最新刊期
卷 ， 期 9 ， 2006
- 摘要：Effects of heat treatment on micro-yield strength （MYS） of Al2O3-SiO2 /Al-Si metallic matrix composites （MMC） have been investigated by the continuously loading method. The results indicate that the composites possess the minimum micro-yield strength after quenched treatment. And the micro-yield strength of the composites treated by aging is superior to that of the composites treated by other methodes, which shows that aging is a greatly effective method of improving Al-Si matrix composites.关键词：Al-Si Metallic Matrix Composites;Micro-yield Strength;Alumina Silicate Short Fibre;Heat Treatment [HJ1.5mm]
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发布时间：2023-12-18 - 摘要：WE54 magnesium alloy （Mg-5.4Y-2.3Nd- 1.6 Gd-0.5Zr） exhibits distinct differences in microstructure, micro-area chemical compositions and mechanical properties treated in the different states including as-cast, solid solution （T4） and solid solution-artificial aging （T6）. The microstructure, precipitated phase and micro-area chemical composition of WE54 alloy have been analyzed by means of optical microscope （OM）, X-ray diffraction （XRD）, high-resolution scanning electron microscopy （SEM） and energy disperse spectroscopy （EDS）. The experimental results reveal that in as-cast WE54 alloy, two kinds of new phases Mg 12 Nd and Mg 24 Y5 with netlike structure are precipitated along the grain boundaries, and the heavy Re element Gd is dissolved into Mg matrix completely, and no precipitated phase containing Gd can be observed in the internal of grains or on the grain boundary. After treated by solid solution, the bulky precipitated phase distributed along the grain boundary in as-cast Mg alloy can be completely dissolved into Mg matrix, which promotes the improvement of the mechanical properties. After treated by solid solution-artificial aging （T6）, a large number of fine rare earth-rich precipitated phase is formed in the alloy. The lamellar precipitated phase is confirmed through analyzing the characteristics of precipitated phase in the sample in cross direction and longitudinal direction. The arrangement of these lamellar precipitated phases extends along three directions with mutual fixed angle of 120°, showing stricter orientation, which leads to the improvement of the strength and the decrease of the elongation of the WE54 alloy.关键词：WE54 Magnesium Alloy;Precipitated Phase;Microstructure;Micro-area Chemical Composition;Mechanical Properties
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发布时间：2023-12-18 - 摘要：Dynamic mechanical properties and fracture morphology related to adiabatic shear band formed in pure titanium TA2 have been observed by means of specially designed specimen in a Hopkinson pressure at high strain rate of 103 s -1 . Microstructure and fracture morphology of the specimens are observed by scanning electric microscope （SEM） and transmission electric microscopy （TEM）. The observation indicates that the material undergos uniform deformation at a low strain rate to symmetry uniform deformation in range of middling strain to asymmetry deformation at high strain before it is damaged. The materials are characterized by thermo-plastic disstability. The fracture morphology is characterized by tenacity pit and tenacity veins.关键词：Commercial Pure Titanium;Microstructure;Adiabatic Shearing Band;Damage
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发布时间：2023-12-18 - 摘要：Crystallization kinetics of mischmetal-based bulk metallic glasses MM 55 Al 25 Cu 10 Ni5Co5 has been analyzed by differential scanning calorimetry （DSC）. The results indicate that the crystallization behavior of the metallic glasses exhibit obvious kinetic effects. The local activation energy is rapidly increased to a peak value firstly, and then is gradually decreased with increasing in crystallized volume fraction, which is typical nucleation and growth mechanism, where nucleation is completed instantaneous and growth is dominant in crystallization. The apparent activation energies of the MM-based metallic glasses are superior to those of the La 55 Al 25 Cu 10 Ni5Co5 metallic glasses, showing higher thermal stability. Local Avrami exponents are calculated to be in the range of 3.22 to 5.23, which is a 3D nucleation and growth process. Crystallization transformation behavior is dependent on crystallized volume fraction and crystallized temperature.关键词：Mischmetal;Bulky Metallic Glasses;Crystallization Kinetics;Activation Energy;Crystallization Mechanism
