最新刊期
卷 29 ， 期 10 ， 2009
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- 摘要：Cu60Ti（10+x）Fe（30-x）（x=0, 20, 25） amorphous alloy with about 4 mm in diameter and 80 mm in length was prepared by suction pouring forming in electric arc furnace with water cooled copper crucible. The as-cast structure of the prepared alloy was characterized by XRD （X-ray diffraction） and SEM （scanning electron microscope） and OM （optical microscope）. The results reveal that the as-cast structure of Cu60Ti10Fe30 is composed of Cu crystal with fcc structure, while Cu60Ti35Fe5 alloy is mainly composed of amorphous phase with a little dendritic nano-crystal phase, and Cu60Ti30Fe10 alloy exhibits absolutely amorphous structure with little granular nanocrystal.关键词：Bulk Amorphous Alloy;Cu Matrix;Nanocrystal
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发布时间：2023-12-18 - 摘要：The boron carbide ceramics were prepared with carbon carbide as matrix and Al2O3, La2O3, Y2O3 and active carbon as sintering agent by vacuum heat pressure sintering. Effects of the rare-earth oxide on microstructure and mechanical properties of the ceramics were investigated. The results reveal that boron carbide ceramics with compact grain structure and desirable properties can be prepared with adding rare-earth oxide and sintering at 1850℃. The prepared samples with rare-earth oxide-free exhibit low properties as a result of a little generation of new phase Al8B4C7 and inadequate sintering, while the samples with La2O3 exhibits a better properties and a desirable structure as a result of more fully sintering and amounts of generation of LaAlO3 phase, meanwhile, the properties of samples with Y2O3 where trace residual Al2O3 and C exist are in range of above two due to low Y3Al5O12 generation.关键词：Boron Carbide Ceramics;Vacuum Heat Pressure Sintering;RE Oxide;Sintering Agent
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发布时间：2023-12-18 - 摘要：Effects of different Nd additions, such as 0.4%, 0.8% and 1.2%, on microstructure and mechanical properties of Mg-Zn alloy were investigated by observing microstructure, measuring average diameter of the grain size and testing hardness and tensile strength. The results reveal that the finest grain size and desirable mechanical properties can be observed in the Mg-Zn alloy with 1.2% Nd addition, in which the average grain diameters are decreased from 145 μm to 42 μm, and hardness （HB）, elongation and tensile strength are increased from 76 to 87, from 5.3% to 9.3% and from 149 MPa to 169 MPa, respectively.关键词：Mg-Zn Alloy;Nd;Grain Refinement
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发布时间：2023-12-18 -
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- 摘要：The flow stress characteristics of the commercial Al-Zn-Mg-Cu-Zr alloy were analyzed by isothermal compression at 300450℃ and strain rate of 0.0110 s-1 with the Gleeble-1500 hot simulator. The results reveal that the flow stress is controlled by strain rate and deformation temperature, where the flow stress is increased with increasing in strain rate and it is decreased with increasing in temperature. The flow stress is firstly increased to a peak value and then tends to be constant at strain rates less than 10 s-1 with increasing in strain, showing dynamic recovery, while it is decreased after a peak value with the increase of strain at astrain rate of 10 s-1 and deformation temperature higher than 350℃, exhibiting partial dynamic re-crystallization. The strain hardening exponent n and deformation activation energy Q were calculated by linear regression method. And the flow stress constitutive equation of the alloy during hot deformation is presented.关键词：Al-Zn-Mg-Cu-Zr （7055） Alloy;Hot Compression Deformation;Constitutive Equation;Deformation Activation Energy
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发布时间：2023-12-18 - 摘要：Effects of yttrium on the ignition-proof, microstructure and mechanical properties of AZ61 magnesium alloy were investigated. The results indicate that proper Y addition can increase the ignition point and improve the mechanical properties of the alloy as a result in improvement of the structure and refinement of the grain size. The ignition point of the alloy is increased from 556℃ to 595℃ with 1.5% yttrium addition, increased by 39℃, exhibiting the desirable ignition-proof role, while with 1% yttrium addition, the ignition point is increased from 556℃ to 592℃ , increased by 36℃, showing acceptable ignition-proof effects, meanwhile, desirable grain refinement in the alloy can be observedv and tensile strength and elongation are increased by 13.5% and 17.8%, respectively, compared with that of AZ61 matrix alloy, exhibiting the optimal mechanical properties.关键词：Ignition-proof;Ignition Point;Microstructure;Mechanical Properties;Tensile Strength;Elongation
