最新刊期
卷 32 ， 期 2 ， 2012
- 摘要：Mechanism of the evolution and refinement of the primary Si in A390 alloy was analyzed based on rapid solidification and the heredity theory of liquid structures in A390 alloy billets in the case of the near liquidus semi-continuous casting . Influence of the pouring temperature from 10 ℃ to 100 ℃ above the liquidus on the morphology of the primary Si in A390 alloy was investigated under the conditions of casting velocity 120 mm/min and cooling water flux 0.05 m3/min. The results show that the near liquidus semi-continuous casting process is in favor of uniform nucleation and abnormal growth restraint of the primary Si due to an appropriate match in rate of the nucleation and growth. The morphology and distribution of the primary Si in the alloy can be improved by controlling the casting parameters without adding the refiner and modifier to the melt, showing great significance to the processing simplifying, resource saving and cost reducing.关键词：Semi-solid Forming;Near-Liquidus Semi-Continuous Casting;Hypereutectic Al-Si Alloy;Primary Si
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发布时间：2023-12-18 - 摘要：Effects of static magnetic on the microscopic grain density, solidification rate and distribution of alloy elements in 2024 aluminum alloy were investigated by means of thermal simulation experiment and scanning electron microscope （SEM）. The results show that the solidification structure can be refined with increasing in magnetic intensity, and the solidification time is decreased, which are closely related to the Seebeck effect acting on liquid metal in solidification front as a result of enhancing the flow of liquid metal and inhibiting the electromagnetic brake effects. Furthermore, the static magnetic field can promote disfussion of solute atoms in aluminum alloy, and it is favorable to improving solid solubility of alloy elements and decreasing macro-segregation of 2024 aluminum alloy.关键词：Static Magnetic Field;2024 Aluminum Alloy;Solidification Structure;Seebeck Effect
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发布时间：2023-12-18 - 摘要：The DC-cast technology for a new type super-high strength aluminum alloy sheet ingot containing higher Zn than that in AA7055 alloy was investigated through simulation combining with experiments. The results show that, it is beneficial to the casting formation of the ingot with appropriately decreasing the elements content such as Zn, Cu, Fe, Si and Mn, and increasing the Mg content in the super-high strength aluminum alloy under conditions of meeting comprehensive property requirements. The range of casting parameter for the new type alloy is very narrow, resulting in easy crack of the ingot during the casting process. The 180 mm×360 mm alloy ingot was successfully produced through simulation and experiments with using water-restrict panels to the ingot.关键词：Super-High Strength Aluminum Alloy;Sheet Ingot;DC Casting;Simulation;Water-Restrict Panels
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发布时间：2023-12-18 - 摘要：<正>发改委最近公布的数据显示,2011年前11个月,有色金属行业实现利润2114亿元,同比增长52.8%,增幅同比回落27.5个百分点。其中,有色金属矿采选业利润659亿元,增长52.3%,回落
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发布时间：2023-12-18 - 摘要：<正>据闽西新闻网报道,截至目前,漳平市现代装备制造业特钢铸造基地项目已累计完成固定资产投资3.42亿元,完成用地平整1600亩、土方941万方。该项目总投资71.47亿元,分二期实施,一期投资为42.06亿
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发布时间：2023-12-18 - 摘要：<正>中冶集团完成一项低碳高强度马氏体不锈钢铸造创新技术攻关,该铸件材质为ZG06Cr13Ni4Mo,属低碳高强度马氏体不锈钢,广泛用于核电、汽电站等领域,铸造难度非常大。此
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发布时间：2023-12-18 - 摘要：<正>由高州市经济和信息化局引进的首条由电脑操控替代繁重人工操作的全新的铸造生产线在高州市金山开发区（高州胜宝铸造有限公司）建成（首期）投入试生产。该线的建成将大大推进该市铸造
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发布时间：2023-12-18 - 摘要：<正>近期,国家质量监督局、国家标准化管理委员会联合发布了中华人民共和国国家标准GB/T26658-2011《消失模铸件质量评定方法》,这是我国消失模铸造行业的第一个国家标准。作为国
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发布时间：2023-12-18 - 摘要：<正>法士特集团公司在2011年实现了"十二五"开局之年的大跨越,生产经营完美收官,各项经营指标再创佳绩。集团全年累计实现销售收入108.56亿元;销售汽车变速器701018台;出口创汇4028.39万美元,同比增长128.17%。
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发布时间：2023-12-18 - 摘要：<正>根据中国模具工业协会经营管理委员会编制的《全国模具专业厂基本情况》统计,铸造模具约占各类模具总产值的5%,每年增长速度高达25%。国际模具及五金塑胶产业供应商协会负责人罗百辉分析认为,铸造模
