最新刊期
卷 38 ， 期 1 ， 2018
- 摘要：The SiCp/Ni35,Ni@SiCp/Ni35 and Cu@SiCp/Ni35 composite coatings on H13 steel were prepared by laser cladding.Three kinds of coatings were immersed in molten aluminum for 2 hat 700℃to measure the melting losses of samples.The microstructure and phase constituent of corroded coatings were observed by SEM and EDS.The corrosion mechanism of the coating in molten aluminum was described.The results show that the melting loss of H13 steel is 1623 times of that of three kinds of coatings,and the loss weight of the three coatings exhibits absence of apparent difference,which are attributed to the long nucleation time of new phase in Al/Ni contact diffusion couple and the low diffusion velocity of Al resulting in high anti-corrosion resistance of coating in molten aluminum.关键词：Laser Cladding;SiCp/Ni35;Corrosion
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发布时间：2023-12-18 - 摘要：The TC4 laser cladding layer was prepared on the surface of Ti811 alloys with coaxial powder feeding.The microstructure andβ-phase segregation of the coating were analyzed by using X-ray diffraction（XRD）,scanning electron microscope（SEM）and energy dispersive spectrometer（EDS）.The results reveal that,the typicalβ-phase segregation occurs in the cladding layer and appears as the large dark area.The microstructure of the non-β-phase segregation region of the cladding layer shows a typical widmanstatten structure.Many accicular martensiticα′-Ti and trace residualβ-Ti are distributed in the grain boundaries ofα-Ti,and nano particles ofα2 phase are dispersed in the cladding layer.In theβ-phase segregation region of the coating,a large area of residualβ-Ti appears in the microstructure while the grain boundaries ofα-Ti and accicular martensiticα′-Ti are obviously reduced,which are attributed to the molten pool formed by laser cladding cooling in a vary fast way and leaving no time for the phase transition of originalβgrains.关键词：Ti811;Laser Cladding;TC4;Microstructure;β-Phase Segregation
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发布时间：2023-12-18 - 摘要：The semi-solid slurry of Mg97Zn1Y2 alloy was prepared by ultrasonic vibration,and effects of rheo-squeeze pressure on microstructure and properties of Mg97Zn1Y2 alloy were investigated.The size ofα-Mg grains in the alloy obtained by ultrasonic treatment is decreased,and the LPSO structure can be refined and uniformly distributed in the matrix after ultrasonic treatment.After rheo-squeeze casting,the LPSO structure is further refined with appearance of strip phase on the block LPSO structure.With the increase of pressure,the number of strip phase is increased.The tensile strength and elongation of alloy are increased at first and then keep constant with the increase of pressure.The tensile strength and elongation of the alloy reach 234 MPa and 11.6%,respectively,with the pressure of 100 MPa.关键词：LPSO Structure;Semi-solid;Rheo-squeeze Casting;Mg97Zn1Y2 Alloy
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发布时间：2023-12-18 - 摘要：<正>近日,中国新能源汽车新锐——蔚来汽车在北京五棵松体育中心,举行其首款纯电动SUV ES8的全球首发仪式。据介绍ES8外观由宝马I系设计师操刀,产品定位为高性能7座纯电动SUV。该车一大亮点是车内所搭载的人工智能系统,该系统名
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发布时间：2023-12-18 - 摘要：<正>在2017年11月山东举行的第二届全国（东营）有色金属工业展上,金川集团镍钴研究设计院自主研发的铜电解始极片自动剥片机组受到行业关注。铜电解始极片自动剥
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发布时间：2023-12-18 - 摘要：<正>浙江万丰奥威汽轮股份有限公司（"万丰奥威"）发布投资议案,公司拟在浙江绍兴新昌高新技术产业园区投资建设铝合金轮毂智慧工厂项目。项目总投资5.34亿元,建设年产220万件铝合金轮毂生产基地。据了解,万丰奥威新昌铝轮毂项目,总建筑面积3.9万m2,新工厂将建设自动化智能生产线,主要包括生产厂房及厂区、市
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发布时间：2023-12-18 - 摘要：<正>为推动轻量化材料制造业创新中心建设工作,2017年12月12日,工业和信息化部原材料工业司在京组织召开了轻量化材料制造业创新中心建设工作座谈会,原材料工
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发布时间：2023-12-18 - 摘要：<正>2017年12月30日上午,随着生产车间内生箔机电源的启动,铜陵有色年产2万t高精度储能用超薄电子铜箔项目（一期）正式试生产。由此,进一步增强了铜陵经开区
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发布时间：2023-12-18 - 摘要：<正>11月19日,从上海期货交易所（以下简称"上期所"）获悉,上期所铜期货期权的立项申请已获得证监会批复。这是我国首个工业品期权品种,进一步丰富国内有色金属衍生品市场的风险管理工具。在分析人士看来,开发上市
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发布时间：2023-12-18 - 摘要：<正>安徽铜冠铜箔有限公司研发的超低轮廓电子铜箔产品荣获2017年"安徽省新产品"称号。铜冠铜箔公司研发的新产品超低轮廓电子铜箔,因其具有较低的表面粗糙度,能够很好地解决高频信号中的"集肤效应"对印制电路板信号
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发布时间：2023-12-18 - 摘要：<正>由重庆金世利钛业有限公司投资24亿元打造的航空钛合金研发制造基地,达产后产值约30亿元,主要研制和生产航空及燃气轮机用钛合金材料、锻件、其他金属材料,保障我国高端航空航天和燃气轮机用钛合金的供应,力争