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发布时间：2023-12-18 - 摘要：Sn-32Pb-52Bi alloy was used to simulate the molten steel for static thermal simulation experiments to understand effects of varied liquid level and varied power on meniscus shape in mold of main frequency soft-contact electromagnetic continuous casting for round billets with 1500Hz. The results reveal that main frequency magnetic field can more easily pass the slit of segment mold to exert on the liquid metal due to the more strong penetration capability than that of high frequency magnetic field, There fore compared with that in high frequency magnetic field with high power, meniscus height can be generated in the main frequency magnetic field with low power. Meniscus height is increased with increasing in power, which aggravates the fluctuation of surface of liquid metal. Coil position should be set nearby the top of mold as possible, which is beneficial for the enlargement of meniscus shape and improvement of meniscus stability. In addition, pouring surface of liquid metal should be controlled as possible below the center of coil height during producing billets.关键词：Main Frequency Electromagnetic Field;Soft-contact;Mold;Meniscus;Fluctuation
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发布时间：2023-12-18 - 摘要：Microstructure and phase constituent of Mg-RE（Nd, Y）-0.48Zn-0.52Zr alloy were analyzed by OM （optical microscope）, SEM （scanning electron microscope） and XRD （X-ray diffraction）. Meanwhile, the mechanical properties at room temperature and at high temperature of two kinds of as-extruded samples were tested, and they were compared with those of extrusion +T5 heat treated ones. The results show that tensile strength of Mg-RE（Nd）-0.48Zn-0.52Zr reaches 79MPa at 300℃ while tensile strength of Mg-RE（Y）-0.48Zn-0.52Zr reaches 202.53MPa at 330℃. The Y element plays the obvious role in improving elevated tensile strength of the alloy.
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发布时间：2023-12-18 - 摘要：ZrO2-based composite film containing Ca and P was prepared on the surface of pure Zr by micro-arc oxidation （MAO） under constant anode voltages. The thickness, morphology, phase constituent and Ca, P contents in surface of the film investigated with anode voltages of 300 V, 350V and 400V. The results reveal that MAO zirconia films exhibiting porous structure is mainly composed of tetragonal zirconia （t-ZrO2） and monoclinal zirconia （m-ZrO2） containing Ca and P, in which contents of P and Ca in the pore are lower than those on the film surface and along the pore edge. With increasing in anode voltage, the thickness of film, the aperture of pore and the t-ZrO2 content are increased, while the m-ZrO2 phase is slightly decreased. In addition, on the surface of film, the Ca and P contents are increased, and the increase of Ca content is obviously faster than that of P content, resulting in the increase of Ca via P ratio.关键词：Zr;Micro-arc Oxidation;ZrO2 Film;Anode Voltage
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发布时间：2023-12-18 - 摘要：Cu cladding aluminum wire with different diameters was prepared by static hydraulic extruding and drawing-pulling continuous casting Cu cladding aluminum billets. The prepared wire has the features of smooth surface and indentation free as well as crack free. Microstructure and properties of bars, extruded products and drawing-pulled products were investigated. The results indicate that, with a given Cu cladding Al ratio, the grain size in the extruded-drawn-pulled wire is further refined, and absence of intermetallic compound in interface of Cu and Al can be observed, meanwhile, the appearance , electric conductivity and mechanical properties of the prepared wire can meet the national standards, realizing the set goal of processing design.关键词：Static Hydraulic Extrusion;Drawing-pulling Technology;Cu Cladding Aluminum Wire;Composites
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发布时间：2023-12-18 -
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- 摘要：Thixo-forging SiCP/AZ61 composites intermediate shaft screw plug was simulated by the Deform-3D software to understand the flow behavior of the composites melt, especially effects of punch velocity and SiC particle volumetric fraction on thixo-forging process. The results show that, with the same forming processes, the equivalent stress of the SiCP/AZ61 composites intermediate shaft screw plug for the automobile is increased with increasing in SiC particle volumetric fraction, and with the increase of punch velocity, the equivalent stress is greatly increased with more uniform distribution. The thixo-forging experiment was conducted also.关键词：SiCP/AZ61 Composites;Semi-solid;Thixo-forging;FEM （Finite Element Method）