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发布时间：2023-12-18 - 摘要：An in-situ observation instrument for crystal growth was developed, which was composed of a sandwich-like crystal growth cell, circulation system of hot water and a light path based on flowing visualization method designed to match the crystal growth cell. The morphological transformation from dendrite to cells has been demonstrated by in-situ observing the growth process of SCN analogue alloy in rapid solidification with different temperature gradients. It is found that the tip splitting of the dendrite can result in the coalesce of side-dendrite and the sharp decrease of first arm spacing. The theoretical approach to evolving mechanism of the tip splitting is conducted also.关键词：Crystal Growth;In-situ and Real-time Observation;Succinonitrile （SCN）;Tip Splitting
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发布时间：2023-12-18 - 摘要：An experimental schematic for examining effects of modification on surface tension of ZL102 Al-Si alloy is designed to establish a mathematical model by the regression orthogonal method, and the surface tension of ZL102 Al-Si alloy melt is measured in the front of the furnace by self-developed rapidly measuring surface tension apparatus. The results show that the influencing orders on surface tension of the ZL102 Al-Si alloy are modifier addition, then modification time, then modification temperature, then interactive phase and secondary phase can be ignored. The calculated results are well in agreement with measured ones.关键词：Modification;Surface Tension;Mathematical Model;ZL102 Al-Si Alloy;Regression Orthogonal Design
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发布时间：2023-12-18 - 摘要：Improvement of temperature-measuring and slag-combing for smelting process in main frequency furnace is conducted based on practical production. Temperature of the liquid steel and whether the slag exists in the surface can be identified through analyzing the surface image during smelting processing based on the digital image treatment technique. The terminus of melting process is determined by controlling robots to comb slag and by controlling input power of the main frequency furnace to realize the temperature-increasing and holding of the liquid steel. The application of the system can greatly improve the automatic level of smelting process.关键词：Digital Image Processing;Temperature;Control
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发布时间：2023-12-18 - 摘要：Using the macro-microcosmic coupling method, a combinative macro-microcosmic model （direct difference-cellular automaton model, that is CA-DD model） has been established to simulate effects of various processing parameters on the shape of solid-liquid interface and crystal competitive growth of pure Cu in heated mould continuous casting. The results show that with the increase of drawing velocity, the position of solid-liquid interface moves from the inner to the outer of the mould, and the competition of crystal is wore off. Mould temperature has the obvious effects on the competitive growth of the crystal.关键词：Heated Mould Continuous Casting;Microstructure;Cellular Automaton