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发布时间：2023-12-18 - 摘要：<正>日前,国家知识产权局发布《关于第十九届中国专利奖授奖的决定》,其中广东伊之密精密机械股份有限公司的"伺服控制半固态镁合金高速注射成型机"国家发明专利,获得第十九届中国专利优秀奖。此次获奖标志着国家知识产权局对该项目取得成
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发布时间：2023-12-18 - 摘要：<正>（一）上汽集团多种车型应用铝镁轻金属实现汽车轻量化上汽集团自荣威950车型发动机罩盖内外板在国内率先实现铝合金之后,君越、君威、GL8、迈瑞宝、新凯越、凯迪拉克CT6、
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发布时间：2023-12-18 - 摘要：<正>编组96个集装车箱的X9564次列车,满载2 400t进口铜精矿的集装箱班列从防城港站缓缓驶出,这是防城港首列发往云南桃花村站的铜精矿集装箱海铁联运班列,也
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发布时间：2023-12-18 - 摘要：<正>12月18日,中国有色金属加工工业协会评选出中国建筑铝型材二十强企业23家（含十强企业13家）、中国铜板带材十强企业10家（含五强企业5家）。中国铜板带材
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发布时间：2023-12-18 - 摘要：Effects of Sb on the hardness and impact properties of Mg2 Si/Al-Si composites fabricated by insitu reaction were analyzed.The results show that the hardness and impact properties of the composites are increased firstly and then decreased with the increase of Sb content.When the addition of Sb reaches up to 0.4%,the composites have a maximum hardness of 91 HB,improved by about 27.3%than that of un-modified composites.In addition,the impact toughness,yield energy,failure energy and maximum energy also reach to the maximum,value of 11.4 J/cm2,0.24 J,11.62 Jand 2.79 J,respectively.The composites with 0.4% Sb modified exhibit a good impact properties,which are attributed to the increase of crack propagation path and time to increase the crack propagation resistance accordingly as a result of the smaller size and unifrom distribution of primary Mg2 Si particles.关键词：Mg2Si/Al-Si Composite;Sb Element;Hardness;Impact Property
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发布时间：2023-12-18 - 摘要：80 slices images of each of the two areas of AZ91 Dmagnesium alloy were obtained by continuous sectioning technique,and then the images were treated including cleaned,rotated and aligned,at last,the finished images were reconstructed to 3 Dstructures using Image J and Mimics,respectively,to understand their structure feature.It can be seen from the reconstructed three-dimensional structure of AZ91 D magnesium alloy that the primary phaseα-Mg occupies a larger volume,and other phase content is relatively low.The measurement results are consistent with the experimental ones.关键词：Magnesium Alloy;Primary Phaseα-Mg;Microstructure;Three-Dimensional Reconstruction
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发布时间：2023-12-18 - 摘要：The solution treatment,aging and cold rolling were carried out the extruded Mg-11 Li-3 Al-xZr（x=0,0.1,mass fractim,%）alloys,and the microstructures and properties of the alloy before and after rolling were analyzed by OM,XRD and testing machine.The results show that the solution and aged Mg-11 Li-3 Al-xZr alloy is mainly composed ofβ-Li and a little granular compound,andα-Mg,θ-MgLi2 Al and AlLi phase can be precipitated during the rolling process,and then theθ-MgLi2 Al phase is gradually transformed into AlLi phase.With the increase of the rolling deformation rate,the grain size in the alloy is increased.The strength and elongation of the Mg-11 Li-3 Al-xZr alloy are increased at first and then decreased.Under proper deformation,both the strength and plasticity of the alloy can be improved because of the combination effects of solution strengthening,work hardening and the decomposition of strengthening phase and grain coarsening.Mg-11 Li-3 Al alloy has the best comprehensive performance at60% cold deformation,where tensile strength and elongcotion reach 242 MPa and 46%.respectively,while Mg-11 Li-3 Al-0.1 Zr alloy has the best comprehensive performance at 40% deformation,where tensile strength and elongation reach 255 MPa and 24%,respectively.关键词：Mg-Li Alloy;Solid Solution and Aging;Cold Rolling;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：The service effect of the quartz crucible commonly used for platinum jewelry casting was analyzed with ICP-AES,XRF,thermal dilatometer,stereomicroscope,SEM and XRD.The results indicate that the quartz crucible has good thermal shocking resistance,however,its heat resistance is low,so under the high temperature effect of the molten platinum alloy,the crucible inner wall presents as the fused state with amounts of bubbles,thus it is inevitable that part of fused quartz and bubbles are drawn into the mold cavity during pouring.After pouring,the fused quartz in the inner wall of the crucible is formed into translucent glass layer with an obvious bubble band and some metal beads embedded,while there exists a little of cristobalite transformation in the outside wall,and the crucible volume will enlarge continuously with the increase of melting times,increasing the cracking tendency.关键词：Platinum;Jewelry;Casting;Quartz Crucible