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发布时间：2023-12-18 - 摘要：Influences of the curve numbers in a serpentine channel and pouring temperature on the microstructure of semi-solid A356 alloy slurry were investigated. With increasing in curve numbers in a serpentine channel, the microstructure of the semi-solid A356 aluminum alloy slurry becomes more and more desirable; however, the serpentine channel is easily blocked up with slurry. Desirable spheroidized structure in prepared semi-solid A356 aluminum alloy slurry can be observed with 13 curves in the serpentine channel at the other given parameters. In addition, with decreasing in pouring temperature, structure in the prepared slurry becomes more and more desirable. Acceptable spheroidized structure in the prepared A356 alloy slurry can be obtained with pouring at 640680℃.关键词：Serpentine Channel;Semi-solid;A356 Alloy;Microstructure
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发布时间：2023-12-18 - 摘要：AC4CH alloy castings were produced by squeezing casting, and effects of casting pressure, filling velocity and filling distance on microstructure and properties of the castings were investigated. Microstructure of the squeezed AC4CH parts is composed of α-Al phase and eutectic Si phase, and the grain size in the microstructure is obviously refined with increasing in filling distance. With increasing in filling pressure and filling velocity, eutectic Si phase is decreased with more uniform distribution, and the tensile strength and yield strength of the parts are greatly improved, however, tensile strength is increased slowly wien the filling pressure exceeds a critical value.关键词：Aluminum Alloy;AC4CH Alloy;Squeezing Casting;Filling Pressure;Filling Velocity
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- 173
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发布时间：2023-12-18 - 摘要：Effects of die casting machine, die casting die structure and processing parameters on quality of die castings were described, and countermeasures were presented. It is pointed out that un-qualified hydraulic unite can affect the performance of die casting machine due to resulting in the oil-leakage of the machine and inside-leakage of hydraulic system. The conventional mould with divided mould frame and clamping plate is feasible for the mechanism with slide free. Howeser for the mechanism with slide, especially larger slide, amould frame should be designed to the whole structure. The acceptable preheating temperature for the die and melting temperature as well as pouring temperature are in range of 150180℃, 700720℃, 650680℃, respectively. The die casting aluminum alloy parts with thick wall should select a lower melting temperature, a higher pressure-increment and a more near fast injection stroke, while thin-walled parts should select a higher melting temperature and a lower pressure-increment and a longer fast injection stroke.关键词：Die Casting Machine;Die Casting Die;Processing Parameters
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发布时间：2023-12-18 - 摘要：The mold filling and gas entrapment were simulated by a software to predict the forming location of porosities in a practical die castings. Furthermore, macrostructure and microstructure of local section were observed by OM （optical microscope）, which were compared with simulated results. It is found that the porosities are not only dependent on gas entrapment but also on early solidification of gates and pressure transfer in the solidification process.关键词：Die Castings;Numerical Simulation;Gas Entrapment
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发布时间：2023-12-18 - 摘要：Effects of Si, Ca and Ce mixed addition on high cycles fatigue properties of die cast magnesium alloy AZ91D were investigated at the stress ratio of 0.1 and the number of cycles to failure of 107. It is found that the grain size in microstructure of the alloys is refined with the Si, Ca mixed addition or Ce, Ca mixed addition, in which Mg2Si phase and Al11Ce3 phase appear and absence of phase containing Ca can be observed. The tensile strength of the alloy with Si, Ca mixed addition or Ce and Ca mixed addition is greatly improved, however, elongation exhibits slight change. The maximum fatigue strength of 83.5MPa in the alloy can be obtained with 1.0% Ce and 0.4% Ca mixed addition. The fracture morphology of the alloy with Si and Ca mixed addition or Ce and Ca mixed addition are characterized by dimple-brittle mixed fracture.关键词：Die Casting;Magnesium Alloy;Si;Ca;Ce;Fatigue Properties
