最新刊期
卷 33 ， 期 4 ， 2013
- 摘要：The SiCp/AZ31 composites were prepared by stirring casting, and effects of stirring speed and stirring time on porosity and particle distribution in the composites prepared was investigated. The experimental results show that the process parameters, such as stirring speed, stirring time ,have a marked influence on the distribution of SiCp in MMC. A method called graded stirring is proposed to overcome the low reinforcement content. Magnesium matrix composites containing 25%SiC particles with standard distribution error lower than 0.1 can be prepared successfully by the graded stirring process.关键词：Particulate Reinforced;Composites;Stirring Casting;Graded Stirring
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发布时间：2023-12-18 - 摘要：Effects of Mn contents on physical properties and mechanical properties of W-40Cu alloy parts prepared by thixo-die-forging in pseudo-semi-solid state were investigated. The results show that the bending strength of W-40Cu alloy parts prepared is improved with Mn addition. With the increase of Mn content, bending strength of the thixoforged parts is increased with slowing tendency, and the bending strength is raised by more than 10%. Effects of Mn on density and conductive properties of W-40Cu alloy parts prepared by thixo-die-forging in pseudo-semi-solid state are similar, where the density and conductive properties are increased with proper Mn addition, however, they are decreased with Mn content more than 1.5%.关键词：Cu-W Alloy;Pseudo-semi-solid Thixo-die-forging;Mechanical Properties;Electronic Conductivity
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发布时间：2023-12-18 - 摘要：Electromagnetic stirring in secondary cooling zone of continuous casting slab can play an important role in improving the quality of slab, such as increasing equiaxed crystal ratio. Numerical simulation was conducted for roll-type electromagnetic stirring in the secondary cooling zone of the continuous casting slab by means of finite element analysis software ANSYS. The results show that when the distance of two groups of electromagnetic stirrer is 1 220 mm, the three-ring-like type is better than the ambi-butterfly type in stirring efficiency. While the two groups of electromagnetic stirrer are adjacent （0 mm）, the ambi-butterfly type is better than the three-ringlike type in stirring efficiency.关键词：Slab;Secondary Cooling Zone;Roll-type Electromagnetic Stirring;Numerical Simulation
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发布时间：2023-12-18 - 摘要：A metal matrix composite coating （MMCC）reinforced with an in situ synthezed TiC-TiB2 particulates has been fabricated successfully through the reaction of Ti in the substrate with Al and B4C in the slurry pasted on Ti-6Al-4V alloy by the low oxygen partial pressure fusing technique. XRD shows that the MMCC is composed of TiC, TiB2, TiAl3、Al2O3 and Al, and the volume fraction of ceramic TiC, TiB2 particulates in outer layer reaches appraoximately 55%. Meanwhile, the interfaces show a strong metallurigical bonding. It is believed that the aluminum serves not only as a diluent agent, activator agent and assistant agent, but also as a deoxidant agent and stuffing agent, providing a much easier route for TiC-TiB2 particulates formation in the fabrication of MMCC.关键词：Ti-6Al-4V Alloy;In Situ;TiC-TiB2 Particulates Reinforced MMCC;Fabrication
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发布时间：2023-12-18 - 摘要：Al-Fe alloy was prepared by main frequency induction vacuum furnace. The microstructure and the pulverization mechanism of Al-Fe alloy were observed by SEM （scanning electron microscopy）and EDS（energy dispersive spectrometer）. The results show that the pulverization of alloy is effectively prevented as a result of grain refinement and more compact microstructure with increasing in Ti content in the Al-Fe alloy.关键词：Deoxidizer;Al-Fe Alloy;Pulverization