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发布时间：2023-12-18 - 摘要：Effects of parameters, such as sample weight, heating rate, carrier gas flow, thermal analytical atmosphere, and crucible status, on thermal analysis DTG of release agent for aluminum alloy were investigated. The optimal parameters for thermal analytical test method to performance evaluation of release agent were determined as follows: cycling water temperature of 25 ℃, carriers gas flow N2 of 100 mL/min, protective gas N2 of 20 mL/min, heating rate of 15K/min, start temperature of 80 ℃ and end temperature of 660℃ as well as samples weight of about 10 mg and crucible with cover free. Under the selected parameters conditions, dramatic decomposition temperatures were determined for the same release agent sample at different times, and the difference value was less than 2 ℃.关键词：Aluminum Alloy;Release Agent;Thermal Analysis
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发布时间：2023-12-18 - 摘要：A suitable coating proportion of alcohol based coating for green sand steel castings was obtained by experiment and practical tests . The practical application shows that, the film performance of the coating exhibits desiable with crack free, and peeling free and high strength at room temperature and high temperature after drying can be observed. Meanwhile, the coatings exhibit desirable anti-cracking ability at high temperature with low gas evolution. Steel wave pillows and the side frames for trains show excellent surface quality by green sand casting with the alcohol based coatings.关键词：Green Sand;Alcohol-Based Coating;Spraying
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发布时间：2023-12-18 - 摘要：Processing design of two kinds of hydraulic castings with difficult manufacturing was described. For multi-spool control valve body, cavity design with frame core head was adopted, and gating system design followed sequential solidification of heat-riser, where metal melt is filled from sprue, runner, restraint-slag channel to riser and then to cavity. For port plate of pintle blade-pump, a design scheme in which all oil ports were set on the disc core head was adopted.关键词：Hydraulic Casting;Valve Body;Gating System
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发布时间：2023-12-18 - 摘要：Through adding solid FeS2 in a sealed melting furnace for magnesium alloy, effects of FeS2 addition, melting temperature and holding time on protective role of AZ91D magnesium alloy melt were analyzed at air containing FeS2 atmosphere, and morphology, constituent and phase composition of oxidized film were observed by SEM （scanning electron microscope）, EDS（energy dispersive spectrometer） and XRD （X-ray diffraction）. The results show that the acceptable protective effects can be obtained with melting temperature below 760 ℃. Melted at 730 ℃ for 30min, the protective effect is dissatisfied with 1g FeS2 addition, while it is satisfied with 2 g FeS2 and 5g FeS2 addition, however, it is turned bad with FeS2 addition increased to 10 g in the sealed melting furnace with 13 L in volume. Melted at 730 ℃ for 60min, the protective effect is bad with 2g FeS2 addition while it is desirable with 5g FeS2 addition. With melting temperature increased to 800 ℃ for 30 min, the protective effect on AZ91D magnesium alloy is worse that with 2 g FeS2 addiiton. The surface film formed on the magnesium alloy at air containing FeS2 is composed of MgS and MgO phase with compact structure. And the thickness of the film formed is increased with increasing in holding time in range of 1.02.0 μm.关键词：Magnesium Alloy;Melt;FeS2;Surface Film
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发布时间：2023-12-18 - 摘要：Wear and frictional behavior of different high purity aluminum ceramic prepared were investigated comparatively. The results show that frictional coefficient is changed with ceramic components. The plastic deformation is dominant in the wear mechanism. However, with increasing in presure, the wear mechanism is changed from plastic deformation into brittle fracture. Through adding modified composition in the Al2O3 ceramics and keeping the smooth surface, it is favorable to improving the wear resistance of the ceramics.关键词：High-Purity Alumina Ceramics;Friction Coefficient;Mechanical Properties;Load;Surface Roughness