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发布时间：2023-12-18 - 摘要：Production process of upper body of oil pan in new type engine was analyzed, and mould structure design was optimized with the help of CAE. The melting processing parameters are as follows: density of liquid aluminum alloy more than 2.65 g/cm3, pouring temperature keeping （760±20） ℃, refining for 46 min at 0.20.3MPa with N2. Hot working tool steel W302 from the Sweden is selected as the die casting die materials, and stress-removal is performed to the mould at 3 000 times and 20 000 times. Vacuum system is assembled at the end of mold filling to ensure the compact structure. Based on project area, injection specific pressure and batches requirements, the 12 000 kN die casting machine with manipulator, automatic spraying-coating system and quantitative system is adopted. The product with excellent quality can be produced through strictly controlling melting process, die casting die and selecting die casting machine.关键词：Oil Pan;Melting;Die Casting Die;Die Casting Machine
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发布时间：2023-12-18 - 摘要：Shrinkage （hole）porosity and misrun often occur in the investment casting missile engine blade. The above mentioned defects can be eliminated by pressurized vacuum suction casting method. In addition, the technology exhibits the more obvious effects in producing complicated thin-walled aluminum alloy components and large investment castings due to its better filling capacity, greatly improving the microstructure and mechanical properties of the missile engine blade.关键词：Casting Defects;Thin-walled Component;Pressurization;Vacuum Suction Casting
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发布时间：2023-12-18 - 摘要：Some complex characteristics increased the difficulty of modeling and control for the secondary cooling in continuous casting process such as the large non-leaner, time-varying parameters and large time delay. In order to overcome the problems, on-line control method to secondary cooling zone was presented based on case-based reasoning technology. The controlling effects were compared with different methods to secondary cooling water in the billet continuous caster from plants, in which heat transfer model verified by practical production was used to simulate continuous casting process. The results show that the control effects of the case-based reasoning method is greatly superior to that of experiment model, verifying the effectiveness of the case-based reasoning model.关键词：Billet;Dynamic Control;Heat Transfer;Secondary Cooling
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发布时间：2023-12-18 - 摘要：Residual foaming agent content and water content are the dominant factors influencing surface roughness of the pattern. Through extending drying time of bead and forming steam time, increasing steam pressure as well as decreasing water cooling time, water content in the pattern can be dropped, and pattern with smooth surface can be observed. However, bead is collapsed with excessive drying time and steaming time and excessive short water cooling time as well as excessive high foaming pressure, resulting in the increase of surface roughness due to the formation of wrinkle as a result of surface collapse of pattern.关键词：EPC Pattern;Surface Roughness;Foaming Agent
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发布时间：2023-12-18 - 摘要：Microstructure of AlFeCuCoNiCrTix （atom weight, x=0.5, 1.0, 1.5） high entropy alloys was observed, and electrochemical behavior of the high entropy alloy was examined and compared with that of commercial 304 stainless steel in o.5 mol H2SO4 solution and 1 mol NaCl solution. The results reveal that the AlFeCuCoNiCrTix （atom weight, x=0.5, 1.0, 1.5） high entropy alloys is mainly composed of fcc structure and bcc structure. Polarization curves show that compared with that of 304 stainless steel, the alloys exhibits lower corrosion rate in 0.5 mol H2SO4 solution, however the pitting corrosion resistance is superior to that of 304 stainless steel in 1 mol NaCl solution.关键词：AlFeCuCoNiCrTix High Entropy Alloys;Microstructure;Electrochemical Behavior
