最新刊期
卷 29 ， 期 6 ， 2009
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- 摘要：Eutectic morphologies of as-cast Mg-Al alloys with various aluminum contents were observed by optical microscope（OM）,scanning electron microscope（SEM）,X-ray diffraction（XRD）.The formation mechanism of the eutectic structure and its influential factors were described.The results indicate that β phase is prior to precipitate from the eutectic structure in the Mg-Al alloy.With increasing in aluminum content,eutectic structure in the Mg-Al alloy is converted from divorced eutectoid into granular,and into fibrous,and then to lamellar structure.With increasing in cooling rate,eutectic structure becomes finer and finer,and developed primary α phase can be observed.The eutectic morphologies of Mg-Al alloys in solid solution range is significantly affected by the primary α dendrite morphology.关键词：Mg-Al Alloy;Eutectic Structure;Primary Phase
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发布时间：2023-12-18 - 摘要：Mg2Si and primary Si particle hybrid reinforced Al matrix gradient composites tubes were fabricated by hot mould centrifugal casting,and the raw tubes were machined into the cylinder line with 23 mm particle reinforced layer in thickness in the inner wall.The microstructure of the cylinder liner was observed by SEM（scanning electron microscope）and OM（optical microscope）.The results indicate that volumetric fraction of hybrid particles makes 30%38% in the inner reinforced layer,while absence of hybrid particles in outer layer can be observed.Hardness and abrasion testing show that the reinforced layer exhibits a higher hardness and desirable wear resistance.Primary Si is dominant in subjecting frictional loading,and the Mg2Si phase plays a key role in reinforcing wear resistance.关键词：Cylinder Liner;Centrifugal Casting;Gradient In-situ Composites;Mg2Si Phase
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发布时间：2023-12-18 - 摘要：Melting process of TiAl and NbSi intermetallic alloys in vacuum non-comsumed arc furnace was simulated by the ANSYS software.Through temperature field obtained from melting process,cooling curves and corresponding cooling rate at different positions of the alloy ingot were mapped out.Compared with different cooling rates in simulation,the uniformity of microstructure in relevant positions of actual cast Ti-47Al-2Cr-2Nb and Nb-16Si-22Ti-2Al-2Cr-3Hf alloys was analyzed.The results reveal that the different cooling rates in cast alloys can result in the microstructural heterogeneity,greatly affecting the quality of alloy castings with large dimension,although vacuum non-consumed melting technology is convenient for superalloy.关键词：Vacuum Non-consumed Electric Arc Melting;Temperature Field Simulation;Microstuctural Homogeneity
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发布时间：2023-12-18 -
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- 摘要：Microstructure of as-extruded AZ61 magnesium alloy was observed by optical microscope（OM）,and high strain impacting testing for the alloy was carried out by the Hopkinson bar to map the stress-strain curves at different strain rate.Dynamic stress-strain behavior of the as-extruded alloy was analyzed at high strain rate,and effects of strain rate on yield strength and crack mechanism were described.The results reveal that elastic modulus of the alloy exhibits somewhat change in the whole loading process,while obvious yield point can be observed in tensile testing.With increasing in strain rate,tensile strength of the alloy is increased with decreasing in mestable strain,however,absence of strain rate strengthening effects can be observed.The fracture morphology of the alloy was observed by SEM（scanning electron microscope）.It is found that tensile crack morphology of the as-extruded magnesium alloy is characterized by ductile fracture accompanying with a little cleavage fracture,showing the non-sensitivity for the strain rate.关键词：Magnesium Alloy;Mechanical Behavior;Strain Rate;Fracture
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发布时间：2023-12-18 - 摘要：The closed integration system for melting and pouring magnesium alloy was described in detail,and the microstructure and mechanical properties of the magnesium alloy prepared by conventional techniques and by the new techniques were analyzed.The results reveal that compared with those of the AZ31-0.6Nd alloy prepared by conventional techniques,absorptivity of Nd in the alloy prepared by the new technique which exhibits the integration of melting,treatment and pouring under the condition of closed and continuous process is increased by 55.6%,and microstructure of the alloy is refined with increasing in precipitate as well as the presence of Mg12Nd phase,in addition,the tensile strength,yield strength and elongation of the alloy with Nd and Nd-free are distinctly improved.关键词：Magnesium Alloy;Melting;Pouring;Mechanical Properties
