最新刊期
卷 34 ， 期 1 ， 2014
- 摘要：To improve the utilization of Sc in the Al-Mg-Sc-Zr alloy,effects of squeeze casting on precipitation behaviors and mechanical properties of Al-5.36Mg-0.40Mn-0.16Sc-0.14Zr（mass fraction,%）alloy were investigated by optical microscopy（OM）,scanning electron microscopy（SEM）,transmission electron microscopy（TEM）and tensile tests.The results show that precipitates on grain boundaries are more dispersed in the squeeze casting than in the permanent mould casting.Few primary Al3（Sc,Zr） microparticles can be observed in the squeeze casting,and the average grain size is grown slightly.Although the yield strength of the samples in two casting methods is nearly the same,the tensile strength and elongation of the samples in the squeeze casting are higher than those in the permanent mould casting.After 350℃/12hannealing,the Al3（Sc,Zr）nanoparticles are precipitated from the matrix both in squeezing casting and in permanent mould casting,however,there are more Al3（Sc,Zr）nanoparticles precipitated in the squeezing casting,showing a stronger precipitation strengthen effect,where the yield strength of the alloy is 25MPa higher than that in the permanent mould casting.关键词：Al-Mg-Sc-Zr Alloy;Squeeze Casting;Precipitation Strengthening
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发布时间：2023-12-18 - 摘要：Effects of solid-solution treatment on microstructure and mechanical properties of AZ81-xSr magnesium alloy were investigated.The results indicate that theβ-Mg17Al12 phase of AZ81-xSr alloy is almost totally dissolved into matrix after solid-solution treatment,however,Sr5Al9 phase is not dissolved into matrix.After solid-solution treatment,the form of new skeleton-like Sr5Al9 phase is changed to be lamellar and particular structure.Moreover,mechanical properties and hardness of the alloy are also obviously improved after the solid-solution treatment.关键词：AZ81-xSr Magnesium Alloy;Solid-Solution Treatment;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：<正>2013年11月1617日,福建省铸造行业协会2013年年会在三明市召开,共有150多人出席会议。年会以"创新、调整、提升、高效"为主题,10多位专家学者和铸造工作者在会上进行了专题报告和论文交流。报告和论文充分展示了近几年福建省铸造企业、科研院所及广大铸造工作者在新技术、新材料、新工艺、新产品研发,以及在结构调整、转型升级以及企业经营管理方面所取得的新成果、新发展、新面貌和宝贵的经验。与会人员同时参观
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发布时间：2023-12-18 - 摘要：<正>"第四届中国耐磨铸件年会"于2013年11月911日在天津锦龙国际酒店召开。本届年会由中国铸造协会主办,中国铸造协会耐磨铸件分会、钢铁耐磨材料产业技术创新战略联盟、迁西奥帝爱机械铸造有限公司共同承办,济南圣泉集团股份有限公司、宁国市志诚机械制造有限公司、安徽省宁国新宁实业有限公司共同协办,暨南大学与天津市立鑫晟精细铸造有限公司共同协办。本届年会共有来自全国各地160余位代表。本届年会由宋量教授级高工、邢建东教授、李卫教授、魏世忠教授共同主持,中铸协耐磨铸件分会2013年轮值理事长、迁西奥帝爱公司张会友董事长张会友致开幕词,中国铸造协会专职副理事长温平代表中铸协讲话,河北省铸造协会秘书长马云献代表兄弟学协会致辞。本届年会的主题是:新形势下耐磨材料的机遇、挑战与发展。年会围绕主题,以大会报告、经验介绍、技术研讨及专家与代表
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发布时间：2023-12-18 - 摘要：Effects of mechanical alloying on the microstructure and morphology of Cr-33Ta powders were investigated by means of X-ray diffraction（XRD）,scanning electrical microscopy（SEM）and energy dispersive spectrometer（EDS）.The results indicate that Cr-33Ta powders become homogeneous gradually and finally evolve into Cr（Ta）and Ta（Cr）supersaturated solid solutions,and the grain size of Ta and Cr is decreased and the microstrain of Ta and Cr is increased gradually with the increase of the ball milling time.The Cr-33Ta powders with sharp crushed-stone-like morphology are evolved steadily into the nearly spherical equiaxed particles by mechanical alloying,and the grain size of particles is refined obviously after 20hmilling,where average particle size is less than 5μm.The Ta and Cr mixed powders with nano-sized grains were achieved.关键词：Ball Milling Time;Laves Phase;Cr-33Ta;Microstructure;Morphology
