最新刊期
卷 36 ， 期 5 ， 2016
- 摘要：Effects of high pressure treatment on microstructures and mechanical properties of AM60 B magnesium alloy were investigated by X-ray diffraction,optical microscopy and scanning electron microscopy.The results show that with pressure,the grain size of AM60 B magnesium alloys is refined with uniform distribution.High pressure aging treatment can affect the morphology and distribution ofβ-Mg17Al12 phase.With the 2GPa pressure of aging treatment,the compression strength is increased by9% compared with that of aging treatment ones under ambient pressure.关键词：AM60B Magnesium Alloy;High Pressure Aging Treatment;Microstructure
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发布时间：2023-12-18 - 摘要：The as cast microstructure of high-Nb contained TiAl-based alloys exhibits coarse and inhomogeneous,and there exists a little of B2 phase and long strip silicide and boride precipitated along the grain boundaries,resulting in the degradation of alloy plasticity,strength and fracture toughness at room temperature.The influences of different heat treatments on the structure of Ti-45Al-8Nb-0.5W-0.8B-0.2Si alloy were investigated,and homogenization heat treatment and cycle heat treatment were adopted to eliminate segregation,improve phase composition and refine layer microstructure.The results show that desirable microstructure can be observed in the alloy by the homogenization process along with the furnace heated to 1 200℃for 24 h,and then air cooling and then recycle heat treatment with rapidly heated to 1 150 ℃for 4h,air cooling,repeating the process three times.关键词：Ti-45Al-8Nb-0.5W-0.8B-0.2Si;Heat Treatment;Microstructure
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发布时间：2023-12-18 - 摘要：The characteristics and stress state-strain rate of indentation-flatten compound deformation technology（IFCDT）were analyzed.Effects of strain state of IFCDT on microstructure of AZ31 magnesium alloy were described.The results show that the strain state is the main factor influencing the twin grain of magnesium alloy.In tensile deformation area,a small amount of twin grain can be observed,while the grain refinement can be ignored.In the compression deformation area,fine compression twins occur,and the grain size is refined obviously.During indentation-flat compound deformation（IFCDT）,tensile deformation and compression deformation（or compression deformation and tensile deformation）are changed alternatively.The microstructure evolution law of AZ31 magnesium alloy deformed by IFCDT is that compression strain→twins formation→dynamic recrystallization occurs→twin disappear→grain refine.Grains are refined with uniformly distribution.Microstructure of magnesium alloy sheet is improved.The mechanism of improving performance of the magnesium alloy by IFCDT is that the alternation change between tensile deformation and compression deformation resulted to nucleation rate is the greater than grain growth rate,so complete dynamic recrystallization occurs,and grain is refined greatly.关键词：AZ31Magnesium Alloy;Compound Deformation;Twin;Microstructure
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发布时间：2023-12-18 - 摘要：SiC nanoparticles reinforced AZ91 D magnesium matrix composites were fabricated by high-energy ball milling integrated with mechanical stirring.The results indicate that the grains in AZ91 Dmagnesium alloy are refined significantly by adding SiC nanoparticles,in which SiC nanoparticles are uniformly distributed.The grains in the AZ91 Dmagnesium alloy exhibit desirable with 1.5% SiC nanoparticles addition.And yield strength,elongation,hardness and bending strength of the composites are improved by 45.9%,63.4%,24.3% and 6.3% than those of AZ91 D magnesium alloy,respectively.However,the grains are coarsened and the mechanical properties are decreased with the excessive SiC nanoparticles addition.关键词：SiC Nanoparticles;AZ91D Magnesium Alloy;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：To the disadvantage of the traditional black coloring,Ti/DLC film was deposited on 925 silver alloy substrate by sputtering coating combined with anode-layer ion source,and the properties of the films under different process parameters were analyzed.The results show that by changing the negative bias,working gas partial pressure and depositing time,the Ti/DLC film can achieve pure and glossy black coating,and its microhardness and critical scratching load can be adjusted.When Ti film is sputtering coated on 925 silver alloy substrate with the negative bias of-120 V,argon partial pressure of 0.40 Pa and depositing time of 10 min,and DLC film is deposited on Ti film with the negative bias of-180 V,C2H2partial pressure of 0.250.30 Pa and depositing time of 4045min,the Ti/DLC film exhibits the relatively desirable comprehensive performances,including the appearance decorative effect,corrosion resistance and mechanical properties.关键词：925Silver Alloy;Sputtering Coating;Anode-layer Ion Source;DLC Film;Process Parameters
