最新刊期
      卷 ， 期 6 ， 2005
      • Gao Wenli~1 Zhang Hu~2 Wang Qun~1 Zeng Songyan~3 Chen Zhenhua~1
        Issue 6, Pages: 321-322(2005)
        摘要：The microstructure and phase constituent of TiB2/Ti-Al composites prepared by XDTM were investigated by XRD,SEM and TEM.It was found that there exists a flake convex facets with （0.2 μm） a lower than thickness whose length reached up to 4 μm on the surface in {1010} facets perpendicular to 〔0001〕orientation of TiB2 needles,and the orientation of the convex facets is parallel to that of TiB2 needles.TiB2 needles,which exists in cruciated or radicalized form,were dispersed at α2/γ lamellar matrix.The Al-riched and Ti-riched layers and heterogeneity in supersaturation solution at solid-liquid interface resulted from non-equilibrium solidification may keep solid-liquid interface stable to result in the formation of the structure characteristic of the TiB2 needles.  
        关键词：TiAl;TiB2;Ti Matrix Composites;Growth Mechanism   
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        发布时间：2023-12-18
      • Chen Ruirun Ding Hongsheng Bi Weisheng Guo Jingie Jia Jun Fu Hengzhi
        Issue 6, Pages: 323-325(2005)
        摘要：Aiming at liquid Ti alloy having reactive chemical properties,the electromagnetic casting technology for Ti alloy in cold crucible was investigated.The effects of processing parameters on the surface quality and microstructure of the billet were researched also.The results showed that drawing velocity has an obvious effect on the surface quality and macrostructure of the billet.Heat power significantly affects the surface quality,in turn slightly affects the macrostructure.The Ti alloy castings with smooth surface and once-through directional microstructure can be realized by optimizing the processing parameters.The formation mechanism of crack and structure defects during electromagnetic casting was investigated.The large round Ti alloy billet with smooth free crack and column crystalline can be obtained.  
        关键词：Cold Crucible;Electromagnetic Castings;Directional Solidification;Ti Alloy   
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        发布时间：2023-12-18
      • Wu Jianchun~1 Dong Yinsheng~1 Lin Pinghua~
        Issue 6, Pages: 326-327(2005)
        摘要：The as-cast microstructures of Zn-2.98Cu peritectic alloys with different cooling rates in various molds were investigated.The results indicated that the microstructure consists of ε phase and η matrix phase in sand mold and permanent mold,while it consists of directional ε phase and η matrix phase as well as lamellar （ε+η） phase in mold with directional temperature gradient.A further investigation for the lamellar microstructure is conducted.Average value between lamellar in obtained Zn-Cu peritectic alloy is 4.06 μm.  
        关键词：Cooling Way;Zn-Cu Peritectic Alloy;Microstructure   
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        发布时间：2023-12-18
      • Liu Hanlian Huang Chuanzhen Qin Huifang
        Issue 6, Pages: 330-332(2005)
        摘要：Hypereutectic Bi/Bi-Mn in-situ composites with ideal layer-separated and unidirectional growth structure can be prepared by a new solidification method,centrifugal unidirectional solidification,in the condition of proper rotating velocity of crucible and growth rate.The results showed that coarse fibrous MnBi compound was uniformly distributed into pure Bi matrix in internal layer of fracture.The mechanism of layer-separated growth and the factors influencing lay-er-separated were analyzed emphatically.  
        关键词：Centrifugal Unidirectional Solidification;Bi-Mn Alloy;Mechanism of Layer-separated Growth   
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        发布时间：2023-12-18
      • Le Qichi Cui Jianzhong Zhao Xiaohong
        Issue 6, Pages: 333-334(2005)
        摘要：In order to improve the quality of magnesium billets,magnesium melt for DC casting was purified by using stainless steel mesh in the magnesium melting furnace with bottom apex.The results showed that good purification effects can be obtained,in which not only major coarse impurity particles was removed but also shrinkage porosity was effectively abated.Purification improvement was observed in addition to reducing the oxidation tendency with low poured temperature.However,there exist poor effects in the initial stage and end period.  
