最新刊期
卷 29 ， 期 7 ， 2009
- 摘要：Effects of P on microstructure of in-situ Mg2Si/Al composites were described,and the composites with spherical semi-solid structure where both the matrix and reinforcement are spheroidized can be successfully prepared by the isothermal heat treatment,meanwhile,the spheroidization mechanism is approached. The results show that with P modification,Mg2Si particle in the as-cast microstructure of the composites is evolved from coarse dendrite into fine block structure. Furthermore,reinforcement with fine size and uniformly distribution exhibits regular spherical structure in the isothermal heat treated semi-solid composites,while morphology of α-Al in the composites also becomes spherical structure. In addition,with increasing in holding time,the hardly any change of Mg2Si size is found,however,the noted size change of α-Al phase can be observed.关键词：In-situ Mg2Si/Al Composites;Inoculation Modification;Semi-solid;Microstructural Evolution
- 2
- |
- 185
- |
- 5
发布时间：2023-12-18 - 摘要：Microstructure and mechanical properties of Mg-5Gd-3Nd-0.5Zr alloys containing different Y contents were investigated under different conditions. The results reveal that compounds at grain boundary in the alloys are mainly composed of Mg24Y5,Mg41Nd5 and Mg5Gd,furthermore,with increasing in Y content,the numbers and grain size of the compounds at the grain boundary are increased,however,average grain size still keeps approximately 5060 μm,showing slightly change. After homogenization treatment at 535℃ for 24 hours,compounds in the alloys are converted from continuous island structure at as-cast state into dispersively fine particles,where dispersively distributed particles in the alloys are mainly composed of Mg24Y5 and Mg41Nd5 phase while Mg5Gd phase is mostly decomposed and dissolved into the matrix. After extrusion,the microstructure with approximately 20 μm in average grain size can be observed in the alloy,and tensile strength,yield strength and elongation of the alloys can be greatly improved,in which desirable comprehensive mechanical properties can be observed in Mg-5Gd-5Y-3Nd-0.5Zr. The Y content should be controlled less than 5% in weight in designed alloys.关键词：Magnesium Alloy;Y Content;Homogenization;Extrusion;Microstructure;Mechanical Properties
- 2
- |
- 237
- |
- 5
发布时间：2023-12-18 - 摘要：Effects of alternative magnetic field on phase structure in ceramic layer of ceramic lined compound steel pipes fabricated by SHS were described,and NiO was added as additive to contrast. The results show that change of phase structure in ceramic layer can not be observed in alternative magnetic field. With increasing in magnetic flux intensity,size of α-Al2O3 is decreased,and morphology is gradually transformed into fine equiaxed grain structure. Effects of alternative magnetic field are strengthened by adding NiO,which results in the refinement of grain size at a lower magnetic flux density.关键词：SHS;Alternative Magnetic Field;Microstructure;Grain Refinement
- 2
- |
- 66
- |
- 3
发布时间：2023-12-18 - 摘要：Effects of different hot rolling processing parameters on microstructure and mechanical properties of twin rolling-casting AZ61 magnesium alloy strip were investigated. The results indicate that with hot rolling at 400℃,the grain size in the microstructure of the rolling-casting AZ61 magnesium alloy is refined as a result of the increase of recrystallization with increasing in reduction. In addition,with increasing rolling temperature,twin crystal is reduced and recrystallization is increased in the microstructure,resulting in the refinement and uniform distribution of grain. The sheets exhibit desirable mechanical properties with hot rolling at 400 ℃ to 1.5 mm in thickness.关键词：AZ61 Magnesium Alloy;Casting-rolling Sheet;Hot Rolling;Twin Crystal
- 2
- |
- 268
- |
- 2
