最新刊期
卷 ， 期 1 ， 2004
- 摘要：Some research achievements of immiscible alloy preparation with dispersed and homongeneous phase structure under micro-gravity and gravity environment have been summarized. The various effective factors on solidification of the immiscible alloy including nucleation, growth-diffusion-convection/diffusion, deposition and floatation due to gravity interfacial energy, Ostwald ripping, Marangoni motion, Brownian coagulation, the content of second phase and cooling rate are pointed. The unidirectionally solidified microstructures of the alloy are evolved from regular fibrous compound structure to regular array of in-droplets and then to random dispersion of in-droplets in the matrix. The varieties of preparation technology, including powder metallurgy, uni-directional solidification, simulated casting method under microgravity condition, stirring casting, rapid solidification, have been introduced based on the solidification characteristics. Meanwhile, the application of computer simulation for immiscible alloys including the dynamic density method, discrete particle method and phase field method has been shown. The problems and the future orientation in immiscible alloys have been also pointed out.关键词：Immiscible Alloys;Preparation Technology;Microstructural Simulation
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发布时间：2023-12-18 - 摘要：Metal/gas eutectic directional solidification （GASAR） is an new technology for the preparation of regular porous metal with directional array pore（Gasarite）. The principle and developing status of the technology were reviewed. The structure and property characteristics of the regular porous metal and its application were introduced. Meanwhile, the research progress was introduced also.关键词：Metal/gas Eutectic;Directional Solidification;Porous Materials
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- 244
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发布时间：2023-12-18 - 摘要：The functions of digitized method in reforming conventional casting techniques, especially the meaning and advantages of rapidly digitized manufacturing of metallic components, were expounded. The results showed that the digitized casting with greatly technological flexibility for the metallic components can realize partial functions of visual casting. Digitized casting based on rapid prototyping greatly shortened the productive period of metallic components from two months to a week, possessing marvelous advantages in rapid response to market demand.关键词：Digitized Manufacturing;Rapid Casting;Metallic Components;Rapidly Prototyping
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- 165
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发布时间：2023-12-18 - 摘要：Attention is paid to expound the developing tendency of Mg alloy materials and the forming technology based on the introduction of Mg alloy characteristics and research brief. Some important aspects of developing tendency of Mg alloy were given.关键词：Mg Alloy;Developing Tendency;Forming Technology
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发布时间：2023-12-18 - 摘要：The roles of alloying and trace elements in die-casting Al,Mg,Zn and Zn-Al alloy and its research progress were surveyed. The problems in further developing die-cast alloy were analyzed.关键词：Al Alloy;Mg Alloy;Zn Alloy;Die-casting Alloys;Alloying Element
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- 513
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发布时间：2023-12-18 - 摘要：Effects of the Ag-1Cu melt super-heat treatment on crystallization orientation in plane interface at various growth rates are investigated. It is found that the melt at high super-heated temperature is responsible for the branching to orientation of plane single crystal. The formation mechanism of orientation branching is analyzed by Leonard-Jones potential energy and cluster theory. It is showed that the distribution of cluster in primary phase plays important role for crystallization orientation.关键词：Crystallization Orientation;Branching;Cluster;Melt Super-Heat Treatment
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- 143
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发布时间：2023-12-18 - 摘要：The ribbon of Al 85 Y 4Nd 4Ni 7 amorphous alloy was prepared by rapid solidification in melt-spinning. The alloy obtained was analyzed by means of DSC and X-ray diffractometry （XRD） as well as the micro-hardness measurement （Hv）. The results showed that the amorphous crystal and supersaturated α-Al phase coexisted in the chilled alloy. The amorphous crystal transformed into nano-Al crystal and ternary metastable AlNiY and AlNdNi during annealing at 310 ℃. The metastable phases partially transformed into binary equilibrium phases Al 3Ni and Al 3Nd duringr annealing at 340 ℃ and 400 ℃. The micro-hardness values of the alloy were almost the same during annealing at 310 ℃ and 340 ℃,which were much higher than that of the alloy in chilled state, while decreased dramatically during annealing at 400 ℃, owing to the growth of the crystal.关键词：Rapid Solidification;Amorphous Crystal;Al-Y-Nd-Ni Alloy;Crystallization Behavior
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- 114
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发布时间：2023-12-18 - 摘要：The 7075 Al alloys were solidified under DC or AC magnetic field with magnetic density 0.06 T respectively. The liquidus and solidus temperatures of the alloy at different conditions were determined by recording resistance-temperature curves during solidification. The results showed that the liquidus and solidus temperatures of the alloy decreased from 630 ℃ to 627.5 ℃and from 520 ℃ to 510 ℃ respectively with widened solidification interval in DC magnetic field while both the liquidus and solidus temperatures of the alloy increased by 7.5 ℃ and by 10 ℃ respectively with narrowed solidification interval in AC magnetic field.关键词：Magnetic Field;Resistance;Liquidus;Solidus
