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  • 2010 Volume 0 Issue 7
    Published: 20 July 2010
      

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  • YANG Jiao, MO Ji-Liang, C. VERRIER, ZHENG Jian-feng, LIAO Zheng-jun, ZHU Min-hao
    2010, 0(7): 1-5.
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    YANG Jiao, MO Ji-Liang, C. VERRIER, ZHENG Jian-feng, LIAO Zheng-jun, ZHU Min-hao. Study on Rotational Fretting Tribology Behavior of PMMA[J]. Journal of Materials Engineering, 2010, 0(7): 1-5.

    Rotational fretting tests of polymethylmethacrylate(PMMA)flat against GCr15 steel ball(with diameter of 40mm)were performed on a new rotational fretting tester,with different angular displacement amplitudes from 0.25° to 2.5° and a normal load of 100N.Based on the study of the frictional kinetics of rotational fretting and the micro-analysis of the wear scar,the damage characteristics of PMMA were discussed in detail.The results indicated that three fretting running regimes were presented during the rotational fretting of the PMMA with the increase of the angular displacement amplitude,i.e.partial slip regime,mixed fretting regime and gross slip regime.To compare with the partial slip regime with the gross slip regimes,the friction coefficient of the mixed fretting regime was much higher.In the partial slip regime,a lower level of friction coefficient was held and slight damage was appeared,while the fretting motion was accommodated by elastic deformation.In the case of both mixed fretting and gross slip regimes,particles detached by delamination and abrasive wear accompanying with viscous flow were the main rotational fretting wear mechanisms.The research found that an upheaval was formed induced by damage accumulation of viscous flow at the center of wear scar in the mixed fretting and gross slip regimes.
  • DONG Gui-lin, YU Ping, LI Bing, ZHOU Ning-ning, CHEN Xiang-jun, QIN Zhan-bo, ZHANG Chang-qiao
    2010, 0(7): 6-13.
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    DONG Gui-lin, YU Ping, LI Bing, ZHOU Ning-ning, CHEN Xiang-jun, QIN Zhan-bo, ZHANG Chang-qiao. Research on Preparation of Coated Poly-α-olefin Microencapsulation Based on Polyurethane[J]. Journal of Materials Engineering, 2010, 0(7): 6-13.

    With polyurethane as wall material,the preparation technology and process of microcapsule coating were studied on the surface of poly-α-olefin viscoelastic polymer particles.Molecular dynamics simulation methods were used to discuss the relevant molecular designs,and stable performance polyurethane microcapsules were produced by the method of interfacial polymerization,with toluene 2,4-diisocyanate(TDI)and glycerol as active monomers.The influence on coating in monomer type,ratio,particle size and amount of wall material were researched,The surface morphology,oil solubility,heat and pressure resistance of poly-α-olefin microcapsules were tested.The influences of drag reduction effect by the indoor simulative loop evaluation system for oil drag reduction agent were evaluated.The results show that the length and number of branched chains had specific requirements in the design of coated wall material molecular.The reasonable process conditions of polyurethane-coated poly-α-olefin microcapsules were as follows:the system was aqueous solution,the molar ratio of isocyanate group(-NCO)and hydroxyl(-OH)was 1:1,the mesh number of poly-α-olefin particle size was 60-80(250-180μm),the weight of wall material accounted for 0.5% of poly-α-olefin particles,the weight of surfactant accounted for 0.1% of poly-α-olefin particles,the temperature was 25℃ under atmospheric pressure.The producing poly-α-olefin microcapsule had good surface morphology,faster release speed,no effect on the original drag reduction,excellent heat and pressure resistance.Moreover,poly-α-olefin microcapsules which were stored in powder-like solid at room temperature can be made into oil drag reduction agent easily at the time of on-site using by being dispersed into the solvent directly and solved the technical problem of dispersion in industrial applications.
  • YAN Xia, LONG Sheng-ru, YANG Jie
    2010, 0(7): 14-17.
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    YAN Xia, LONG Sheng-ru, YANG Jie. Effect of Stretching Rate on Micromechanics of CF/PA6 Micro-composite[J]. Journal of Materials Engineering, 2010, 0(7): 14-17.

    Micromechanical performance of carbon fibre reinforced PA6 resin micro-composite was studied by the microbond test which has been well accepted as the most important micromechanical test for evaluating the interfacial properties between the fibre and matrix.The effect of different stretching rate on the interfacial properties was investigated.The results showed that the maximum force(Fmax)demonstrated good linear relationship with embedded length(le)with the stretching rate 3.5,4,4.5mm/min when le was less than 140μm,and the carbon fibre was broken without matrix debonding when the stretching rate was 5mm/min in the case of le bigger than 70μm.
  • LA Pei-qing, Lü Rui-jiao, WANG Li
    2010, 0(7): 18-23.
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    LA Pei-qing, Lü Rui-jiao, WANG Li. Effect of Technical Parameters on Nanostructure and Mechanical Properties of the Bulk Nanocrystalline Fe3Al[J]. Journal of Materials Engineering, 2010, 0(7): 18-23.

