最新刊期
卷 31 ， 期 11 ， 2011
- 摘要：Vacuumming of die cavity is an effective way of producing quality castings free of defects associated with cavity gases.After an evaluation of the vacuuming behaviors of the vacuuming die casting technologies currently used in industry,it was pointed out that the dissatisfaction of current technologies steams from the commonly low vacuuming rate needed to effectively stop the melt flow from pennetrating into vacuuming system.In accordence with the vacuuming knetics of a die cavity,it is highlighted that an effective vacuuming relies on the kinetic response rate of the vacuuming system and the vacuum degree achieved before high speed die-filling in condition that the vacuuming channel could be effectively closed up.Enlarging the diameter and reducing the length of the vacuuming channel are the key criteria to a successful exhausting channel design.The application of a new type vacuuming system meeting the mentioned criteria was shown.关键词：Vacuum Die Casting;Gas Flow;Gas Hole;Exhausting Channel
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发布时间：2023-12-18 - 摘要：<正>据新德里10月30日消息,因国内行业对征税的需求并不强烈,印度税务部已终止对中国进口铝征收保障措施关税的审查。印度财政部公告显示:"特此声明,终止对中国出口平轧铝材和铝箔的保护措施调查。"
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发布时间：2023-12-18 - 摘要：<正>金属导报消息,由于欧元区经济存在不确定性,需求放缓,欧洲市场226再生铝合金价格从1780～1860欧元/吨降至1760～1850欧元/吨,南欧地区成交量较低,北欧地区供货商的成交量较多。有生产商称,市场行情并没有
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发布时间：2023-12-18 - 摘要：<正>奎克化学在伊利诺伊州皮奥利亚市举行的STLE（摩擦与润滑工程师协会）中伊利诺伊分会上发表了关于"蠕墨铸铁的加工与润滑"的研究成果。蠕墨铸铁（CGI）比普通的灰铸铁的硬度更高可以制造出更薄壁更轻的发动机
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发布时间：2023-12-18 - 摘要：<正>俄罗斯拥有世界1/3的稀土资源,但是进行开发并完全填补中国减产造成的全球供应缺口,还至少需要10年时间。在包含17种元素的稀土市场中,中国拥有约5%的份额。这些资源被用于从混合动力汽车到风力发电站等很多
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发布时间：2023-12-18 - 摘要：Solidification structure and crystal growth of the TiC-TiB2 fine-grained ceramics which was prepared by combustion synthesis under high gravity were investigated,and the relationship between microstructure and fracture behavior as well as toughening mechanism was analyzed by XRD（X-ray diffraction）,FESEM（field emission scanning electron microscope） and EDS（energy dispersive spectrometer）.The results show that the composite ceramics matrix is composed of a lot of fine TiB2 platelets and irregular TiC grain surrounded the TiB2 platelets.The formation of TiB2 platelets is resulted from faceted crystal growth while irregular TiC grains are the results of non-faceted crystal growth and high growth velocity.Relative density,Vickers hardness,bending strength and fracture toughness of the ceramics reach 98.6%,21.8 GPa,650MPa and 12.5 MPa·m1/2,respectively.Ceramic toughening mechanism is attributed to the co-operation of crack deflection,crack-bridging and pull-up by small-size TiB2 platelets and frictionally-interlocking in-situ toughening effects.关键词：TiC-TiB2 Composite Ceramics;Rapid Solidification;Fine-grained Microstructure;Fracture Behavior;In-Situ Toughening
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发布时间：2023-12-18 - 摘要：Effects of P-RE compound modification on tensile properties at room temperature and fracture morphology of hypereutectic Al-20Si alloy were investigated.The results show that both primary Si phase and eutectic Si phase in the Al-20Si alloy with P-RE modification are refined effectively,where primary Si is converted into the near-spherical structure,and eutectic Si phase is transformed into the particle or short rod-like one.Meanwhile,the size of the primary Si phase and eutectic phase is decreased from approximately 100 μm to 1015 μm and to lower than 1μm,respectively.Tensile strength of the alloy with P-RE modification is improved by approximately 100% compared with that of the matrix alloy.The fracture morphology of the alloy modified is composed of fine cleavage plane and tearing edge,dimple among the cleavage plane.In addition,plenty of dimple bands gathered in boundary among cleavage steps can be observed.关键词：Hypereutectic Al-20Si Alloy;P-RE Compound Modification;Microstructure;Tensile Properties;Fracture Morphology