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发布时间：2023-12-18 - 摘要：Effects of Gd on as-cast microstructure and corrosion resistance of rare earth magnesium alloy Mg-Nd-Y-Zn were investigated by OM,weight loss and electrochemical testing.The results indicate that the second phase with discontinuous net-like structure distributed on the grain boundary and dispersed particle precipitation phase distributed uniformly inα-Mg are increased with the increase of rare earth element Gd addition to 3.0%,and the grain sizes reach the minimum value.The minimum corrosion rate of alloy in immersion test measured is 0.217mg·cm-2·h-1,and corrosion current density is the lowest and corrosion potential reaches the highest value.关键词：Rare Earth Magnesium Alloy;Gd;Microstructure;Corrosion Resistance
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发布时间：2023-12-18 - 摘要：Aiming at the actual use of sleeve for blast furnace tuyere and the main failure mode in use,the methods were put forward for adopting the high temperature resistant alloy in the inner wall by arc deposition process and plasma spraying process of high-temperature ceramic materials in the outlet wall.By proposing the material of the transition layer as JSTNi6382 and the surface as D450,the microstructure,micro-hardness,wear resistance and thermal shock resistance of the cladding layer were analyzed.The micro-hardness was measured along the deposition direction of strengthening equidistant samples.The results reveal that the micro-hardness of the sample along deposition direction exhibits gradient increase.The wear tests show that the wear resistance of D450 is 5.8times of copper and D600 is 17times of copper at room temperature.Experimental results show that the thermal shocking resistance of the sample by HDMR process is far superior to that of one by plasma spraying.关键词：Blast Furnace Tuyere;Longevity;Arc Deposition;High Temperature Resistant Alloy
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发布时间：2023-12-18 - 摘要：Hot deformation behavior of Ti60 alloy was carried out on a Thermecmastor Zsimulator at9201 100℃and strain rate at 0.00170.0s-1.The elevated temperature deformation behavior of the Ti60 alloy was characterized based on ananalysis of the true stress-strain behavior.The results show that the low stress is increased with increasing in strain rate and decreasing in temperature.In theα+βtwo phase region,theαphase volume fraction is decreased and spheroidization rate of lamellar structure is increased with the increase of deformation temperature.The flow localization can be observed in the deformed microstructure with the lower deformation temperature and the higher strain rate.In theβphase region,the deformation mechanism is characterized by dynamic recrystallization when the strain rate is low,while the strain rate is high,it is easy to cause the mechanical instability.关键词：Titanium Alloy;Defomration Behavior;Microstructures;Strain Rate Sensitivity
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发布时间：2023-12-18 - 摘要：Surface modification of AZ91 alloy for automobile engine was carried out by plasma coagulation process,and effects of the current on the microstructure,wear resistance and corrosion resistance of the modified layer were analyzed.The results reveal that the modified layer is composed ofα-Mg andβ-Mg17Al12,which is the same with phase constituent of the AZ91 matrix alloy,however,the phase content in the modification layer is the higher than that in the matrix alloy.With the increase of current,theβ-Mg17Al12 phase content in the modified layer is increased.The wear loss of modification layer with65 A,55Aand 45 Ais the lower than that of AZ91 alloy,and the wear loss of the coating layer is decreased gradually with the increase of current.The corrosion resistance of the alloy is improved after surface modification,and the corrosion resistance of the alloy is as follows:65Acladding layer>55A cladding layer>45Acladding layer>AZ91alloy matrix.The corrosion morphology is consistent with the results of the dynamic potential polarization curves.关键词：AZ91Alloy;Plasma Coagulation;Microstructure;Wear Resistance;Corrosion Resistance
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发布时间：2023-12-18 - 摘要：The filling and solidification process of the titanium alloy exhaust duct was simulated based on the ProCAST software.The results show that there exist a lot of shrinkage porosity in the casting by simulation,which was consistent with the actual ones,seriously affecting quality of the casting.Two methods were used to optimize the pouring process including setting the risers on the outside of the casting wall and changing the shell preheating temperature.The optimized process can effectively reduce the number of the shrinkage porosity.关键词：Titanium Alloy;Numerical Simulation;Shrinkage Porosities;Process Optimization
