最新刊期
卷 37 ， 期 1 ， 2017
- 摘要：The thermal diffusion processes of titanizing,chromtitanizing and compound chromizing-titanizing on Cr12 MoV steels were performed in a small pit type neutral salt bath furnace.Microstructure,phase constituent,thickness,hardness,wear resistance and corrosion resistance of the coatings prepared were tested and analyzed.The results show that surface microharness of three kinds of coatings are more than 3000HV0.05.Coating microhardness of chromtitanizing and compound chromizing-titanizing exhibits gradient change.Wear resistance and corrosion resistance of coatings after three kinds of TD treatment are improved greatly compared with those of the substrate.关键词：Cr12MoV;Chromtitanizing;Titanizing;Compound Chromizing-titanizing;Neutral Salt
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发布时间：2024-04-01 - 摘要：The Ti35Zr30Be24Cu7.5Co3.5bulk amorphous alloy rods with a diameter of 3mm were prepared by copper mold casting method.The friction and wear behavior of Ti35Zr30Be24Cu7.5Co3.5 bulk amorphous alloy was investigated by using the pin-on-disc friction tester.Worn surface morphologies of the samples were observed by a scanning electron microscope（SEM）,and the wear mechanism of Ti35Zr30Be24Cu7.5Co3.5bulk amorphous alloy was analyzed.The results show that,with the increase of loading from 10 N to 40 N,the wear rate of bulk amorphous samples is increased.The frictional coefficient is increased firstly and then decreased.Worn surface morphologies are changed from furrow and some peeling into the plastic flow with local shearing.Wear mechanism is gradually changed from abrasive wear to fatigue wear.关键词：Bulk Amorphous Alloy;Friction and Wear;Wear Mechanism
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发布时间：2024-04-01 - 摘要：The microstructure evolution of semi-solid Al-20Si-1Sm alloy during isothermal heat treatment process was observed.The results show that,with the increase of isothermal treatment temperature and time,the volume fraction of liquid phase is increased,and morphology of the eutecticα-Al phase is spheroidized with the grain size decrease at first and then increase.Meanwhile,the eutectic silicon exhibits feathery structure,and the primary silicon is decomposed into small polygonal particles.The desirable spherical eutecticα-Al phase can be achieved with 37μm and average size of the primary silicon is 30μm after treated at 610 ℃for 15 min.关键词：Al-20Si-1Sm Alloy;Semi-solid;Microstructure Evolution;Isothermal Heat Treatment
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发布时间：2024-04-01 - 摘要：<正>时间:2017年夏地点:待定1.会议主办单位中国机械工程学会铸造分会特种铸造及有色合金技术委员会复合材料技术委员会《特种铸造及有色合金》杂志社2.会议时间2017年夏（具体时间待定）3.会议地点具体地点待定4.征文内容（1）铸造有色合金(包括铝、镁、钛等轻有色合
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发布时间：2024-04-01 - 摘要：<正>据北京12月22日消息,中国海关公布的数据显示,中国2016年11月精炼铜进口量同比下降22.9%,至276 730t。中国2016年11月精炼镍进口量同比下降38.8%,至16 919t。中国2016年11月精炼锌进口量同比大降
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发布时间：2024-04-01 - 摘要：<正>近日,川崎（重庆）机器人研发生产基地,在重庆两江新区水土高新产业园正式投产。据悉,重庆生产基地项目投资2亿元,分两期建设,此次投产的为项目一期,一期将年产6000台机器人。日本川崎机器人是全球五大机器人品牌之一,于2015年4月正式签约落户重庆两江新区,投资2亿元人民币,建
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发布时间：2024-04-01 - 摘要：<正>近日,哈尔滨鑫科纳米科技发展有限公司自主开发研制的钛纳米聚合物防腐防垢涂料被上海、珠海等城市的企业看好,并在石化、供热、食品加工等诸多领域应用推广。据悉,这种钛纳米聚合物防腐防垢涂料采用纳米技术,具有耐腐蚀、耐高温、不结垢、导热性好等性能。
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发布时间：2024-04-01 - 摘要：<正>近日,中国台湾成功大学宣布,已成功研发出可用于牙床重建的镁再生网膜和骨科适用的镁骨钉两项生物自体分解新医用材料。该材料植入体内后,可不必取出,避免了经历二次开刀之苦。这项新型医用材料的研发,是成功大学医学院和工学
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发布时间：2024-04-01 - 摘要：<正>氮氧化物是现代城市大气污染物的最主要来源,光敏二氧化钛（TiO2）复合材料自20世纪90年代中期问世以来,以其能将大气氮氧化物催化氧化成无毒无害硝酸盐的独特功能,在欧盟范围内得到快速的商业化应用。混合约4%比例光敏复合材料的混凝土涂层技术,不仅具备自清洁
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发布时间：2024-04-01 - 摘要：<正>看好金属骨科器材产业市场需求,主营项目为铝合金产品的中国台湾延鑫金属集团与成功大学合作,创新研发医用材料──镁骨钉产品。相对于其他金属植入物,镁骨钉较为便宜,而且可以被人体吸收降解,随尿液排出,免受二次开刀之苦,成为骨科患者的一大福音。该团队将在两