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发布时间：2023-12-18 - 摘要：In order to develop the technology of rapidly precision spray forming tooling, microstructure and mechanical properties of HM1 hot forging die processed by precision spray forming were investigated by OM （optical microscope）, SEM（scanning electron microscope）, XRD （X-ray diffraction） and mechanical testing, and were compared with those of one processed by conventional casting tooling. The results indicate that the HM1 hot forging die with good surface quality and clear outline can be produced, and the average relative density reaches 99.5%. The grain size in spraying formed tool is approximately 15 μm, compared with about 100 μm in casting tool, significantly refined. After tempering at 520 ℃ for 2 hours, the hardness of the spraying formed specimen is HRC54, while it is only HRC49 in the casting specimen. The fracture analysis shows that the casting specimen exhibits the mixture fracture with brittle fracture and ductile fracture, and the typical ductile fracture is presented in the spray formed specimen.关键词：Precision Spray Forming;Hot Forging Die;Relative Density;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：<正>据萨默塞特当地媒体称,拥有100年历史的灰铁及球墨铸铁件生产企业Somerset Foundries公司（位于美国宾夕法尼亚州萨默塞特）已向员工发出了正式的停业通知,企业在12月30日将最后
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发布时间：2023-12-18 - 摘要：Thermal circulation in the die-casting die for casting steering column bracket was simulated by the FLOW-3D software. Two cooling water schemes were designed. The temperature distributions of both inside-wall of die cavity and whole mold were analyzed. The simulated results show that circulated water channel with curve structure is the desirable design, which can be a reference to mold design and processing parameter selection.关键词：Magnesium Alloy;Die Casting;Mold;Thermal Circulation;Numerical Simulation
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发布时间：2023-12-18 - 摘要：Numerical simulation was employed to investigate the filling and solidification process of centrifugal casting ZTC4 case. Influences of pouring temperature of the melt, centrifugal rotational speed and preheating temperature of the mould on the flow fields during filling process and the temperature fields as well as stress fields during solidification process were analyzed. The formation of defects in centrifugal casting ZTC4 case was approached. The simulation results indicate that with the increase of the centrifugal rotational speed, although change of the mould filling rate can be ignored, the effect of Coriolis force on the melt becomes more significant, resulting in the thin of molten flow in the mould. When the superheat of the melt is lower than 30 ℃, the misrun can be observed. The factors influencing residual stress of the castings are as follows in importance: preheating temperature of mould, centrifugal rotation velocity, and melt super-heating. The shrinkage porosity （hole） defects are prone to easily appear in the thicker position of the castings, and their location is in accordance with the X-ray inspection results.关键词：ZTC4 Alloy;Centrifugal Casting;Numerical Simulation;Defects;ProCAST Software
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发布时间：2023-12-18 - 摘要：The semi-solid slurry of AZ91D magnesium alloy was prepared by a novel self-inoculation method, and the role of fluid director in formation of non-dendritic microstructure in semi-solid slurry was described. The results show that temeprature of the alloy melt is decreased sharply to nearby liquidus as a result of absopting a lot of super-heat by fluid director after pouring alloy melt with inoculation tretament on fluid director. With melt flowing on the fluid driector, heterogeneous nucleation is promoted and a large amount of free grains are generated, resulting in a proliferation of grains density during solidification, so the microstructure of solid shell solidified on the fluid director surface is varied from developed dendritic to fine dendritic, and finally to equiaxed grain. The degree of slope angle has affected flow way and heat transfer effects. An excessively high or small angle is harmful to the proliferation of grain density, and the desirable cooling and shearing effect can be obtained with slope angle of 45°,where the number of efficient grains is the most and the microstructure of primary phase in semi-solid slurry presents small size and uniform distribution.关键词：Slurry Preparation;Solidification Process;Self-inoculation Method;Magnesium Alloy AZ91D;Semi-solid State
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发布时间：2023-12-18 - 摘要：In order to eliminate the shrinkage hole in the low pressure die casting fine spokes aluminum automobile wheel, a point cooling temperature control was designed to cool the spokes root,and it was proved to be effective by the experiment. By detecting and controlling the temperature at the spoke area effectively, the solidification of liquid aluminum alloy from the edge to the center is realized, and the shrinkage cavity defects are eliminated, obtaining good effects.关键词：Low Pressure Die Casting;Mold Temperature Control;Fine Spokes Wheel Hub