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发布时间：2023-12-18 - 摘要：Zn, Ti, Cd, Sb elements in ZL107 alloy were designed by orthogonal experiment. The optimized alloy compositions were determined by measuring mechanical properties of aluminum alloy samples. The desirable tensile strength and elongation of the alloy reach 356.1MPa, 3.02%, respectively, compared with those of ZL107 alloy after T5 heat treatment, improved by 46% and 52%, respectively. It is shown that the improved ZL107 can be applied to the production of large-scale, complicated and high-strength castings.关键词：Orthogonal Testing;ZL107 Alloy;Trace Element;Mechanical Properties
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发布时间：2023-12-18 - 摘要：There exist oxide inclusions and flux inclusions, shrinkage hole, cold shut, low current efficiency and low open circuit potential, high cost, low efficiency in the melting-casting process of huge tonnage high potential as-cast magnesium anodes used for cathodic protection of drilling platform and drilling stem working in the deep ocean environment. Through adopting smelting crude magnesium directly to magnesium anode process and layered heating furnace during melt purification, controlling the pouring velocity by low pressure transferring liquid metal into distributor as well as designing rational gating-feeding system and mould structure, the sound as-cast magnesium anode was produced successfully, and the electro-chemical properties of the anode meets the ASTM standards with the stable performance.关键词：Cast Magnesium Anode;Melt Purification;Low Pressure Transferring;Huge Tonnage Magnesium Anode
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发布时间：2023-12-18 - 摘要：The specific heat capacity, thermal conductivity, thermal diffusivity and linear expansion coefficient of Mg-10Gd-3Y-0.5Zr （GW103） and Mg-12Gd-3Y-0.5Zr （GW123） alloys were measured at different temperatures. The results reveal that at a given temperature, the specific heat capacity of GW103 alloy is higher than that of GW123. With the temperature below 200℃, the thermal conductivity of the GW103 alloy is more than that of the GW123 alloy, while with the temperature more than 200℃, that of GW123 alloy is higher. With increasing in temperature, the thermal diffusivity of the GW103 alloy is always higher than that of GW123 alloy. In addition, at a given temperature, the linear expansion coefficient is lower than that of GW123 alloy. The chemical composition and high temperature transformation of phase in the alloys are closely related to the thermal-physical properties of the alloys.关键词：Mg-Gd-Y-Zr Alloy;Specific Heat Capacity;Thermal Conductivity;Thermal Diffusivity;Linear Expansion Coefficient;Magnesium Alloy
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发布时间：2023-12-18 - 摘要：As-cast microstructure, mechanical properties and fracture morphology of Al-1.4Cu-1.4Mg-0.6Mn-0.14Zr alloy prepared by direct chilling continuous casting （DCC） and soft-contact electromagnetic continuous casting （EMC）, respectively, were comparatively analyzed. The results show that compared to direct chilling continuous casting aluminum alloy ingot, the soft-contact electromagnetic continuous casting one exhibits desirable surface quality and uniformly fine microstructure, and its tensile strength, yield strength and elongation are improved by 8.3%, 5.1% and 17.6%, respectively. T4 treated aluminum bar was produced by extruding the ingot with extruding ratio of 5∶1 and then solid solution treatment plus natural aging for 96 hours. Effects of solution time on microstructure, mechanical properties and fracture morphology of the extruded aluminum bar were investigated at a fixed aging parameters. The results indicate that, with increasing in solution time, the strength of the aluminum alloy is increased gradually. The alloy with solution for 60 min exhibits desirable comprehensive properties, where tensile strength and elongation reach 538MPa and 23.3%, respectively, however, with extending solution time to 90 min, the plasticity of the alloy is deteriorated.关键词：Electromagnetic Continuous Casting;Aluminum Alloy;Squeezing Casting;Solution Time
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发布时间：2023-12-18 - 摘要：Effects of trace gallium （0.02%0.06%） on microstructure and tensile strength of A356 alloys were investigated. The results show that ambient tensile strength of homogenized annealed A356 alloy has been slightly affected while elevated tensile strength is increased by 14.5%, meanwhile, elongation is greatly decreased with increasing in Ga addition to 0.06%. Ambient tensile strength of the T6 treated A356 alloy with slightly decreasing in elongation is somewhat improved, however, elevated tensile strength is greatly improved, and elongation is obviously decreased with Ga addition.