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发布时间：2023-12-18 - 摘要：Aiming at die casting die with inclined side direction core-pulling, a mathematical model of core-pulling mechanism suitable for practical production has been established based on fuzzy reliability optimal design, in which optimal level assembly and method of compound shape are adopted. The practical production verifies that the method can not only ensure reliability and safety of the core-pulling mechanism, but also reduce cross-section of pin, which is favorable for saving die area and reducing the cost.关键词：Inclined Core-pulling;Die Casting Die;Fuzzy Reliability;Optimal Design
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发布时间：2023-12-18 - 摘要：Microstructure and wear behavior of Al-Si-Fe alloy prepared by semi-solid squeezing casting have been analyzed. The results show that the alloy possesses fine and uniform microstructure and excellent wear resistance in which slide and abrasive wear are dominant in the wear behavior. The higher the squeezing ratio is, the better the wear resistance is. The weight loss of alloy is 50.98% of that of as-cast alloy under the condition of dry friction, while is 57.77 %of that of ones under the condition of lubricant conditon.关键词：Semi-solid;Al-Si-Fe Alloy;Friction and Wear
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发布时间：2023-12-18 - 摘要：Microstructure, mechanical properties of AZ91D-RE-xCa Mg alloy extruded tube at ambient and high temperatures were investigated. It was revealed that the mechanical properties of the alloyed Mg alloy extruded tube at a high temperature can be significantly improved. The optimized mechanical properties of the Mg alloy extruded tube with 0.5% Ca content, including tensile strength of 225.2 MPa, yield strength of 179.3 MPa and elongation of 5.3%, at a high temperature of 200 ℃ can be obtained , which is superior to those of AZ91D Mg alloy extruded tube at the same experimental conditions.关键词：Mg Alloy;Mistchmetal;Ca;Properties at High Temperature
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发布时间：2023-12-18 - 摘要：Die casting-forging processing has integrated the advantages of die casting with forging, which not only can control the shape and dimension, but also can greatly improve the strength due to the elimination of gas-hole and porosity in die castings arising from the plastic deformation in forging. In addition, the strength of die casting-forging parts can be increased by heat treatment. The die casting-forging processing is suitable for producing automobile parts with complicated shape and high strength as well as other structure components. The die casting-forging method and the properties of the parts have been introduced.关键词：Die Casting-forging Method;Engine Housing;Die Structure
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发布时间：2023-12-18 - 摘要：The object-oriented knowledge expression was applied to design the CAD system of die casting die, in which the attributes, processing and heuristic knowledge of designed object were uniformly expressed by object structure. The domanial knowledge of die design are organized through multi-ply inheritage. Based on the knowledge system, an intelligent CAD system has been developed.关键词：Object Oriented;Knowledge Expression;Die-casting Die;Intelligent CAD
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发布时间：2023-12-18 - 摘要：In order to solve the problems in gracile conical tube casting requiring overlong core-pulling distance and difficult mould-release, a die casting die with a special core-pulling mechanism has been designed. Pin-floating slider mechanism were adopted in the die, which can make the floating slider not only move along the drawing-core direction but also float along the pulling direction. Firstly, pin-floating slider mechanism performed short-distance drawing-core, and then the pulling-mechanism drives the slider and core along pulling castings direction to pull out the castings from the moving container, which greatly reduce mould-opening distance and production cost, and can improve product efficiency. The die can successfully produce the castings with no mark and high quality defects. The processing characteristics of tube was analyzed, and the structure design and operation of die casting die were approached in detail.关键词：Die Casting Die;Pin-floating Slider Mechanism;Conical Tube Castings;Core-drawing Mechanism