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发布时间：2023-12-18 - 摘要：The isothermal constant strain rate compression tests were carried out to understand the high temperature deformation rheological behavior and microstructure of GCr15,and the flow stress equation and dynamic recrystallization equation of GCr15 was established.Influences of different hot forging condition on microstructure and forming quality of GCr15 bearing ferrule were analyzed based on DEFORM-3 Dsoftware.The simulated results show that the internal microstructure of the forging bearing ring ferrule is recrystallized under a certain deformation conditions,so that the average grain size is decreased with the increase of the deformation rate,and increased with the increase of the deformation temperature,while it is decreased with the increase of the deformation speed.The damage value of the ring surface is increased with the increase of the friction factor.Through increasing the preheating temperature of the mold,the punch force can be reduced,however,it has some influence on the dynamic recrystallization of the outer surface of the bearing ring.关键词：GCr15;Bearing Ring;Microstructure;Dynamic Recrystallization
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发布时间：2023-12-18 - 摘要：Based on the Euler-Euler method,the mathematical model of complex physical processes such as dispersed phase nucleation,diffusion growth,Ostwald ripening,Marangoni migration,was established,and dispersed phase droplets conservation equation and the density of the two phases based on solute transport equation was described.The results reveal that compared with Al-10 Pb monotectic alloy,the microstructure distribution of Al-5 Pb monotectic alloy exhibits more uniform,and the average diameter of the dispersed phase is the smaller and volume fraction distribution is more uniform.The decrease of the dispersed phase content leads to the decrease of the liquid-liquid phase separation and decomposition rate in immiscible alloy,and it is easier to obtain a solidified structure in which the dispersed phase is distributed uniformly.关键词：Monotectic Alloy;Dispersed Phase;Solidification Process;Numerical Simulation
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发布时间：2023-12-18 - 摘要：Grid method（projection method）and meshless method（smoothed particle hydrodynamics method）were adopted to simulate filling process of the magnesium alloy plate.The simulated results were compared with that of Win-Cast.Effectiveness of the two methods was verified.Because the SPH method can obtain the entire physical system characteristics by tracking the motion of the particle,it is not require special methods to track the free surface,showing some advantages in the mathematical model.关键词：Projection Method;Smoothed Particle Hydrodynamics;Filling Process;Simulation
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发布时间：2023-12-18 - 摘要：Some experiments for counter-pressure casting A356 aluminum alloy steering knuckle were carried out including fatigue performance test,fatigue fracture scanning,XRF experiment,metallographic observation and statistics of inclusions,electrolytic extraction inclusions,XRD and EDS analysis.The results show that inclusions in the steering knuckle are mainly the oxidized inclusions with a small amount of nitrides,carbides and metal impurities.In addition,the inclusions in the upper part are more than those in the lower part,and the inclusions such as Al2 O3 and SiO2 in right side steering knuckle are slightly higher than those of the left ones.关键词：A356Aluminum Alloys;Inclusions;Electrolytic Extraction;Fracture Analysis