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发布时间：2023-12-18 - 摘要：Effects of later processing parameters such as the real phosphorus（P）content in melt,pouring temperature and cooling rate on the refinement of primary silicon particle in A390aluminum alloy were investigated by OM（optical microscopy）and Image Plus software.The results demonstrate that P can significantly refine primary silicon morphology,and primary Si phase size is decreased with increasing in the real P content in melt.With the increase of pouring temperature,the P modification effects is improved increasingly.Cooling rate plays a key role in P modifying primary silicon,where refinement of primary Si phase in the alloy can be neglected with the low cooling rate even under the condition of optimized P content in melt and reasonable pouring temperature.关键词：High Silicon Aluminum Alloy;Modification;Primary Silicon;Pouring Temperature;Cooling Rate
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发布时间：2023-12-18 - 摘要：The microstructure of Cu-0.4Cr-0.2Zr-0.15Mg-0.02Ce alloy at as-cast,solid solution state and aging state was observed using optical microscope（OM）,scanning electronic microscope（SEM）and transmission electron microscope（TEM）.The precipitation phase of the alloy prepared was analyzed using energy dispersion spectrometer（EDS）.The results show that the microstructure of as-cast Cu-0.4 Cr-0.2Zr-0.15Mg-0.02Ce alloy exhibits typical dendrite structure,and the strip precipitated phase which is intermetallic compound contained Mg and Zr can be observed after solution treatment at 960℃ for 2h,and chromium-rich phase（Cr）and zirconium-rich phase（Cu4 Zr）can be generated after 60% cold-rolled deformation and aging at 480℃for 8h,meanwhile,Mg,Zr,Cr content in the strip intermetallic compound are increased obviously.The conductivity and hardness of the alloy with aging at 480℃ for different time such as 2、5、8、11、14、17hwere analyzed.The results show that the electric conductivity and hardness are increased quickly at first and then tended to stable state,finally decreased with increasing in the aging time.Conductivity and hardness reach the maximum values of 165and 46.98MS/ m,respectively,at 480℃×8hand at 480℃×11h,respectively.关键词：Cu-Cr-Zr-Mg-Ce;Microstructure;Aging;Electrical Conductivity;Hardness
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发布时间：2023-12-18 - 摘要：Hot compression of AZ61 magnesium alloy was conducted on the Gleeble-1500hot-simulator at 250400℃ and 0.00110s-1,and the deformation behavior and processing map of the AZ61 alloy were investigated.The results show that ZA61 alloy deformed at strain rate of 10s-1 exhibits higher power dissipation,and dynamic recrystallizaton（DRX）occurs extensively both at the grain boundaries and twins,consequently resulting in a more homogeneous DRX grains.Therefore,the optimized processing parameters of AZ61 alloy are the temperature range of 250400℃ and strain rate of 10s-1.关键词：AZ61Alloy;Hot Compression Deformation;Processing Map;Microstructure;Dynamic Recrystallization
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发布时间：2023-12-18 - 摘要：<正>目前,东风精密铸造安徽有限公司（下称安徽公司）,在安徽省合肥巢湖经济开发区正式投产运营。安徽公司占地面积130亩,采用整体规划、滚动建设的实施方式,最终形成2万吨成品化精铸件生产能力;首期投入生产的1号生产线产能为5 000吨,产品服务于华东区域整车客户与海外客户。安徽公司历经20个月的建设,以行业标杆为定位目标,导入了东风精铸多年积累的多项制
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发布时间：2023-12-18 - 摘要：<正>2013年11月1日,经秦皇岛经济技术开发区工商行政管理局正式注册,并由中信集团批复同意设立的凯斯曼秦皇岛汽车零部件制造有限公司正式成立。凯斯曼秦皇岛汽车零部件制造有限公司位于秦皇岛市经济技术开发区中信戴卡产业园内,占地6.67万平方米,厂房面积约3万平米。项目的整体建设将在2014年9月完成,产能规划为年产2万吨轻合金汽车铸件。
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发布时间：2023-12-18 - 摘要：<正>近日,铝行业分析师在中国有色金属行业年会上预测,2013年中国电解铝产能为3031.5万吨,产量为2486.6万吨,产能利用率为82%。同时预计,2014年中国电解铝产能为3420万吨,同比增长12.8%;产量为2832万吨,同比增长13.9%。
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发布时间：2023-12-18 - 摘要：<正>泊头市现有铸造企业300余家,大多数铸造企业的污染治理设施无法满足环保要求。为改善环境质量,2013年,该市下发了《泊头市铸造行业环境整治实施方案》,并抽调环保部门70余名机关干部成立13个驻乡工作组,进驻全市13个乡镇、工业区,对铸造企业的环境污染整治提供技术支持及政策解释,确保2014年6月底前,全市铸造企业全部实现达标排放,否则一律关停。
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发布时间：2023-12-18 - 摘要：<正>"今年前9个月,全市铸造加工企业实现销售收入62.3亿元,同比增长29.1%,完成利润3.2亿元,同比增长27.8%,上缴税金7157万元,同比增长25.2%。"这是日前我们从市经信局获得的一组令人振奋的数字。目前庄河市共有铸造加工企业31家,年全市铸造能力达30万吨以上。为了提高庄河市铸造加工业的市场竞争力,近年来,全市铸造加工行业不断整合铸造资源,采用先进的技术装备,推行先进铸造工艺,提高行业准入标准,依托技术做强产品,依靠产品质量打通市场,实现了庄河市铸