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发布时间：2023-12-18 - 摘要：Inclusion content has the great effects on the mechanical properties of the steel.The steel ladle slag is the main way to introduce inclusion into steel,so it is the key problem to prevent and control slag process in continuous casting production.The mixture phase moving process of molten metal and slag particles in bottom pouring steel ladle of continuous casting have been simulated by discrete phase model.The moving path of thirty slag floating particles selected at random has been tracked.Two stages,surface layer converging stage and rapidly involving stage,have been simulated.The results show that,although the moving path of single particle exhibits random direction,the whole movement of the slag particle cluster exhibits statistics characteristics.Based on the mentioned results,effects of slag particle size and density on slag height and time in steel ladle were analyzed.Average slag height and time are closely related with the slag particle size,while effects of slag particle density can be ignored.关键词：Continuous Casting;Slag Particle;Discrete Phase;Moving Path
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发布时间：2023-12-18 - 摘要：The Al-bronze alloy was melted in a gas protection induction furnace to prepare the ingot.The ingot was hot rolled to plate and then water quenched immediately.The plates were cold rolled with the reduction of 40%,50%,60%,70% and 80%,respectively,and then annealed at 700 ℃ for semi-finished plates as well as annealed at 650 ℃,700 ℃ and 750 ℃ for 2 hours for finished ones,respectively,meanwhile,cold deformation with reduction of 20%,40% and 60% was conducted,respectively,before finished annealing treatment.Effects of thermo-mechanical treatment on the precipitates and transformation kinetics were investigated by optical microscope（OM） and transmission electron microscope（TEM）.The results show that transformation kinetics is increased with increasing in annealing temperature and in cold deformation.With 60%80% cold deformation and middle annealing at 700 ℃ for 2 hours and 20%40% cold deformation +finished annealing at 650750 ℃ for 2 hours,fine and uniformly distributed precipitates in the alloy with high comprehensive properties can be observed.关键词：Al-Bronze Alloy;Thermo-Mechanical Treatment（TMT）;Microstructure;Transformation Kinetics
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发布时间：2023-12-18 - 摘要：<正>江西于都县委书记蓝捷在出席江西省第十三次党代会时指出,于都县将紧紧抓住机遇,瞄准省、市政策取向和产业发展方向,立足赣州核心区的产业配套基地,积极参与区域分工,发展壮大钨、铅锌银等资源型产业,积极培育壮大钨硬质合金、铅锌
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发布时间：2023-12-18 - 摘要：<正>天润曲轴股份有限公司创建于1954年,是以生产"天"牌发动机曲轴为主导产品的中国规模最大的曲轴专业生产企业之一。公司拥有年产50万支曲轴毛坯的德国KW铸造生产线、50万支曲轴毛坯的锻造生产线和奥地利气体软氮化曲轴生产
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发布时间：2023-12-18 - 摘要：<正>据悉,宝钢工程技术集团宝菱重工历时两年多建设的铸铁技改项目,于2011年10月正式完工投产。该项目设计年产能力可达8000吨,将为提高宝菱重工拳头产品之一的制管工具市场占有率,起到重要作用。铸铁技改能力提
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发布时间：2023-12-18 - 摘要：<正>10月14日下午,张家川回族自治县主要领导会同相关部门,深入恭门镇原张家川县钢铁有限公司、恭门镇火车站站前广场,对100万吨铸造产业化基地建设项目前期准备情况进行了实地调研,要求相关部门要切实加大东部
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发布时间：2023-12-18 - 摘要：<正>连日来,福建华侨经济开发区城南工业园区内,鑫宇有色金属制品有限公司车间人机忙碌。前三季度,公司完成生产总值7.57亿元。近年来,宁化县依托资源优势,大力建设有色金属材料制造业基地,以钨、铜、铝产业为主导
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发布时间：2023-12-18 - 摘要：Through analyzing technological process for aluminum engine cylinder head,three sets of gating systems,such as pouring with slit top feeding riser,direct pouring with top riser and pouring with half-open and half-enclose runner,were designed.Visualization of filling and solidification of liquid aluminum alloy was carried out by the simulation software.It is presented that the gating system with slit top feeding riser is the desirable design.The optimized processing parameters are as follows:preheating mould at 400 ℃ and pouring at 720 ℃.Based on the optimized processing parameters,the dynamic visualization of filling and solidification of liquid aluminum alloy was conducted,and filling time,solidification time,and distribution and volumetric fraction of possible shrinkage porosity（hole） and gas hole were predicted,providing a reference to the practical production.关键词：Cylinder Head;Gating System;Numerical Simulation;Filling and Solidification
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发布时间：2023-12-18 - 摘要：Based on the theory of computer graphics concerned with the OpenGL,the key techniques of implementation of some functions such as STL preview,STL assembly and STL adjustment in pre-process module of foundry CAE system were investigated,including reading and writing of STL file,drawing of triangular facet,drawing of mold model with transparent effects,three-dimensional coordinate transformation of the whole mold system and calculation of normal vector of triangular facet,etc.A grap-handling program with the techniques mentioned above was developed and incorporated into the CAE system self-developed.The application of the system shows that those techniques are much contributive to making a reasonal plan of mesh generation.关键词：Open GL;Foundry CAE System;Mesh Generation;Preview;Assembly;Adjustment