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发布时间：2023-12-18 - 摘要：Effects of surface energy, grain size and shape of coating aggregates for metal mold casting on wettabillity of aluminum alloy melt and surface roughness of castings were investigated. The results show that the key factors influencing the wettability of alloy melt is surface energy of coating aggregates, and the secondary factors are grain size and shape. With the decrease of the aggregate surface energy, the contact angle of melt with coating is increased, and the corresponding roughness value of castings surface is decreased. With the grain size of aggregate less than 44 μm, the contact angles of melt with coatings are increased with the grain size increase. With the grain size of aggregates more than 44 μm, the contact angles of melt with coatings are decreased with the grain size increase. Spherical and acicular aggregate can improve the contact angles of melt with coatings and decrease the corresponding surface roughness.关键词：Aggregates;Grain Size;Grain Shape;Wettability;Surface Roughness
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发布时间：2023-12-18 - 摘要：<正>我国目前正处于对传统生产方式进行现代化改进阶段,不论是铁路、电站、船舶制造、航空航天等工程建设,还是汽车、工程机械、军工行业,均需要大量的高端机床。我国高档重型数控机床95%依赖进口,目前我国的机床铸造产业已经进入了发展的关键时期,在这个时期,创新已经成为推动机床铸造产业发展的新动力。据悉,攻坚时期的机床铸造产业同时也是其从
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发布时间：2023-12-18 - 摘要：<正>据中国钨业协会硬质合金分会提供的数据显示,2011年全国有硬质合金生产企业300余家,拥有专业科研院所30余家,全行业从业人员超过2.5万人。截至2011年,拥有10万t/a的钨精矿产能、18万t/a的钨酸和钨盐的产能、6.2万t/a的碳化钨产能、3.8万t/a的硬质合金产能,以及Co、Ni、Ta、Nb、Ti的配套供应能力。2011年中国硬质合金产量为2.35万吨,硬质合金行业销售收入209亿元,硬质合金出口近5000吨,出口
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发布时间：2023-12-18 - 摘要：<正>2012年,全国压铸件总产量102.4万吨,其中,铝压铸件80.2万吨、镁压铸件1.36万吨。2012年1～10月份,全国轿车产量385.01万辆,同比增长23.4%;销售360.01万辆,同比增长22.0%。压铸市场仍将保持快速增长势态。压铸有色金属资源可循环利用和压铸少无切削工艺的先进性,特别适应循环经济和清洁生产的要求,符
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发布时间：2023-12-18 - 摘要：<正>2012年12月份,我国生产铸钢件99.99万吨,同比增长1.34%。中商情报网监测数据显示:2012年1-12月,全国铸钢件的产量达1106.8万吨,同比增长11.56%。从各省市的产量来看,2012年1-12月,河南省铸钢件的产量达236.18万吨,同比增长4.64%,占全国总产量的21.34%。紧随
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发布时间：2023-12-18 - 摘要：<正>伺服节能技术是目前压铸机领域液压驱动技术的又一重大突破。近年随着市场对于压铸机的效率、稳定性、低能耗、可维护性、噪音等方面都提出了越来越高的要求以及伺服电机及其驱动系统的成熟应用和价格的大幅度下降。压铸机的驱动部分也从定量泵应用技术逐渐演变成伺服控制技术。压铸机电液伺服系统在兼顾成本与性能稳定性的前提下,解决了用户关心的成本、效率问题,代表了压铸机的发展方向。
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发布时间：2023-12-18 - 摘要：<正>兖矿集团轻合金公司熔铸车间历经一个月的科研攻关、工序调整,成功试制国内最大规格空心圆铸锭。据了解,该批次空心铸锭由国产50吨铸造生产线生产,产品规格外径为814mm、内径为269mm。该车间立足于高起点、高定位,潜心研究试制高附加值产品,不断进军铝铸造行业空白区
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发布时间：2023-12-18 - 摘要：<正>据国家统计局对347家规模以上复合材料生产企业2011年经营情况统计显示,工业总产值为582亿元,同比增长15.22%;销售产值为572亿元,同比增长15.17%;FRP出口交货为25亿元,同比下降9.13%。据中国复合材料工业协会调查,2011年我国热固性复合材料产量达263万吨,同比增长10.50%;热塑性复合材料达118万吨,同比增长29.67%;总产量达381万吨,同比增长15.81%,产量继续超越美国,蝉联世界第一。预测分析指出,全球
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发布时间：2023-12-18 - 摘要：<正>工信部发布报告显示,2012年我国10种有色金属产量为3691万吨,同比增长9.3%。其中,精炼铜、原铝、铅、锌产量分别为606万吨、1988万吨、465万吨、485万吨,同比分别增长10.8%、13.2%、9.3%、-5.6%。加工材方面,铜材和铝材产量分别为1168万吨和3074万吨,同比增长分别为和;铜、铅、锌、镍、锡、锑等六种精矿
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发布时间：2023-12-18 - 摘要：Aluminum alloy melt has the poor wettability with ceramic reinforcement, so it is the key of improving the wettability of aluminum alloy melt with the ceramic reinforcement. The present status about the wettability of ceramic reinforcements with aluminum alloy melt was reviewed, especially focusing on the influence of matrix alloy composition, the oxidation film of aluminum melt, surface state of ceramic, preparation process. In addition, some ways to improve the wettability were described.关键词：Aluminum Matrix Composite;Wettability;Surface Tension;Interface
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发布时间：2023-12-18 - 摘要：Aiming at the managing characteristics of small-middle foundry enterprises, casting information system based on B/S architecture was developed. The system is composed of five modules including system management, purchase, production, sales and storage. The key design and technologies of the system according to the working condition were expounded.关键词：Foundry Enterprises;Information System Design;System Implementation
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发布时间：2023-12-18 - 摘要：The three-dimensional （3-D） cellular automaton model is coupled with the numerical solution of momentum to simulate the dendrite growth of Al-Cu alloy in the presence of melt flow. The results show that growth of primary and secondary arm in the upstream direction is much greater than that in the downstream direction. With the increase of the flow velocity, the growth velocity of the upstream dendrite tip is increased, and the radius of upstream dendrite tip is decreased. The growth direction of the primary arm perpendicular to the flow direction tilts into the upstream direction. The dendrite tip of the primary arm perpendicular to the flow direction shows an asymmetric morphology in downstream sides. The degree of tilt and the asymmetry of the tip become stronger with the increase of the forced flow velocity. The Péclet number of the upstream dendrite tip is increased with the increase of the forced flow velocity.关键词：Dendrite;Three-dimensional Cellular Automaton;Flow