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发布时间：2023-12-18 - 摘要：The semi-solid 6061 aluminum alloy billets with 120 mm in diameters and 1600 mm in length were prepared by near-liquidus semi-continuously casting.Effects of pouring temperature,pulling velocity and cooling rate on microstructure of the ingot were analyzed.The results indicate that the microstructure of ingot poured at 720 ℃ exhibits coarse dendrite with heterogeneous distribution,while that of poured at 657 ℃ exhibits homogeneous fine near-globular structure.The uniform and fine near-globular structure in the ingot can be easily formed with decreasing in firstly cooling rate and then increasing in cooling rate.In addition,the semi-solid 6061 aluminum alloy billets with uniformly fine near-globular structure can be observed with casting velocity of 150 mm/min.Near-liquidus semi-continuously casting is an effective method for preparing 6061 aluminum alloy semi-solid billets.关键词：6061 Aluminum Alloy;Near-Liquidus Semi-Continuous Casting;Semi-solid Billets;Microstructure
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发布时间：2023-12-18 - 摘要：Primary dendritic competitive growth and solute concentration distribution in directional solidification DZ125 superalloy were simulated by cellular automaton coupled with finite differential method（CA-FD）in case of a fixed temperature gradient.The results indicate that the modeling can visualize the microstructural evolution of DZ125 superalloy.A solute concentration gradient of 1%/mm from the bottom to the tip in solidified dendrite exists in mushy zone at the growth rate of 10 μm/s,meanwhile,the liquid solute concentration is decreased from 44.16% at the interface to 38.68% out of the solute diffusion layer.At the growth rate of 100 μm/s,the solute concentration gradient in solidified dendrites becomes smaller,compared with that of ones at 10 μm/s,and its interface liquid concentration makes 51.54%,which is the higher than that of 10 μm/s.The liquid concentration in the dendrites is decreased from the bottom to the top as 20%/mm in mushy zone at 100μm/s,which is well in agreement with that from theoretical analysis’s.关键词：Directional Solidification;DZ125 Superalloy;CA;Solute Concentration Distribution
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发布时间：2023-12-18 - 摘要：Numerical simulation of temperature field and thermal stress field in die casting die for Al alloy wheel was performed by the Procast software in practical product.The position often encountered in crack in practical aluminum alloy wheel was simulated by the software to obtain different variation of thermal stress field with different processing parameters.The optimized processing parameters were presented.The results show that with increasing in pouring temperature,surface thermal stress in crack position at the die is increased.However,with increasing in pre-heating temperature of the die and decreasing in temperature gradient in the die surface,it is decreased.关键词：Aluminum Alloy;Die Casting Die;Temperature Field;Thermal Stress Field;ProCAST Software
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- 407
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发布时间：2023-12-18 - 摘要：Finite element method was employed to simulate the effects of friction on the equal channel angular pressing of single pass for high-strength aluminum alloy.The results indicate that with increasing in frictional coefficient,the deformed loading and applied forces are increased,and heterogeneity of strain in core is more and more serious,however,average equilibrium strain of the alloy remains a basically steady value.Loading-displacement curves are divided into five stages:rapid-increment,stable stage,rapid increment,stable stage and rapid decrement.With increasing in frictional coefficient from 0 to 0.3,the maximum loading is increased by 2.1 times with applied force increased by 1.3 times.So during ECAP,it should be considered that clean inner-wall surface for the mould,rational lubricant agent are included to decrease friction and loading to improve grain size and homogeneity of the microstructure in the alloy.关键词：Friction;High Strength Aluminum Alloy;ECAP;Finite Element Simulation