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发布时间：2023-12-18 - 摘要：<正>从中国科学院大连化学物理研究所获悉,该所研究员李兴伟带领团队,历经三年多努力,通过对底物和反应条件进行设计,在氧化条件以及非氧化-还原条件下利用三价铑催化剂,实现了一系列碳氢键活化的新方法,先后在《德国应用化学》发表五篇研究论文,受到国内外同行的广泛关注。三价铑催化剂具有独特的立体和配位性质,被广泛应用于碳氢键的活化研究,而碳氢键的活化主要由金属催化来实现。其成果主要应用于"药物合成"和"能源"两大重要领域。
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发布时间：2023-12-18 - 摘要：Gating system for aluminum alloy oil pan was designed preliminarily based on analysis of process and structure.With the help of AnyCasting software,effects of different process parameters and ingate size on filling and solidification process of casting were analyzed systematically to predict distribution of shrinkage porosities（holes）.Shrinkage porosities（holes）in the aluminum alloy oil pan were decreased effectively by optimizing the process parameters and the ingate size.The optimized process parameters were presented as follows:pouring temperature of 650℃,mould temperature of 190℃,0.25 m/s low speed and 3.15m/s high speed of plunger as well as the ingate thickness of 6mm.关键词：Die Casting;Aluminum Alloy;Numerical Analysis;Optimization
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发布时间：2023-12-18 - 摘要：The sand mold gravity casting process for ZL104aluminum alloy piston was simulated by the ProCAST software.Based on the simulated results,the velocity field and temperature field of filling and solidification process were predicted,and the defect area was estimated.The optimized processing design was presented.With adding a riser and reducing the casting speed,the defect position in the initial castings was transferred,and the quality and yield of the castings were improved.关键词：ProCAST;Piston;Numerical Simulation;Processing Optimization
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发布时间：2023-12-18 - 摘要：Temperature and thermal stress field in 7050aluminum alloy stress frame specimen in the process of quenching cooling were predicted with the help of the nonlinear finite element software ABAQUS,in which non-linear features of thermal-physical properties of the 7050alloy during quenching process and elevated mechanical property parameters were considered comprehensively.The results indicate that temperature field simulation is well agreement with temperature field distribution of the quenched specimen,and deformation features of stress frame sample is accordant with the recognition results.关键词：Aluminum Alloy;Temperature Field;Thermal Stress Field;Numerical Simulation
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发布时间：2023-12-18 - 摘要：Soft reduction can reduce segregation in high carbon steel continuous casting slab.Determination of reduction parameters is very important to the soft reduction technology.Based on the theoretical analysis and the practical product from some plants,it is found that the desirable soft reduction effects can be obtained with solid fraction in 30%70%and the total reduction in 47mm.The soft reduction process can improve the macro structure and carbon segregation at center.关键词：High Carbon Steel;Soft Reduction;V Shape Segregation;Center Carbon Segregation
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发布时间：2023-12-18 - 摘要：Based on magneto-hydrodynamics（MHD）combining with computational fluid dynamics（CFD）,structure design of electromagnetic stirrer for secondary cooling zone from a stainless steel enterprise was optimized.Meanwhile,relationship of the electromagnetic field with liquid steel flow was described quantitatively.The results show that the optimized electromagnetic stirring parameters are presented as follows:current density of 600800Aand frequency of 812Hz.Electromagnetic stirring is a effective way to control and improve the microstructure of ferrite stainless steel in the continuous casting process.With the help of the optimized stirring parameters and the flow velocity of liquid steel in the mould of 0.6m/s,the equiaxed crystal rate in the stirred zone can be increased significantly.关键词：EMS;Ferrite Stainless Steel;Continuous Casting;Solidification