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发布时间：2023-12-18 - 摘要：Considering the structural features, through analyzing the forming process and combining with the die casting machine from the enterprise and technological parameters, the angle-pin & two-parting face die casting die was designed. The angle-pin and slide was designed both in the fixed half of the mould. And limit-bolt was used to control the distance. In feed system, four edge gates were designed for feeding in the same time, and through designing three spiral scroll in sprue bush, the excess stock was breakdown when the mould was opened, greatly simplifying the mould structure.关键词：Die Casting;Mould Design;Aluminum Alloy
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发布时间：2023-12-18 - 摘要：Based on the characteristics of vacuum counter-pressure casting, numerical simulation of filling process of vacuum counter-pressure aluminum alloy was carried out by the standard k-ε module from the ANSYS Fluent software, and a complicated thin-walled aluminum alloy housing was trial-produced by the vacuum counter-pressure casting technology to verify the simulated results. The results indicate that with the decrease of vacuum pressure and the increase of vacuum degree, filling velocity of liquid aluminum alloy is increased with more and more stable without obvious fluctuation phenomenon in filling morphology. With vacuum degree of 20 kPa, aluminum alloy housing castings were filled completely with the great decrease of gas-entrapment defects. Moreover, the experimental results are well in agreement with simulated ones, which shows that numerical simulation can provide a reference for practical production and the forming process optimization of vacuum counter-pressure casting complicated and thin-walled aluminum alloy castings.关键词：Vacuum Counter-Pressure Casting;Vacuum Degree;Filling;Numerical Simulation
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发布时间：2023-12-18 - 摘要：Procast software was used to simulate the solidification process of motorcycle right crankcase, and the feeding location was determined. The design system adopted inserts structure and combined-single parting surface as well as increasing thickness of ingate in the mould. With reasonable forming processing parameters, such as pouring temperature of 670～690 ℃, moving part temperature of 200 ℃ and static part temperature of 160 ℃ as well as filling velocity of 5 m/s, the squeezing casting complex thin-walled castings were conducted sucessfullu.关键词：Right Crankcase;Multi-Directional Squeeze Casting;Numerical Simulation;Mold Design
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发布时间：2023-12-18 - 摘要：The temperature of thin-fine core pin in die-casting mold is a major difficulty in the die-casting mold temperature control, which has significant effects on internal quality of the casting holes and service life of core pin. In order to solve such problems as the poor quality of small holes of die casting and deformation, soldering and fracture of thin-fine core pin, the control system of core pin cooling based on PLC and touch screen technology has been developed. High pressure cooling water combined with air blowing was used to decrease the temperature of the core pin in the system. The cooling water has the characteristics of independent, closed and circular. The hardware system was designed through the "PLC + touch screen" technology, in which PLC was the host computer, embedded touch screen combined with A/D conversion module as the core of whole system. The software system was composed of PLC control program and configuration system. Production and application results show that core pin temperature exhibits a lower fluctuation and service life is increased greatly after using the system. Meanwhile, casting quality is improved and the reject rate is reduced to below 2%. The advantages of the system include convenience for display, visualized, simple interface and stable and reliable controlling.关键词：Die Casting Mould;Core Pin Temperature;Cooling;PLC;Touch Screen