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发布时间：2023-12-18 - 摘要：According to the equation of materiel balancing,conversation of energy and momentum,the smelting temperature model during aluminum melting process have been proposed.By determining the boundary condition from the data for testing conversation of energy on the basis of the PDF（possible density function）and using hydrodynamics software Fluent 6.3,numerical simulation of the temperature field during aluminum melting process have been conducted.The simulated results are well in agreement with the practical ones.关键词：Aluminum Melting Furnace;Modeling;Temperature Field;Numerical Simulation
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发布时间：2023-12-18 -
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- 摘要：AlSi30 semi-solid billets were fabricated from AlSi30 alloy powder by using ECAP（equal channel angular pressing）method as a substitute for thermal and cold plastic deformation in the SIMA method（strain induced melt activation）based on orthogonal testing,and effects of processing parameters on microstructure of the semi-solid billets were investigated.The results show that the holding temperature is dominant in controlling grain size and spheroidization rate of primary Si phase,and then holding time,then pressing temperature of equal channel angular.The desirable grain size and spheroidization rate of the primary Si in the semi-solid billets can be observed with holding at 605℃ for 55 min and pressing at 500℃ based on A route.关键词：AlSi30 Powder;ECAP Method;SIMA Method;Orthogonal Testing;Semi-solid Billets
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发布时间：2023-12-18 - 摘要：A new type high strength and heat resistant Mg-10Gd-Y-Zr（GW103K）magnesium alloy semi-solid slurry was prepared by the near liquidus casting method,and its microstructure was compared with that prepared by over-liquidus casting method.And the effects of holding time and cooling rate of the mould on the as-cast microstructure of the alloy were investigated in near-liquidus casting method.The results reveal that compared with that prepared by over-liquidus casting,microstructure of the GW103K semi-solid slurry prepared by near-liquidus casting is obviously changed.Near-liquidus casting is beneficial to the spheroidization of grain size in the GW103K containing Zr with obviously increasing in roundness,However,grain size becomes coarse as a result of fusion mechanism.With increasing in holding time,grain size is increased with the great decrease of roundness,while grain boundary is refined due to the reduction of intermetallics distributed along the boundary.With increasing in cooling rate,the grain size in the alloy is refined with the increase of shperoidization.The new type high strength and heat resistant magnesium alloy GW103K slurry with more perfect spheroidized structure can be prepared by near-liquidus casting method by the molten alloy immediately pouring into a high cooling capacity mould at near-liquidus temperature.关键词：Magnesium Alloy;Near Liquidus Casting;Microstructure
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发布时间：2023-12-18 - 摘要：Assembly mould structures with different motion types in squeezing casting have been visualized based on the CAD.The softwares,including the Flash and 3DMAX,were employed to simulate the motion of mould-opening,mould-closing and mould-unloading in squeezing casting,and the movement of mould structure was real-time observed in process of simulation.The simulated results show that the working process of the mould structure can be reproduced directly by the visualization,and problems in design of the mould can be considered early and then can be modified in time,so the accuracy and rationality of the mould structure can be ensured,effectively improving the designing efficiency and reducing the designing cost.关键词：Squeezing Casting;Mould;Motion Simulation
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发布时间：2023-12-18 - 摘要：Production of heavy hollow ring castings by full mold casting was described.The processing procedure was as follows:firstly,top mold and bottom mold were made;secondly,opening the mold and cutting the EPS at closed position and then filling sand;finally,the liquid metal was poured.The surface and inherent quality of the heavy hollow ring were evidently improved by the new full mold casting.