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- 277
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发布时间：2023-12-18 - 摘要：The effects of instantaneous components of traveling electromagnetic force in Al alloy melt during casting process for thin-walled sample on surface quality of the casting were analyzed theoretically. The results showed that the roughness of the casting rose with increase in magnetic induction intensity, especially in making option of metallic cope. The periodically pulsating electromagnetic force appears in Al alloy melt due to applying 3 phase non-equilibrium current to electromagnetic inductor, especially in the case of the magnetic force perpendicular to the direction of magnetic field with larger pulse amplitude. It is believed that the pulse electromagnetic force perpendicular to direction of magnetic field is responsible for the surface fluctuation of the melt and surface roughness deterioration of solidified casting.关键词：Traveling Magnetic Field;Electromagnetic Force;Mold Filling;Surface Roughness;Al Alloy Castings
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- 172
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发布时间：2023-12-18 - 摘要：The serious contact corrosion occurred in AZ91 Mg alloy coupled with A3 steel in aqueous NaCl solution, locating near contacted place of the Mg alloy coupled with A3 steel. The average pit depth and corrosion mass-loss of the Mg alloy increase with increase in NaCl concentration and extending over dipping time. The corroded products mainly consist of Mg（OH） 2, MgCO 3 and Mg 2Al 2O 4. The corroded second phase Mg 17 Al 12 has been detected due to matrix corrosion in corroded products too.关键词：AZ91 Mg Alloy;Aqueous NaCl Solution;Contact Corrosion;Piont Corrosion;Corrosion Mass-loss
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- 224
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发布时间：2023-12-18 -
- 摘要：The Zn-Al alloy matrix composites were prepared by high-intensity ultrasonic dilution of XD denoted in situ composites. The experiment showed that the tensile strength of the composites with particles of homogeneous distribution in the matrix was much higher than that of the matrix. The strengthening mechanism was attributed to Orowan theory. The evenly diluted strengthening phase of XD composites by high-intensity ultrasonic resulted from the cavitation in association with acoustic stream.关键词：Ultrasonic Dilution;Tensile Strength;Cavitation;Acoustic Streaming
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- 118
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发布时间：2023-12-18 - 摘要：The optimum processing parameters were determined based on simulation of temperature field of Mg alloy in electromagnetic casting. The calculated results showed that the distribution of temperature field of Mg alloy in electromagnetic casting is reasonable in frequency 10Hz.关键词：Mg Alloy;Electromagnetic Casting;Flow Field;Temperature Field
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- 220
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发布时间：2023-12-18 - 摘要：The thermal stability of refined grain of trace B and an additional trace Zr modified brass HPb59-1 during holding at thermal processing temperature range was examined. The results showed that the normal growth of refined grain at the pertinent thermal processing temperature range and holding time has no deteriorative effect on the refinement, i.e., the refined grain was still much finer than unmodified grain. However, an abnormal rapid growth of the refined grain up to couple of mm from surface toward center of the alloy took place with prolonging holding time or relevant high temperature. Although an additional trace Zr has the slight effect on modification and normal growth rate of refined grain, it can inhibit effectively the above mentioned abnormal grain growth of refined grain.关键词：Brass HPb59-1;Modification Refinement;Grain Growth
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- 210
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发布时间：2023-12-18 - 摘要：A 3-D mathematical model for flowing field coupled with temperature field in strip twin rolling-casting process is developed, and the effects of processing parameters on roll-casting process were studied. The results showed that relevant homogeneous structure in thickness direction of the strip can be obtained with lower superheat while the metal was solidified in gating system to obstruct inclusion removal with too low superheat. Solidified end-point can be just located at the range of 2～8 mm above the anastomosing point of roll gap when rolling-casting velocity is at a certain ranges of v ≤ v c.The proposed model can lay down a theoretical foundation for controlling strip rolling-casting process.关键词：Strip Rolling-casting;Flowing Field;Temperature Field;Coupled Numerical Simulation
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- 177
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发布时间：2023-12-18 - 摘要：In mould design, the detemrmination of the parting lines is one of the most consumptive time processes. In order to reduce the cost of mould and improve the automatization of mould design, it is important to determine parting lines with computer aided design （CAD）. So, the methods of parting lines determination are classified, analyzed and compared. And some advices for the research and application of the methods of parting lines determination were given.关键词：Parting Lines;Mould;Die-Casting