    Bulk nanocrystalline Fe3Al materials were prepared by aluminothermic reaction at different igniter quantities,milling time,and molding pressure.The grain size was studied by means of XRD.Compressive strength and hardness of the materials were tested.The results showed that with igniter quantity increasing,the average grain size of materials reduced slightly,and then increased,while the yield strength increased slightly and then decreased;the hardness gradually decreased.The effect of milling time on nanostructure and mechanical properties of the bulk nanocrystalline Fe3Al materials is not remarkable.With the powder pressing increasing,the average grain size of materials is stable,yield strength and hardness of materials increased.
  • ZHANG Ding-fei, LIU Jie-hui, HU Hong-jun, SHI Guo-liang, DAI Qing-wei
    2010, 0(7): 24-28.
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    ZHANG Ding-fei, LIU Jie-hui, HU Hong-jun, SHI Guo-liang, DAI Qing-wei. Microstructure and Texture Evolution of AZ31 Magnesium Alloy Processed by Extrusion-shear Technique[J]. Journal of Materials Engineering, 2010, 0(7): 24-28.

    Microstructure and texture evolution of AZ31 magnesium wrought alloy processed by a new severe plastic deformation including extrusion and shear were investigated.The results showed that fine and uniform microstructures can be achieved by extrusion-shear technique and variety types of texture can also be found in microstructures,which weakened the the dominant of base texture.In addition,the {0002} basal texture intensity reduced after ES technique,which can be observed in the pole figures and the recrystallization mechanism of ES Technology is continuous dynamic recrystallization.
  • CHENG Jian-yi, AO Xue-wen, YU Fang-xin, TAN Dun-qiang
    2010, 0(7): 29-33.
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    CHENG Jian-yi, AO Xue-wen, YU Fang-xin, TAN Dun-qiang. Effect of Internal Oxidation Process Parameters of Cu-Al Alloy on Its Properties[J]. Journal of Materials Engineering, 2010, 0(7): 29-33.

    The internal oxidation process and kinetics of Cu-0.3Al alloy powders was studied.The results showed that the electrical conductivity and hardness of Cu-A12O3 alloy increased obviously in the initial stage(about 15 minutes)at different temperature of internal oxidation and increased slightly with the proceeding of internal oxidation.The hardness decreased slightly in the later stage.The time needed by reaching the hardness peak was shortened with the increase of internal oxidation temperature.Hardness and conductivity reached the highest value HV130 and 84.6%IACS respectively under the conditions of 900℃×1h internal oxidation.The temperature had significant influence on the nucleation and growth of A12O3 particles.The size of A12O3 particles increased and a small part of γ-A12O3 particles transformed to the coarse α phase with the increase of temperature and proceeding of internal oxidation.
  • JIANG Hai, LI Dong-sheng, WU Feng-qiu
    2010, 0(7): 34-37,41.
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    JIANG Hai, LI Dong-sheng, WU Feng-qiu. Manufacture of C/C Composites Aircraft Brake Disc by Atmosphere Chemical Vapor Deposition Process[J]. Journal of Materials Engineering, 2010, 0(7): 34-37,41.

    Normal chemical vapor deposition(CVD)process all be carried out in vacuum state(V-CVD).The process of atmosphere chemical vapor deposition process(A-CVD)is carried out in a pressure of exceeding atmospheric pressure.The equipment of A-CVD process needed is more cheaper and ease to maintenance compare to the V-CVD process.The dynamometer testing results of random fiber preform C/C composite brake discs,densified by A-CVD process,showed that the average friction coefficient reached 0.417(results of 50 stops)and the coefficient among the testing was steady including after leave it at room temperature condition 24 hours.
  • CAI Xiang, YAN Wen-yan, XIE A-gui, WU Ting, TAN Shao-zao
    2010, 0(7): 38-41.
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    CAI Xiang, YAN Wen-yan, XIE A-gui, WU Ting, TAN Shao-zao. Preparation and Antibacterial Property of Modified Vermiculite with Quaternary Phosphonium Cations[J]. Journal of Materials Engineering, 2010, 0(7): 38-41.