发布时间：2023-12-18 - 摘要：Effects of solid solution and aging treatment on microstructure and hardness of thixoforming AZ91D magnesium alloy were investigated. The results reveal that diffusion,dissolve and ripening would successfully take place in thixo-forming AZ91D during T4 treatment. The hardness of the T4 treated alloy is increased with increasing in solution temperature as a result of solution hardening. During the subsequent aging treatment,β-Mg17Al12 phase is prior to discontinuously precipitate from the grain boundary of α-Mg phase,and then continuously precipitated from theα-Mg phase. Hardness of α-Mg phase is gradually raised with increasing in aging time and in aging temperature due to precipitation strengthening.关键词：Thixo-forming;Solid Solution;Aging;Hardness
- 2
- |
- 133
- |
- 2
发布时间：2023-12-18 - 摘要：The compression testing at elevated temperatures was carried out for 1235 aluminum alloy prepared by different purification ways with the help of dynamic thermal simulation experimental technology. The material constants of hot deformation have been presented by multivariate regression directly,and effects of inclusion content in 1235 aluminum alloy on the constants were analyzed empathically. The results reveal that purification has the great effects on the materials constant of 1235 aluminum alloy during hot deformation,especially on the hot deformation activation energy,where the better the purification effects,the lower the hot deformation activation energy is. Compared with that of 1235 aluminum alloy prepared by other purification methods,the hot deformation activation energy of the alloy prepared by high-efficiency purification treatment which possesses the lowest inclusion content exhibits the lowest of 149.51 kJ/mol,showing desirable hot plastic performance. Inclusion content makes as a function of the hot deformation energy activation energy,in which with decreasing in inclusion content,the hot deformation activation energy is decreased. Oxidation inclusion in the alloy,such as Al2O3,during hot deformation,can pin the dislocation,restricting the bundle gathering of the dislocation and widening the width of the extending dislocation. Therefore cross-slip of screw-dislocation is not easy to generate by decreasing the fault energy,so hot deformation activation energy is increased.关键词：1235 Aluminum Alloy;Purification Treatment;Inclusion Content;Hot Compression Deformation;Material Constant;Hot Deformation Activation Energy
- 2
- |
- 122
- |
- 2
发布时间：2023-12-18 - 摘要：Zn-Al alloy wire billets were prepared by radial extrusion based on the 90°angular pressing principle to improve the processing and application performance. Microstructure and mechanical properties of the alloy wire were analyzed. The results show that grain size in the radial extruded alloy wire is obviously refined with the formation of fibrous structure. Compared with that prepared by axial extrusion,tensile strength of the radial extruded alloy wire is decreased by 15%,however,elongation is increased by approximately 30%. The radial extrusion technique is in favor of drawing of wire billets,and the resistance is reduced during feeding the wire into spraying gun.关键词：Zn-Al Alloy;Radial Extrusion;Microstructure;Mechanical Properties
- 2
- |
- 122
- |
- 1
发布时间：2023-12-18 - 摘要：Effects of low-voltage electric current pulse were described on solidification structure and mechanical properties of ignition-proof magnesium alloy ZM5-3Ca. The results show that the solidification structure in the alloy is refined after applying low-voltage electric current pulse,in which the primary phase is converted from developed dendrite into near-spherical or rosette structure. Primary phase in the alloy is increasingly spheroidized with decreasing in cooling rate,meanwhile,with increasing in pulse voltage,the grain size in the alloy is refined gradually,and yield strength and tensile strength of the alloy are improved,however,the obvious change of plasticity can not be observed. With voltage of 400V,yield strength and tensile strength of the alloy are increased by 9% and 19%,respectively,compared with those of ones without low-voltage electric current pulse.关键词：Low-voltage Electric Current Pulse;Ignition-proof;ZM5-3Ca Alloy
- 2
- |
- 113
- |
- 3