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发布时间：2023-12-18 - 摘要：The hypereutectic Al-18Si alloy was prepared by CDS technology,and the effects of precursor alloying component and mixing methods on the size,morphology and distribution of primary silicon phase in the alloy prepared were investigated by OM（optical microscope）.The results show that,at fixed overheating temperature of precursor Al-Si alloy,under solid pure Al mixing with liquid Al-25Si, the desirable microstructure in the alloy can be obtained,where the average size of primary Si is 11.68 μm with shape factor of 1.608.The analysis reveals that,at the same mixing method,the refining effect is increased with increasing in Si content.With a higher Si content in precursor Al-Si alloy,liquid Al mixing with liquid Al-Si alloy can weaken segregation of primary Si and refine grain size,while with a lower Si content in precursor Al-Si alloy,solid pure Al mixed with liquid precursor Al-Si alloy is a acceptable method.关键词：Hypereutectic Al-18Si Alloy;Controlled Diffusion Solidification;Precursor Alloying Component;Mixing Methods;Primary Silicon
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发布时间：2023-12-18 - 摘要：A multi-directional vacuum system based on IPC and PLC was developed,which exhausted from mold cavity,sleeve and die carrier.The system consists of hydraulic vacuum valve and vacuum system controlled by IPC and PLC.The results show that the hydraulic vacuum valve has the features of simple,easily maintenance and high reliability.The vacuum system based on IPC-PLC method possesses some functions such as detection of vacuum level and moisture as well as some shot parameters including velocity,pressure and stroke.Meanwhile,real-time curves of above parameters can be shown.High vacuum die casting with multi-way venting has the advantages of fast venting,powerful data-processing capacity.关键词：High Vacuum Die Casting;Vacuum Control System;IPC;Hydraulic Vacuum Valve
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发布时间：2023-12-18 - 摘要：Based on the properties and characteristics of the EN AC-48000aluminum alloys,the feasibility of the alloy for die casting piston guide-pillar in clutch for a car was analyzed.The process design and numerical simulation for the die castings were carried out.Meanwhile,the piston guide-pillar was trialproduced to analyze the quality,hardness and microstructure.The results show that the EN AC-48000 aluminum alloys can be used for die casting components.Ring-gating system is a satisfied choice for die casting cylinder component.With slow shot speed of 0.3m/s and fast shot speed of 3.6m/s as well as specific pressure of 80MPa,the quality and appearance of the piston guide-pillar meet requirement in the absence of vacuum die casting.关键词：Aluminum Alloy;Die Casting;Piston Guide-Pillar
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发布时间：2023-12-18 - 摘要：Vacuum die casting for magnesium alloy motorcycle wheel was analyzed.The results indicate that high pressure die casting with vacuum can decrease or eliminate oxidized inclusion and gas hole occurred in conventional die casting wheel,greatly improving quality of the wheel,meanwhile,the mechanical properties of the vacuum die casting wheel can be improved by heat treatment.Bottom-pouring with vacuum-drawing at the heart for magnesium alloy wheel can eliminate the shortcoming of heartpouring with vacuum drawing at the top.In addition,compared with single feeding-pressure in heartpouring with vacuum-drawing at the top,double feeding-pressure for wheel edge and wheel heart can greatly improve the mechanical properties of the wheel,decreasing the materials cost due to the thickness-increment for wheel spoke and wheel heat in heart-pouring with vacuum-drawing at the top.关键词：Vacuum Die Casting;Throttle Valve for Vacuum;Wheel Hub