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发布时间：2024-04-01 - 摘要：With the help of SEM and EDS,the impurity elements change in quartz sand surface before and after baking and resin sand fracture morphology were investigated.The results indicate that high temperature baking can remove effectively impurities in the surface of the sand,and reduce the gas evolution of quartz sand to improve the wettability of quartz sand,which is good for forming a complete,high strength bond bridge,leading to the fracture features of resin sand changed from the adhesive to the cohesive,improving greatly the strength of the resin sand.关键词：Quartz Sand;High Temperature Baking;Resin Sands;Strength
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发布时间：2024-04-01 - 摘要：The hot compression tests of as-cast RE-Mg AZ31 alloy were conducted at 250400 ℃ and0.0110s-1 by using the Gleeble-1500 D hot-simulator.Then the true stress-strain curves were obtained.The high temperature flow stress constitutive model parameters under steady flow stress were presented.The hot processing maps for the AZ31 alloy were drawn on the basis of dynamic materials model（DMM）.The results show that flow stress is increased with decreasing in temperature and increasing in strain rate.Combined with analysis of hot processing map and microstructure evolution,there exist two optimum hot deformation process areas,including strain rates of 0.030.8s-1 at 250325 ℃ and strain rates of 0.010.9s-1at 350400 ℃.关键词：As-cast RE-Mg Alloy;Hot Compression Deformation;Flow Stress;Hot Processing Map
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发布时间：2024-04-01 -
Microstructure and Properties of 6061-T6 Aluminum Alloy Joint Welded with ZL101A Welding Wire by MIG
摘要：Microstructure and properties of 6061-T6 aluminum alloy joint welded with ZL101 A welding wire by MIG after and before solid solution and aging treatment were investigated by optical microscope（OM）,scanning electron microscope（SEM）and computer-controlled electronic universal testing machine.The results show that there exist only three zones including matrix,fusion and welded zone.Mg2 Si strengthening phases and incomplete fusion phases are decreased in the matrix,however,Mg2 Si strengthening phases with increase and uniform distribution can be precipitated at the grain boundary and grain interior in the welded zone during aging treatment.The welding joints have the higher tensile strength and elongation in the weld zone,reaching 293.3 MPa and 6.8%,which are 94.6% and 56.7%of the base metal,respectively,so it is cracked at the welded zone.On the contrary,the untreated welding joints are cracked at the heat affected zone.Welded joints before and after treatment are characterized by typical ductile fracture.关键词：Welding Joint;Microstructure;Tensile Strength;Elongation- 2
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发布时间：2024-04-01 - 摘要：Considering of its structure,casting process of control rod was designed and simulated with the help of the View Cast software.The results reveal that shrinkage cavity and porosity can be easily generated in hot spots.In order to eliminate the defects,appropriate chilling blocks were designed and set at the hot spots.Simultaneously,insulating riser was used,and size and number of the riser were also designed.The optimized result shows that large defects can be eliminated effectively,which not only meet requirement of the casting,but also increase the production rate.And then,the castings were normalized at 900 920 ℃firstly,and then tempered at 580600 ℃.So hardness and tensile strength were measured.The results show that the tensile strength and hardness of the samples reach 815 MPa and285 HBW,respectively,meeting the pnduction requirement.