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发布时间：2023-12-18 - 摘要：We have developed an interlacing type double power ultrasonic vibration heads equipment to treat A356 aluminum alloy melt to obtain semi-solid slurry.Effects of different pouring temperature and different inclined angle of flow runner as well as front and back arrangement of flow runner of ultrasonic transducer with 1000W and 1500W on microstructure of semi-solid A356 alloy slurry were investigated.The results show that obvious refinement of microstructure of A356 alloy can be observed by double ultrasonic vibration heads with inclined runner,however,refinement of microstructure of A356 alloy is changed with different inclined angles.The desirable primary phase size with desirable spheroidized effects can be obtained with vibrating at 620 ℃ and inclined angle of 40°.关键词：Power Ultrasonic;Double Vibration Head;A356 Alloy;Semi-solid
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发布时间：2023-12-18 - 摘要：The hypereutectic Al-17Si alloys containing 2%,3%,4%,5%Fe（Wt.%） were treated by direct ultrasonic vibration（USV） treatment.The microstructures of the alloys which were produced by conventional casting process and semi-solid forming with USV treatment were investigated by OM（optical microscope）,XRD（x-ray diffraction）,and EDS（energy dispersive spectrometer）.The results reveal that a large amount of long needle-like β-Al5FeSi phase with a little plate-like δ-Al4FeSi2 phase can be observed in the as-cast Al-17Si alloy containing 2%Fe without USV treatment.With the increase of Fe content,the amount of long needle-like β-Al5FeSi phase is decreased gradually,and the plate-like δ-Al4FeSi2 phase is increased in the Al-17Si alloys.The coarse plate-like δ-Al4FeSi2 phase is dominant in Fe-rich phases in the Al-17Si alloy containing 5%Fe.The alloy melt with different Fe content was treated by USV near the liquidus temperature for a certain time,and then was poured into a permanent mold.The results indicate that blocky and short-rod δ-Al4FeSi2 phase is dominant in Fe-rich phases,and the average grain size of δ-Al4FeSi2 phase is refined to 1846μm,and a little needle-like β-Al5FeSi phase is remained.The mechanism of USV refining Fe-rich phase in the Al-17Si alloys was discussed.关键词：Al-Si-Fe Alloy;Ultrasonic Vibration;Fe-rich Phase;Morphology
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发布时间：2023-12-18 - 摘要：Based on blanking drawing of piston and design of mould,squeezing casting 190 type Al-Si piston was conducted.The rational processing parameters for squeezing casting 190 type Al-Si alloy piston are as follows:pressure of 71.379.2 MPa,pressure time less than 60 s,pressure velocity of 0.0040.006 m/s,and holding pressure time of 110130 s.In addition,the pre-heating of mould,coating and pouring as well as slag removal were described.关键词：190 Type Al-Si Piston;Squeezing Casting;Pouring
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发布时间：2023-12-18 - 摘要：The corrosion behavior of A380 and A360 alloy prepared by permanent mould casting was investigated,and its corrosion mechanism was approached.Corrosion rate of the alloys was measured by the immersion experiment in 3.5% NaCl solution.Meanwhile,morphology of corrosive product and the matrix were observed by optical microscope and scanning electron microscope with energy dispersive spectroscopy.The corrosion mechanism was analyzed with the help of electrochemical polarization curves.The results reveal that the corrosion rate of the A360 alloy is lower than that of A380 alloy.Pitting erosion can be observed on both the A380 alloy and A360 alloy in 3.5%NaCl solution,and white-loccular corrosion product are distributed on the surface of the samples.However,the pitting erosion occurred in A380 alloy is more serious than that in A360 alloy.Meanwhile,the corrosion morphology and corrosion mechanism are obviously different in A380 alloy and in A360 alloy.关键词：Al-Si-Cu Alloy;Permanent Mould Casting;Corrosion Resistance;SEM-EDS;Polarization Curves
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发布时间：2023-12-18 - 摘要：The formation process of a large complex aluminum alloy parts was simulated by the Procast software to optimize processing parameters.Based on simulated results,the processing parameters of forming the parts were optimized.The production of the alloy parts was completed successfully with the help of the Procast software.关键词：Numerical Simulation;ProCAST Software;Aluminum Alloy Parts