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发布时间：2023-12-18 - 摘要：According to its structure,the die casting process of aluminum alloy heat sink was designed,and then simulated by Flow-3 Dsoftware.The results reveal that gas-entrapped defects can be observed in its four edges of part bottom.Crack detection and sectioning observation on the test-piece of the trialproduction show that the simulated results are well consistent with practical observation,where many blowholes and pinholes can be observed in the edge parts.Process optimization was carried out to adjust the size of ingate.Its results show that the defects can be eliminated effectively.Based on the optimized process,the samples were produced.The results are well in agreement with the simulated ones,where blowholes and pinholes are eliminated greatly,meeting application requirements and reducing the defective rate.关键词：Heat Sink;Die Casting;Numerical Simulation;Process Optimization
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发布时间：2023-12-18 - 摘要：The popular casting machine in the market belongs to four-beam type low pressure casting machine with small space for operation,so that it is very inconvenient for the sand core-setting,workpiecepushing and mold cleaning.For this reason,the cantilever low pressure casting machine was designed.The cantilever casting machine can unload the workpiece and install the sand core simultaneously,and eliminate the auxiliary device.Although the cantilever structure has many advantages,however,its stability is poor,and it is easy to be deformed.After calculation,the maximum force acting on the upper template was obtained.The proper dimensions of the cantilever and beam was designed according to the calculated data.Finally,the static analysis of the cantilever and the beam was carried out to ensure its theoretical feasibility.关键词：Low Pressure Casting Machine;Cantilever;Stress Calculation;Finite Element
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发布时间：2023-12-18 - 摘要：By proportional solidification,process of investment casting stainless steel three-pass castings was designed.Meanwhile,simulation analysis for the process was carried out by the numerical software.The relationship between riser deviation factor S and modulus ratio k was presented.Design of the process of casting M03552 was performed based on the relationship.The simulated results reveal that the shrinkage porosities（holes）in the three-pass castings can be eliminated,and the yield production rate is increased.关键词：Proportional Solidification Technology;Investment Casting;Three-pass Castings;Simulation
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发布时间：2023-12-18 - 摘要：With reinforced material of carbon fiber modified by different modifier,SLS coated sand specimens were prepared.The effects of carbon fiber modification and content on tensile strength and bending strength of the samples were analyzed by mechanical test and scanning electron microscopy（SEM）.The results indicate that the modified carbon fibers treated by nitric acid and silane coupling agent（KH550）present the desirable reinforcement effect on SLS coated sand mold,and the strength of SLS coated sand mold is increased firstly and then decreased with the increase of carbon fiber content.When the carbon fiber content is 3%,the curing tensile strength and bending strength of the SLS coated sand mold reach maximum value of 6.385 MPa and 8.011 MPa,increased by 46.18%and 33.92%respectively,compared with those of one added unmodified carbon fibers,and increased by 23.18% and 31.46%,respectively,compared with those of ones with absence of carbon fibers.关键词：Carbon Fiber;Modification;SLS Coated Sand Mold;Tensile Strength;Bending Strength
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发布时间：2023-12-18 - 摘要：The Ti43Zr27Mo5Cu10Be15 amorphous composites were fabricated by using arc melting and copper mold suction casting.Wear and friction characteristics of Ti43Zr27Mo5Cu10Be15 amorphous composite alloy under dry sliding conditions were investigated with the pin-on-disc tribotester.The composition was examined by X-ray diffraction.The worn surface morphologies of the samples were observed by a scanning electron microscope.The results show that load and sliding speed affect significantly the wear characteristics of Ti43Zr27Mo5Cu10Be15 amorphous composites.With the increase of speed and load,the fluctuation amplitude of friction coefficient is decreased,then the friction coefficient is low and stable in0.219 00.367 5.In addition,wear volume reaches 2.031.9 mg.The wear mechanism is characterized from abrasive wear into adhesive wear accompanied with plastic deformation.关键词：Amorphous Composites;Wear Morphology;Wear Mechanism