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发布时间：2023-12-18 - 摘要：Liquid copper leakage in practical production was summarized.It was pointed out that the leakage was closely related to the operator,machine,regularity and materials.The possible origination of liquid copper leakage in horizontal continuous casting was described,and countermeasures were presented to prevent the accident.关键词：Horizontal Continuous Casting;Liquid Copper Leakage;Accident;Analysis
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发布时间：2023-12-18 -
- 摘要：Automatic low temperature wax-pattern-making was realized by the employment of production line of low temperature wax full-automatic injection wax.The practical production verifies that the automatic wax pattern-making can effectively improve the qualification rate of pattern-making and production efficiency due to canceling pattern-modification procedure,and it can improve the product condition of pattern-making workshop,decreasing the labor intensity and numbers of the employer.关键词：Full-automatic Pattern-making;Quality Control;Injection Wax Machine
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发布时间：2023-12-18 - 摘要：Effects of Mg on reaction process,morphology and relative density of reaction products in Mg-Al-Ti system were investigated,and the Mg matrix composites were successfully prepared.The results reveal that the Al3Ti phase is dominant in reaction products in Mg-Al-Ti system.Mg element plays a role in decreasing initial temperature and in extending initial time of synthesized reaction of Mg-Al-Ti system.With increasing in Mg content,relative density of reaction products is obviously improved,where the relative density reaches 97.0% with 75% Mg content.In addition,created Al3Ti particles exhibiting round morphology and uniform distribution are refined with Mg addition.As a result,Al3Ti particle reinforced Mg matrix composites with 13 μm of Al3Ti which is relatively uniformly distributed in Mg matrix can be successfully fabricated by in-situ reaction synthesis in Mg-Al-Ti system.关键词：Al-Ti;Mg Matrix Composites;Reactive Synthesis;Microstructure;Relative Density
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发布时间：2023-12-18 - 摘要：Al2O3f/Mg-9Al-0.5Nd composites were prepared by pressureless infiltration method,and microstructure,compressive behavior and fracture morphology of the prepared composites were investigated by SEM（scanning electron microscope）,XRD（X-ray diffraction）and computer servo-material experimental machine.The results show that presence of new Mg2Si phase and a little particle and rod-like RE phase can be observed in the composites.The Mg2Si phase with the slight increase of size is increased in the heat treated composites.The compressive strengthes of the composites after T4 and T6 heat treatment are declined from 346.5 MPa in as-cast ones to 250.5 MPa and 327.5 MPa,respectively.After T6 heat treatment,compressive fracture of the composites is characterized by a mixed fracture instead of quasi-cleavage fracture,meanwhile,a small amount of fiber pulled out from the matrix can be observed.关键词：Magnesium Matrix Composites;Nd;Heat Treatment;Microstructure;Mg2Si Phase;Compressive Behavior
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发布时间：2023-12-18 - 摘要：In-situ Al2O3/TiAl composites were prepared by hot-pressing method based on the exothermic reaction of Ti-Al-TiO2-Nb2O5 system.Effects of Nb2O5 addition on microstructure and mechanical properties of the prepared composites were investigated by SEM（scanning electron microscope）,XRD（X-ray diffraction）.The results indicate that the as-sintered composites consist of γ-TiAl,α2-Ti3Al,Al2O3 phase and NbAl3 phase.With increasing in Nb2O5 content,the density,relative density and hardness of the composites are gradually increased,meanwhile,bending strength and fracture toughness are firstly increased and then decreased,in which the maximum values are 398.5 MPa and 6.99 MPa·m1/2,respectively,with 6% Nb2O5 content.Microstructure analysis shows that,sintered at 1200℃,the composites present a γ+α2 lamellar structure.With Nb2O5 content increase,the aggregate degree of Al2O3 particles is improved with dispersively distributed along the grain boundary,meanwhile,the dual-phase γ+α2 lamellar structure is refined with more homogeneous distribution.Nb2O5 additive plays an important role in adjusting phase content and refining structure,which is beneficial to improving the properties of the composites.关键词：Al2O3/TiAl Matrix Composites;In-situ Synthesization;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：TiB2-Al2O3-TiAl3 particulates reinforced aluminum matrix composites were in-situ synthesized in Al-TiO2-B2O3 system by mechanically alloying method.Grain size and lattice distortion degree of TiO2 powder after milling were presented through comparatively analyzing the XRD curves of the powder before and after milling,furthermore,the milled powder was observed by ESEM and TEM.The transformation of phase compositions in process of in-situ synthesis was observed with raw materials at different milling time for 1,2,3 hours by XRD and ESEM.The microstructure and mechanical properties of the composites prepared by hot-pressing sintering milled powders were investigated by ESEM and TEM and tensile testing.The results reveal that fine and uniformly distributed ceramic particulates with several micron in the matrix alloy can be observed,exhibiting desirable bonding with the matrix,and tensile strength of the composites reaches 327.4 MPa.关键词：Mechanical Alloying;High Energy Milling;In-situ;Ceramic Particle Reinforcement;Aluminum Matrix Composites