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发布时间：2023-12-18 - 摘要：Microstructural characteristics of the residual liquid phase in semi-solid 2024 wrought aluminum alloy slurry in the rheo-diecasting process was investigated by optical microscope（OM）, scanning electron microscope（SEM） and X-ray diffraction（XRD）. The results indicate that the microstructure of rheo-diecasted 2024 wrought aluminum alloy is composed of spherical and near-spherical primary α-Al phase, and irregular eutectic θ（CuAl2） and S（CuAl2Mg） phase which is continuously distributed in grain boundary. The secondary solidification process consists of three stages: direct growth of secondary primary （α2） phase from the surface of the primary α-Al phase particles without re-nucleation, independent nucleation of α3 phase from residual liquid and followed by the equiaxed growth, and finally the eutectic reaction. Coupled growth is the main solidification process of eutectic action. The eutectic α-Al attaches to the eutectic θ（CuAl2） phase and S（CuAl2Mg） phase, and grows through the bridge-growth mechanism. The α-Al、θ（CuAl2） phase and S（CuAl2Mg） phase are precipitated alternately after each other, and α-Al+θ（CuAl2）+S（CuAl2Mg） phase will form a laminar eutectic structure.关键词：Semi-solid;2024 Wrought Aluminum Alloy;Rheo-diecasting;Self-inoculation Method
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发布时间：2023-12-18 - 摘要：With the help of the heat exchange between copper tube of the circulating cooling water and the electromagnetic stirred AZ91D metal to control the enthalpy equilibrium process of alloy melt, semi-solid slurry with thixotropic spherical structure for semi-solid rheoforming was prepared. The semisolid slurry was poured into the metal mold and by die casting, and electromagnetic stirring samples were observed comparatively in microstructure. The results indicate that the temperature of AZ91D alloy melt is decreased to liquid-solid two phase zone to form lots of primary α（Mg） nuclei and uniform distribution in the liquid metal under the condition of enthalpy equilibrium rotating electromagnetic device , which is responsible for the spherical and equiaxed grain in the metal and die casting samples.关键词：Semisolid Slurry;AZ91D;Enthalpy Equilibrium;Microstructure;Electromagnetic Stirring
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发布时间：2023-12-18 - 摘要：<正>以前,我公司生产的精密铸造碳钢件,因热处理氧化脱碳,铸件表面形成一层厚厚的氧化皮,抛丸时间增长,曾造成抛丸过度、铸字模糊,甚至铸件尺寸变小等废品。后来,采用装桶密封的方法,铸件表面质量有所改善,但力学性能不合格率高达17%,分析原因是铸件装在壁厚为3mm的不锈钢板桶中,还按原保温时间,铸
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发布时间：2023-12-18 - 摘要：The dimensional accuracy of turbine blade affects yield of turbine blade directly, while the casting process parameters have great effect on the accuracy of turbine blade size. Based on the simulation software ProCAST, the effects of the withdrawal velocity, pouring temperature, mould preheating temperature and the cold copper temperature on turbine blade dimensions were analyzed by single factor experiment, and the processing parameters were optimized by combining the orthogonal test with the BP neural network. Finally, the practical pouring experiment was conducted to verify the avaibility of the method.关键词：ProCAST;Orthogonal Test;Neural Network;Optimization of Process Parameters
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发布时间：2023-12-18 - 摘要：Influences of smelting purification and casting conditions on the microstructure of low frequency electromagnetic semi-continuous casting heat resistant rare earth magnesium alloy Mg-（4～5）Al-（1～2）Ca-（0.3～0.6） Mn - （0.5～0.7）RE （AC52） were investigated. The results show that magnesium alloy melting furnace with the stainless steel net as filter can improve greatly the purity of the melt. Under the condition of 30 Hz, with the current intensity of 60 A and casting speed of 165 mm/min, the uniform microstructure with fine grain can be observed in the AC52 magnesium alloy. Meanwhile, the difference of grain size between the outer and heart can be neglected, and obvious segregation is absent.关键词：AC52 Alloy;Melting Filter;Low Frequency Semi-Continuously Electromagnetic Casting;Microstructure