关键词：Ga;A356 Alloy;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：Microstructure and mechanical properties of as-cast and solid solution-aged ZW21 magnesium alloy were investigated by OM （optical microscope）, SEM （scanning electron microscope）, XRD （X-ray diffraction） and WDW-100D electronic universal materials testing machine. The results indicate that the alloy with aging at 250℃ after solid solution at 525 ℃ for 4 hours, with extending aging time, the secondary phase which is not completely dissolved into the alloy, can gradually be gathered into the crystal to form the rosette-like structure. Moreover, with aging for 24 hours, tensile strength and elongation of the alloys reach 243 MPa and 23.75%, respectively, greatly superior to those of as-cast ZW21 magnesium alloy.关键词：ZW21 Magnesium Alloy;Heat Treatment;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：Effects of B addition on morphology and phase constituent of Zr in the aluminum alloy and its working mechanism were described. The results reveal that some Zr is converted from solid solution phase into fine secondary platelet existing in grain and on grain boundary with B addition, which is beneficial for the improvement of electric conductivity of the A356 alloy by reducing the lattice distortion and improving the orderly degree of Al matrix.关键词：B;Zr;Aluminum Alloy;Microstructure;Electric Conductivity
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发布时间：2023-12-18 - 摘要：Effects of B, Ti, Zr composite modification and melt holding time on as-cast microstructure and mechanical properties of permanent mold casting lead brass ZCuZn40Pb2 were investigated by OM （optical microscope） and SEM （scanning electron microscope） and tensile testing. The results reveal that B, Ti, Zr composite modification can refine as-cast microstructure and improve mechanical properties of the lead brass by improving the distribution of α phase and β phase in the as-cast structure. The desirable refining effects can be observed with 0.001% B, 0.02%Ti and 0.01%Zr composite addition. With increasing in holding time, structure becomes coarse in the composite modified lead brass, exhibiting modification fading, however, acceptable refining effects and mechanical properties can be obtained with holding less than 90 min.
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发布时间：2023-12-18 - 摘要：We have developed an ultrasonic atomizing equipment to have successfully prepared Sn3Ag2.8Cu lead free solder powder. The microstructure of the powders at different atomizing medium is compared with that of the conventional alloy, and a type of optimized powder is selected to compare its solderability with that of the conventional alloy. The results reveal that the solidification rate of nitrogen atomized powder is faster than that of air atomized one. The microstructure of atomized powder with finer grain size is composed of polygonal Cu6Sn5 and granular Ag3Sn IMC （intermetallic compound） which are distributed dispersively in the matrix. The IMC of the powder with Cu substrate is more irregular , and the interface between diffusion layer and Cu substrate is more blurry than that of conventional alloy with Cu substrate. In addition, the creep rupture life of the atomized powder is greatly improved compared with the conventional alloy. So the comprehensive properties of the Sn3Ag2.8Cu lead free solder powder is distinctly superior to that of the conventional alloy.关键词：Sn-Ag-Cu Lead-free Solder Powder;Rapidly Solidification;Atomizing Medium;Microstructure;Solder Behavior
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发布时间：2023-12-18 -
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- 摘要：In-situ Al-7Si/TiB2 composites were synthesized by mixed salt reaction method. The microstructure and wear behavior of the prepared composites were analyzed by XRD （X-ray diffraction）, SEM （scanning electron microscope） and EDS（ energy dispersive spectrometer） as well as wear-friction testing. The results reveal that in-situ TiB2 particle with average size of approximately 400 nm is uniformly distributed in the matrix, which exhibits desirable refining effects on primary Al phase and eutectic Si phase. The wear behavior of the composites is greatly superior to that of the matrix, which is attributed to the formation of a compact mechanical mixture layer on the surface of the composites. In addition, TiB2 particles exhibit coupling effects of inhibiting metal flow and bearing some load in process of friction.关键词：In-situ;Aluminum Matrix Composites;TiB2 Particulates;Microstructure;Wear Resistance
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发布时间：2023-12-18 -
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