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- 351
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发布时间：2023-12-18 - 摘要：Effects of heat treatment on morphology of primary α phase and hardness of B-refined Al-7Si alloy were investigated to determine the optimized heat treatment rule.The results indicate that primary α phase is converted from irregular dendrite into uniformly distributed equiaxied granular grain and then into rosette structure with holding for from 3 hours to 12 hours at 450℃,in which the ideal grain morphology can be observed with holding for 6 hours.With holding for 8 hours and increasing temperature from 300 to 540℃,primary α phase is evolved from developed dendrite into rosette and granular structure.Granular primary α phase with smaller size and uniform distribution can be observed in the alloy at 400450℃,however,with holding at more than 450℃,primary α phase is transformed into irregular coarse morphology.The orthogonal analyses shows that the optimized heat treatment parameters are（540±10）℃ for 6 hours.关键词：B-refined;Al-7Si Alloy;Hardness
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发布时间：2023-12-18 - 摘要：Phase constituent in as-cast microstructure and microstructure of the semi-continuous 2D70 aluminum alloy in as-cast,normal homogenization and high temperature homogenization were observed by optical microscope（OM）,SEM（scanning electron microscope）,EDS（energy dispersive spectrum）,XRD（X-ray diffraction）and DSC（differential scanning calorimetry）.The results reveal that as-cast microstructure of the alloy is composed of Al2CuMg,Al2Cu,Al9FeNi,Al7Cu2Fe,Al7Cu4Ni phase,presenting amounts of non-equilibrium eutectic phases.DSC and XRD analysis indicate that after one-step homogenization treatment,Al2CuMg phase can be dissolved into the alloy with the presence of some high melting point eutectic phase,and the initial melting temperature of Al2Cu phase is increased,which provides a base for two-stage homogenization treatment.Eutectic phase with melting point is fully dissolved into the alloy after two-sage homogenization treatment.In addition,change of Al9FeNi,Al7Cu2Fe,Al7Cu4Ni phase in the ingot is not observed during homogenization process.关键词：2D70 Aluminum Alloy;Microstructure;Homogenization Treatment;High temperature Homogenization
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发布时间：2023-12-18 - 摘要：The as-cast magnesium alloy was prepared with alkaline earth element,such as Ca,Ba and Sr,by melting-casting.Microstructure,phase constituent and mechanical properties of the alloy were investigated by OM（optical microscope）,SEM（scanning electron microscope）,EDS（energy dispersive spectrometer）and XRD（X-ray diffraction）as well as tensile testing.The results show that the as-cast microstructure of the alloy can be significantly refined as a result of comprehensive effects of Ca,Ba and Sr element,in which net-like β-Mg17Al12 phase is converted into globular structure with dispersive distribution.In addition,the ambient tensile strength is increased form 156.3MPa of AZ91D alloy to 184.6MPa of AZ91D-0.5Ca-0.2Ba-0.1Sr alloy.关键词：AZ91D Magnesium Alloy;Alloying;Mechanical Properties
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发布时间：2023-12-18 - 摘要：The friction testing were carried out for H13 steel with Al-7Si,Al-12Si and Al-30Si samples,respectively,at 330℃ to observe simultaneous spheroidization and refinement of Si phase in friction surface of Al-Si alloy.It is found that Si phase is both refined and spheroidized in frictional layer of Al-Si alloy surface,in which average diameters of Si particle in three kinds of alloys reach 0.89,0.98 and 1.05 μm,respectively,and shape factors reach 0.79,0.71 and 0.67,respectively.关键词：Si Particles;Refinement;Spheroidization;High Temperature Friction;Al-Si Alloy
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发布时间：2023-12-18 - 摘要：Origination of defects in roller-bearing base was analyzed.Through adjusting pouring ways,adding pad and pouring basin as well as foamed ceramic filter,adopting open-gating system with slot gate and whole ring riser as well as spraying coating on sand mold surface and drying the mold,the sequential solidification in the base can be realized,effectively eliminating shrinkage porosity（hole）,sand inclusion and so on.The qualified rate of the base exceeded 90%.关键词：Pad;Pouring Basin;Foamed Ceramic Filter;Slot Gate;Whole Ring Riser