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发布时间：2024-04-01 - 摘要：Based on the microscopic phase-field dynamic model,the precipitation process of Ni75Al14Mo11 alloy was simulated at elastic strain energy B=800 and different temperatures.The microscopic morphology evolution,average order parameters and atom occupation probabilities were analyzed.The results show that L10 phases is precipitated from the Ni75Al14Mo11 alloy firstly,and most of them are L10（II）phases,then all of the L10 phases are transformed into L12 phase in the following time.With the both influence of temperature and elastic strain energy,the Ni75Al14Mo11 alloy clustering and ordering exhibit slight change.Ni atom trends to occupy the α and β1 positions,while Al and Mo atoms trend to occupy the β2 position,however,the occupation probabilities of Al atoms are much higher than Mo atoms,and they commonly form Ni3（Al、Mo）phases.Eventually,with the increase of the temperature at B=800,the occupation probabilities of Ni and Mo atoms are reduced,while the occupation probabilities of Al atom are increased at every position.关键词：Ni75Al14Mo11 Alloy;L10 Phase;Temperature;Clustering and Ordering;Occupation Probability
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发布时间：2024-04-01 - 摘要：By utilizing ANSYS CFX software,two kinds of different states（considering or not the liquid surface deformation）were simulated numerically for behavior of liquid level fluctuation in thin slab continuous casting mould with EMBR,and influences of magnetic flux density and magnetic position on the behaviors of metal jet and liquid level fluctuation were analyzed,meanwhile,effects of casting speed and variation law of level fluctuation index（F）on the behavior of liquid level fluctuation were described.The results indicate that,for different shape of free surface calculation models,with ignoring the surface deformation,the distribution of free surface velocity has a characteristics of the parabolic distribution,and maximum wave height of the meniscus is positioned at near the nozzle,while considering surface deformation,the velocity of steel/slag interface exhibits an obvious peak change,and maximum wave height of the steel/slag interface is located at near the narrow side of mould.By comparing the simulated results of the two situations under different processing parameters,under the reasonable parameter conditions,the simulation results of considering surface deformation and wave are more available.关键词：Static Magnetic Field;Continuous Casting;Meniscus;Steel/Slag Interfac;F Value
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发布时间：2024-04-01 - 摘要：The rapid sand casting aluminum alloy cylinder head of the engine was conducted.According to the characteristics of cylinder head,the top pouring and bottom pouring gating were taken into account.Through the UG NX 3D modeling,two kinds of gating systems were simulated by the ProCAST software to optimize the pouring parameters.The results reveal that through designing the gating system with single side-bottom pouring at 690 ℃ and 0.22m/s,the satisfied aluminum alloy cylinder head can be produced,meeting the requirements.关键词：Engine Cylinder Head;Numerical Simulation;Sand Casting Process
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发布时间：2024-04-01 - 摘要：Iron-steel material parts are the base of the industry.The squeezing casting iron-steel and its compound materials have the features of green,environmetal friendly and high quality,presenting the future direction of iron-steel manufacturing and forming.Progress in tensile behavior and wear resistance of squeezing casting iron-steel materials was reviewed.Meanwhile,technical principle,processing and developing prospect were described for squeezing casting roller,wear-resistant compound hammer,lined plate,braked disc and other parts.关键词：Iron-Steel Parts;Compound Materials;Squeezing Casting