发布时间：2023-12-18 - 摘要：Wear resistance of TiN coating prepared by multi-arc ion plating on ZL109 aluminum alloy surface has been examined. The results show that wear resistance of the ZL109 aluminum alloy with multi-arc ion plating TiN coating can be significantly improved. With applying 1N and wearing for 90min,the abrasive width of the samples without TiN coating makes approximately 2 times of that with TiN coating,and average frictional coefficient of the samples with TiN coating makes approximately 50% of that without coating. With applying 2N,the morphology and abrasive width are varied as time increases. The wear morphology of the ZL109 alloy samples with TiN coating is characterized by adhesive abrasion in early stage and by abrasive abrasion in last stage.关键词：Aluminum Alloy;Multi-arc Ion Plating;TiN Coating;Wear Resistance
- 2
- |
- 258
- |
- 2
发布时间：2023-12-18 - 摘要：A two-dimensional meso-scale cellular automaton model was developed to simulate the transformation of austenite to ferrite in 15SiMn steel. The simulated results show that,at a given isothermal temperature,the average growth rate of ferrite is decreased gradually during the austenite transformation. With the ferrite growth rate decreasing to zero,the carbon concentration in the austenite at the interface reaches equilibrium carbon concentration of 0.52395%. In addition,the morphology of ferrite grains on austenite boundary exhibits ellipsoidal,which is attributed to carbon diffusion and movement of austenite-ferrite interface higher in the austenite boundaries than that in austenite interiors.关键词：15SiMn Steel;Isothermal Transformation;Cellular Automaton
- 2
- |
- 152
- |
- 1
发布时间：2023-12-18 - 摘要：Based on the ANSYS software,the temperature field in CPC high-speed steel roller in continuous casting was simulated. The power of heating equipment and other parameters that could meet the requirements of fusion were determined by the optimum design. The simulated results reveal that solidification sequence of outer cladding metal shows from bottom to top and from inner-outer layer to central position. Outer cladding metal nearby the fusion interface of roll mandrel experienced the process of solidification-fusion-re-solidification.关键词：CPC Method;Continuous Casting;Temperature Field;Finite Element Method
- 2
- |
- 231
- |
- 3
发布时间：2023-12-18 -
-
-
-
-
-
- 摘要：<正>中国铸造协会精铸分会第十一届年会定于2009年10月下旬在河北省石家庄市召开,会议由石家庄艾力格、华成、瑞特三公司协办、会议将通过主题报告、专题报告和宣读论文等形式,进行广泛的交流。会议同时举办精密铸造原辅材料及设备仪器展示会。
- 2
- |
- 16
- |
- 0
发布时间：2023-12-18 -
- 摘要：We have developed a new mechanical stirring machine for preparing continuous semi-solid slurry. Effects of some parameters,including different temperature,stirring velocities,stirring time,cooling rate,on the microstructural evolution in the slurry were described. The results verify that grain in the slurry becomes more and more spherodization with decreasing in slurry temperature and increasing in stirring velocity and stirring time as well as cooling rate.关键词：Semi-solid;Aluminum Alloy;Mechanical Stirring;Stirring Velocity;Cooling Rate
- 2
- |
- 373
- |
- 4
发布时间：2023-12-18 - 摘要：CuNiSiTi electrode holder mobile bar was produced by investment casting,and effects of heat treatment on the mobile bar were investigated. The mechanical properties and microstructure of the alloy were examined and observed by the sclerometer,eddy electrical conductivity tester and universal material testing machine as well as OM （optical microscope）,meanwhile,strengthening mechanism of the alloy was described. The production verifies that electrode holder mobile bar with qualified quality can be successfully produced by designing proper gating system. The hardness,electrical conductivity,tensile strength,yield strength and elongation of the alloy reach 210HB,13.92MS/m,590MPa,485MPa and 11%,respectively,after solution at 920℃ for 1.5 hours （ water cooling） and at 480℃ for 3 hours （furnace cooling）,meeting the property requirements of electrode holder mobile bar.关键词：Investment Casting;CuNiSiTi Alloy;Solution-ageing
- 2
- |
- 71
- |
- 0
发布时间：2023-12-18 - 摘要：Recovery and reutilization of waste shell mold （sodium silicate +quartz powder） were conducted. The results show that the performance indexes of the treated powder and sand are improved through adding proportionally new sand and powder,showing desirable recovery and reutilization.
