloy,especially 2.0% Mg-30 Gd addition.The average size of primary Mg2 Si phase can be decreased to less than 25μm,and the morphology of primary Mg2 Si phase is transformed from the coarse dendrite into fine polyhedron particle with more uniform distribution.The tensile strength and elongation of the alloy reach 105 MPa and 3.1%,respectively.However,with the Mg-30 Gd content more than 3.0%,the primary Mg2 Si phase in the hypereutectic Mg-5Si alloy is coarsen again.The refinement of Gd is mainly associated with the enrichment of Gd on the growth facets of the primary Mg2 Si crystals to depress the preferred crystal growth.In addition,intermetallic compound GdxSiycan be taken as heterogeneous nuclei of the primary Mg2 Si phase growth.关键词：Rare Earth Gd;Hypereutectic Mg-5Si Alloy;Primary Mg2Si;Modification Treatment
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发布时间：2023-12-18 - 摘要：Effects of different strength（01.5T）of static magnetic field on solidified structure and crystal orientation of Al-10 Ni alloy were investigated.The results show that the primary Al3 Ni phase is distributed homogeneously in the alloy and orientally aligned at parallel to the direction of the magnetic field.The crystal orientation of Al and Al3 Ni phase can be changed by magnetic field.With the increase of magnetic field intensity,the alignment degree of the Al3 Ni phase is enhanced gradually with the decrease of the space.The crystal plane（311）of Al phase is restrained.The diffraction intensity of the crystal plane（hk0）is enhanced,and the crystal of Al3 Ni phase is oriented with c-axes parallels to the magnetic field.关键词：Static Magnetic;Al-Ni Alloy;Solidified Structure;Crystal Orientation
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发布时间：2023-12-18 - 摘要：The work hardening curve of Cu-Ag alloy is drawn after applying cold deformation.The tensile strength,elongation and microstructure of alloy are respectively tested and observed after annealing.The results show that the alloy shows obvious work hardening effect after cold deformation.The strength of the alloy is increased firstly and then keeps constant as working rate increases.However,the elongation and electrical conductivity exhibit opposite change rule.In addition,the larger the working rate is,the less the recrystallization temperature is.When the deformation is more than 60%,the recrystallization temperature tends to stable（300400 ℃）关键词：Cu-Ag Alloy;Work Hardening;Recrystallization Temperature;Tensile Strength
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发布时间：2023-12-18 - 摘要：<正>20150901 Rahimi B,Khosravi H,Haddad-Sabzevar M.流变铸造2024铝合金微观组织和力学性能研究.International Journal of Minerals,Metallurgy and Materials,2015,22:59-67.目前为止,鲜有关于合金流变铸造工艺和流程方面的研究报道。2024铝合金作为一种以Cu作为主要元素的合金,主要应用于要求高比强度和高抗疲劳性能的工作条件下,如汽车轮毂、飞机零部件、科学设备等。研究了机械搅拌速度和T6热处理对流变铸造2024铝合金微观组织和力学性能的影响。结果
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发布时间：2023-12-18
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