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发布时间：2023-12-18 - 摘要：Through annulus electromagnetic stirring（A-EMS）for 7075 aluminum alloy,the slurry with homogeneous temperature field and composition field was prepared to form specimens by rheo-squeeze casting.Microstructure of the specimens prepared was observed.Meanwhile,the filling process was simulated by the ProCAST software.The result shows that the dendritic growth in aluminum alloy after A-EMS is restrained during solidification process,leading to the refinement of the as-cast grain.The specimens formed by rheo-squeeze casting process exhibits sound structure with few casting defects such as hot crack and shrinkage porosity.关键词：7075 Aluminum Alloy;Rheo-squeeze Casting;Annulus Electromagnetic Stirring
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发布时间：2023-12-18 - 摘要：The velocity field and pressure field were calculated by the projection method.Modeling of the filling process was established by the finite differential method through considering plunger movement based on the feature of squeezing casting,and filling process in squeezing casting was visualized.Pure aluminum parts were produced by squeezing casting to verify the availability of the modeling.The simulated results are well agreement with the experimental ones.关键词：Squeeze Casting;Projection Method;Filling Process;Simulation
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发布时间：2023-12-18 - 摘要：Effects of gradient heating mould and uniform heating mould on microstructure and mechanical properties of the hollow Al-Zn-Mg-Cu alloy drive shaft produced by squeeze casting were investigated. The results show that with gradient heating mould,the microscopic morphology of the hollow Al-ZnMg-Cu alloy drive shaft exhibits uniform with absence of apparent big holes.The tensile strength,yield strength and elongation of the Al-Zn-Mg-Cu alloy hollow shaft reach 545MPa,482MPa and 7.8%,respectively,tending to the similar value along the height direction.Meanwhile,they are higher than those of the hollow shaft prepared by uniform preheating mould process.关键词：Squeeze Casting;Al-Zn-Mg-Cu Alloy;Gradient Heating;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：Art castings is mainly produced by investment casting.The typical defects occurred in the wax pattern were described,such as bulge,bubbles,dislocation,fins,uneven thickness,shrinkage porosity,misrun and cold shut.Meanwhile,corresponding measures were presented.关键词：Art Casting;Lost Wax Casting;Wax Pattern Defects
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发布时间：2023-12-18 - 摘要：Direct composite technology and secondary composite technology that micro-arc oxidation combined with post processing technologies（sol-gel technology,electroless plating,electrophoresis,plasmas spraying,magnetron sputter ion plating）were introduced.Influences of different composite technology on microstructure,mechanical properties,corrosion resistance of the composite membrane layer were expounded.Through direct composite treatment,different particles added takes as a part of the composite membrane layer through directly joining the reaction process,affecting the microstructure and morphology of the composite membrane layer to some extent,and besides of improving compactness by decreasing porosity and micro-crack of the membrane layer,the corrosion resistance and wear resistance are improved.Secondary composite treatment can increase the corrosion resistance and decrease the mechanical properties.关键词：Micro-arc Oxidation;Ceramic Layer;Particle;Mechanical Properties;Corrosion Resistance