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发布时间：2023-12-18 - 摘要：In order to improve product rate,control arm was produced with Al-7Si-Mg by squeezing casting substutited for forging forming.The results reveal that squeezing casting control arm has the feature of structure compactness with fine grain size,where SDAS is lower than 40μm,tensile strength and yield strength are more than 310 MPa and 240 MPa,and elongation reach up to 12%as well as hardness of approximate 100,respectively.The technical indexes are improved significantly with decreasing product cost as well as improving accuracy and efficiency.关键词：Control Arm;Al-7Si-Mg Alloy;Squeeze Casting;Microstructure and Mechanical Properties
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发布时间：2023-12-18 - 摘要：Based on analysis of features of clutch housing,key problems in low pressure casting clutch housing were described.The defects in thick-position of housing were eliminated by some countermeasures,such as setting holding riser,adjusting couting thickness,setting pre-casting hole and optimizing gating system as well as adjusting pouring parameters.The clutch housing could meet the practical requirement.关键词：Clutch Housing;Casting Defect;Downsprue
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发布时间：2023-12-18 - 摘要：Aiming at the short frame structure characteristics combined with production practice,the Anycasting software was used to analyze the effects of runner size on the shrinkage porosity（holes）.The results reveal that runner design has important influence on feeding effect of the part in squeezing casting.The feeding pressure of alloy liquid can feed for the parts though the runner during the squeeze casting.However,for the thick position far away the gate,feeding effects is inhibited because of the validity of the pressure transfer by the structure of the short frame.Through adopting partial extrusion or cooling water and chilling block,the elimination of local shrinkage porosity can be realized by adjusting solidification sequence of the thick parts.关键词：Squeeze Casting;Simulate Analysis;Partial Extrusion;Chilling Block
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发布时间：2023-12-18 - 摘要：Vacuum die casting technology was developed based on the vacuum station and chill venting valve.The results demonstrate that area of vacuum die casting machine control system is reduced up to1.35m2.Then stability and reliability of vacuum station system are improved,greatly decreasing the operation technological requirement of the worker.Through setting chilling venting valve,the maintenance of vacuum valve was reduced,and labour intensity was relieved.关键词：Vacuum Die Casting;Vacuum Control Systems;Vacuum Station;Chilling Exhaust Valve
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发布时间：2023-12-18 - 摘要：The numerical simulation of semi-solid filling and defect of aluminum alloy briquetting was carried out with the casting simulation software.The design key points of the semi-solid die casting mold were presented,and the semi-solid die casting mold was designed according to the simulation.The process parameters for semi-solid slurry preparation were determined by three sets of semi-solid theological die casting experiment,and the qualified semi-solid die castings were produced sucessfully.关键词：Aluminum Alloy Briquetting;Semi-solid;Numerical Simulation;Die Casting Die
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发布时间：2023-12-18 - 摘要：The semisolid slurry of AM60 alloy was prepared by self-inoculation method,and the cold chamber die casting machine was employed to form the semisolid slurry under different injection speeds to investigate effect of injection speed on defects formation for rheo-diecastings.Insufficient filling was observed with the speed less than 0.5m/s,however,with increasing speed to less than 2m/s,the complete shape of castings was obtained along with the cold shut formation at the end surface of casting.In addition,with injection speed higher than 7m/s,serious flash defects were generated.Microstructural observation indicates that with increasing in injection speed,the amount and size of gas-pores in microstructure are increased,while liquid segregation is decreased,and the amount and size of inclusion is increased.With the injection speed less than 1m/s,the morphology of primary solid phase is deteriorated and the secondary dendrites in liquid are increased.Therefore,although a high injection speed can increase the microstructural uniformity of casting,the increased pore and inclusion defects also generated increasingly,which is not beneficial for the improvement of mechanical properties of semisolid castings.关键词：Injection Speed;Defect;AM60Alloy;Semi-solid;Rheo-forming
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发布时间：2023-12-18 - 摘要：Mechanical vibration was carried out during the solidification of lost foam casting（LFC）high chromium cast iron.The effects of vibration frequencies on the non-metallic inclusions content,microstructure,hardness and impact absorbing energy of as-cast high chromium cast iron were investigated.The results indicate that the microstructure is refined significantly,especially the vibration frequency of50 Hz,and the non-metallic inclusions content is reduced obviously and the impact absorbing energy is improved obviously,especially the vibration frequency of 30 Hz.In addition,the hardness is increased with the increase of frequency.
