最新刊期
卷 ， 期 8 ， 2007
- 摘要：HA coating was prepared on the titanium plate surface with anodic oxidized film by electrophoresis co-deposition, and effects of electrolyte concentration, voltage and time on both anodic oxidation film and morphology of HA coating were examined by XRD and SEM. The results show that Ti oxidation film with fine morphology can be observed with 20% H2SO4 in the bath, voltage of 120V and oxidized time for 10 min. Meanwhile, the HA coating with fine morphology can be prepared with HA content of 15g/L, voltage of 250V and deposition for 3 min.关键词：Hydroxyapatite （HA）;Anodic Oxidation;Electrophoresis Co-deposition;Ti
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发布时间：2023-12-18 - 摘要：The variation of density and viscosity of gallium melt and its microstructure evolution were investigated by measuring density and viscosity at different temperatures. The results reveal that the density of gallium is decreased and its volume is increased with raising temperature. Meanwhile, the viscosity of the gallium is increased with dropping the temperature to a threshold value at 180210 ℃, characterizing by an exponential relationship.关键词：Gallium;Melt Structure;Density;Viscosity
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发布时间：2023-12-18 - 摘要：Microstructure and properties of permanent mold high Cr cast iron with three kinds of Cr content were investigated according to the requirements for production and application of centrifugal casting composite roller sleeve. It is found that the as-cast microstructure of permanent mold Cr20 cast iron that possesses higher ductility and good corrosion resistance as well as wear resistance consists of dendrite austenite, eutectic austenite and eutectic carbides, and its as-cast hardness can reach about HRC55. So the Cr20 high Cr cast iron can meet the application demand of the roller under wet friction condition.关键词：High Chromium Cast Iron;Microstructure;Permanent Mold;Composite Roller
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发布时间：2023-12-18 - 摘要：The SiC nano-particle reinforced AM60 magnesium alloys were fabricated by the semi-solid process. The effects of SiC nano-particles on microstructure and mechanical properties of AM60 alloy have been investigated by optical microscope, Brinell hardness tester and MTS material testing machines etc. The results reveal that the microstructure and mechanical properties of the AM60 magnesium alloy can be improved with the addition of SiC particles. With 1% SiC nano-particles addition, the optimized mechanical properties of the alloy can be observed, whose yield strength, tensile strength and elongation are improved by 56.9%, 19.2% and 69.3% respectively, and whose hardness and impact energy are increased by 16.4% and 18.8%, respectively, compared with those of the original alloy. The mechanism of strengthening and toughening of magnesium alloys containing SiC nano-particles are also approached.关键词：Magnesium Alloy;SiC Nano-particles;Semi-solid;Microstructure;Mechanical Properties
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发布时间：2023-12-18 -
- 摘要：Numerical simulation of porous Al-Cu metaloceramics in squeezing-infiltration method has been conducted by the Procast software, and the experiment has been made. The results verify that solidified time and solid-liquid phase structure in numerical simulation results are well in agreement with that in the experiment and metallographic observation, showing the availability of the simplified model in simulation of porous Al-Cu metaloceramics in squeezing-infiltration method. The infiltrated formation of the Al-Cu metaloceramics is totally different from the formation of common alloys. The defects in the metaloceramics are attributed to the complexity of internal structure in porous metaloceramics performs.关键词：Numerical Simulation;Porous Metalloceramics;Infiltration;Composites