    Modified vermiculites(D-V)were prepared by introducing different content of quaternary phosphonium cation of Dodecyl tributyl phosphonium bromide(D)into sodium vermiculite(Na-V)through ion-exchange method,and the structure and antibacterial properties were characterizated.The results of TGA show that the onset temperatures of the decomposition for D in the D-V are all higher than 240℃,indicating preferable thermal stability.The XRD patterns display that the interlayer spacings of the D-V increases with the increase of the content of D.The SEM images show that Na-V displays flake shape with the particles adhered and interwinded each other,and the particles of the D-V are formed of irregular shapes.The antibacterial activity of the D-V increases with the increase of the content of D,and D-V containing 19.7% of D shows good antibacterial activity with the Minimal Inhibitory Concentrations against E.coli and S.aureus of 720mg·L-1 and 100mg·L-1,respectively.
  • MA Feng, LI Yong-chao, CHEN Ming-hui, ZONG Xue-gang
    2010, 0(7): 42-45,77.
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    MA Feng, LI Yong-chao, CHEN Ming-hui, ZONG Xue-gang. Preparation of Melamine Resin/Butyl Stearate Microencapsulated Phase Change Materials[J]. Journal of Materials Engineering, 2010, 0(7): 42-45,77.

    Microencapsulated phase change materials(MPCMs)were prepared by means of in-situ polymerization,with melamine resin as the shell and butyl stearate as the core.The structure,morphology,and thermal performance of the products were characterized by IR,ESEM and DSC,and the effects of the emulsifier sort and the dropping rate of prepolymer on the morphology of the microcapsules were investigated.As a result,the average diameter of the microcapsule is less than 10μm,and the particle size is centralized when the dropping rate of the prepolymer is in the range of 0.8mL/min-1.2mL/min,and the mass ratio of composite emulsifier TA to span-80 is 5:1.Phase change latent heat of the microcapsule is 68.36J/g.The microcapsule has a small mass loss undergoing continuous phase change,and its heat transmit is obvious.
  • DAI Ya-chun, WANG Yun, ZHOU Jian-zhong, CHEN Wei, DONG Fang
    2010, 0(7): 46-48,53.
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    DAI Ya-chun, WANG Yun, ZHOU Jian-zhong, CHEN Wei, DONG Fang. Injection Molding Micro-gear Orthogonal Optimization and Numerical Simulation[J]. Journal of Materials Engineering, 2010, 0(7): 46-48,53.

    Micro-injection molding was employed in the micro polymer gears.The forming processes of different injection materials such as Abs,polypropylene(PP),polycarbonate(PC)were compared.The main process parameters influencing the micro-parts quality included injection pressure,mold temperature,injection temperature and filling time.Combined the numerical simulation with orthogonal optimization method,the injection forming was optimized to obtain the optimal process parameters,which was useful for the structure design of micro-gear die and process parameters.The simulation results showed that filling time could be shortened with the increase of molding temperature,injection pressure and injection temperature.It also showed that the availability of polymer material on the gear micro-injection was as follows:Abs>PP>PC.
  • ZHANG Ji-kui, CHENG Xiao-quan, LI Zheng-neng
    2010, 0(7): 49-53.
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    ZHANG Ji-kui, CHENG Xiao-quan, LI Zheng-neng. Synthetic Characterization and Evaluation of Mechanical Properties for Airframe Metal Based on Damage Tolerance Design[J]. Journal of Materials Engineering, 2010, 0(7): 49-53.

    The airframe material selection criterion has paid more attention to the damage-tolerant properties with the establishment of durability and damage-tolerance design principle.Considering the actual bearing stress,the damage-tolerance properties can be characterized by the da/dN-3ΔKb curves during crack stationary propagation stage.The damage tolerance properties of the airframe metals are compared by using this method.The compared results show that this characterization could characterize the damage-tolerance properties of materials more comprehensively.The curves of stress vs.total fatigue life and crack propagation are plotted to evaluate the synthetic mechanical properties,and to enhance the accuracy of materials selection.On the other hand,the relationship between material properties and design requirements are established through these curves,this could guide the new material research and development.
  • CHEN Wei, XUE Lei, CHEN Kang-min, CHENG Shan
    2010, 0(7): 54-58.
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    CHEN Wei, XUE Lei, CHEN Kang-min, CHENG Shan. Warm Tensile Properties and Microstructures of Dual Phase Steel Laser Tailor Welded Blanks[J]. Journal of Materials Engineering, 2010, 0(7): 54-58.