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发布时间：2023-12-18 - 摘要：The storage modulus and loss modulusof the wax during cooling process were measured by the advanced rheometric expansion system.The main modulus curves and wax relaxation time spectrum were calculated according to time-temperature equivalence principle.Finally,viscoelastic deformation of wax pattern during deposited process was predicted by using the finite element software Abaqus.关键词：Wax Pattern;Numerical Simulation;Relaxation Modulus;Viscoelastic
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发布时间：2023-12-18 - 摘要：The X-ray imaging of 1st-grade high-pressure turbine blade body was performed by computed radiography（CR）with IPU and IPS imaging plate,respectively.The optimized exposure parameters of turbine blade body were determined,and the CR reference images with high resolution were presented,and image quality indicator（IQI）sensitivity and image grey were used to evaluate the image quality.The comparative results of CR imaging show that film replacement by computed radiography with IPU imaging plate for digital X-ray imaging of turbine blade body is feasible.As for an X-ray exposure of multiple blades in film radiography,three turbine blades and four turbine blades were imaged,respectively,in a radiographic inspection by CR.Experimental results show that the radiation intensity of exposure field is uniform,and more turbine blade bodies can be inspected by computed radiography.关键词：Turbine Blade;Computed Radiography;Sensitivity;Grey;Digital X-ray Imaging
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发布时间：2023-12-18 - 摘要：Based on the heat transfer theory,by simplifying the complicated and unstable question,the condition used to get metal castings without shrinkage porosity in the optimum state was presented.The optimum temperature gradient at the directional solidification direction and the solidification direction from side to center is in direct proportion to the difference between pouring temperature and solidus temperature,and is inversely proportional to the flow distance of liquid alloy at the solidification direction,meanwhile,temperature gradient at three direction should be kept pace.The way of getting the optimum is to make the thickness of coat at the mold cavity become thicker and thicker along the solidification direction,meanwhile,the gradient of coat thickness at the mold cavity should be less in order to produce castings without shrinkage defect efficiently under the optimum temperature gradient with decreasing in the thickness of mold.In addition,the heat conductive coefficient of coat is decreased,while the heat conductive coefficient of mold is increased as a result forced cooling at the beginning stage when the mold-wall of the permanent mold is decreased.关键词：Metal Mould;Casting;Temperature Gradient
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发布时间：2023-12-18 - 摘要：Through simulating centrifugal casting process of large diameter double metal composite tube,influence of some parameters on the casting quality was investigated such as the outer metal pouring temperature,inner metal pouring temperature and the interval time of inner-outer pouring.The results show that the increase of the outer metal pouring temperature is beneficial for interface bonding as a result of holding temperature,and the interval time of pouring two metal casting controls the interfacial bonding.关键词：Numerical Simulation;Centrifugal Casting;Double Metal Tube;Temperature Field
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发布时间：2023-12-18 - 摘要：The particle reinforced aluminum matrix composites were prepared by powder metallurgy method,and effects of Si content on the friction properties of the composites were investigated by the dry friction experiment under different loading conditions.The experimental results reveal that the addition of Si can improve effectively the friction properties of particles reinforced aluminum matrix composites.With the increase of Si content,the friction coefficient and wear rate are decreased firstly and then increased.When 12% Si content,the friction coefficient and wear rate reach the minimum value.By analyzing the wear surface of aluminum matrix composites by SEM and EDX method,the wear mechanism of Al matrix composites is characterized mainly by abrasive wear and oxidation wear.关键词：Al Matrix Composites;Particle Reinforced;Friction and Wear