- 2
- |
- 130
- |
- 0
发布时间：2023-12-18 - 摘要：Effects of multi-artificial aging on mechanical properties of low pressure casting A356.2 aluminum alloy wheel were investigated. The results show that tensile strength,yield strength and hardness are slightly improved,however,the elongation is decreased in multi-artificial aging alloy. The fluctuating amplification of mechanical properties is weakened with increasing in artificial aging times,so the microstructure tends to stable. After T6 heat treatment,although coarse grain size in A356.2 alloy can affect the Absence of yield strength and hardness,it can decrease tensile strength and elongation of the alloy wheel. The results show that with multi-artificial aging,the strength and hardness of the A356.2 aluminum alloy wheel are increased with the decrease of elongation and the stability of properties. However,the elongation of the alloy is deteriorated with increase in grain size in A356.2 aluminum alloy in low pressure casting.关键词：A356.2 Aluminum Alloy;Wheel;Multi-artificial Aging;Mechanical Properties
- 2
- |
- 200
- |
- 3
发布时间：2023-12-18 - 摘要：A pre-processing program for numerical simulation of squeezing casting was developed,which was successfully employed to the pre-processing mesh generation of a squeezing casting housing. Through developing key technologies for treatment of OpenGL image to rapidly draw the image and eliminate the hidden lines,the desirable image was visualized. Through micro-vibration method shifting odd point to modify the hole or cavity defects in the STL files,discrete treatment of uniform mesh generation in the housing was realized. The results verify that the pre-processing program exhibits reliable and effective and available.关键词：Pre-processing;Numerical Simulation;Squeezing Casting;Mesh Generation
- 2
- |
- 178
- |
- 1
发布时间：2023-12-18 - 摘要：We have developed a set of pressurization solidification experimental apparatus to examine the effects of varied pressures and pressurization rate on mechanical properties of lost foam casting ZL101 aluminum alloy components. The results show that with increasing in applied pressure,the density and mechanical properties of the lost foam casting ZL101 alloy components are improved gradually,and porosity rate in the castings is greatly decreased,meanwhile,the mechanical properties of the castings exhibit slightly increasing tendency. With a fixed pressure,the density and properties of the casting are closely related to the pressurization rates. The lost foam casting ZL101 alloy components exhibit desirable performance at pressurization rate of 0.003 MPa0.03 MPa. In addition,corrosion resistance of the alloy components is further improved as a result of the increase of density and decrease of pin-hole defects in the components at pressurization solidification.关键词：Lost Foam Casting;Aluminum Alloy;Pressurization Solidification;Pressurization Rate;Microstructure and Properties
- 2
- |
- 170
- |
- 4
发布时间：2023-12-18 - 摘要：Ni-coated carbon nano-tubes （Ni-CCNTs）/Mg-Al-Zn composites were fabricated by stirring casting method. High temperature mechanical properties of the composites were tested and microstructure was observed by means of OM （optical microscope）. The results show that with Al addition,the high temperature mechanical properties of the composites can be significantly improved. With 8% Al addition,high temperature tensile strength of the composites reaches maximum value of 152MPa,compared with that of matrix samples,increased by 166.7%. In addition,with increasing in Al addition,intermetallic compound Mg17Al12 phase is increased with more continuous distribution,resulting in the great refinement of grain size.关键词：Magnesium Alloy;Composites;Carbon Nanotubes;High Temperature Mechanical Properties;Microstructure
- 2
- |
- 81
- |
- 1