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发布时间：2023-12-18 - 摘要：Zr0.48Cu0.36Al0.08Ag0.08)100-xNbx（x=0,1,2,4）（in atom,%）bulk metallic glasses（BMGs）with diameters of 3mm were prepared by a copper-mold suction casting method.Phase composition and mechanical properties of the BMGs were investigated by X-ray diffraction（XRD）,electro-scanning microscope（SEM）,mechanical property testing machine.The results show that with the increase of Nb content,the glass forming ability of amorphous alloy is decreased gradually.The specimens are changed from completely amorphous structure to composite structure of amorphous matrix with crystalline phase.Besides,the plasticity of the specimens is increased firstly and then decreased.When xis 2,the ductility of the specimens reaches the maximum of 1.025%with work-hardening phenomenon.The maximum fracture strength reaches 1.723GPa with the apparent work-hardening when xis 4.The addition of Nb is beneficial to the improvement of the plasticity of Zr48Cu36Al8Ag8BMGs.关键词：Bulk Metallic Glasses;Element Addition;Plasticity;B2-CuZr Phase
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发布时间：2023-12-18 - 摘要：The Cr-33.3 Ta and Cr-26.6 Ta-20 Ti alloys were fabricated by mechanical alloying and hotpressing sintering process.The influences of Ti addition on the microstructure and fracture toughness of TaCr2 alloys containing Laves phase were investigated.The results indicate that the alloying element Ti preferentially occupies the Ta site in the Laves phase TaCr2.Intermetallic compounds can’t be synthesized by the blended Ta,Cr and Ti powders during the ball-milling for 25 h.The highly dense alloys were prepared from the ball-milled blended powders by the hot-pressing process at 1 350 ℃for 1 hThe Cr-33.3 Ta alloy with an addition of 20%的 Ti（in atom）can inhibit the generation of Laves phase TaCr2 with a C14 structure.Compared to the unalloyed Cr-33.3 Ta alloy,the fracture toughness value of the Cr-26.6 Ta-20 Ti alloy is increased from 2.013 MPa·m1/2 to 4.066 MPa·m1/2,exhibiting desirable alloying toughening effect.Meanwhile,the Vicker’s hardness is also increased up to 11.59 GPa.关键词：Mechanical Alloying;Laves Phase TaCr2;Microstructure;Fracture Toughness
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发布时间：2023-12-18 - 摘要：Pin-on-disc wear experiments were carried out to analyze influence of loads on wear properties of tin bronze surface with drilled dimple texture.The friction coefficients and wear weight loss were measured.The worn surface morphologies of the alloy were observed with 3 Ddigital microscope.Drilled dimple textured specimens were compared with non-textured specimens.Experimental results reveal that the wear debris trapping function and edge hardening of dimples can improve the wear properties of tin bronze specimen surface under lower load conditions.However,the wear properties of tin bronze specimen surface can be decreased under higher load conditions,which are attributed to crack and peeling of dimple edge,high stresses of dimple edge and micro-cutting effect of coupled ball.关键词：Copper Alloy;Texture;Wear
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发布时间：2023-12-18 - 摘要：The influences of different ultrasonic power（0900 W）and treating time（090 s）on the solidified structure and mechanical properties of ZA27 alloy were investigated.The results indicate that with the increase of ultrasonic power or treating time,the primary phase in the alloy is refined at first and then coarsened at 520℃,and primary phase exhibits desirable with 700 Wfor 30 s.When the ultrasonic power is 700 W for 30 s,the alloy presents the satisfied comprehensive mechanical properties,where the tensile strength and elongation reach 435.16 MPa and 6.11%.By observing fracture morphology of alloy,it is found that after ultrasonic melt-treatment,the tensile fracture of ZA27 alloy is characterized by brittle fracture in combination with toughness fracture,and many tearing slits and dimples can be observed at the fracture surface.关键词：ZA27Alloy;Ultrasonic Melt-treatment;Solidification Structure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：By using the orthogonal test,the error pitch test was carried out in the Simufact software.The internal diameter tolerance and the outer surface roundness error of the connecting rod liner were simulated.Through the grey correlation coefficient and grey relational degree,the multi-objective parameter optimization was carried out,and the parameter combination of the optimal error pitch and the influence degree of each factor on the evaluation index were presented.Results show that the order of influencing the connecting rod bushing size precision is followed as:feed ratio>first round pressure ratio> axial offset,and the forming quality of the lining sleeve for the connecting rod is obviously improve by using the optimized the offset spinning parameters.关键词：Stagger Spinning;Connecting Rod Bushing;Grey Relational Degree;Dimensional Accuracy