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发布时间：2023-12-18 - 摘要：Effect of solid solution and aging heat treatment on microstructure and mechanical properties of Mg-Nd-Zr alloy were investigated by optical microscope,scanning electron microscopy and hardness tester.The results show that with the increase of solution temperature and holding time,compounds in the grain boundaries are dissolved gradually when the alloy is treated at 460℃to 520℃.When the solution temperature is too high and the holding time is too long,grain is grown up.With the increase of aging time,the solution residual phase is dissolved gradually,and the second phase is precipitated homogeneously,so the alloy hardness is increasesd after solid solution at 490℃for 8h.The second phase is coarsened as a result of over-aging,which leads to the decrease of hardness.After 490℃×8hsolid solution treatment and 225 ℃ ×4haging treatment,the Mg-Nd-Zr alloy has the desirable mechanical properties.关键词：Mg-Nd-Zr Aolly;Heat Treatment;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：Scrap aluminum is an important raw material of aluminum alloy casting industry.It is a common and key issue how to identify its composition and regenerate former grade under industrial conditions.The application mode and the new concept "solid state aluminum scrap grade identification" has been presented by comparing the component identified method throughγ-rays,laser-induced breakdown spectroscopy component identification（LIBS or LIPS）and X-rays.The aluminum scrap regeneration process of "identification+liquid-solid grades accurate analysis" has been presented,based on the existing aluminum scrap recycling process.The process is a new way to overcome the problems which need component adjustment repeatedly in waste aluminum regeneration process.关键词：Scrap Aluminum;Recycling Aluminum;Regeneration;Cast;Component Identification
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发布时间：2023-12-18 - 摘要：The intergranular corrosion resistance of the Al-Cu-Li alloys contained Ag contents at T6 state was investigated by immersing testing in salt solution and electrochemical experiment.The results reveal that,with the increase of Ag content,the self-corrosion potential of the alloys is decreased while the self-corrosion current density is increased.And the depth of corrosion pits is increased accordingly also.Therefore,the addition of Ag in Al-Cu-Li alloys can result in the decreases of corrosion resistance.The addition of Ag can increase T1 phase and the width of precipitation free zone（PFZ）.Furthermore,the addition of Ag can promote the absorption of Mg cluster near the T1 phase.The lower standard electrochemical potential thanα-Al phase can result in the increase of the electrochemical potential difference between T1 phase andα-Al.关键词：Al-Cu-Li Alloys;Intergranular Corrosion;Ag Content;Microstructure
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发布时间：2023-12-18 - 摘要：The Al-Si-Cu alloy was prepared by permanent mold casting.The microstructure of the alloy was analyzed by SEM and EDS,and the mechanical properties of the alloy prepared were measured under different heat treatment conditions.The properties of the Al-Si-Cu alloy were analyzed by comparing microstructure,and the optimized heat treatment process of Al-Si-Cu alloy was determined by thermal analysis.The results show that Al-Si-Cu cast alloy exhibits good castability and excellent mechanical properties after heat-treatment.With Cu content in range of 0.6% 3.5%,with the increase of Cu content,Al2Cu and Q-Al5Cu2Mg8Si6 phase will be increased,so the alloy exhibits the higher strength and the lower elongation,where the maximal increment of tensile strength reaches up to 17%.关键词：Al-Si-Cu Alloy;Microstructure;Mechanical Properties;Solid Solution Treatment
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发布时间：2023-12-18 - 摘要：Effects of Sn addition（0,0.05%,0.10%）on microstructural evolution and mechanical properties of Al-2.5Cu alloy were investigated comparatively by using transmission electron microscopy（TEM）and tensile testing.The results show that the Sn addition can decrease precipitate size and increase precipitate number density,indicating a notable microalloying effect.The yield strength of alloys is increased with the Sn addition,and the peak-aged strength of the Al-2.5Cu-0.1Sn is improved by 50%compared with the Sn-free Al-2.5Cu alloy.However,the ductility of alloy is reduced with the Sn addition.