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发布时间：2023-12-18 - 摘要：The develoment of die casting die CAD system for drag-chain has been completed based on secondary development of Pro/E software using Pro/Toolkit aiming at the chararcteristics of die casting die for drag chain.The systematic analysis and structure in the system have been expounded.The production verifies that the CAD system has the better effects.关键词：Drag-Chain;Die Casting Die;CAD
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发布时间：2023-12-18 - 摘要：The processing features of oxidization resistant steel in investment casting were expounded. Pouring-shell ratio principle has been proposed to overcome crack, shrinkage porosity （hole ） in thin-walled parts through controlling processing parameters, including the baking temperature, holding temperature, holding time and pouring temperature as well as temperature of liquid steel, which can increase thermo-strength ability and corrosion resistance ata high temperature as well as postponing the service life of oxidized resistant steel parts ata high temperature.关键词：Oxidized Resistant Corrosion at High Temperature;Pouring-shell Ratio;Baking Temperature
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发布时间：2023-12-18 - 摘要：Effects of mechanical vibration on microstructure and mechanical properties of AZ91D magnesium alloy in lost foam casting have been investigated, and its vibration refinement mechanism is understood. The results show that mechanical vibration can significantly refine the as-cast microstructure of the AZ91D magnesium alloy to improve the mechanical properties. The maximum tensile strength can be obtained with the vibrated force of 1.5 kN. With the further increase of the vibrated force, the tensile strength of the Mg alloy can be somewhat decreased arising from the formation of micro-porosity in the microstructure.关键词：Lost Foam Casting;Magnesium Alloy;Mechanical Properties;Microstructure Refinement
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发布时间：2023-12-18 -
Fabrication of a High-density Fine-grain P/M Titanium Alloy by Mechanical Alloy and Vacuum Sintering
摘要：A high-density fine-grain P/M titanium alloy of Ti-6Al-2Sn-4Zr-6Mo was prepared by mechanical alloying and vacuum sintering process. Effects of ball-milling time and sintering temperature on density and microstructure of the P/M titanium alloy have been investigated. The experimental observation shows that with increasing in ball-milling time, the density of Ti alloy is increased and its microstructure is converted from primary α phase and needle-like β phase into fine equiaxed α+β phase, in which the grain size is decreased gradually. The relative density of sintered materials with average grain size of only 2 μm reaches 99.1% with ball-milling time of 40 h and sintering at 1 200 ℃.关键词：Fine Grain Ti Alloy;Mechanical Alloying;Vacuum Sintering- 2
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发布时间：2023-12-18 - 摘要：Q235-SiCp surface wear-friction composites have been prepared by compound electroplate processing. The effects of concentration of SiCp in plating solution, current density, average pH and temperature of plating solution on microstructure and properties of the electroplated layer were investigated. The results show that the dry friction coefficient of electroplated layer is in the range of 0.550.60,and its wear rate is less than 0.42×10 -7 cm3/J with the concentration of 35 g/L of SiCp in plating solution and current density of 3.5 A/dm2, which can meet the requirements of friction materials.关键词：Compound Electroplate;SiCp Particle;Friction Layer