        关键词：Magnesium Alloy;Melt Purification;DC Casting   
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        发布时间：2023-12-18
      • Han Jianfen Li Baomian Cui Jianzhong
        Issue 6, Pages: 335-336(2005)
        摘要：Morphology distribution of Cu,Mg,Sn,Si in Al-Sn-Si-Cu-Mg alloy was observed by Leica optical microscope and EPM-8100Q electron microscope,and the effects of processing ways on the mechanical properties of the alloy were investigated.It was found that the net distribution between Sn and Si grains in the alloy can be eliminated to improve the working performance by choosing pretreatment and annealing ways based on proposed high temperature and short-time annealing specification.  
        关键词：Al-Sn-Si-Cu-Mg Alloy;Bearing Materials;Short-time Annealing at High-temperature   
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        发布时间：2023-12-18
      • Ding Hengmin Liu Ruixiang Chen Liliang Liu Jingfeng
        Issue 6, Pages: 337-339(2005)
        摘要：Application of the Cellular Automaton model to simulating the solidification microstructure was approached based on its physical properties and numerical calculation method.The multi-dendrite growth of Al-4.5Cu alloy with equiaxed grain was simulated by means of the Cellular Automaton model.The simulated result is well in agreement with the experimental one.  
        关键词：Cellular Automaton;Model;Dendrite Growth   
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        发布时间：2023-12-18
      • Li Bin~1 Xu Qingyan~1 Li Xudong~2 Liu Baicheng~1
        Issue 6, Pages: 339-343(2005)
        摘要：Progress in both macro and micro numerical simulations of solidification of particle reinforced metal matrix composites was reviewed.A multi-phase field model coupled with mass,momentum,energy and solute conservation equation was introduced to apply for macro simulation.Critical velocity model for the micro simulation was given,and key factors were presented to accurate prediction of interaction of particles solidification interface and microstructure.The existing problems and development tendency in the field were pointed out also.  
        关键词：Particle Reinforced Metal Matrix Composites;Solidification;Macro-modeling;Micro-modeling   
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        发布时间：2023-12-18
      • Shi Hongjun~1 Yang Yitao~1 Sun Baoliang~2 Shao Guangjie~1
        Issue 6, Pages: 344-346(2005)
        摘要：The finite differential method was applied to develop a simulation software for solidification temperature field in continuous casting.By changing processing parameters,the temperature distribution in continuous casting was calculated to determine proper processing parameters for A356 aluminum cylinder.Based on obtained parameters,experiment of continuous casting were carried out.Measured curve of time-temperature,solid-liquid interface shape and position in experiment is well in agreement with that with simulated results.It was found that the software can be used to optimize processing parameters of aluminum alloy in continuous casting.  
        关键词：Continuous Casting;Aluminum Alloy;Solidification;Temperature Field;Simulation   
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        发布时间：2023-12-18
      • Pan Ye Zhang Chuan Zhang Yancheng Sun Guoxiong
        Issue 6, Pages: 347-349(2005)
        摘要：Al2O3-Cr and Al2O3-（Cr2O3）-Cr ceramic matrix composites were successfully prepared in ceramic mold and graphite mold by combustion synthesis.The effects of Al2O3 and Cr2O3 dilutor on initial reaction temperature and adiabatic temperature were investigated by thermodynamic calculation.It was found that the dilutor can improve initial reaction temperature and decrease adiabatic temperature.Al2O3 and Al2O3- Cr2O3 solid solution matrix composites can be prepared by changing the dilutor proportion,in which with proper dilutor,fine Cr phase with sub-micron size can be uniformly distributed in the Al2O3 matrix.The uniformity and fineness of microstructure of the composites in graphite mold are superior to those of in ceramic mold.  
        关键词：Composites;Combustion Synthesis;Al2O3;Microstructure   
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        发布时间：2023-12-18
      • Wang Xiaofeng Zhao Jiuzhou Liu Dongming Wang Jiangtao Chen Guiyun
        Issue 6, Pages: 350-353(2005)
        摘要：Particulate reinforced metal matrix composites （PRMMCs） have superior comprehensive mechanical properties,and are widely applied in aeronautical engineering,military and automobile industries.Great attentions have been paid to the investigation of the man-ufacturing of PRMMCs by the spray forming in recent years.It was indicated that the spray formed metal matrix composites have a dense microstructure and excellent mechanical properties.The present status and future tendency of the spray foring for PRMMCs were introduced.  