    The tensile properties and microstructures of dual phase steel laser tailor welded blanks(DP-LTWBS)have been investigated.The correlation of temperatures,tensile properties and microstructures has also been studied systematically.The results showed that true stress-strain curves dropped down,the tensile strength decreased and the elongation increased with the increasing temperatures.During the warm tension the cracks initiated from the weld and the microstructures changed markedly.The arborescent structure died out with the increasing temperatures,and finally lath martensite has been transformed into fine equiaxed ferrite.The tensile fracture types of the weld were dimple under different temperatures.The size and depth of dimple increased with the increasing temperature.
  • LI Jin-quan, HUANG De-wu, WANG Min-jie
    2010, 0(7): 59-63.
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    LI Jin-quan, HUANG De-wu, WANG Min-jie. Effect of Valence Electron Structures of Different Targets on Deformations of Tungsten Alloy Penetrators[J]. Journal of Materials Engineering, 2010, 0(7): 59-63.

    45steel targets and 30CrMnMo steel targets were penetrated respectively to analyze different microstructure characteristic of residual projectiles by launching small diameter 93W projectiles.It is shown that deformations of residual projectiles are related to performance of targets.The valence electron structures of the two kinds of targets are analyzed according to the EET(the Empirical Electron Theory of solids and molecules).There is small force on penetrators after penetrating 45 steel targets because of weak C-Fe bond,so grains on the heads of residual projectiles were broken up and the heads of residual projectiles that are just like "mushroom head" were not destroyed by adiabatic shear.Powerful force was exerted on residual projectiles after penetrating 30CrMnMo steel targets because of strong C-Mo bond,so the heads of 93W residual projectiles were destroyed by adiabatic shear and had "self-sharpening" effect.
  • SHA Gui-ying, LIU Cui-yun, LIU Teng, SUN Xiao-guang, LI Gen
    2010, 0(7): 64-67.
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    SHA Gui-ying, LIU Cui-yun, LIU Teng, SUN Xiao-guang, LI Gen. Effect of Y Addition on Impact Deformation Behavior of Mg-3.5%Li Alloy[J]. Journal of Materials Engineering, 2010, 0(7): 64-67.

    The impact compression experiments for Mg-3.5%Li alloy and Mg-3.5%Li-0.77%Y alloy were carried out at different strain rates with the Split Hopkinson Pressure Bar.The dynamic stress-strain behavior and strain rate effect of the alloys were analyzed.Results showed that dynamic stress-strain curves of the Mg-3.5%Li alloy exhibited positive and subsequent negative strain rate effect with the increase of strain rates.The alloy was strengthened by the addition of Y,but the dynamic stress-strain behavior of the alloy still exhibits negative strain rate effect.This behavior was attributed to inner damage of the Mg-3.5%Li-0.77%Y alloy caused by the micro-crack with the increase of strain rates.
  • QI Xian-jin, WANG Yin-gang, ZHOU Guang-hong, LI Zi-quan
    2010, 0(7): 68-71.
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    QI Xian-jin, WANG Yin-gang, ZHOU Guang-hong, LI Zi-quan. Effect of Annealing on Texture and Magnetic Properties of IrMn Spin Valve[J]. Journal of Materials Engineering, 2010, 0(7): 68-71.

    The CoFe/Cu/CoFe/IrMn spin valve multilayer was deposited by high vacuum magnetron sputtering on silicon wafer substrates,the influences of annealing on texture and magnetic properties were investigated by X-ray Diffraction(XRD),Atomic Force Microscopy(AFM)and Vibrating Sample Magnetometry(VSM).The results show that the texture of IrMn(111)weaken after annealing,the surface/interface roughness first increased with low temperature annealing while decreased after high temperature annealing;the exchange bias and coercivity of the pinned layer decreased after annealing,but the coercivity of the free layer increased.Moreover,the exchange field of the annealing spin valve kept nearly unchanged as the waiting time increasing.
  • YU Mei, JIANG Wu, LIU Jian-hua, LI Song-mei, LI Ming
    2010, 0(7): 72-77.
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    YU Mei, JIANG Wu, LIU Jian-hua, LI Song-mei, LI Ming. Influence of Coloring on Optic Performance of Anodic Oxidation Film on Aluminum Alloy[J]. Journal of Materials Engineering, 2010, 0(7): 72-77.