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发布时间：2023-12-18 - 摘要：The forgeability of copper and copper alloys were analyzed by hot die forging experiments.The current evaluation method of copper alloy’s forgeability was summarized,and a more reliable evaluation standard of copper alloys’ forgeability was proposed.On the basis of the high temperature tensile test of three kinds of copper alloy,the forging behavior of Cu alloy was analyzed,and a new and more reliable evaluation system of the logarithmic copper alloy was proposed.The results reveal that the forging temperature range of different copper alloys can be obtained by using die forging to analyze the cracking conditions at different temperatures,and the relative ductility of different Cu alloys can be presented by comparing deformation of the copper alloys at the optimum forging temperature.The results were compared with the existing conclusions,and the accuracy and advantages of the evaluation method proposed for the forging behavior of the copper alloy were verified by the hot die forging.关键词：Copper Alloys;Forgeability;T-shape Mold;Hot Die Forging;High-temperature Tensile
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发布时间：2023-12-18 - 摘要：The effects of Zr contents on microstructure refinement and mechanical properties of as-cast Mg-6 Zn-xZr alloy were investigated.The results reveal that with the increase of Zr content,grain size and the secondary dendrite spacing are decreased significantly,so the hardness and strength of the alloy are improved.The matching plane and direction between Zr and ZnZr withα-Mg system were analyzed by edge-to-edge matching model,and degree of the mismatch was calculated.The results reveal that the Zr andα-Mg have five groups of plane and direction matching pairs,and ZnZr andα-Mg also exist[11 2-0]Mg/[100]ZnZr‖（0002）Mg/（001）ZnZrmatching pairs,thus Zr and ZnZr can be used as a heterogeneous nucleation substrate to promote nucleation and lead to grain refinement.关键词：Mg-Zn Alloy;Zr;Grain Refinement Mechanism;Edge-to-Edge Matching Model
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发布时间：2023-12-18 - 摘要：Effects of the argon arc welding repairing on the properties of ZL114 Aalloy sand castings were investigated by tensile testing and fatigue testing.The results reveal that the argon arc welding repairing has the ingored effect on properties of the ZL114 Aalloy sand castings,where the tensile strength and yield strength are decreased by about 5% and the elongation is decreased by about 15%.The high temperature of welding process can result in Mg element burn-loss,so the strengthening phase Mg2 Si in the ZL114 Aalloy is reduced,leading to the decrease of properties of the welding zone.The difference of hole and pore geometry and number between the weld zone and un-welded zone can be observed,so fatigue life of full-welded specimen is lower than that of half-welded and un-welded ones at high stress condition,while fatigue life of half-welded specimens is higher greatly than that of un-welded and full-welded ones.关键词：ZL114ASand Castings;Argon Arc Welding Repair;Tensile Properties;Fatigue Properties
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发布时间：2023-12-18 - 摘要：A new method to prepare Al-Ti-C master alloy was proposed.Arc temperature can make graphite and aluminum better mix together,which can resolve the problems of poor wettability between graphite and aluminum.By using scanning electron microscopy（SEM）,X ray diffraction（XRD）,energy spectrum analysis（EDS）,Al-Ti-C master alloy prepared was analyzed.It can be seen that Al-Ti-C master alloy prepared by high temperature arc in pure molten aluminum is composed of Al,TiAl3 and TiC.The Al-Ti-C master alloy with desirable effects was prepared by reaction of carbon and titanium with aluminum under current of 75 Aand molten aluminum temperature of 800 ℃.关键词：Arc Temperature;Al-Ti-C;AlTi3;TiC