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发布时间：2024-04-01 - 摘要：The characteristics of alkaline earth element Sr was described.The progress in effects of Sr on microstructures and heat resistance of magnesium alloy were reviewed.Through adding Sr,heat resistance of magnesium alloy was improved,and mechanical properties of the alloy were increased as a result of refining grain size.In addition,the problems of the magnesium with Sr were presented,such as refining mechanism,interaction with other alloying element as well as smelting and preparation of alloy,and the development trend was prospected.关键词：Sr;Magnesium Alloy;Heat Resistance;Development
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发布时间：2024-04-01 - 摘要：Effects of surface processing on microstructure of single crystal turbine blade were investigated by the means of OM（optical microscopy）,SEM（scanning electron microscopy）.The results indicate that microstructure of recrystallization in solid solution treatment samples after surface processing can be observed in all surface of specimens and the thickness of recrystallization zone layer is 20 to 75μm,and most of the recrystallized grain size is approximately 0.5mm.The surface of turbine blade in solid solution treatment is absence of recrystallization after surface processing.The cellular microstructure of specimen with solid solution treatment can be observed in surface and the thickness of cellular layer is in range of 2to 14μm after surface processing and aging treatmert.关键词：Surface Processing;Single Crystal Turbine Blade;Microstructure
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发布时间：2024-04-01 - 摘要：AZ91D magnesium alloy chips were used to prepare semi-solid billet by hot pressing and semisolid isothermal treatment.The microstructure homogeneity and evolution of the semi-solid billet during reheating were investigated by OM and SEM.The results indicate that under the hot pressing parameters,the density of hot-pressed billet can reach 1.76g/cm3,and the relative density reaches 98%.In the pressing process,the grains with obvious deformation characteristics are refined remarkably and distributed uniformly.Through semi-solid isothermal treatment,average diameter of particle is 98.6μm with average shape factor of 1.6,and the semi-solid microstructure exhibits very uniform.There exist three stages during reheating to semi-solid state:the dissolution of Mg17Al12,the melting of the region with high content of solute,and spheroidization and growth of solid particles.关键词：Magnesium Alloy Chip;Semi-solid Microstructure;Homogeneity;Microstructure Evolution
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发布时间：2024-04-01 - 摘要：ZA27 alloy was prepared by controlled diffusion solidification,and effects of precursor alloy composition on microstructure of the ZA27 alloy prepared were investigated.The results show that the grain size of ZA27 alloy can be refined,and the microstructure morphology is improved by controlled diffusion solidification.With increasing in Zn content in precursor alloy 2（Al-Zn-Cu-Mg alloy）,the chilling and forced convection of precursor alloy 1（Pure Zn）on precursor alloy 2are weakened,so the effect of controlled diffusion solidification on ZA27 alloy microstructure was decreased.When the content of Zn in precursor alloy 2is 0,the grain size with irregular particle structure is 95.9μm.When the content of Zn in precursor alloy 2reaches 10%,the grain size is increased to 103.8μm,and a part of equiaxed grain can be observed.Whereas it reaches 30%,the grain size is increased to 137.3μm,slightly less than 145.6μm of ones produced by traditional casting,and the dendritic morphology can be observed.After the content of Zn in precursor alloy 2is increased to 40%,the grain size of ZA27 alloy prepared reaches 145.4μm,which reveals that the effect of controlled diffusion solidification on microstructure of ZA27 alloy almost disappear.关键词：ZA27 Alloy;Controlled Diffusion Solidification;Precursor Alloy