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发布时间：2023-12-18 - 摘要：A stochastic model of nucleation and growth has been established with continuous cooling, in which time factor is taken into consideration to generate the direct relativity of time with the function of nucleation and growth model, based on the Oldfield continuum nucleation and growth model by means of basic theory on metal solidification to simulate the evolution of metal microstructure during solidification process. The microstructure evolution of eutectic Zn-5Al alloy has been simulated by the model, and the verification experiment has been performed. The results show that the simulated results are well in agreement with the experimental ones, revealing the availability of the model.关键词：Microstructure Simulation;Solidification;Nucleation;Growth
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发布时间：2023-12-18 - 摘要：Progress in technologies for preparation of Ti alloy and Ti alloy parts by Ti alloy powder metallurgy with hydrogen alloying was surveyed. The formation technologies of Ti alloy powder with hydrogen, properties of formed parts as well as the work mechanism of hydrogen in the Ti alloy powder were described. The future of the Ti alloy parts with high properties and low cost by Ti alloy powder with hydrogen was reviewed.关键词：Ti Alloy;Hydrogen;Mechanical Properties;Powder Metallurgy;Porosity
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发布时间：2023-12-18 - 摘要：The light alloy was widely used for aerospace, automobiles, motorcycles, optical instrument, mechanical equipment, medical apparatus as well as electronic parts due to its characteristics of low weight, high specific intensity and thermal conductivity as well as anti-electromagnetic properties. However, the light alloy has some disadvantages, such as low hardness, worse wear resistance and corrosion resistance, so it is necessary to perform surface treatment to improve the corrosion resistance, wear resistance, anti-friction as well as oxidization resistance at a high temperature.关键词：Light Alloy;Surface Treatment;Hardness
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发布时间：2023-12-18 -
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- 摘要：The comparative analysis of processing performance and adaptability of die casting, squeezing casting and semi-solid forming was conducted. The results reveal that each of these three processing has its advantages and disadvantages, and no one can meet all the desired demands including complexity, accuracy of size and mechanical properties of component. However, they can bring out its strengths to make up for the others weakness. So it would be important to explode the potential of each processing enough to improve the processing level.关键词：Die Casting;Squeezing Casting;Semi-solid;Adaptability of Processing
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发布时间：2023-12-18 - 摘要：The last progress in semi-solid aluminum alloy billet preparation technologies and commercial application of semi-solid thixo-forming technology have been described emphatically, focusing on compound electromagnetic preparation, semi-solid continuous casting with multi-stream electromagnetic stirring, semi-solid thixo-forming die casting, semi-solid thixo-forming forging, and so on. In addition, the potential applied field and developing future of semi-solid aluminum alloy processing technologies have been expounded including the forming of non-easy casting alloy, direct casting of wrought aluminum alloy, working forming of piston alloy and deformation treatment of wrought alloy.关键词：Aluminum Alloy;Semi-solid;Thixo-forming;Rheo-forming
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发布时间：2023-12-18 - 摘要：We have designed an experimental horizontal continuous induction reheating device based on semi-solid thixoforming principle. The simulation of temperature field in the ZL112Y aluminum alloy billets has been conducted with the ANASYS software with different heating power of three induction heating devices. The optimized heating power and heating time of different induction heating devices have been given for the process of heating from room temperature to semi-solid temperature of the billets.关键词：Continuous Thixoforming;Induction Heating;Numerical Simulation;ZL112Y Aluminum Alloy
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发布时间：2023-12-18 -
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- 摘要：<正>2007年中国压铸、挤压铸造、半固态加工学术年会于7月7日至11日在中国西南重镇重庆隆重举行。会议由中国铸造学会压铸专业委员会、中国兵工学会金属材料学会挤压铸造专业委员会、中国塑性工程学会半固态加工学术委员会、《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、重庆大学承办,重庆市铸造学会、重庆铸造行业协会、宁波铝台精机有限公司、力劲集团协办。