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发布时间：2023-12-18 - 摘要：The different volume fractions of TiC particle reinforced 7075 aluminum matrix composites under the conditions of semi-solid state have been fabricated by the in-situ reactive liquidus method. The as-cast microstructure of the composites have been observed by OM （optical microscope） and TEM （transmission electron microscope）, and effects of TiC particle on the microstructure of the composites were investigated by measuring the average grain size with a mean linear intercept method. The result showed that TiC particle can obviously refine and spheroidize the as-cast microstructure of semi-solid Al matrix composites. The equaixed structure with average grain size of 35.6 μm in the composites can be observed with 2.5% TiC particle.关键词：Liquidus Casting;Semi-solid;Al Matrix Composites;Microstructure;In-situ Particle
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发布时间：2023-12-18 - 摘要：The microstructure characteristics and refining ability of Al-Ti-C master alloy prepared by liquid-solid reaction were investigated by SEM and TEM, and the liquid-solid synthesized mechanism was analyzed from the view of thermo-kinetics also. The results indicate that the microstructure of the Al-Ti-C master alloy is composed of dendritic TiAl3 phase and particle TiC, where TiC belongs to non-stoichiometric ratio compound in the form of TiCx, for x of 0.50.8, whose lattice contant is 0.4300.433 nm. The master alloy can obviously refine microstructure of the Al alloy, which is resulted from the occurrence of instantaneous high temperature in the interface of liquid-solid meet the thermal-kinetics conditions of Ti and C reaction during liquid-solid reaction. The formation of Al-Ti-C master alloy belongs to the solution-precipitation mechanisms, which consists of three groups of primitive reactions.关键词：Al-Ti-C Master Alloy;Liquid-solid Reaction;Refining Ability;Synthesized Mechanism
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发布时间：2023-12-18 - 摘要：The changes in button ingot mass of pure Ti, pure Al, TiAl binary alloy and TiAl-Nb ternary alloy after PAM have been observed with the same vacuum degrees. The observation reveals that while the mass loss of pure Ti is great at the first melt and then the mass tends to be unchanged, the change in mass of pure Al is decreased with increasing remelting times after PAM, which demonstrates that the evaporation of Al is mainly responsible for the mass loss of the alloy during PAM. The mass loss of Al in the alloys is slightly higher than that of other elements due to the higher superheat degree of Al element with melting binary TiAl alloy and TiAl-Nb ternary alloy at the same parameters, in which the mass loss of the Al increase with increasing the remelting times and Al content. The mass losses of TiAlNb alloy prepared with different raw materials （pure Nb strip or Nb-Al master alloy） are different, where the mass losses of the ternary alloy prepared with pure Nb is higher than that of one prepared with Nb-Al master alloy. The mass of the TiAlNb alloy would tend to be stable after 6 remeltings, whose relative mass loss is only 0.33%, lower than that of Al in other remelting methods.关键词：TiAlNb Alloy;PAM;Mass Change
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发布时间：2023-12-18 - 摘要：Effects of C2Cl6 on the as-cast microstructure and mechanical properties of AZ91 magnesium alloy have been investigated by optical microscope （OM）, X-ray diffraction analyzer （XRD） and scanning electron microscope （SEM）, and the grain size and grain area have been measured using the Imagetool Software. The results show that 0.3%0.8% C2Cl6 addition in the AZ91 magnesium alloy can obviously refine the grain average size of α-phase from 106 μm to about 53 μm and decrease the grain area, where the best refined effects can be observed with 0.3% C2Cl6 addition. In addition, C2Cl6 addition can result in the dispersive distribution of fine β-Mg 17 Al 12 phase, which can greatly improve the mechanical properties of the alloy.