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发布时间：2023-12-18 - 摘要：To meet the requirements of own-brand car named "Trumpche" belonging to Guangzhou Automobile Group （GAC）, high vacuum die-casting technology for the rear sub-frame of car chassis was developed including mechanical properties of the alloy, processing design and optimization, design and manufacturing of the mould, quality control of die castings. The results show that good sealing effect can be improved by adopting high vacuum die casting die with heat resistant sealing structure. Die temperature controlling precision was improved by thermocouple positioned in multi-location of the die and on-time adjustment of cooling water flow rate. Through optimizing processing parameters, some defects, such as crack, cold shut, shrinkage porosity （hole）, can be eliminated. The car chassis with tensile strength over 240 MPa, yield strength over 145 MPa and elongation greater than 6%can be achieved, meeting the use requirements.关键词：Vacuum Die Casting;Light Weight;Al-Mg Alloy;Car Chassis;Rear Sub-frame
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发布时间：2023-12-18 - 摘要：During producing net-shaped investment casting directional blades for engine, through analyzing origination of deformation, determining the measures of preventing deformation, designing rational gating system and combination clamping device as well as strengthening control, deformation of super-thinned fine-long directional net-shaped blades was eliminated, and the dimensional precision of the blades was improved. Finally, the net-shaped blades for engine meeting requirements were produced successfully.关键词：Investment Casting;Net-Shaped;Super-Thinned Fine-Long Blades
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发布时间：2023-12-18 - 摘要：Ni based alloy was melted commonly in vacuum furnace, and it was difficult to melt in main frequency furnace. Through optimizing processing design and adding Ar protective measures, Ni based alloy was melted successfully in main frequency furnace to be produced by investment casting.关键词：Ni Based Alloy;Main Frequency Furnace;Processing Optimization;Ar Protection
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发布时间：2023-12-18 - 摘要：The variation of damping behavior with vibration amplitude, frequency and temperature in grey cast iron HT250 dense bar produced by horizontal continuous casting was measured by dynamic mechanical analyzer to understand the damping mechanism of the alloy. The results show that the damping behavior is increased with increasing in amplitude and frequency. An internal friction peak occurs at about 40 ℃ and is extrapolated by Snoek relaxation. The damping temperature curve shows inverse tendencies at higher temperature range and lower temperature range as a result of the occurrence of Snoek peak. There exists a critical amplitude range, and the damping behavior at higher amplitude is much higher than that at lower amplitude. The temperature-dependent damping capacity mainly is resulted from point-defect damping, while dislocation damping is predominant in the frequency-dependent damping and amplitude-dependent damping, which controls the damping behavior of the alloy.关键词：Horizontal Continuous Casting;Grey Cast Iron;Dense Bar;Damping Property
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发布时间：2023-12-18 - 摘要：Effects of the components of coating, such as refractory powder filler, adhesive and suspension-agent on the amount of gas evolution from the coating and suspension-ability of coating have been investigated. The proper proportion of coating composition was presented. The results show that absence of the defects in centrifugal casting iron pipe, such as pin-hole, gas holes and misrun, can be observed with amount of gas evolution from the coating less than 7.5 mL/g.关键词：Centrifugal Casting;Amount of Gas Evolution;Suspension Ability