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发布时间：2023-12-18 - 摘要：Blades with excellent high temperature performance are increasingly required with the development of industrial gas turbine.Industrial gas turbine blade exhibits complex shape and thickness as well as thin-walled structure with complex cavity in blade body,which results in the inevitable occurrence of shrinkage porosity（hole） in the blades.In order to investigate the defect formation and to optimize the processing parameters,the fluid field and temperature field are simulated by the FEM to predict the formation of shrinkage porosity（hole） during solidification process.The results show that confluence of liquid alloy occurs at the middle of pressure side,resulting in the formation of gas entrapment.The ingate on top of the tenon solidified in advance as a result of thin wall and blocked the feeding channel between the riser and the bottom of tenon,leading to the occurrence of shrinkage porosity（hole） in the tenon as well as in both gating systems.The practical experiment was conducted.The results are well in agreement with the simulated ones in shrinkage porosity and gas-entrapment.To eliminate the defects,the larger ingate was designed at the proper location to improve the gating system.关键词：IGT Blades;Investment Casting;Numerical Simulation;ProCAST Software
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发布时间：2023-12-18 - 摘要：<正>集中国传统青铜铸造工艺与艺术鉴赏于一体,深层次剖析铸造深邃内涵的经典之作!本书是令读者愉快阅读、开拓视野的鉴赏性读本。本书采集了来自生产一线的工艺案例,反映了当今在大型青铜雕塑中全球领先的技术
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发布时间：2023-12-18 - 摘要：Facing increasingly serious shortage of workers in foundry enterprise,the formation,features,distribution of shortage of worker were analyzed from micro-and macro aspects.Based on human resource management theory,typical samples and employment misunderstanding existed in some enterprises were approached.Finally,some constructive suggestions and measures were presented.关键词：Foundry Enterprise;Shortage Of Workers;Human Resource
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发布时间：2023-12-18 - 摘要：<正>2011年10月16日,全国铝及镁合金熔铸技术交流会在浙江杭州永汇国际大酒店召开。本次交流会旨在广泛交流铝、镁合金在熔铸和铸轧方面的技术创新成果,推广新技术、新应用。节能减排、推进低碳经济是我国经济
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发布时间：2023-12-18 - 摘要：Alloy element and RE were added into the partial model of LFC casting to meet the special properties of partial component during LFC process.Alloy elements and RE can be dissolved into the corresponding position of the LFC castings.The results show that partial alloying treatment can effectively improve the partial special property requirements of LFC components.关键词：LFC;Partial Components;RE;Alloying Element
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发布时间：2023-12-18 - 摘要：The production process of valve body of DN300 flange swing check valve by EPC was introduced,including gating-riser system design,pattern making,mold assembling and pouring.Bead density is 2326 g/dm3,and molding is conducted by the tool.Meanwhile,vacuum flask was exhausted by five direction,and varied frequency plain jolter with hydraulic clamping mechanism was adopted.In addition,vacuum rate is 0.050.06 MPa for 5 min during pouring process.关键词：Swing Check Valve;Valve Body;EPC;Gating System Design;Primary Spheroidization Treatment
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发布时间：2023-12-18 - 摘要：Processing layout and matching design of key parts for water-cooling permanent mold centrifugal machine with aperture less than 300 mm were introduced to improve production efficiency of the equipment.Three work-station arrangements were designed to shorten time of the auxiliary process and accelerate production rhythm.Accuracy segmentation control was realized for cooling location and time of pipe mold by segment cooling system for centrifugal main machine to effectively decrease cooling time of the produced parts.Through the in-time feedback of current signal to adjust hydraulic mechanism,error correction control can be realized,and precision equivalent pouring of seg-ladle can be ensured.关键词：Nodular Cast Iron Pipe;Water-Cooling Permanent Mold;Centrifugal Cast Pipe Machine
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发布时间：2023-12-18 - 摘要：Aiming at problems in conventional tilting pouring device,fixed tilting quota pouring device was developed.Control strategy was presented and electrohydraulic proportional system was designed.Weak balance during pouring process and low automatic control ability were resolved.关键词：Tilting Type Furnace;Fixed Pouring;Angular Displacement Quantitative Control;Electrohyfraulic Proportion