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发布时间：2023-12-18 - 摘要：Chemical conversion coating was prepared on AZ31 magnesium alloy profile in phosphate solution.Growth and morphology characteristics of coating were analyzed by SEM（scanning electron microscope）,XRD（X-ray diffraction）and mass-loss measuring method,and the formation mechanism of the conversion coating was approached.Mass-loss testing shows that there exists rapid corrosion dissolution of the alloy matrix accounting for more than 2/3 of the whole mass-loss in the early growth stage of the coating.Phosphate conversion coating exhibits two-layer structure,in which substrate layer consisting of interphase banding distribution of scaly and stripy structure exhibits orientation.The obvious slot between the bonding location of the two layer can be observed as a result of microstructure difference,which is responsible for the decrease of corrosion resistance of the substrate layer.Growth characteristics of phosphate conversion coatings were closely relevant to the microstructure features and chemical state of the matrix alloy.关键词：Magnesium Alloy;Phosphate;Conversion Coating;Growth Characteristics
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发布时间：2023-12-18 - 摘要：AZ31B alloy ingots were prepared by applying ultrasonic vibration on the top of the melt with different powers and water-cooling at the bottom of the stainless steel crucible.Quantitative metallographical analysis software was employed to calculate the grain size of primary α-Mg phase in the solidification structure.The results reveal that with increasing in ultrasonic powers,the nucleus numbers are increased as a result of the enhancement of cavitation-induced nucleation.Meanwhile,with accelerating in acoustic streaming,the diffusion of the latent heat and the solute at the roots of secondary dendrite arm and the dispersion of dendrite-broken are improved,which is responsible for the transformation of α-Mg phase from dendrite into rosette and granular structure.With applying ultrasonic power of 600W,the average grain size of the α-Mg phase can be dropped to 93μm,while it becomes coarse with 800W power because of the heating effects of ultrasonic more than the dissipation of the latent heat.关键词：Magnesium Alloy;Ultrasonic Vibration;Grain Refinement
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发布时间：2023-12-18 - 摘要：Effects of Al content on microstructure and mechanical properties of AlxCoCrCuFeNi multi-element high entropy alloy were investigated by XRD（X-ray diffraction）,SEM（scanning electron microscope）and compressive testing.The results verify that microstructure of the as-cast alloy exhibits typically dendrite in which there exists distinctly Cu-enrichment.With increasing in Al content,FCC content is decreased and BCC phase content is increased,which results in the high yield strength and plastic strain more than 5.8% in AlCoCrCuFeNi alloy.关键词：Multi-element High Entropy Alloy;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：We have developed a single crystal copper bonding wire to carry out ball bonding testing,and bonding rally（BPT）and shearing stress（BST）were measured to the welding joint on ball bonding wire,meanwhile,the microstructure,interface morphology and micro-hardness of the bonding point were investigated.The results show that BPT and BST of the welded point in ball bonded wire exhibits approximately normal distribution,showing a higher credibility.The CPK（process capability index）of the single crystal bonding wire with 50 μm in diameter makes 1.8 or more than 1.8,exhibiting desirable parameters.The interface of the welded point after reliability testing exhibits clear and relatively straight,in which absence of trace dispersively distributed intermetallics in the interface and the Kirkendall cavity can be observed,showing stable electron properties and interface structure.关键词：Single Crystal Copper Bonding Wire;Ball Bonding;Reliability
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发布时间：2023-12-18 - 摘要：Obvious change of crystal structure in ZA27 alloy was observed under the high pressure more than 1GPa.The change rule of crystal structure in ZA27 aluminum alloy was revealed by XRD（X-ray diffraction）at different high pressures.The results reveal that with increasing in pressure,the crystal face distance and lattice constant of Al-rich α phase are decreased.Compared with those of one at normal pressure,the crystal face distances of Al-rich α phase at（200）,（220）and（311）crystal face are reduced 1.07%,1.15% and 1.43% at 5GPa pressure,respectively,and lattice constant is reduced from 4.04800 to 4.00468.关键词：Super-high Pressure;ZA27 Alloy;Crystal Structure;XRD
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发布时间：2023-12-18 -
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