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发布时间：2023-12-18 - 摘要：A wear-resistant hollow stell ball for E-type coal mill was produced by lost foam casting process. Two pouring schemes including the top pouring and the side pouring were designed. The filling and solidification of the two schemes were simulated by the Huazhu CAE software. The simulated results were analyzed comparatively. And the experiment results were well in agreement with the simulated ones. The advantages and disadvantages of producing large wear-resistant hollow steel ball with lost foam casting process were described.关键词：E-Type Coal Mill;Large Wear-Resisting Hollow Steel Ball;Lost Foam Casting;CAE Simulation
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发布时间：2023-12-18 - 摘要：The decomposition phenomena of WC particle at different heating conditions was analyzed, and microstructure of WC particles was observed with the help of OM （optical microscope） and SEM （scanning electron microscope） by analyzing decomposition behavior, and a decomposition mechanism of cast WC particle decomposition was presented. Through observing decomposition process of WC particles under different heating conditions, the decomposition mechanism of WC particle was described, and the determined role of heating in decomposition process was approached. The results show that heating plays a decisive role in decomposition process of WC particles. However, the decomposition process of WC phase is different from W2C phase, where W2C phase is superior to WC phase in decomposition process. Different interface behavior between WC particle and the matrix can be observed at different heating conditions.关键词：Casting Tungsten Carbide Particle;WC;W2C;Decomposition
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发布时间：2023-12-18 - 摘要：The intermetallic compound （IMC） formed at the interface between solder and substrate has a significant effect on the reliability of interconnection solder. The evolution of interfacial IMC in Sn-0.3Ag-0.7Cu/Cu solder joint and its effect on the mechanical properties were investigated under the different processing parameters including reflowing temperature, reflowing number and reflowing time, meanwhile, the fracture mechanism was also evaluated. The results indicate that IMC （η-Cu6Sn5） morphology is transformed from scallop-shaped to lath-shaped with the increase of reflowing time and temperature, and η phase dissolved into the solder position can be observed. With increasing in the reflowing time at 265 ℃, the η phase is grown increasingly with the decrease of grains. The growth rate of the interfacial IMC follows index power rules and its growth exponent is 0.339. It is also shown that the influence of the reflowing number on the shear strength is first increased and then decreased, and fracture mechanism is changed from pure shear fracture to micro-pore gathering fracture and then to partial brittle failure.关键词：Sn-0.3Ag-0.7Cu Lead-Free Solder;Reflow Welding;IMC Morphology;Shear Strength;Fracture Mechanism
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发布时间：2023-12-18 - 摘要：The multi-aluminum bronze powder was coated onto 45 steel by HEPJet. The corrosion resistance of HEPJet coating of the multi-aluminum bronze alloy in 3.5% NaCl solution was examined by using the weight-loss method, polarization curve method, X-ray diffraction（XRD）,scanning electron microscope（SEM）,energy dispersive spectrum （EDS） and electron probe micro-analyzer （EPMA）. The results show that the HEPJet coating of multi-aluminum bronze exhibits desirable corrosion resistance in 3.5% NaCl solution, where corrosion rate of the coating reaches 0.063 6 mm/a. After corrosion, the Al content in the surface layer of the samples is decreased greatly, while the Cu content is increased, showing the multi-aluminum bronze coating suffering dealuminization corrosion.关键词：Multi-Aluminum Bronze;HEPJet;Corrosion Resistance;Polarization Curve;Dealuminization
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发布时间：2023-12-18 - 摘要：SnxOy oxide inclusions were successfully separated from the Cu-10%Sn alloy with 1% Cu2O addition under the high frequency magnetic field. Influences of separating tube diameter, magnetic induction intensity and separating time on separation efficiency were investigated. The experimental results indicate that the desirable separation efficiency of oxide inclusions can be obtained for 60 s with the separating tube diameter of 12 mm and the magnetic induction intensity of 60 mT.关键词：Electromagnetic Separation;Copper Alloy;High Frequency Magnetic Field;Oxide Inclusion