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发布时间：2023-12-18 - 摘要：The TiC-coated diamond/Al composites with 65% diamond in volume fraction were fabricated by gas pressure infiltration method.The microstructure and coefficient of thermal expansion（CTE） were analyzed and measured,respectively,to understand the thermal expansion behavior of the TiC-coated diamond/Al composites.The results show that the uniform distribution of diamond particles in the Al alloy with compact microstructure can be observed.The TiC coating is considered to improve selective interfacial bonding between diamond particles and Al alloy effectively and enhance the interfacial bonding.The CTE of the composites is decreased obviously as a result of TiC coating.The CTE of composites with TiC coating can be predicted by the mean value of the Turner and Kerner models,while the CTE of the composites without coating can be predicted by the Kerner model.关键词：Composites;Microstructure;Coating;CTE
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发布时间：2023-12-18 - 摘要：SiCp/ZL101A composites were prepared by hot-presses sintering process（HPS） with SiC particles of 10%,20%,30% and 40% in volume fraction.The hardness and dry frictional wear behavior at room temperature were measured,and the wear mechanism was approached.The results show that,with increasing in volume fraction of SiC particles,hardness of the composites is increased,and the maximum hardness value can be observed in the composites with 30% SiC content.The wear mechanism of the matrix ZL101A alloy is characterized by adhesion wear,while wear mechanism of the composites is characterized by adhesion wear with a little abrasive wear.With increasing in volume fraction of SiC particle,the adhesion wear is gradually reduced,which is responsible for the improvement of wear behavior of the composites.关键词：Composites;Hardness;Wear Behavior
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发布时间：2023-12-18 - 摘要：Si diffusion from cladding layer to core material easily occurred in the composite brazing sheet of 4343/3005/4343 during brazing process,which affected the brazed joint formation and mechanical properties.Effects of core-material microstructure on diffusional solidification behavior in 4343/3005/4343 three-layer aluminum brazing sheet were investigated by DSC（differential scanning calorimetry）.The results show that molten 4343 cladding layer can be solidified completely with holing temperature at 605 ℃which is more than the melting point.The core material microstructure has the significant effect on the diffusional solidification process.The molten cladding alloy can completely solidified at 605 ℃ for 30 min when core material has fine equiaxed grains.Core material with coarse and long strip grains can greatly decrease the Si diffusion velocity as a result of small grain boundary density and high fraction grain boundary with low angle,which results in the 50% molten cladding materials solidification at 605 ℃ for 30 min,and the cladding layer can be completely solidified completely with holding for 120 min.关键词：Three-layer Aluminum Brazing Sheet;Diffusional Solidification;DSC;EBSD（Electron Back Scattering Diffraction）
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发布时间：2023-12-18 - 摘要：Nano-Al2O3/2024 composites were fabricated by the pre-dispersion of ball milling and stirring casting,and microstructure and properties of the composites were investigated.The results show that the particles clustering in the as-received powder are eliminated effectively after the pre-dispersion treat ment of ball-milling,and the isolated Al2O3 nano-particles are uniformly dispersed on the surface of Al powder.Addition of the milled nano-Al2O3/Al composite powder instead of raw nano-particles can alleviate the problems associated with poor wettability,agglomeration and the nano-particle dispersion in the melt,realizing the homogeneous distribution of the nano-particle in the matrix.Mechanical properties of the composites are improved remarkably with introducing nano-particle.Compared with those of the composites prepared by conventional stirring casting,the tensile strength,yield strength and micro-hardness of the prepared Al2O3/2024 composites are increased by 59%,58% and 67%,respectively.关键词：Aluminum Matrix Composites;Ball Milling;Stirring Casting;Al2O3 Nano-Particle