关键词：Al-Cu Alloys;Sn Microalloying;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：Compact NiCr-Cr3C2 composite cladding layer was prepared on nickel-based single crystal superalloy by vacuum powder brazing technology.The microstructure of the cladding layer and the interface was observed by OM,SEM/EDS,XRD,EPMA.The results reveal that the cladding layer is composed of Ni3Si,Cr3Si,Cr7C3,γ-Ni,γ′-Ni3Al andγ+γ′eutectic,and microhardness of the cladding layer is12times higher than that of the substrate.As a result of the interdiffusion,a large amount of MCtype carbides are precipitated from the cladding layer side at the interface,while on the substrate side,plenty of carbides with various morphologies are precipitated due to the differences of structure and composition between interdendrite regions and dendrite cores.In addition,the evolution mechanism of"cruciate flower"carbide was described.关键词：Nickel-Based Single Crystal Superalloy;Vacuum Powder Brazing;NiCr-Cr3C2Cladding Layer
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发布时间：2023-12-18 - 摘要：The effects of melt superheating degree,cooling rate and aging treatment on the formation and thickness of intermetallic compounds（IMC）in Sn-9Zn/Cu interface were investigated.For comparison,the interfaces of Sn-3.5Ag-0.7Cu/Cu and Sn-37Pb/Cu at the same condition were also examined.Two reaction layers are formed at the Sn-9Zn/Cu interface:Cu-Zn layer adjacent to Cu substrate,and Cu-ZnSn compound layer adjacent to the solder.In addition,O element is also detected at the interface between the Cu-Zn layer and Cu-Zn-Sn layer.The results also show that melt superheating degree and cooling rate have great effect on the thickness of the reaction layers.With increase of the melt superheating degree and the slower of cooling rate,the thickness of IMC formed at solder/Cu is increased.The reaction layers formed at the Sn-9Zn/Cu and Sn-3.5Ag-0.7Cu/Cu interfaces are affected by the melt superheating degree and cooling rate more greatly than that of Sn-37Pb/Cu.During aging process,there exists a mutual competition between the decomposition of Cu-Zn compound layer and the growth of CuZn-Sn compound layer,resulting in the irregular change of IMC layer thickness of the air-cooled Sn-9Zn/Cu.The mechanisms of the formation of IMC layer and its changes during aging were described.关键词：Lead-free Solders;Sn-9Zn/Cu;Interface;Intermetallic Compounds（IMC）
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发布时间：2023-12-18 - 摘要：Cu99Zr0.5Al0.5alloy rods with a diameter of 20 mm was prepared by copper mold casting method,and effects of aging time and temperature on electrical conductivity and mechanical properties of Cu99Zr0.5Al0.5alloy were investigated,meanwhile,as-cast and cold-rolled microstructure of the alloy were observed.The results reveal that the Cu99Zr0.5Al0.5alloy is composed of fine,equiaxed grains and a few eutectic phases near the grain boundary.The grains are stretched and changed into banded structure after cold rolling.The Vickers hardness is increased firstly and then decreased with the increase of the aging time,while the electrical conductivity of the alloy is increased quickly at the initial stage and then tended to be stable.The optimized properties of Cu99Zr0.5Al0.5alloy were obtained under 450 ℃×1haging treatment with a Vickers hardness of 172,tensile strength of 460 MPa and electrical conductivity of34.86 MS/m.关键词：Copper Mold Casting;Cold Rolling;Electrical Conductivity;Vickers Hardness;Tensile Strength
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发布时间：2023-12-18 - 摘要：Thermodynamic of CuO by the in-situ reaction synthesis in Ag/CuO composites was calculated,and the diagram of the Gibbs free energy and temperature was drawn.The results show that there are three ways generating cubic copper oxide:firstly,cubic CuO is synthesized directly by Cu and O2;secondly,cubic CuO is synthesized by O2 and Cu2O which is generated by the process of sintering reaction section;three,cubic CuO is generated by phase transition in sintering after monoclinic CuO is synthesized by Cu and O2.And the synthetic temperature of the three modes was presented.Moreover,the oxygen partial pressure of in-situ synthesis was calculated and analyzed.The XRD diagrams of CuO and Ag/CuO reaction after sintering test was also analyzed.The conclusion of the thermodynamic calculation was further verified.关键词：In-situ Reaction Synthesis;Ag/CuO;Cubic CuO;the Way of Synthesis;Temperature
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发布时间：2023-12-18
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