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发布时间：2023-12-18 - 摘要：Investment casting industry output value in the world was estimated based on the data from the international seminar on investment casting,Tokyo 2013.The investment casting output value in the world at 2012reached up to 11.6billions dollars,increased by 2%compared to 2011.The high valueadded castings were dominant in the investment casting industry at the North American,and its output value is the 41% of the total world investment casting output value,far away higher than that of the other region.The investment casting output value from the island is the 23% of the total world output value,higher than that of the Europe.From the view point of the investment castings structure,the major high-added value castings come from the north American and Europe,while investment castings produced from the China was mainly composed of general commercial castings.关键词：Investment Casting;High-Added Value Castings;Investment Casting Industry
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发布时间：2023-12-18 - 摘要：By directional solidification experiment for a net-shape blade,gating system and directional solidification parameters,sucha s shell preheating temperature,pouring temperature and withdrawal velocity,were optimized.The results show that,in the design of gating system,the blade distribution mode and seeding position are directily relavant with the grain growth and the distribution of temperature field.It is suitable for connecting the seeding with the tenon to avoid distorting deformation of the blade and reduce the metallurgical defects（such as loose,cracks）in the blade.The orthogonal testing reveal that it exhibits negative effects on the grain growth and the solidified surface temperature gradient with a lower shell preheating and pouring temperature or a higher withdrawal velocity.The optimized directional solidification parameters were presented as follows:shell preheating at 1 5101 520℃,pouring at 1 5101 520℃and the withdrawal velocity of 5.0mm/min,where the blade with stable thin straight columnar crystal and absence of the surface oblique or broken grain.关键词：Net-Shape Blade;Directional Solidification;Gating System;Withdrawal Velocity
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发布时间：2023-12-18 - 摘要：A new composite investment casting technique was described,and the related processes including EPS pattern making,surface smoothing disposal and shell-making,were analyzed systematically.It is solved for the following technical problems including low surface quality,pattern contraction distortion,poor shell-making coating property and shells burning failure for EPS pattern.The EPS investment casting was applied successfully in volume-production of complicated automobile lower alloy carbon steel components.Compared with the low temperature wax process,it shows advantages as follows:the pattern-making efficiency increased by 2times,total shell weight decreased by 50%,and dewaxing-free process as well as the dimension precision degree reaching CT6with surface quality of Ra6.3.关键词：EPS Composite Investment Casting;Steel Casting;Application
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发布时间：2023-12-18 - 摘要：A hot extruded LA91alloy was cold-rolled and then annealed,and effects of cold rolling and annealing temperature on microstructure and mechanical properties of LA91alloy were investigated.The results show that,the LA91alloy sheet with 76.7%rolling deformation exhibits high strength and excellent ductility（177MPa and 37.4%,respectively）.Annealing at range of 200 ℃300 ℃,recovery and recrystallization of cold-rolled LA91alloy sheets occur,andβphase gradually become equiaxed, whileαphase gradually is spheroidized.Therefore,with the increase of annealing temperature,the tensile strength of sheets is decreased firstly and then increase with the increase of elongation first and then decrease.The recrystallization temperature ofαphase in the alloy is slightly higher thanβphase,with a fixed alloy deformation.The starting recrystallization temperature with different cold deformation rate is slightly different with annealing for 1h,and the recrystallization is completed at 300℃.