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发布时间：2023-12-18 - 摘要：J458 type low pressure die casting machine is used to produce whole aluminum alloy wheel for automobile, in which the controlling precision of liquid surface applied-pressure system is lower than 0.2% with the repeating precision lower than 3%,the control precision of holding temperature of liquid aluminum alloy in holding furnace is about 680720℃, and the dimension precision in cavity of die is± 0.1mm. The qualified rate of the whole aluminum wheel reaches up to 95% using the low pressure die casting machine.关键词：Low Pressure Die Casting Machine;Aluminum Alloy;Wheel
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发布时间：2023-12-18 - 摘要：The present status of die casting industry in Guangdong province was surveyed.The total die casting product volume is 328000 tons in 2006,in which the five enterprises have the capacity of more than 10000 tons production volume.Some leading companies is exploring new developing paths,such as exploiting capital market to expand production scale,exploring out-market and foreign market,changing conventional manufacture mode,and applying new save-energy technologies and so on.The prominent achievement can be obtained based on above-mentioned measures as well as building up green die casting idea,enhancing environmental protection and implementing cleaning production.关键词：Guangdong;Die Casting Industry;Production;Technology;Market
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发布时间：2023-12-18 - 摘要：The crack in investment castings is commonly created around ingate due to easily forming superheating at root of ingate. For the investment casting required for X-detection, the liquid steel should be smoothly filled in designing gating system. Through adopting turn-ingate to effectively reduce the filling velocity of liquid steel to transfer the superheating zone in the investment casting, the crack created around the ingate can be reduced or eliminated greatly.关键词：Investment Casting;Crack;Superheating;Smoothly Filling
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发布时间：2023-12-18 - 摘要：The solidification structure and phase constituent of Mg-8.2Al-4.7Ca alloy ribbons prepared by melt-spinning have been observed by XRF,XRD, optical observation and micro-hardness measurements, meanwhile, the effects of rotating speed of the single-roller on the thickness and micro-hardness of the Mg alloy ribbons have been approached. The results indicate that the melt-spinning alloy ribbons are composed of amorphous phase and fine hcp-Mg（Al,Ca） phase, which is different from that of conventionally solidified alloy ribbons. It can be observed from the cross section of the ribbon that three distinct zones appears in the microstructure: fine equiaxed grain size close to the copper roller, columnar zone and coarse equiaxed grain zone close to the free surface. With the increase of rolling speed, the micro-hardness of the alloy ribbons can be increased, which is attributed to the refinement of the grain size.关键词：Melt-spinning;Mg-Al-Ca Alloy;Microstructure;Micro-Hardness
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发布时间：2023-12-18 -
- 摘要：The Mg-Al/Al gradient composites with the magnesium in internal layer and pure aluminum in external layer have been prepared by double-streaming-pouring techniques. The results show that the metallurgical bonding can be generated between magnesium alloy and pure aluminum, and the gradient distributed transition zone of the components and hardness can be observed in the composites. In addition, the prepared composites possess a desirable responding relationship among the composition, macro-structure and hardness. However, the sharp density difference between the Mg alloy and pure aluminum can cause the dramatic mixture of the two melts to result in the sharp composition variation of the internal alloy.关键词：Continuous Casting;Composites;Magnesium Alloy;Aluminum
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发布时间：2023-12-18 - 摘要：The observation of single-directional infiltration behavior of aluminum alloy melts in SiC particle performs has been conducted in squeezing castings. The results show that the flow front of aluminum melt exhibits a dynamic non-infiltration behavior with the surface of SiC particles in squeezing casting. The infiltration of the aluminum melt in the SiC particles is controlled by capillary effects, showing a selective infiltration behavior of gradually infiltrating different size particles with the increase of infiltrated pressure. Based on above-mentioned mechanism, the formation of microstructure of the composites was approached.关键词：Infiltration;Squeezing Casting;Particle Reinforced Composites;Al Matrix Composites;SiC Particle