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发布时间：2024-04-01 - 摘要：A graphitic serpentine channel pouring process was used to prepare the semi-solid hypereutectic Al-Si alloy slurry and to refine the primary Si phase in the alloy.Effects of different Si content and pouring temperature on the size and morphology of primary Si phase in hypereutectic Al-Si alloy were investigated.The results show that the primary Si phase can be refined significantly via the serpentine channel pouring process.The varied pouring temperatures from 15 ℃ to 45 ℃ above the liquildus were investigated.The results reveal the smaller and more homogeneous primary Si phase can be obtained with decreasing pouring temperature.The primary Si phase can be well refined with the low Si content.It is difficult to break primary Si phase with increasing melt viscosity,so the size of primary Si phase is increased with increasing in Si content.关键词：Hypereutectic Al-Si Alloy;Serpentine Channel;Semi-solid Slurry;Primary Si;Mophorlogy
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发布时间：2024-04-01 - 摘要：Using optical microscopy（OM）,differential scanning calorimetry（DSC）,X-ray diffractometer（XRD）and scanning electron microscopy（SEM）with energy dispersive X-ray analysis（EDX）,influences of pressure on microstructure and mechanical properties of the squeeze casting AZ91-1Ca alloys were investigated.Effects of pressure on grain refinement and casting defects in the alloy were analyzed theoretically.Mechanism of grain refinement and defect elimination in AZ91-1Ca alloy during squeezing casting process were described.关键词：Squeeze Casting;AZ91-Ca Alloy;Pressure;Microstructure;Mechanical Properties
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发布时间：2024-04-01 - 摘要：For the practical die casting aluminum alloy steering gear,JSCAST software was adopted to simulate the filling and solidification process,and through computed tomography（CT）scanning experiment,the characteristics,size and distribution of microporosity in the castings were analyzed and compared with the simulation ones.The results show that the holes in the steering gear mainly are small size,and the diameter defined as a sphere of an equal volume is between 0.261 and 0.288 mm.Gasshrinkage pore and shrinkage pore have a larger size,mainly distributed in the bigger thickness casting of two mounting holes and the connection of rack and pinion shaft with complex shape.The intermediate positions of steer gear generate a large number of gas-pores as a result of the convergence of liquid metal.关键词：Die-casting ADC12;Numerical Simulation;3D X-ray Tomography;Microporosity
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发布时间：2024-04-01 - 摘要：Ductile cast iron wheel was manufactured by lost foam casting.The process of lost foam casting was analyzed systematically.The filling,solidification and temperature field distribution in the iron wheel during pouring process were simulated by Anycasting software.The microstructure and defects in the castings were investigated by XRD and scanning electron microscope（SEM/EDS）.The results show that the filling velocity in the designed feed system is improved greatly by vacuum pressure,and some sand sticking and hole defects can be observed in some castings due to the low refractoriness of sintered coating layer.关键词：Lost Foam Casting;Ductile Iron;CAE Simulation;Defects
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发布时间：2024-04-01 - 摘要：Three high-entropy alloys including Al0.3CrFe1.5MnNi0.5（A0）,Al0.3CrFe1.5MnNi0.5Ti0.2（A1）and Al0.3CrFe1.5MnNi0.5Si0.2（A2）,were prepared by non-consumable vacuum arc melting furnace.The phase,microstructure and hardness of the aged alloys with aging at 700 ℃ to 1 000 ℃ for 12 hwere characterized.The results show that three kinds of as-cast alloys are mainly composed of BCC phase.The aged alloys are mainly composed of a mixed structure of rich（Cr,Mn,Fe）BCC phase,Cr5Fe6Mn8（ρphase）precipitates and spherical Ni-Al phase.Because of precipitation of Ni-Al phase andρphase,the A0,A1 and A2 aged alloys have the maximum hardness of 899 HV,943HV and 955 HV,which is improved by 142%,154%,and 157% compared with that of the as-cast A0 alloy,respectively.After aging treatment at 1 000℃,hardness of the A1 and A2 aged alloys is still stayed up over 800 HV,exhibiting agood aging hardening behavior.关键词：High-entropy Alloy;Microstructure;Aging Treatment;Precipitation Hardening