关键词：Mg-9Li-1Al Alloy;Cold Rolling;Annealing;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：The common casting-defects of wear-resistant cast iron ring inlaid in aluminum alloy piston from a company were analyzed by means of macroscopic examination,metallographic,scanning electron microscopy（SEM）and energy spectrum analysis（EDX）,and the countermeasures of different defect forms were put forward.The results show that the compound zone between iron ring and aluminum piston is composed of Al-Fe interface,diffusion layer,transition layer and fusing interface between infiltration layer and piston body.The dominant defects in the aluminum alloy piston include air holes,aluminization,cracks in the Al-Fe zone as well as oxide inclusions and slag blowholes,gas holes in interface between aluminizing melt and piston body,which were closely related to the process of iron ring aluminizing and aluminum piston casting.关键词：Aluminum Alloy Piston;Cast-In Iron Ring;Al-Fe Zone;Defects
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发布时间：2023-12-18 - 摘要：Effects of Ce addition and solid solution treatment on the microstructure and mechanical properties of Al-10Mg alloys were investigated.The results indicate that the as-cast microstructure of Al10Mg alloy can be refined as a result of generation of Al4Ce by Ce addition.After solid solution treatment,the Al3 Mg2 phase is almost dissolved intoα-Mg phase.As the increase of Ce,morphology of Al4 Ce phase distributed at grain boundaries is changed from particle-like or short rod-like granular phase to coarse continuous network.Al-10Mg alloy with 0.4%Ce exhibits the satisfied mechanical properties.关键词：Al-10Mg Alloy;Cerium;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：The design process and ideas of mechanical ultrasonic stirring furnace were introduced for preparing the aluminum matrix composites.Design was conducted for aiming at furnace body of the stirring furnace and agitator,especially for designing and describing the relevant problems in furnace body configuration and composites preparation.The results show that the furnace designed has the advantages of heat preservation and heating effect because of designing furnace cover and lifting functions by hydraulic lifting system to ensure the safe and smooth operation of equipment,which can solve the problems in single machine or ultrasonic mixing equipment in the production process,and provide technological support for preparing high performance and uniform composites.关键词：Mechanical and Ultrasonic Stirring Furnace;Preparation of Composites;High Performance
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发布时间：2023-12-18 - 摘要：Microstructures and phase compositions of as-cast and extruded Mg-6Zn-xCa（x=01.35）alloys were investigated by optical microscopy（OM）,scanning electron microscopy（SEM）,X-ray diffraction（XRD）,and the tensile mechanical properties were tested at ambient temperature.The results show that as-cast microstructure is refined and Mg6 Zn3 Ca2 new phase is increased gradually with increasing in Ca content,while MgZn2 phase is decreased gradually until to disappear completely.The second phase tends to distribute along grain boundary with continuous reticulation.Extruded microstructure is refined obviously,where the average grain size is decreased from 15μm for Mg-6Zn alloy to 10μm for Mg-6Zn-0.47Ca alloy.With increasing in the Ca content,tensile strength,yield strength and elongation are firstly increased from 154MPa,67MPa and 6.5%for as-cast Mg-6Zn alloy to 230MPa,78MPa and 13%for as-cast Mg-6Zn-0.085Ca alloy,respectively,and then decreased gradually.Mechanical properties of the alloy is enhanced obviously with 0.085% Ca addition,where the tensile strength and yield strength are decreased lightly,while elongation is increased.However,mechanical properties are deteriorated significantly with more content of Ca（0.47%）addition.关键词：Mg-Zn-Ca Alloy;Microstructure;Mechanical Properties;Extrusion