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发布时间：2023-12-18 - 摘要：Large thin-walled Al-Mg alloy housing for food machinery was usually produced by green sand casting or semi-permanent mold integrating with semi-green sand mold casting because of the easy occurrence of hot crack of Al-Mg alloy in permanent mold.A tilting gravity casting was presented to eliminate the problems in permanent mold casting.Considering mould design and adjusting the pouring parameters,large thin-walled Al-Mg alloy housing was produced successfully by permanent mold gravity casting.The practical production shows that the technology can be widely used to produce thin-walled parts or easily-hot crack alloy parts.关键词：Tilting Gravity Casting;Food Machinery;Permanent Mold;Semi-Permanent Mold
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发布时间：2023-12-18 - 摘要：Effects of different accumulated deformation rates and annealing temperatures on microstructure and mechanical properties of cold rolled Ti-3Al-2.5 V Ti alloy pipes were investigated to obtain a new preparing technology for preparing high strength and high ductility pipes.The results show that the recrystallization degree of Ti-3Al-2.5 V pipes exhibit relatively low with annealing temperature less than 550 ℃,while complete recrystallization can be observed in the pipes with annealing temperature of 700 ℃.The great variation of mechanical properties of the alloy pipes occurs at 550650 ℃ annealing treatment.With deformation rate of 51.1% and annealing at 550 ℃ for 90 min,or deformation rate of 68.5%80.2% and annealing at 600 ℃ for 90 min,tensile strength,yield strength and elongation of the Ti-3Al-2.5V alloy pipes are more than 862 MPa,724 MPa and 12%,respectively.关键词：Ti-3Al-2.5V Alloy;Deformation Rate;Recrystallization Annealing
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发布时间：2023-12-18 - 摘要：Effects of Bi addition on as-cast microstructure,mechanical properties of Mg-4Zn-Y alloys and corrosion behavior in 3.5% NaCl solution were investigated by X-ray diffraction（XRD）,optical microscope（OM）,mechanical property testing,weight loss measurement,electrochemical polarization curves and electrochemical impendence spectrum.The results show that the microstructure of Mg-4Zn-Y-xBi（x is 0,0.5,1,2） alloy consists of the matrix α-Mg phase,the ternary I（Mg3Zn6Y） and Y5Bi3 phase,and the morphology of I phase on the grain boundary is changed from semi-continuous net structure into dispersed particle ones.With the increase of Bi addition,Y5Bi3 phase is increased with the coarseness of grain size.The tensile strength,yield strength and elongation of the alloy at room and at high temperature are increased with the increase of Bi addition,however,they are deteriorated with excessive Bi content（2%）.Corrosion resistance of the alloy is decreased with Bi addition increase and the corrosion rate is the 23 times faster than Mg-4Zn-Y alloy.With 2% Bi addition,the corrosion current reaches the maximum value,0.913 mA,exhibiting the worst corrosion resistance.关键词：Mg-4Zn-Y;Bi;As-cast Microstructure;Corrosion Behavior
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发布时间：2023-12-18 - 摘要：Aging behavior and electric conductivity of the heat resistant Al-0.2Sc-0.04Zr（0.01B） alloy were investigated.The results show that the optimal aging condition of the heat resistant Al-0.2Sc-0.04Zr（0.01B） alloy is 330 ℃ for 189 min.Hot extrusion can greatly improve the elongation,however its effects on the maximum strength of the alloys can be ignored.The B addition can decrease the electric resistance of homogenized alloys at low temperature with the slight decrease of maximum strength aged at 300380 ℃.In all,the hot-extruded Al-0.2Sc-0.04Zr alloy exhibits the optimized mechanical properties and conductivity.The tensile strength reaches up to 160 MPa,and the electric conductivity at 20 ℃ is 63%IACS.关键词：Heat Resistant Al-0.2Sc-0.04Zr（0.01B） Alloy;Mechanical Properties;Electric Conductivity
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发布时间：2023-12-18 - 摘要：Commercial ZA27 alloy was treated by ultrasonic vibration treatment at 500 ℃.The results show that microstructure of ultrasonic treated ZA27 alloy is composed of uniform and fine equiaxed grain.With increasing in power,average grain size is decreased from 70μm to 40μm,and weight loss is decreased from 5.6 mg to 1.3 mg.Acoustic stream effects and cavitation effects can greatly refine the microstructure of ZA27 alloy,and make η+β phase to uniformly distribute along α grain boundary.Meanwhile,wear resistance of the ZA27 alloy can be improved obviously by power ultrasonic treatment.The optimized treating power is 1 500 W.关键词：Ultrasonics;ZA27 Alloy;Microstructure;Wear Resistance
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发布时间：2023-12-18 - 摘要：<正>董钦造鎏金铜佛坛（见下页）隋开皇四年（公元584）通高41cm,座长24.6cm,宽24cm青铜鎏金西安市出土西安博物院藏主尊阿尼陀佛结
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发布时间：2023-12-18
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