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发布时间：2024-04-01 - 摘要：<正>太空3D打印正受到各航天大国的青睐,在美国将3D打印机送入国际空间站后,俄罗斯研究人员也宣布制成了该国首台太空3D打印机样机,计划在进一步完善后,在2018年送入国际空间站进行测试。上述3D打印样机由位于西伯利亚的托木斯克理工大学高科技物理研究所等4家单位联合研制。该研究所副所长科卢巴耶
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发布时间：2024-04-01 - 摘要：<正>近日,奎克化学在长春与一汽大众签署了为期三年的化学品管理服务外包的合同。奎克化学将于2017年1月1日起,全方位管理一汽大众位于长春的发传厂的所有工艺油品,包括设备中各类工艺油品的检测及监控,日常维护以及化学品的供应链管理。
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发布时间：2024-04-01 - 摘要：Alumina particle reinforced aluminum matrix composites were prepared successfully by in-situ reaction in melt after adding SiO2 powder into aluminum melt via semi-solid mechanical stirring technique.The fabrication of the composites under different squeezing pressures was also investigated.The micro-structure and phase constituent of the composites prepared were analyzed by scanning electron microscope and X-ray diffraction,meanwhile,the tensile properties of the composites were measured.The results reveal that the internal defects of squeeze-casting composites are decreased greatly,and the reinforcement particles are distributed homogeneously into the composites.With the increase of squeezing pressure,the tensile strength,hardness and elongation of both the as-cast and T6heat-treated composites are the higher than those of the matrix ZL109 alloy.Meanwhile,these properties are increased with the increase of squeezing pressure.关键词：α-Al2O3;Aluminum Matrix Composites;Squeezing Casting;Microstructure
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发布时间：2024-04-01 - 摘要：The relationship of annealling temperature and time with copper-aluminum composite laminate thickness was analyzed.The results reveal that thickness of copper-aluminum composite laminate is increased with increasing in the annealing temperature and time.The peeling strength of copper-aluminum composite laminate is increased firstly and then decreased with the time increase at a fixed heating temperature.The maximum peeling strength of copper-aluminum composite laminate when the heating treatment temperature is the lower.The peeling strength is related with diffusive motion on the boundary in diffusion process.The relation of peeling strength and thickness of diffusion layer were presented through fitting the data,and relation model of peeling strength and heat treatment technology was established,which provided a theory reference for optimizing heat treatment technology.关键词：Copper-Aluminum Composite Laminate;Diffusion Layer Thickness;Heat Treatment
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发布时间：2024-04-01 - 摘要：The lateral compound Cu/Al composites were fabricated by Conclad continuous extrusion at500 ℃,which has a relatively good interface straightness,thickness of the intermetallic compound of93μm and the higher interface bonding strength.The mechanical properties,interface morphology and microstructure of the composites were analyzed.The results indicate that the hardness is inceased significantly nearby the interface,and the tensile strength of interface reaches 48 MPa.The interface intermetallic compand can be observed in compound interface,which is Cu9Al4、CuAl and CuAl2 phase form copper side to aluminum side,besides of the copper matrix and aluminum substrate.Fracture is easy to appear in the interface because of the presence of CuAl2 brittle phase.关键词：Lateral Complex;Cu/Al Composites;Conclad Continuous Extrusion;Intermetallic Compound