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发布时间：2023-12-18 - 摘要：<正>国际铅锌研究小组（ILZSG）最新公布的数据显示,2014年全球铅市供应料出现2.3万吨缺口,为5年来首次。该机构预计2014年精炼铅产量将增长4.2%至1 148万吨,需求增4.6%至1 151万吨。2013年铅需求预计将增5%至1 100万吨,而产量增加4.7%至1 102万吨。业内人士分析,铅市场变化预计利好豫光金铅等上市公司。目前豫光金铅铅产能国内第一,且以河南、江西为中心形成了较为完善的回收网络。
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发布时间：2023-12-18 - 摘要：Cu/Al composites were fabricated by solid-liquid bonding method under pressure,and the micro-hardness,tensile strength and microstructures of Cu/Al interfaces were investigated by SEM（scanning electron microscope）,micro-hardness tester and tensile testing.The results show that the wellbonded metallurgical bonding interface with tensile strength of 38.24 MPa can be obtained,and the hardness of interface layer is significantly higher than that of matrix.Fracture is easy to appear in the area nearby the copper side,which is attributed to the generation of thhe CuAl2 brittle phase.关键词：Solid-Liquid Bonding Method;Cu/Al Composites;Interface Layer;CuAl2
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发布时间：2023-12-18 - 摘要：The copper-based FGMs were prepared by vacuum hot pressing,and the hardness,conductivity and density of the copper-based FGMs prepared were measured.Wear behavior was tested by high-temperature friction and wear sampler which was used in vacuum and controlled by MMU-5GA microcomputer.Microstructure and grinding crack morphology were analyzed by the JSM-5610LV scanning electron microscopy and XRD Diffractometer.The results show that functional gradient materials with sound and homogeneous structure can be obtained,and the matrix is distributed continuously with desirable bonding interface and metallurgical bonding layer.The FGMs samples exhibit the higher physical properties and friction and wear performance with ball milling for 40h,compared with the sample for 20 hours.关键词：Functionally Graded Materials;Hot Pressing;Microstructure;Properties
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发布时间：2023-12-18 - 摘要：Effects of Fe and Cr additions on the mechanical properties and wear resistance of Cu-17Ni-3Al alloy were investigated by means of tensile and wear testing,optical microscope and scanning electronic microscope.The results show that grain size and secondary dendrite arm spacing of the alloy are refined by Fe addition,and the Cr-enrichment phase occurs in the alloy containing Cr.The mechanical properties and wear resistance of the alloys are enhanced by Fe and Cr additions.The tensile strength,Brinell hardness of the alloy reach 795MPa and 269HBS with the addition of both Fe and Cr,and the wear volume is reduced by 17.5%comparing to the Cu-17Ni-3Al alloy under the same dry friction condition.关键词：Cu-Ni Alloys;Mechanical Properties;Wear Resistance
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- 201
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发布时间：2023-12-18 - 摘要：<正>20140101井泽龙介,梅泽修,中村纪夫,等.基于微粒子表面处理的ADC12压铸件疲劳强度改善.铸造工学（日）,2013,85（3）:155-160.铸件内部或外部缺陷是疲劳破坏的源头,因此压铸件表面存在的微小凸凹或机加工后显露出的内部缺陷成为疲劳破坏源头的几率非常高。采用直径为500800μm的粒子进行表面处理可提高疲劳强度,但波动加大,有时效果并不明显。而采用微粒子（20100μm）表面处理后的效果尚未探讨。试验合金为ADC12,试样在2 500kN压铸机上成形。试样分两类,一类是正常压铸的,一类是有意增加模具表面水分、油残留量后压铸的。
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发布时间：2023-12-18 - 摘要：<正>20140101砂模自动造型机液压系统,CN102814468A,2012.12.12,枣庄天源气动液压制造有限公司.本发明公开了一种砂模自动造型机液压系统,电机连接双联泵,吸油滤网通过管道连接双联泵,双联泵的出口连接单向阀Ⅰ,单向阀Ⅰ通过管路和油路集成块与比例溢流阀的P口相连通,电磁卸荷阀出油口A与比例溢流阀P口相连通成为油路集成块的总P口;比例换向阀P口和T口分别与油路集成块P口和T口相连通,比例换向阀A口和B口分别与二位四通电磁换向阀A口和B口相连通,比例换向阀A口和B口分别与油缸Ⅴ无杆腔和有杆腔相连通,二位四通电磁换向阀P口和T口均与油路集成块总T口相连通。用于造型机的液压系统,系统能保证挤压砂模达到合理的密度,系统设有油缸平稳卸压回路使拔模平稳,容易实现自动作业。
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发布时间：2023-12-18
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