关键词：AZ91 Magnesium Alloy;C2Cl6;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：How to resolve inadequate feeding channel of some conventional parts has been approached by designing casting processing for cone axle Cu sleeve. Five kinds of casting processes for cone axle Cu sleeve were conducted by properly increasing the wall-thickness of the parts based on the solidification simulation method. Practical verification shows that partial wall-thickness-addition for casting mold can not only ensure good ingot quality and low assemble cost, but also obtain convenient operation and short production period.关键词：Cu Alloy;Cone Axle Sleeve;Processing Design;Solidification Simulation
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发布时间：2023-12-18 -
- 摘要：The wettability of SnAgCu solder containing low Ag on surface mount component and Cu substrate has been investigated by the wetting balance method with commercial water-soluble flux. The experimental results show that the highest wetting force and the biggest spreading area as well as the smallest wetting angle can be obtained with 2.5% Ag content, which can fully meet the wettability requirement of surface mount component due to its wetting force higher than that of commercial Sn3.8Ag0.7Cu alloy solder.关键词：Lead-free Solder;Surface Mount Components;Copper Substrate;Wettability;Wetting Force
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发布时间：2023-12-18 - 摘要：李庆春先生是我刊首届编委会主任,他为《特种铸造及有色合金》杂志的创办做了大量工作,为《特种铸造及有色合金》杂志的发展作出了杰出贡献。26年来,由创刊时的季刊,到后来的双月刊,再到今天的月刊,我刊的面貌发生了巨大的变化。时至现在,我刊不仅在国内有了很高的知名度和权威性,而且在国际也有了一定的影响力。所有这些,都凝聚着李庆春先生的一份宝贵心血。回首过去,不忘奠基人;展望未来,谨记先辈教悔。我们在为李庆春先生献上良好祝愿的同时,正满怀信心地在为《特种铸造及有色合金》杂志进一步发展的道路上开拓前进。我们深信,把《特种铸造及有色合金》杂志办成更富生命力的期刊精品,是对李庆春先生的最好回报。
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发布时间：2023-12-18 - 摘要：<正>第十一届全国特种铸造及有色合金学术年会、第五届全国铸造复合材料学术会议、第十二届全国铸钢及熔炼学术年会、中国有色金属加工工业协会重有色分会技术交流会于2006年8月12日至16日在中原重镇——郑州隆重举行。会议由中国机械工程学会铸造分会特种铸造及非铁合金专业委员会、复合材料专业委员会、铸钢及熔炼专业委员会、中国有色金属加工工业协会重有色分会、郑州大学、《特种铸造及有色合金》杂志社主办,《特种铸造及有色合金》杂志社和郑州大学承办,河南省铸造学会、河南省物理学会、登封电厂集团铝合金有限公司、宁波铝台精机有限公司协办。会议收到学术和技术论文160篇,由《特种铸造及有色合金》杂志社编辑、出版了论文集。来自中国内地26个省、市、自治区的180名代表出席了本次会议。会议得到郑州大学以及登封电厂集团铝合金有限公司、宁波铝台精机有限公司的大力支持和资助,为会议的顺利召开作出了重要贡献。在热烈的气氛中,会议于8月13日上午举行了开幕式。中国工程院院士、哈尔滨工业大学教授、西北工业大学教授傅恒志出席了开幕式。中国机械工程学会铸造分会复合材料专业委员会主任、东南大学教授吴申庆,中国机械工程学会铸造分会铸钢及熔炼专业委员会主任、吉林大学教授姜启川,《特种铸造及有色合金》杂志主编袁振国主持开幕式,中国机械工程学会铸造分会特种铸造及非铁合金专业委员会主任、哈尔滨工业大学教授郭景杰致开幕词,郑州大学校长、教授申长雨致欢迎词,上海大学校长助理翟启杰、中国有色金属加工工业协会重有色分会副会长杨勇、登封电厂集团铝合金有限公司副总经理杨明生、宁波铝台精机有限公司总经理龚四清在会上讲了话。开幕式结束后,进行大会学术交流。首先走上演讲席的傅恒志院士作了题为“凝固科学技术面临的挑战”的报告,介绍了当前凝固材料体系的基本框架和凝固科学技术主要发展阶段的基本理论,受到与会代表的一致赞誉。随后在8月13日和14日大会上演讲的有:东南大学教授吴申庆、吉林大学教授姜启川、清华大学教授李言祥、山东大学教授边秀房、郑州大学教授关绍康、中国有色金属加工工业协会铜业部主任王碧文、中南大学教授田荣璋、重庆大学教授龙思远、哈尔滨工业大学教授李邦盛、中国兵工学会挤压铸造专委会主任、兵科院宁波分院研究员齐丕骧、吉林大学教授赵宇光、上海大学教授翟启杰、华中科技大学教授陈立亮、中科院金属所研究员赵九洲、大连理工大学教授李廷举、北京交通大学教授邢书明、中国铸造协会艺术铸造专委会主任谭德睿、郑州大学教授刘忠侠、哈尔滨工业大学教授苏彦庆、华中科技大学教授严有为、暨南大学教授李卫、东南大学教授潘冶、上海大学教授毛协民、福州大学教授傅高升等25位专家和清华大学博士刘源、汤彬等在大会上作了报告。这些报告从多个角度,介绍了特种铸造及有色合金、复合材料、铸钢及熔炼领域的最新成果和前沿技术,内容丰富,精彩纷呈,获得了代表们的高度评价。8月14日上午,在轻有色、铸钢和重有色、特铸、复合材料和半固态加工4个分会场,全面展开了学术交流和技术交流,60多位代表宣读了论文。一批工厂作者如大连船用推进器厂何大川、戴卡轮毂制造有限公司武汉琦、宫林松、重庆建设集团王公平、北京星航机电设备厂魏芳、上海万泰铝业有限公司刘庆德、四川莱特新材料科技有限公司唐生渝、南阳二机石油装备集团有限公司赵旭平、广东鸿图科技有限公司刘后尧、湖北3611机械厂卢功辉、承德司达石油装备开发公司李延东、内蒙古北方重工业集团郭凌、中铝洛阳铜业有限公司梅恒星、余学涛、张敬华、海亮铜加工集团聂勇、沈阳造币厂赵峰、张启臣、沈阳有色金属加工厂张洪、陕西精密金属集团张御天、高新张铜有限公司李跃群、金龙集团仓环铜业有限公司郭莉、江苏万宝铜业集团钟致政等的论文引起了关注。代表们涌跃发言,相互探讨,气氛热烈。8月14日下午,全体代表兴致勃勃地参观了郑州大学材料物理教育部重点实验室和橡塑模具国家工程研究中心,对郑州大学在材料物理和橡塑模具领域的先进研究装备、仪器仪表设施以及取得的一系列研究成果表示赞赏和钦佩。会议期间,8月13日和14日两个晚上,分别举行了中国机械工程学会铸造分会特种铸造及非铁合金专业委员会、复合材料专业委员会、《特种铸造及有色合金》杂志编委会的委员会议。经过代表们的共同努力,会议取得圆满成功。这次会议,将特种铸造及非铁合金专业委员会、复合材料专业委员会、铸钢及熔炼专业委员会三个专业委员会的年会和中国有色金属加工工业协会重有色分会技术交流会合在一起召开,是一次高水平的学术交流和技术交流会议,也是对近年来中国在特种铸造、有色合金、复合材料、铸钢及熔炼等方面科技成果的一次大检阅。凝固科学技术方面,回顾了从液固相变形核理论、晶体界面生长动力学理论、成分过冷理论、界面稳定性线性动力学理论、共晶生长理论、枝晶生长边缘稳定性理论、快速凝固晶体生长理论的建立,到现在的凝固理论体系的形成过程,介绍了优质铸件铸造过程与凝固组织模拟、定向凝固、快速凝固、深过冷凝固、电磁场凝固、空间凝固、高压凝固等典型凝固技术,以及各种新型和超
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发布时间：2023-12-18
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