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发布时间：2023-12-18 - 摘要：The ageing behavior of 6063 aluminum alloy produced with grain-refining aluminum ingot has been examined by TEM and DSC. It is found that the 6063 aluminum alloy exhibits better ageing hardening behavior with ageing at 200 ℃, which can not only obtain higher ageing hardness at a short time （about 80 min） , but also remain higher ageing hardness at a longer time （80320 min）. The formation of cell structure and existence of amounts of dislocation tangle resulting in the prior precipitation of precipitates before artificial ageing can be responsible for higher ageing hardness with ageing at 200℃ for 80 min. The remaining higher ageing hardness with ageing at 200℃ for 80320 min is attributed to the β" precipitate in the alloy. Si/Mg cluster and many kinds of precipitates occur in the alloy aged at 30 and 270℃, resulting in the change of ageing hardness of the alloy.关键词：6063 Aluminum Alloy;Grain-refining Aluminum Ingot;Ageing
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发布时间：2023-12-18 - 摘要：The effects of different pulsed electric current peak values on solidification structure and mechanical properties of AZ91magnesium alloy have been investigated, which was compared with that of the alloy treated by MgCO3. The results show that with increasing the peak voltage of pulsed current, the solidification structure of the magnesium alloy can be greatly refined and the mechanical properties can be improved. With the peak voltage of 2000V, compared with the un-treated sample and with modified samples, the pulsed current treated samples can be increased by 25% and by 4% in tensile strength, and by 128% and by 14% in elongation, respectively.关键词：Pulsed Current;AZ91 Magnesium Alloy;Solidification Structure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：Effects of 0.5%Ce, 0.2%Ca and 0.2%Sr mixing addition on corrosion resistance of AZ91 magnesium alloy in 3.5%NaCl aqueous solution were examined by static weight loss and metallographical observation. The results indicate that the 0.5%Ce, 0.2%Ca and 0.2%Sr mixing addition can greatly decrease the corrosion rate of the alloy, and the corrosion resistance of the alloy is evidently superior to that of AZ91 matrix and to that of the alloy with only 0.5% Ce addition, which is attributed to the 0.5%Ce, 0.2%Ca and 0.2%Sr mixing addition evidently refining the grain size of α-Mg phase and relieving the segregation of Al element as well as changing bulk β-Mg17Al12 phase into discontinuous net-like ones.关键词：AZ91 Magnesium Alloy;Alloying;Corrosion Behavior
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发布时间：2023-12-18 - 摘要：The PEO treatment for ZL101 aluminum alloy in sodium silicate solution was carried out, and the formation, constituent and structure of the PEO coatings were investigated. The coating can be created on the primary α phase and eutectic phase respectively in initial stage of PEO, and the absence of plasma discharge in the Si phase can be observed. SiO2 phase in the coatings is formed by high temperature oxidization of Si from the plasma discharge adjacent to α phase. The coating on the primary α phase is composed of major Al2O3 and minor SiO2 phase while SiO2 phase content is much more than Al2O3 content in the coatings on the eutectic phase. PEO coating of ZL101 aluminum alloy is composed of γ-Al2O3, α-Al2O3, SiO2 and mullite （3 Al2O3·2SiO2）, in which with the extend of PEO treating time, the α-Al2O3 phase is raised due to the transformation of γ-Al2O3 into α-Al2O3.关键词：PEO;ZL101 Aluminum Alloy;Phase Constituent;Formation