发布时间：2023-12-18 - 摘要：The microstructural ternary layered single phase Ti2AlC ceramics was synthesized by high energy milling and vacuum hot-pressing sintering using Ti,Al and reactive carbon powders as raw materials. The in-situ reaction process and effects of Al content on the reaction and microstructure of the ceramics were examined by DSC,XRD （X-ray diffraction） and SEM （scanning electron microscope）. The results show that Al content has remarkable effects on the synthesis of high purity Ti2AlC ceramics. With 28% Al content,the Ti,TiC and Ti-Al intermetallics composites were formed by high energy milling for 12 hours in Ar atmosphere,and the single phase Ti2AlC ceramics was successfully prepared by hot-presses sintering the composites at 1300℃.关键词：Ti2AlC;Machinability;High Energy Milling;Hot Pressing Sintering
- 2
- |
- 170
- |
- 2
发布时间：2023-12-18 - 摘要：Effects of cryogenic treatment and its cycles on mechanical properties of the 38%SiCp/A356 MMCs （metal matrix composites） which was prepared by stirring-casting method were tested. The results reveal that yield strength and tensile strength of the MMCs are improved by approximately 10% after cryogenic treatment,however,the distinct effects of cycles on mechanical properties can not be observed. Microstructural observation and the EDAX analysis show that the precipitation of Si phase and other super-micro-second phase can be observed in process of cryogenic treatment. Fracture morphology shows that the fracture mechanism of the MMCs is characterized by cleavage crack of SiCp coupled with tearing of matrix due to the occurrence of regular cleavage face in process of crack.关键词：Aluminum Matrix Composites;Cryogenic Treatment;Mechanical Properties
- 2
- |
- 300
- |
- 2
发布时间：2023-12-18 - 摘要：Al2O3 ceramic-lined composite gun for coal-dust-injection produced by combustion synthesis method exhibited low service life as a result of low ductility and low thermal shock resistance of Al2O3 ceramic-lined layer. The ceramic-lined curved composite gun for coal-dust-injection with high strength and ductility can be produced successfully by introducing ZrO2 into （CrO3 +Al） system based on SHS gravitational separation method,in which ceramic-lined layer consists of eutectic Al2O3-ZrO2 composite ceramics. ZrO2 fiber with nano-micron size in diameters can enhance the ceramic matrix,and rod-like eutectic structure with orientation growth can improve the toughness of the ceramics as a result of rod-like eutectic grain bridge and pull-out,which can effectively improve the elevated strength and wear resistance of ceramic lined layer,so the service life of coal-dust-injection gun is greatly improved.关键词：SHS;Coal-dust-injection Gun;Nano/micron Composite Ceramic;Toughness
- 2
- |
- 73
- |
- 2
发布时间：2023-12-18 - 摘要：Effects of minor Sc addition on microstructure and mechanical properties of the as-cast Mg-7Gd-3Y alloys at room temperature and at 200℃ were investigated by optical microscope （OM）,scanning electron microscope and XRD. The results show that with 0.5%Sc addition,the alloy at room temperature and at 200℃ is increased by 25MPa and 18MPa in tensile strength and by 28 MPa and 22MPa in yield strength as well as by 18.3% and 30.2% in elongation,respectively,as a result of promoting the precipitation of Mg24（Y,Gd）5 and Mg5（Gd,Y） phase and decreasing the relative content of Gd in Mg24（Y,Gd）5 phase.关键词：Mg-7Gd-3Y Alloy;Sc;Microstructure;Mechanical Properties
- 2
- |
- 79
- |
- 1