    The UV-visible Absorption characterization of anodic oxidation film on LY12 aluminum alloy after first coloring,pickling process and second coloring with acidity black ATT was researched.Aluminum alloy anodizing process was investigated;the surface and section morphologies and crystal structure of anodic oxide films were observed with Scanning Electron Microscope(SEM)and X-ray Diffraction(XRD).The optic performance of film after coloring was researched by UV-visible spectrophotometer.The results show that the optimized process which is in favor of increasing anodic oxidation film thickness is as follows:anodizing voltage of 20V,anodizing time of 120min and film thickness of 42μm.The crystal structure was not changed by pickling process.The UV-visible Absorption characterization was increased by second coloring;the reason is that the roughness of film was improved by second coloring after pickling process.
  • HUANG Min, LI Ke-zhi, LI He-jun, FU Qian-gang, WANG Yu, Lü Xiang-hong
    2010, 0(7): 78-81,86.
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    HUANG Min, LI Ke-zhi, LI He-jun, FU Qian-gang, WANG Yu, Lü Xiang-hong. Research on Preparation and Property of Borosilicate Glass Coating for C/C Composites[J]. Journal of Materials Engineering, 2010, 0(7): 78-81,86.

    The effects of the ratio of SiO2 and B2O3,the type of addition with high melting point including MoSi2,Y2O3,SiC on the high temperature stability and fluidity of the borosilicate glass coating were studied.Borosilicate glass coating with good high temperature stability and fluidity was prepared on the surface of SiC coated carbon-carbon(C/C)composites.The isothermal oxidation resistance of SiC/borosilicate glass coated C/C composites was also tested under 1500℃ in air.The study results showed that the borosilicate glass exhibits good high temperature stability and fluidity as the ratio of SiO2 and B2O3 was 4:1.The addition of MoSi2 can improve the oxidation resistance of borosilicate coating,and the better oxidation resistance borosilicate glass coating can be obtained as the mass ratio of borosilicate glass and MoSi2 was 4:1.The mass loss of the SiC/borosilicate glass coated C/C composites was only 4.31% after oxidation for 17 h.
  • HU Li-hua, LU Min-xu, CHANG Wei, LI Zhong-tao, ZHANG Lei, XU Li-ning
    2010, 0(7): 82-86.
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    HU Li-hua, LU Min-xu, CHANG Wei, LI Zhong-tao, ZHANG Lei, XU Li-ning. Effect of Cr Content and Microstructures on the CO2 Corrosion Resistance of the Weld Joint of 1%Cr Containing Pipeline Steel[J]. Journal of Materials Engineering, 2010, 0(7): 82-86.

    The CO2 corrosion behavior of 1% Cr containing pipeline steel weld joint was researched by high-pressure high-temperature autoclave and electrochemical techniques.The purpose was to discover the effect of Cr content and microstructures in different zones on the behavior of CO2 corrosion.The results show that,the Cr element enriches in the product scale of weld metal(WM)which contains higher Cr content.The scale is thicker and more compact than other zones of the weld joint,which indicates superior CO2 corrosion resistance.The heat affected zone(HAZ)and base metal(BM)contain the same Cr content and different microstructures,the corrosion product scales of which are similar with each other.The main effect on CO2 corrosion resistance of 1%Cr containing pipeline steel weld joint is Cr content,but not microstructures.Electrochemistry tests show that,the base metal as anode would be suffered corrosion,the weld metal and HAZ as cathode would be protected.
  • ZHANG Jian-bao, XIAO Jun, WEN Li-wei, QI Jun-wei, DANG Xu-dan
    2010, 0(7): 87-91.
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    ZHANG Jian-bao, XIAO Jun, WEN Li-wei, QI Jun-wei, DANG Xu-dan. Research Progress of Automated Tape-laying Technology[J]. Journal of Materials Engineering, 2010, 0(7): 87-91.

    Based on the introduction of the advanced composite applications and requirements,the development trend of the composite low-cost manufacturing technology is expounded in this paper.The development history and application for Automated Tape-Laying(ATL)is introduced briefly,and the developments of ATL are discussed in three aspects of numerical control system,CAD/CAM/CAE and forming process.The foreign research overview of ATL technology is presented emphatically.Based on the introduction of the current domestic development present situation for ATL,the suggestions are proposed for ATL.
  • MO De-Feng, HE Guo-Qiu, HU Zheng-fei, ZHANG Wei-Hua
    2010, 0(7): 92-96.
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    MO De-Feng, HE Guo-Qiu, HU Zheng-fei, ZHANG Wei-Hua. Effect of Porosity on Fatigue Property in Aluminum Cast Alloys[J]. Journal of Materials Engineering, 2010, 0(7): 92-96.

    The effect of porosity on crack initiation and propagation has been studied in this paper.The factors,such as dimension,volume fraction,aspect ratio,and distribution of casting pores,have great influence on fatigue property.Some representational results of fatigue tests were discussed firstly,and the recent development of life model which based on initial pore size was then presented.The relationship between stress-life model and liner elastic fracture model has been pointed out.At last,some existed problems of fatigue properties in aluminum cast alloys were also discussed.
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