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发布时间：2023-12-18 - 摘要：A method for the quantitative analysis of Al-Ti-B microstructure of master alloy was proposed,which was based on Image J’s quantitative description of the particle size,shape and uniformity of TiAl3 phase in master alloy to realize the quantitative evaluation for structure and morphology.The morphology of the TiAl3 phase was plotted and its particle size was obtained based on the software Image J.Through ratio of the area of the TiAl3 phase to the area of the "envelope pattern",shape of the TiAl3 phase was evaluated quantitatively.At the same time,a describing method for uniformity of particles was presented,and distribution of the distance between the particle and its corresponding node was drawn based on the Matlab.Finally,based on the SPSS,the quantitative analysis of the particle size,shape and uniformity of the TiAl3 phase obtained by the above method was carried out with thermal conductivity of the mold.关键词：Al-Ti-B;Quantitative Analysis;Envelope Pattern;Uniformity;Correlation
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发布时间：2023-12-18 - 摘要：The influence of ultrasonic vibration treatment（UVT）on the Fe-enriched phases and mechanical properties of Al-14Si-xFe-yMn（x=1,2,3,4,y/x=0.2）alloys were investigated.The results show that the long-needle-likeβ-Al5FeSi phase can be generated in the Al-14Si-1Fe-0.2Mn alloy without UVT.When the iron content in the alloy is equal or greater than 2%,both of the long-needle likeβ-Al5FeSi phase and coarse plate-likeδ-Al4FeSi2phase appear.The coarseβ-Al5FeSi andδ-Al4FeSi2phase can be refined to a certain extent after UVT.In addition,the formation of irregular polygonalα-Al15（Fe,Mn）3Si2phase is also promoted.Ostwald ripening of theα-Al15（Fe,Mn）3Si2phase takes place during the solidification process after UVT.Some grains ofα-Al15（Fe,Mn）3Si2phase are close to spherical particles when the iron content is increased.The room temperature tensile strength of the alloy with UVT is improved significantly compared to that without UVT.The tensile strength at 350℃is also improved slightly.关键词：Ultrasonic Vibration Treatment;Al-14Si-xFe-yMn Alloy;Fe-enriched Phases;Mechanical Properties
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发布时间：2023-12-18 - 摘要：The microstructure and grain refining performance of Al-5 Ti-1 Bgrain refiners prepared by different ultrasonic treatment were described by using X-ray diffraction（XRD）,optical microscopy（OM）and scanning electron microscopy（SEM）.Meanwhile,refining effects of pure aluminum was observed with the Al-5 Ti-1 B master alloy.The results show that the ultrasonic vibration applied in fabrication of Al-5 Ti-1 Bgrain refiner can improve greatly the microstructure and grain refinement performance of the grain refiner.With continuous ultrasonic treatments for 10 minutes,the morphology of TiAl3 exhibits small block-like with average size of 12.4μm and the TiB2 particles are distributed dispersedly in the Almatrix.The grain in pure aluminum refined by the Al-5 Ti-1 B master alloy is about 307μm,exhibiting the desirable refining effects.关键词：Ultrasonic Vibration;Al-5Ti-1BGrain Refiner;Refining Performance
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发布时间：2023-12-18 - 摘要：The contents of favorable phases likeαc-AlFeSi andβР-AlFeSi are increased by increasing the element Si content in 1235 aluminum alloy,and tensile strength of the alloy is improved simultaneously.By analysis of the second phases and properties,the optimal annealing process of high silicon 1235 aluminum（Si content by 13%14%）is 530℃×4 hwith natural cooling.Theαc-AlFeSi phase in 1235 aluminum alloy is optimized with slight increase of size and short-rod structure.The tensile strength is declined by 6.05% compared to that of low silicon content.Compared to the end product of low silicon1235 aluminum,the tensile strength and elongation of that with high silicon are improved by 7.55%and84.15%,respectively.关键词：High-Silicon 1235Aluminum Foil Stock;Annealing;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：<正>俄联邦研究中心"俄科院西伯利亚分院克拉斯诺亚尔斯克科学中心"下属的基连斯基物理所与西伯利亚联邦大学和国家研究型技术大学"莫斯科钢铁合金学院"的科学家提出,使用石墨烯与单层二硫化钒薄膜的化合物作为锂离子电池的阳极材料,将
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发布时间：2023-12-18
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