发布时间：2023-12-18 - 摘要：Effects of different Y contents,including 0,0.93%,2.25% and 3.50%,on microstructure and mechanical properties of Mg-0.8Zn-0.35Zr alloy were investigated. The results reveal that grain size in the alloy can be refined with Y addition,furthermore,with increasing in Y content,the secondary phase on the grain boundary and lamellar structure in grain are increased. In addition,with Y content increase,the ambient and elevated tensile strength of the alloy are improved,and the ambient elongation exhibits the phenomena of first increase and then decrease,where it reaches 26% with 0.93% Y content,however,the elevated elongation is decreased,alternatively,elevated creep resistance of the alloy is obviously improved.关键词：Y;Magnesium Alloy;Microstructure;Mechanical Properties;Creep Properties
- 2
- |
- 296
- |
- 8
发布时间：2023-12-18 - 摘要：Effects of Zr contents on microstructure and mechanical properties of as-cast and in heat treated Mg-5Zn-2Al magnesium alloy were investigated by OM （optical microscope） and tensile testing machine. The results verify that grain size in as-cast and in heat treated Mg-5Zn-2Al alloy can be remarkably refined with Zr addition. The tensile strength and elongation of the as-cast and heat treated alloy are firstly increased and then decreased. With 0.6% Zr addition,the desirable grain size in the as-cast alloy can be observed,and the tensile strength and elongation reach 215MPa and 12.563%,respectively. Compared with that of as-cast alloy,the tensile strength of the heat treated alloy is greatly improved with different Zr additions. With 0.6% Zr addition,the tensile strength of the heat treated alloy reaches 249MPa.关键词：Mg-5Zn-2Al Magnesium Alloy;Microstructure;Mechanical Properties;Heat Treatment
- 2
- |
- 209
- |
- 1
发布时间：2023-12-18 - 摘要：Effects of Fe/Si ratio and cooling rate on morphologies and types of secondary phase in microstructure of Al-Mn wrought aluminum alloy were investigated by OM （optical microscope） and SEM （scanning electron microscope） and XRD （X-ray diffraction）. The results reveal that with Fe/Si ratio lower than 2.5,skeleton α-Al12（Fe,Mn）3Si phase can be observed in the alloy,while Fe/Si ratio more than 2.5,acicular β-Al85（Mn,Fe）14Si phase can be found in the alloy. In addition,generation of skeleton α-Al12（Fe,Mn）3Si phase can be promoted with increasing in cooling rate.关键词：Wrought Aluminum Alloy;Fe/Si Ratio;Cooling Rate;Microstructure
- 2
- |
- 202
- |
- 1
发布时间：2023-12-18 - 摘要：Friction-welding techniques for Al-Si alloy piston were investigated. The results indicate that cast Al-Si alloy can be welded by friction-welding method. The desirable welding joint can be formed in the cast Al-Si alloy piston by applying a higher frictional pressure and punching pressure and a shorter frictional time,and tensile strength of inner and outer welding joint in piston cooling galley are meet the strength requirements of the matrix alloy.关键词：Friction-welding;Al-Si Alloy;Tensile Strength
- 2
- |
- 102
- |
- 2
发布时间：2023-12-18 - 摘要：Effects of varied super-heated temperatures on the solidification microstructure and subtle structure in ZL114A alloy have been observed by OM （optical microscope） and SEM （scanning electron microscope） and XRD （X-ray diffraction）. The results reveal that α-phase dendrite in the alloy can be greatly refined with super-heated treatment at 925℃. Furthermore,with increasing in temperatures,the lattice constant is increased and dislocation density and micro-hardness of the α-matrix are improved,meanwhile,the morphology of the α-phase is converted from acicular structure into spherical structure with decreasing in size of eutectic phase.关键词：ZL114A Alloy;α-phase;Lattice Constant;Micro-Hardness
- 2
- |
- 142
- |
- 1
发布时间：2023-12-18 - 摘要：Effects of progressive solution treatment on microstructure and mechanical properties of 7055 aluminum alloys were investigated. The results reveal that the tensile strength and yield strength of the 7055 aluminum alloy are improved with the slight decrease of elongation after progressive solution treatment. Meanwhile,microstructure of the treated alloy with uniform and fine grain can be observed by OM （optical microscope） and SEM （scanning electron microscope）.关键词：High Strength Aluminum Alloy;Progressive Solution;Microstructure;Properties