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- 81
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- 1
发布时间：2023-12-18 -
- 摘要：Several special casting methods,including gravity casting,low pressure die casting,die casting and squeeging casting etc.,to prepare Mg based bulk metallic glass（BMG）were presented.Their technique,tooling design,chilling principle and final effects obtained were expounded.It was indicated that there was no difference of melt cooling behavior between in water-cooled copper mold and in copper mold within 30 s before solidification and that liquid quenching exhibited more significant efficiency in die casting and also that 10 mm Mg 65 Cu 15 Y 10 Ag 10 based BMG was prepared in squeeging casting.The future development of Mg based BMG preparation trended toward fast rate,simplicity and near net shape.关键词：Mg-based Bulk Metallic Glass;Special Casting;Technique;Developing Trend
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- 308
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发布时间：2023-12-18 - 摘要：The developed history, product and market of Johnson Zr based bulk amorphous alloy, especially the unique properties of the alloy as well as the product development and market based on its properties, were introduced.关键词：Bulk Metallic Glass;Zr Alloy;Amorphous Alloy
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- 205
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发布时间：2023-12-18 - 摘要：The die casing Mg alloy with different washing and predisposing methods was treated by micro-arc oxidation process. The corrosion resistance of die casting Mg alloy specimen and products was investigated under different technical conditions. The factors influencing magnesium alloy corrosion resistance were also analyzed, and the ability to resist corrosion was compared with that of surface treatment in DACRO. The results showed that the surface treatment of micro-arc oxidation can fully meet the requirements of corrosion resistance for automobile housing under proper technical condition.关键词：Mg Alloy;Surface Treatment;Micro-arc Oxidation
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- 486
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发布时间：2023-12-18 - 摘要：It is difficult to manufacture radiator component using integrated structural core in moving die casting die because of thin blades, small gap among the blades as well as deep circlar groove. The use of inserted block for the core in moving die not only overcame the difficulties in mold cavity making but also improved the mold filling and gas release so as to obtain sound casting. The design essentials of the die were described on the basis of analyzing the technological characteristics of die casting for the radiator. The die casting machine was selected by calculating the swelling force and clamping force. The processing parameters and practical die structure were given. Finally running principle of the die and die casting technology were expounded.关键词：Die Casting Die;Die Casting Technology;Inclined Slide Block;Radiator in Die Casting
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- 170
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发布时间：2023-12-18 -
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- 摘要：Rapidly developing status of investment casting industries in Guangdong province in latest decades, especially in latest four years, was introduced. It is stastisized that the output of investment castings reached up to 39 000 tons and output values has exceeded 2 billion yuan in Guangdong province.关键词：Investment Casting;Silicate Sol;Stainless Steel
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- 65
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- 1
发布时间：2023-12-18 -
- 摘要：The EPS pattern is used for carbon steel castings in drying sand mould under negative pressure. The factors influencing carburization in carbon steel castings under various processing conditions in EPC were studied systematically.It was found that carburization in carbon steel casting occured using silica flour,alumina powder and zirconium powder coatings,of which less carburization appeared with silica flour coating.The carburization increased with casting height increase in bottom pouring.In addition,the carburization decreased with vacuum rate increase.关键词：EPC;Carburization;Carbon Steel Castings
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- 102
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发布时间：2023-12-18 - 摘要：The molten rare earth salt for refining impure-red-copper was performed. It is determined that the molten RE salt is mainly composed of RECO 3, Na 2CO 3,CaF, metallic oxide （MO） and Na 2B 4O 7. The optimum composition of molten RE salt refiner was obtained by orthogonal experiment. The results show that the refiner can improve the electric conductivity of refined impure-red-copper up to 99.6% IACS with oxygen content in top level.关键词：Impure-Red-copper;Rare Earth;Molten Salt;Refiner
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- 185
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发布时间：2023-12-18 - 摘要：Li-Si alloy containing 44%Li and 56%Si is produced successfully by smelting at high temperature 750 ℃ for 1 h with the raw materials of high pure Si and Li with expectant less w （Li） =2.5% during smelting. The Li-Si alloy has to be ground sieved and classified.关键词：Li-Si Alloy Powder;Thermal Cell Cathode Material;Li-Si Alloy Smelting
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- 251
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发布时间：2023-12-18 -
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