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发布时间：2024-04-01 - 摘要：Effects of pulsed magnetic field（PMF）on the solidified microstructure and mechanical properties of in situ Mg2Si/Mg-7Al composites were investigated.Experimental results show that,with increasing in discharging voltage,the Mg2Si phase in the composites prepared is further refined,and the morphology of Mg2Si phase is transformed from equiaxed dendritic to particle-like structure,and the morphology ofβ-Mg17Al12 is converted from discontinuous net-like structure to island-like and particlelike ones with more uniform distribution.The mechanical properties of the composites treated by PMF were improved significantly.The tensile strength and elongation of the composites treated by PMF at300 Vare increased by 37.3% and 137.5%,respectively,compared with those of the composites untreated by PMF.关键词：Pulsed Magnetic Field;Mg2Si/Mg-7Al Composites;Discharging Voltage;Microstructure;Mechanical Properties
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发布时间：2024-04-01 - 摘要：The method of hydrogen reduction for preparing metal chromium was proposed.The thermodynamic process of hydrogen reduction Cr2O3 or K2Cr2O7 was described,and influences of dynamic factors were analyzed,such as additives,hydrogen flow rate,reaction time and temperature on hydrogen reduction of Cr2O3 and K2Cr2O7.The result of reaction system was analyzed by XRD and weight loss rate.The results reveal that Cr2O3 and K2Cr2O7 can be restored by H2 in the system with the water pressure and hydrogen partial pressure ratio less than 10-5 at 1 200 ℃for 3h through controlling the hydrogen flow rate at 1L/min and adding 1%Cr,and reduction effect of K2Cr2O7 exhibits desirable.关键词：Hydrogen Reduction;Weight-loss Ratio;Chromium;Clean Preparation
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发布时间：2024-04-01 - 摘要：Cu-Ni-Si-Fe-P alloy was prepared by adding a small amount of Fe and P elements into the CuNi-Si alloy.Effects of heat treatment on the electrical conductivity,hardness and microstructure evolution of the Cu-1.7Ni-0.5Si-0.27Fe-0.03 Palloy were investigated by hardness tester,EDS,XRD and SEM.The results show that with the increase of solution temperature,the dendritic precipitates in the alloy are dissolved gradually,and the precipitates are dissolved fully in the matrix after 850 ℃×1hsolution treatment.Hardness of the alloy is declined rapidly with the increase of solution temperature to107.39 HV,and conductivity of the alloy is decreased slightly to 12.75 MS/m.After aging treatment,the conductivity and hardness of the alloy are improved greatly.After 850 ℃×1hsolution treatment and 500 ℃×3haging treatment,the hardness,electric conductivity and soften temperature of the alloy reach 208.10 HV,23.78 MS/m,568.7 ℃,respectively.At initial stage of aging treatment,the NiSiFeP particle compounds are precipitated,and the compounds are decomposed to form FeP and NiSi compounds with the smaller size at the later stage of aging treatment.关键词：Cu-Ni-Si-Fe-P Alloy;Electric Conductivity;Hardness
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发布时间：2024-04-01 - 摘要：The size,microstructure and hardness at different deformation sections of TA18tubes（Φ25mm×5 mm）after two-roll cold-rolling processing were investigated.The experimental results show that microstructure of TA18 alloy tubes is changed from annealing state into rolling state,and the morphology of grains is transformed into fibrous shape from equiaxed shape after cold rolling.The concentrated plastic deformation occurs in the reduction period,resulting in the severe working hardening of the tubes,so hardness of the tubes is increased from 222HV1 to 267HV1.Through reducing the empty size,the wall quality of tubes can be improved effectively.关键词：TA18;Two-roll Cold-rolling;Microstructure;Hardness