- 2
- |
- 433
- |
- 4
发布时间：2023-12-18 - 摘要：Effects of different temperatures and subsequent solution treatment on microstructure and mechanical properties of hot extruded AZ61 magnesium alloy were investigated. Fracture morphology was observed by SEM （scanning electron microscope） and its fracture mechanism was presented. Mechanical properties of the alloy with refined grain can be effectively increased as a result of the generation of high density dislocation after hot extrusion. The hot-extruded AZ61 magnesium alloy exhibits uniform structure and desirable plasticity at 385℃. After solution treatment,the strength of the alloy is greatly improved with hot-extrusion at 370℃ while strength and plasticity are deteriorated at 385℃,however,plasticity is significantly improved at 400℃.关键词：AZ61 Magnesium Alloy;Hot Extrusion;Solution Treatment;Microstructure;Mechanical Properties;Fracture Mechanism
- 2
- |
- 677
- |
- 9
发布时间：2023-12-18 - 摘要：Al2O3-dispersively-strengthened copper alloy sheets were prepared with Cu2O as oxidizer by internal oxidation method. Effects of different Al content （0.14%,0.3%） and different internal oxidation time （3,8,12h） on electric conductivity,hardness and microstructure of the sheets were investigated. The results verifiy that with increasing in internal oxidation time,the grain size in the sheets becomes coarser,meanwhile,at a given oxidized time,with increasing in Al content,the thickness internal oxidization layer is decreased with the coarse grain size. In addition,Al2O3 dispersively strengthened copper alloy exhibits acceptable electrical conductivity and high hardness.关键词：Al2O3 Dispersively Strengthened Copper Alloy;Internal Oxidation;Micro-Hardness
- 2
- |
- 304
- |
- 1
发布时间：2023-12-18 - 摘要：Pb-4Sb alloy components with low hardness were produced by permanent mold casting to cancel machinery working. Designing idea of separating face shaping in mould design was presented,meanwhile,the preparation process of master alloy in process of metal melting was cancelled. The finished components with machinery working free were successfully produced.关键词：Separating Face Shaping;Simply Permanent Mold;Finished Component;Pb-4Sb Alloy
- 2
- |
- 50
- |
- 0
发布时间：2023-12-18 - 摘要：Mo-Cu alloy,containing different Co contents were prepared by mechanical alloying method. Density,hardness,electric conductivity,thermal conductivity,thermal expansion coefficient and microstructure of the prepared Mo-Cu alloy were tested and observed to understand effects of Co element on densification and microstructure as well as properties of the alloy. The results show that the inert-phase Co7Mo6 is created between Co and Mo,Cu element,which is beneficial to the decrease of densification temperature,and the relative density of the Mo-Cu alloy reaches 97.7% with sintering at 1250℃. With increasing in Co element,the hardness of the Mo-Cu alloy is increased with the observed decrease of electric conductivity and thermal conductivity,however,the thermal expansion coefficient shows the slight fluctuation,which is near to that of Al2O3 ceramics. In addition,the microstructure of the Mo-Cu alloy exhibits homogeneous fine network structure.关键词：Activitated Element;Co;Mo-Cu Alloy
- 2
- |
- 137
- |
- 7
发布时间：2023-12-18 - 摘要：<正>刖人守门方鼎[1]（见下页）西周（前11世纪——前771年）中期锡青铜通高17.7cm,口纵9.2m,口横11.9cm1976年陕西扶风出土陕西周原博物馆藏
- 2
- |
- 171
- |
- 0
发布时间：2023-12-18 -
-
-
- Technical support is provided by Beijing Founder electronics co., LTD 京ICP备09064830号-19
京公网安备11010802024621 - It is recommended to read the content of this site in Chrome&IE9+. Please switch to extreme mode in browser 360.
- Cookies We use cookies to help provide and enhance our service and tailor content. By continuing, you agree to the use of cookies.
0