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发布时间：2023-12-18 - 摘要：Influences of Nd additions on the microstructure and dry sliding wear behaviors of cast Al-Mg2Si in situ metal matrix composites were investigated. The results show that the addition of proper Nd addition has significant modification effect on both primary and eutectic Mg2Si in the Al-15 Mg2Si composites. The morphology of primary Mg2Si is changed from dendritic to polyhedral shape and the eutectic Mg2Si from flake-like to very short fibrous or dot-like, and their average particle sizes are significantly decreased also. The wear rates and friction coefficient of the composites with Nd are lower than those without Nd, and the addition of 0.5%Nd changes the wear mechanism of the composite from the combination mechanism of abrasive, adhesive and delamination wear without Nd into single mild abrasion wear.关键词：Mg2Si/Al Composites;Nd;Modification;Primary and Eutectic Mg2Si;Wear Behaviors
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发布时间：2023-12-18 - 摘要：The Al-10Si-15Mg2Si composites were fabricated by centrifugal casting. The wear resistance of the reinforcement layer of the composites un-corroded and corroded in 10% NaOH solution at varied time was examined. The results show that the weight loss of the reinforcement layer is decreased firstly and then increased with the increase of corrosion time. The influence mechanism of corrosion pre-process on the wear resistance of the composites was described.关键词：Corrosion Pre-Process;Wear Resistance;Mg2Si/Al Composites;Centrifugal Casting
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发布时间：2023-12-18 - 摘要：<正>2012年12月5日,在苏州工业园金鸡湖畔,召开了迈格码第八届中国地区用户大会,来自中国110家客户中40多家代表企业120人参加了本次会议。迈格码（苏州）软件科技有限公司总经理余永吉做了致词。他表示,本次会议主要是感谢用户对迈格码的支持,并将迈格码的新版本5.2版介绍给大家。亚太地区总裁Kleeberg先生介绍了最先进的工艺模拟,并将亚太地区的同事介绍给各位用户。迈格码中国的
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发布时间：2023-12-18 - 摘要：<正>主办单位:中国有色金属工业协会中国投资协会协办单位:中国投资协会大中型企业投资专业委员会江西铜业集团公司（确认中）支持单位:上海期货交易所执行单位:北京科莫迪投资咨询有限公司会议时间:2013年5月10-11日
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发布时间：2023-12-18 - 摘要：Effects of manganese on heterogeneous nucleation and grain refinement of Mg-3Al alloys with carbon inoculation were investigated by using ICP, SEM and EDS, and so on. As-cast microstructure of the Mg-Al alloy after and before Mn addition was observed. The results show that the addition of Mn element can refine effectively the grain size in Mg-3Al alloys. The average grain size of primary Mg in the Mg-Al alloy can be refined to about 66 μm with 0.32% Mn addition. However, the grain size is coarsened with further increasing in manganese content. It is found that small rod-like or particle AlMn phases, which can act as possible nucleating substrate of primary Mg grain, is formed with the Mn content lower than 0.32%. With increasing in Mn content, supersaturated Mn and Al elements can react with Al4C3 and Al-C-O particles in the melt and subsequently large cross petal-like Al-Mn-C-O phases are formed, leading to the coarseness of primary Mg grain as a result of the decrease of effective heterogeneous nuclei.关键词：Magnesium Alloy;Mn;Heterogeneous Nucleation;Carbon Inoculation
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发布时间：2023-12-18 - 摘要：Effect of different Sn additions on microstructure and mechanical properties of as-cast Mg-6Zn-0.7Zr alloys were investigated by XRD （X-ray diffraction）, SEM （scanning electron microscope）, EDS （energy dispersive spectrum） and tensile testing. The results show that Sn exists in the Mg-6Zn-0.7Zr alloy in form of three types: dissolved in α-Mg matrix, formed Mg2Sn phases, and existed in the MgZn phase. The addition of Sn can refine the divorced MgZn eutectics. However, the increase of Sn leads to the coarseness of α-Mg dendritic, which indicates that magnesium alloys containing Sn are not suitable for the addition of Zr element. A minor addition of Sn can improve the tensile strength of as-cast Mg-6Zn-0.7Zr alloy. The tensile strength and elongation of Mg-6Zn-0.7Zr-0.5Sn alloy reach 242 MPa and 17%, respectively. Fractographic analysis demonstrates that the brittleness of the alloy increases when the Sn content is over 3%. It is expressed as a large number of dissociation stepped surface and river pattern on the fracture surface.