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发布时间：2023-12-18 - 摘要：Effects of Gd addition on the microstructure and mechanical properties of Mg-2Al-Zn magnesium alloy were investigated. The results reveal that the microstructure of as-cast Mg-2Al-Zn-xGd alloy is composed of α-Mg and Al2Gd phase formed by the prior reaction of Al and Gd. The amounts and morphology of Al2Gd phase are controlled by the Gd addition. Meanwhile, the dispersive Al2Gd phase had a positive contribution to greatly improve the mechanical properties of the alloy. The tensile strength and yield strength of the alloy are 252 MPa and 135 MPa respectively with 2% Gd addition, while the mechanical properties of the alloy can be obviously deteriorated as a result of the increase of the amount and size of Al2Gd phase with 3% Gd addition. The segregation of polygon and acicular Al2Gd particles in the boundary or the matrix can result in the change of fracture morphology from ductility fracture into cleavage fracture.关键词：Magnesium Alloy;Gd;Al2Gd;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：The cooling rate of Cu-12.5Cr powder with various diameters prepared by gas atomization process was calculated by the convection heat-transfer theory. The effects of cooling rate on morphology and distribution of Cr phase in the alloy, and on hardness and lattice constant have been investigated by OM（optical microscope）, micro-hardness meter and XRD （X-ray diffraction）. The results reveal that the hardness of the Cu-12.5Cr powder is increased by about 100%, and the grain size of Cu phase in the alloy is decreased while the grain size of Cr phase is firstly reduced then increased with the increase of cooling rate from 104 K/s to 105 K/s.关键词：Cu-Cr Alloy;Cooling Rate;Solid Solubility;Lattice Constant
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发布时间：2023-12-18 - 摘要：The high temperature oxidation behavior of Cu-Si alloy prepared by CA （chemical alloying） and MA（mechanical alloying） was examined in pure O2 at 700800 ℃. The results show that the mixed oxidation zone with enriched SiO2 can be created, however,the continuum SiO2 film can not be observed in the alloy prepared by both CA and MA methods. The oxidation rate of Cu-Si alloy prepared by MA method is lower than that prepared by CA method, which is attributed to the refinement of grain size in the alloy enhancing the diffusivity of Si. In addition, the rapid formation of SiO2 enriched zone （Cu2O+ SiO2） can effectively control the diffusion of the Cu element.关键词：MA（Mechanical Alloying）;Cu-Si Alloy;High Temperature Oxidation
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发布时间：2023-12-18 - 摘要：Effects of Ni on the performance of Sn2.5Ag0.7Cu0.1RE solder alloy and its solder joints have been examined. The results indicate that the performance of solders and its joints can be improved with the Ni addition, especially the elongation of Sn2.5Ag0.7Cu0.1RE solder alloy with 5% Ni addition can be improve greatly without degrading strength, which is 1.4 times higher than that of the commercial Sn3.8Ag0.7Cu solder alloy. Meanwhile, the creep rupture life of the solder joints is the highest, which is 13.3 times longer that that of Sn2.5Ag0.7Cu0.1RE solder joints, and is markedly longer than that of the commercial Sn3.8Ag0.7Cu solder alloy, meeting the requirements of micro-electric trade for lead-free solder alloy with high strength and toughness as well as high reliability.关键词：Sn2.5Ag0.7Cu0.1RexNi Solder;Tensile Strength;Elongation;Solder Joints;Creep Rupture Life
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发布时间：2023-12-18 -
- 摘要：<正>商（公元前十七—前十一世纪）晚期锡青铜通高133cm,口长116cm,宽79ca,重875kg传1939年河南安阳殷墟出土国家历史博物馆藏殷墟是商代晚期的都城所在地,位于今河南安阳西北部。商代亡国后即沦为废墟。殷墟出土青铜器种类繁多,以纹饰华丽、精美绝伦著称于世。其铸造作坊已在殷墟发现多处,出土大量陶范和陶模碎块,是研究中国古代铸造技术和生产组织的重要实物资料。殷墟已列入世界文化遗产名录。
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发布时间：2023-12-18 - 摘要：<正>20070801门井浩太,中江秀雄.泡沫铝合金的制造及泡的成长机理.铸造工学（日）,2007,79（1）:3-7.基于泡沫铝制造条件的翁化,通过合金化降低熔点,研究了发泡剂添加温度、熔液粘度、合金成分等参数对发泡性能的影响,探讨了铝合金内Hz泡的生长机理。试验原材料选用Al-12.6Si和Al-25Cu-5Si合金。合金在电炉内用6号石墨坩埚加热,熔化温度1173K,增粘剂加入1%（质量分数,下同）的Ca粉和加入5%的Al粉,发泡剂则加入0.5%的TiH2。搅拌
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发布时间：2023-12-18 - 摘要：<正>070801离心注射模具,CN03811157.8,2005-08-10,巴西船用压缩机有限公司。一种离心注射模具,其特征在于它包括一带有基块的下模,该基块在其下部被旋转地安装在轴承装置上,而所述轴承装置则与一机械结构相连,多个轴向柱.这些轴向柱在其外围上部被固定于基块上,以及一能够限定出下模腔、且被滑动地安装在轴向柱上的可动块,从而可在开模位置和闭模位置之间轴向移动,弹性件位于基块上,并且能够经常地将可动块推到闭模位置处;一安装在各个轴向柱上的锁紧装置;以及一能够可移动地位于轴向柱上、并通过锁紧装置固定在闭模位置处的上模。
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发布时间：2023-12-18
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