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发布时间：2023-12-18 - 摘要：In order to investigate mechanical properties and the distribution of inclusions in the different parts of AM60B magnesium alloy ingots directly smelted from crude magnesium, the samples were cut from the left, middle and right part of the AM60B magnesium alloy ingots, and tensile and impact testing were conducted on different parts. The fracture morphology of the different parts cut from the AM60B magnesium alloy ingot was observed by means of SEM. And the distribution of the inclusions in the magnesium alloy was analyzed by means of EDS. The results show that tensile strength and crack strength in the middle part of AM60B magnesium alloy ingots directly smelted from crude magnesium are lower than those in the left and right parts, and elongation in the left, middle and right parts is increased gradually. Impact toughness in the middle part of the AM60B magnesium alloy ingots is higher than those in the left and right parts. The inclusions with Si exist in the left part of magnesium alloy. The inclusions of carbon and oxygen compounds exists in the middle part, and the solvent inclusions exists in the right part of magnesium alloy.关键词：Magnesium Alloy;Tensile Strength;Impact Toughness;Inclusion
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发布时间：2023-12-18 - 摘要：The refining effects and action mechanism of high-intensity ultrasonic on the primary Si in hypereutectic Al-Si alloy were investigated by treating Al-20Si melt with different sonophoresis ways. The results show that the nucleation rate in the alloy during solidification process can be increased by high-intensity ultrasonic treatment, where the shape of the primary Si is changed from the coarse plank structure into spherical ones with uniform distribution and the decrease of grain size. Refining effects are significantly different by treating with different sonophoresis methods due to the attenuation of the ultrasonic. The experimental results indicate that the primary Si is well refined with the more uniform distribution in the alloy, and the refinement area of solidification can be enlarged by treating with high-intensity ultrasonic when the ultrasonic rod is introduced with the circle movement at 1/2 of ingot casting radius to the center of melt.关键词：Al-20Si Alloy;Ultrasonic Treatment;Microstructure;Primary Silicon
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发布时间：2023-12-18 - 摘要：The microstructure and hardness changes of cast Mg-5Al-0.5Y alloy in permanent mold, graphite mold and sand mould were comparatively investigated by optical microscopy（OM）, scanning electron microscope（SEM）, X-ray diffraction （XRD） and hardness tester at the cooling rates of 200 ℃/min、150 ℃/min and 60 ℃/min, and mechanism was analyzed. The results show that: with the decrease of the cooling rate, α-Mg grain sizes are coarsened, and the average size is increased from 52.83 μm to 68.96 μm, increased by 30.53%, while the β-Mg17Al12 phase exhibits continuous to discontinuous nets distributions, and its relative content is decreased from 10.35% to 8.67%, reduced by 16.23%. The hardness of Mg-5Al-0.5Y alloy is decreased from 56.4 HV to 51.3 HV as a result of the decrease of cooling rate and coarseness of grain sizes.关键词：Magnesium Alloy;Cooling Rate;Rare Earths Element Y;Microstructure;Hardness
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发布时间：2023-12-18 - 摘要：Quantitative analysis of the microstructures of the ZL107 alloy under equilibrium conditions was performed using thermodynamic calculations. The effects of chemical composition and temperature on the microstructures of the alloy were investigated, and the microstructures of the alloy were also observed. The results show that the precipitating temperature and amounts of Al2Cu are controlled by Cu content, where the Al2Cu phase and precipitated temperature are increased with increasing in Cu content. However, the amounts of Al2Cu are decreased with the aging temperature higher than 210 ℃, and the optimized solid solution temperature and aging temperature are in range of 510520 ℃ and of 150200 ℃, respectively, through the thermodynamic calculation, which are well in agreement with experimental ones.关键词：ZL107 Alloy;Microstructure;Al2Cu;Thermodynamics Calculation
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发布时间：2023-12-18 - 摘要：<正>大威德金刚鎏金铜坛城（见下页）[1]明永乐（1403年1424年）总高82cm铜鎏金西藏博物馆藏大威德金刚是密宗的主尊。密宗是中国佛教十大宗派之一,别称喇嘛教。大威德金刚能伏恶护善,被认为是藏传佛教中无量寿佛的忿怒身。
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发布时间：2023-12-18
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