关键词：Mg-Zn-Zr Alloy;Sn;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：Ti35Zr30Be27.5-xCu7.5Cox（x=3.5,7.5,11.5, mole fraction） bulk amorphous alloys were prepared by copper mold casting method. The effects of Co content on the thermal stability were investigated using X-ray diffractometer（XRD） and differential scanning calorimeter（DSC）. The results show that the glass transition temperature（Tg）, the crystallization temperature（Tx） and the exothermic peak temperature （Tp） are shifted to the high temperature region with the increase of heating rate for Ti35Zr30Be27.5-xCu7.5Cox（x=3.5, 7.5, 11.5） bulk amorphous alloys,which shows that the glass transition and crystallization are characterized by kinetic processes.The activation energies of glass transition（Eg） and crystallization（Ex） are increased with Co content increases by the Kissinger method. The activation energies of glass transition（Eg） and crystallization（Ex） are 207.8 kJ/mol and 238.1 kJ/mol, respectively, for Ti35Zr30Be16Cu7.5Co11.5 bulk amorphous alloy.关键词：Ti-Based Bulk Amorphous Alloy;Thermal Stability;Kissinger Method
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发布时间：2023-12-18 - 摘要：After superplastic tensile deformation and double annealing heat treatment at different conditions, the effects of hot working technology on microstructure evolution of TC21 titanium alloy were investigated. The results show that at 890 ℃～960 ℃, the elongation of TC21 alloy is increased firstly and then decreased with the increase of deformation temperature. The optimal superplastic deformation temperature is 910 ℃. After superplastic deformation and double annealing treatment in α+β phase zone,the microstructure of TC21 alloy exhibits duplex structure. After superplastic deformation in quasi-β phase zone and double annealing treatment in α+β phase zone, basketweave structure can be observed in the microstructure of TC21 alloy.关键词：TC21 Alloy;Superplastic Deformation;Double Annealing;Microstructure
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发布时间：2023-12-18 - 摘要：Effects of different magnetic field intensity, pouring temperature and mold pre-heating temperature on solidification microstructure of Al-5Fe alloy were investigated by a self-developed pulsed magnetic field apparatus. The results show that solidification structure of Al-5Fe alloy can be refined effectively by controlling parameters of pulsed magnetic field and solidification conditions. Al3Fe phase is transformed from long coarse strip to fine acicula structurer. With the increase of pulse voltage in the range of 0～210 V, Al3Fe phase is refined gradually. In the range of 800 ℃～890 ℃, with the increase of pouring temperature, Al3Fe phase is refined firstly and then coarsened under magnetic field, and the desirable refinement of Al3Fe can be observed with pouring temperature of 860 ℃. With the increase of the mould temperature in the range of 200 ℃～800 ℃, Al3Fe phase is refined gradually with magnetic field treatment.关键词：Al-5Fe Alloy;Pulsed Magnetic Field;Solidification Structure
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发布时间：2023-12-18 - 摘要：Influence of DC electric current on maximal conductivity and aging rate of thermally aged Cu-0.86Cr alloy was investigated, and effects of the alloy traditionally aged without DC current were analyzed comparatively. In contrast with traditional condition, the maximal conductivity of the alloy aged with DC current is increased to 48.23 MS/m from 47.92 MS/m, meanwhile, DC electric current can enhance aging rate of the alloy, where the conductivity ratio of the alloy aged for 6h with and without current reaches its maximal conductivity of 98% and 94%, respectively. One reason of enhancing the precipitation can be attributed to the Joule heating due to self-electric resistance, on the other hand, electron wind force exerted by drift electron can promote the mobility of excess vacancies and dislocation, mass dislocation and clusters and pairs of vacancy, which offers the nucleation sites for the precipitation of solute atoms.关键词：Cu-Cr Alloy;DC Electric Current;Aging;Conductivity
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发布时间：2023-12-18 - 摘要：<正>五子登科镜（见下页）[1]明代（公元1368～1644年）直径10.5cm质量140g黄铜铸造上海博物馆藏"五子登科"出自后周时期（公元951～960年）窦禹钧（字燕山）教子有方,五个儿子先后考中进土的典故。这个故事后被录入宋代开始的儿童启蒙读本《三字经》中:"窦燕山,有义方,教五子,俱名扬。""五子登科"这一吉祥语在明代铜镜中常见,反映出科举制度对社会的影响程度
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发布时间：2023-12-18
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