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发布时间：2024-04-01 - 摘要：Al-0.7Fe-0.4Mg-0.1Si alloys with different Er content were prepared.The microstructure of the alloy at as-cast,squeezed and wire state was analyzed by OM,SEM,EDS,TEM and other methods.The mechanical properties and electrical conductivity of the alloy were measured to determine effects of Er content and different preparation process stages.The results show that Er element can generate the Al3Er phase with Al element in the cast alloy as the nucleus to refine microstructure.After extrusion and drawing into wire,the microstructure is further refined.The tensile strength and electrical conductivity of the alloy wire can be decreased with adding excessive Er element.And the suitable addition amount of Er elements is 0.2%,where tensile strength,elongation and conductivity of the wire reach 273.90 MPa,21.32% and 31.69 MS/m,respectively.关键词：Electric Aluminum Alloy;Rare Earth Element Er;Microstructure;Property
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发布时间：2024-04-01 - 摘要：By metallographic microscope,scanning electron microscopy（SEM）,X-ray diffraction and other equipment and analysis,influences of Sn on microstructure and corrosion resistance of the as-cast Mg-2.7Nd-0.4Zn-0.5Zr-xSn were investigated.The results reveal that as-cast Mg-2.7Nd-0.4Zn-0.5ZrxSn（x=0.5,1.0,1.5,2.0）alloys are composed ofα-Mg matrix,Mg12Nd phase,particulate or rod-like Mg2Sn phase.With increasing in Sn content,Mg2Sn phase is increased gradually.The corrosion rate of as-cast alloy presents a trend of decreasing firstly and then increasing with Sn content increase.When Sn content is 1.0%,the alloy has the desirable corrosion resistance.The addition of Sn can refine Mg12Nd phase,and generate more stable Mg2Sn phase with more uniform distribution with 1.0%Sn content.关键词：Sn;Mg-Nd-Zn-Zr;Microstructure;Corrosion Resistance
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发布时间：2024-04-01 - 摘要：AZ31 magnesium alloy sheet was welded by MIG.Effects of process parameters on droplet transfer,jointing formation,microstructure and properties of the joint were analyzed.The results reveal that with increasing in current,the voltage in the range of one volt is gradually reduced,and the droplet is evolved into globular transferring into the projected transferring to the spray transferring successively,and droplet size is correspondingly reduced.In addition,arc height is reduced with widening the width.With the current more than 180 A,welding joint exhibits desirable.With the current increase and the voltage decrease,bead width,penetration depth and reinforcement are increased with decrease of the aspect ratio.Grain size in welding joint is much smaller than that of heat-affected zone.With the linear energy increase,the grain size in welding joint and heat affected zone are increased,however,the hardness is decreased.关键词：AZ31 Magnesium Alloy;MIG Welding;Metal Transferring;Microstructure;Micro-Hardness
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发布时间：2024-04-01 - 摘要：<正>《特种铸造及有色合金》杂志是对国内外公开发行的中文核心期刊。为保证期刊的高水平和高质量,特对稿件提出如下要求:1.总体要求文章要遵循"科学性、先进性、实用性"的原则,做到主题鲜明,重点突出,层次清楚,语句通顺。每篇文章的篇幅(含图、表)一般不超过5000字。勿一稿多投,其他刊物上发表过或拟用之稿件,本刊不予录用。欢迎
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发布时间：2024-04-01 - 摘要：<正>时间:2017年5月23日;地点:重庆市雾都宾馆太阳城（★★★）一、会议主办单位重庆铸造行业协会二、会议协办单位（排名不分先后）重庆捷力轮毂制造有限公司重庆硕龙科技有限公司重庆力劲机械有限公司重庆新红旗缸盖制造有限公司广东伊之密精密机械股份有限公司迪砂、维尔贝莱特公司济南圣泉集团股份有限公司重庆市立嘉会议展览有限公司
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发布时间：2024-04-01 - 摘要：<正>主办单位:中国机械工程学会铸造分会消失模与V法铸造技术委员会承办单位:华中科技大学材料成形与模具技术国家重点实验室协办单位:山西华翔集团支持媒体:《特种铸造及有色合金》杂志、全国消失模与V法铸造技术网站(www.xsm-
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发布时间：2024-04-01 - 摘要：<正>由中国铸造协会主办的"2017中国第二十二期消失模铸造技术培训班",由富阳市联发消失模成型没备有限公司和陕西法士特集团铸造公司承办,将于2017年4月15报到,16-18日在陕西宝鸡法士特集团铸造公司举办。学习费用:中铸协消失模分会会员并且已交
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发布时间：2024-04-01 - 摘要：<正>《特种铸造及有色合金》杂志,是中国科学技术协会主管,中国机械工程学会主办的全国性期刊,为国内外权威数据库及检索系统收录,并获得全国优秀科技期刊一等奖、国家期刊奖和新中国60年有影响力的期刊。本刊主要报道各种（黑色和有色合金）特种铸造方法,如:熔模铸造、压铸、低压铸造、挤压铸造、差压铸造、半固
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发布时间：2024-04-01
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