        关键词：Spray Forming;Particulate Reinforcement;In-Situ Reaction;MMCs   
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        发布时间：2023-12-18
      • Zhai Qiuya Yuan Sen Wang Zhimin Jiang Bailing
        Issue 6, Pages: 354-357(2005)
        摘要：The phase structure,microstructure of deformed AZ91 Mg alloy and their effects on the formation of semi-solid microstructure in SIMA were investigated.Deformed AZ91 Mg is composed of fine equaixed α-Mg phase and Mg12Al17 phase.There exist a great mount of sub-crystal with big angle and dislocation tangles with high density as well as lattice distortion in α-Mg matrix.Mg12Al17 phase,dislocation with high density as well as grain boundary with high distortion energy can be responsible for stress induced melting of semi-solid alloy,and the solute diffusion and liquid infiltration are dependent on the grain boundary and sub-grain boundary,which accelerate the melting and granularization of the semi-solid alloy.The semi-solid AZ91 Mg alloy with uniform distribution and spheroidal grain as well as 57% solid fraction can be obtained with heating temperature at 565℃ for holding time of 5min.  
        关键词：Deformed Mg Alloy;Dislocation;Semi-solid;Activation Melting   
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        发布时间：2023-12-18
      • Cheng Zhengwu Tang Jinglin Li Ke Li ShuangshouZeng Daben
        Issue 6, Pages: 357-360(2005)
        摘要：Reheating state and thixotropic behavior of semisolid hypoeutectic Al-Si alloy were investigated by the penetration method.Softness formula S*=KD/T was employed to describe the reheating state of the semisolid Al-Si alloy using some parameters,including the penetrated depth,penetrated time and load acting on the probe.The softness ranging from 183 to 500 was proper for the thixoforming behavior of the alloy.The change of penetrated depth of the probe was approached by analysis of experimental results.  
        关键词：Semi-solid;Reheating;Softness;Thixotropic Behavior   
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        发布时间：2023-12-18
      • Zhu Jinlun
        Issue 6, Pages: 361-362(2005)
        摘要：It was very difficult for high Cr cast Fe hollow ball valve in investment casting due to its internal hollow and full close as well as high crack susceptibility.Hollow ball valve body was successfully produced in investment casting by using drawing-formed thin-walled steel sheet with 2 mm thickness ball core instead of sodium silicate core or ceramic core.  
        关键词：High Cr Cast Iron;Hollow Ball Valve;Investment Casting   
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        发布时间：2023-12-18
      • Xu Lijuan Chen Ziyong Chen Yuyong Kong Fantao
        Issue 6, Pages: 363-365(2005)
        摘要：Ti alloy is a most perspective material for oralogy due to its excellent mechanical properties and erosion resistance as well as biology compatibility.The theory and technology of Ti castings for oralogy in investment casting were rapidly developed in recent years.The present status and development tendency of Ti casting for dentistry were surveyed from the view of Ti materials,machine and filling mold materials.  
        关键词：Cast Ti;Ti Alloy;Machine for Ti Castings;Filling Mold Materials   
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        发布时间：2023-12-18
      • Chen Bing
        Issue 6, Pages: 366-368(2005)
        摘要：Manipulator for shell making has experienced the developed stages from mechanical transmission to hydraulic transmission to high automation.The new-type manipulator developed abroad can not only operate fabrication of the coating slurry,and stucco but also possess the features of smooth operation for shell making and reliable use and low noise.The wide use of full closed drying system for shell mold and various rapidly dried sol silicate can greatly shorten the period of shell making,by which the higher shell quality with high efficiency and low consumption can be realized due to exactly control the temperature and humidity of the dry workshop.  
        关键词：Manipulator for Shell Making;Hydraulic Transmission;Shell Mold;Drying   
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        发布时间：2023-12-18
      • Tian Fuxiang
        Issue 6, Pages: 368-369(2005)
        摘要：The automatic screw thread unloading is a difficult point in the design of die casting die for castings with screw thread.A toothed rack was commonly adopted for the automatic screw thread rotational unloading.However a new mechanism,ball screw and gear,was adopted.The mechanism used the pushing bar of die-casting machine to offer the power for rotation of the mold ring with screw thread,and the mechanism of ball screw and gear changes the rectilinear movement to rotation of mold ring with screw thread,realizing the automatic screw thread unloading.  
        关键词：Die Casting Die;Ball Screw;Mold Ring with Screw Thread;Rotational Screw Thread Unloading   
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        发布时间：2023-12-18
      • Li Renjie Li Peijie Luo Yelang
        Issue 6, Pages: 370-371(2005)
        摘要：A die temperature controller which uses heating medium oil with high temperature to control the die temperature of magnesium was introduced.Aimed at the requirements of the die temperature control,the principle of the die temperature controller was introduced,and the design of key parts of the controller as well as the structure of the control system was described.The fuzzy control algorithm was employed to control on-off time ratio for heating and cooling to realize an optimized effect on the basis of the features of often replacement.The quality of magnesium alloy can be obviously improved by the equipment.  
        关键词：Diecasting for Magnesium Alloy;Die Temperature;Fuzzy Control;Heating Medium Oil   
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        发布时间：2023-12-18
      • Liu Chuansheng
        Issue 6, Pages: 372-374(2005)
        摘要：In order to meet the requirements of customers from the world for the batch production,quality and SPC of die casting,robots were used to take castings and to spray as well as to blow instead of mechanical manipulators.The hydraulic press for cutting die has been added.Full automatic die casting production system was realized by using the robots to control the die casting machine,hydraudlic press and die casting cycle.Design and control as well as the limitation of the system were described.  
        关键词：Die Casting;Robot;Die Casting Machine;Hydraulic Press;Mechanical Manipulator   
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        发布时间：2023-12-18
      • Lu Jintang Kong Gang
        Issue 6, Pages: 375-377(2005)
        摘要：Effects of cooling rate on eutectic microstructure of Zn-（0.24Ni） alloy for hot dip galvanization were investigated.Coarse,fine rod-like and divorced eutectic structures were formed respectively in the condition of furnace cooling,air cooling and water cooling in iron mold.The conditions forming lamellar,rod-like or divorced eutectic structure in the alloy were expounded.  
        关键词：Zn-Ni Alloy;Eutectic Structure;Cooling Rate   
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        发布时间：2023-12-18
      • Vol. 0, Issue 6, Pages: 377(2005)
          
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        发布时间：2023-12-18
      • Wan Nong~1 Dong Jianxin~2 Xie Xishan~2
        Issue 6, Pages: 378-380(2005)
        摘要：Quantitative calculation for microstructure of AlSi7Mg alloy under conservation condition was conducted by a thermo-calc thermodynamic software.Effects of chemical composition and temperature on the microstructure of the alloy were researched.The results showed that increase of Mg content can improve the amount and precipitated temperature of Mg2Si enhancement phase due to the fact that the precipitated temperature and amounts of Mg2Si enhancement phase are mainly dependent on Mg content.Amounts and enhanced effects of Mg2Si enhancement phase can be remarkably decreased with aging at over 200 ℃.The optimized solid solution temperature and aging temperature are 525～550 ℃ and 150～200 ℃ respectively through the thermo-calc software calculation,which is well in agreement with the existing experimental data.  
        关键词：AlSi7Mg Alloy;Microstructure;Thermodynamics   
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        发布时间：2023-12-18
      • Lin Qiquan~
        Issue 6, Pages: 381-383(2005)
        摘要：The compression creep behaviors of 2618 alloy with different compositions prepared by different smelting-casting methods were examined by Gleeble-1 500 thermal simulator.It was found that 2618 aluminum alloy exhibits a higher creep stress exponent.The creep behaviors of the alloy can be described by using threshold stress.The threshold stress of the alloy melt containing high Fe and Ni can be improved by elevated treatment and Zr,Mn alloying treatment.  
        关键词：Aluminum Alloy;Compression Creep;Elevated Treatment   
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        发布时间：2023-12-18
      • You Zhanping Liu Jinzhi Luo Yong
        Issue 6, Pages: 383-384(2005)
        摘要：The reason resulting in contraction cavity in top of 195T piston combustion chamber in practice was analyzed,and the countermeasures of eliminating the contraction cavity were taken.The product yield of 195T piston can reach up to 90% by using above mentioned countermeasures in practice.  
        关键词：T Piston;Mould;Contraction Cavity;Water-cooling Bottom Mould   
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        发布时间：2023-12-18
      • Vol. 0, Issue 6, Pages: 385(2005)
          
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      • Vol. 0, Issue 6, Pages: 386(2005)
          
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      • Vol. 0, Issue 6, Pages: 387-388(2005)
          
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      • Vol. 0, Issue 6, Pages: 389(2005)
          
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