ISSN 1005-3093
CN 21-1328/TG
Started in 1987

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Preparation and Characterization of Nano Melamine Cyanurate and Its Application in Phenolic Foam
Nano melamine cyanurate (NMC) was synthesized by a solvothermal method, and characterized by FTIR, XRD and SEM. The effect of solvents, surfactants, reaction-temperature and -time on the particle size of the product were investigated. NMC can be only obtained by using distilled water as a solvent, a. . .
Chinese Journal of Materials Research, 2014 Vol. 28 (6): 401-406    DOI: 10.11901/1005.3093.2013.857
 
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      25 May 2018, Volume 32 Issue 5 Previous Issue    Next Issue
    ARTICLES
    Effect of Applied Pulse Current on Deformation Behavior of Ti-6Al-4V Alloy Charged with 0.27% H
    Zhiyong ZHAO, Hongliang HOU, Yanling ZHANG, Fan WU, Guofeng WANG
    Chinese Journal of Materials Research. 2018, 32 (5): 321-326.   DOI: 10.11901/1005.3093.2017.450
    Abstract   HTML   PDF (4415KB)

    The effect of applied pulse current on the deformation behavior of Ti-6Al-4V alloy charged with 0.27% H (mass fraction) was investigated by compression test, while the fractured surface was characterized by SEM. Results show that the mechanical property of Ti-6Al-4V alloy with and without charge of 0.27% H are both improved by the applied pulse current, i.e. the decrease of deformation resistance and increase of compression elongation. Joule heating effect of the pulse current is the main reason for the mechanical property change of Ti-6Al-4V alloy with charge of 0.27% H. The fracture mode of Ti-6Al-4V alloy changed from brittle intergranular fracture to quasi cleavage transgranular fracture due to the action of electro-plastic effect. But the quasi cleavage fracture characteristics of the Ti-6Al-4V alloy with charge of 0.27% H is not so obvious as that of the as-received alloy due to the apparent hydrogen embrittlement at low temperature.

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    Preparation and Characterization of Temperature-responsive Hollow Nanofibrous Membrane
    Yifan ZHOU, Xie ZHENG, Jianfeng ZHOU, Liusheng ZHA
    Chinese Journal of Materials Research. 2018, 32 (5): 327-332.   DOI: 10.11901/1005.3093.2017.431
    Abstract   HTML   PDF (2661KB)

    The temperature-responsive tri-copolymer (PNNS) i.e. poly(N-isopropylacrylamide-co-N-hydroxymethylacrylamide-co-octadecyl acrylate) with number-average molecular weight of 2.24×104 g/mol and lower critical solution temperature of 35.8℃ was firstly synthesized via solution free radical polymerization, and then the chemical structure of which was confirmed by nuclear magnetic resonance spectrometer, and thereby the measured molar ratio of its three substances is 100∶27∶5. The hollow nanofibrous membrane with high stability in aqueous medium were prepared by coaxial electrospinning technique using the ethanol and water solution of PNNS as shell spinning solution and mineral oil as core spinning solution, followed by the processes of heat treatment and extracting the oil by toluene. Results show the membrane component of nanofibers presents hollow structure, of which the shell thickness gradually decreases with the increase of the flow rate of the core spinning fluid; The membrane in aqueous medium shows remarkable temperature-responsiveness; When the aqueous medium temperature is raised from 25℃ to 50℃, the percentage of area shrinkage of the membrane reaches above 50%; When the aqueous medium temperature changes alternately between 25℃ and 50℃, the hollow nanofibrous membrane may experience swelling and deswelling alternatively, but it could reach an equilibrium within 10s for the two cases.

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    Mechanical Properties of Ti-5Al-2.5Sn ELI Powder Compacts
    Ruipeng GUO, Jing ZHANG, Lei XU, Jiafeng LEI, Yuyin LIU, Rui YANG
    Chinese Journal of Materials Research. 2018, 32 (5): 333-340.   DOI: 10.11901/1005.3093.2017.377
    Abstract   HTML   PDF (4202KB)

    The Ti-5Al-2.5Sn with extra-low interstitial (ELI) powder compacts were fabricated by hot isostatic pressing (HIPing) via a pre-alloyed approach. The effect of powder pre-treatment and heat treatment of powder compacts on the microstructure and mechanical properties of Ti-5Al-2.5Sn ELI alloy are investigated. Results show that the best balance of oxygen content and fraction of hollow powder can be obtained for the powder with full size range. However, the particle size segregation of the pre-alloyed powder, which should be avoided during the powder filling, will degrade the tensile properties of the alloy at cryogenic temperature due to the gathering of gas bubble. The degassing temperature of titanium alloy-powder should be below the limitation of their service temperature, i.e. 400oC in this study. When the powder compact is annealed at (α+β) phase region, the microstructure coarsens significantly and the thermal induced porosity will emerge due to the rapid growth and expansion of the residual micro-pores. The suggested annealing temperature of powder compact is below 800oC. Finite element modeling (FEM) was used to predict the shrinkage of the encapsulated powder and optimize the tooling design. Based on FEM results, impellers of the Ti-5Al-2.5Sn ELI powder alloy have been successfully fabricated through HIPing route. The mechanical properties of powder metallurgy impeller are close to those of wrought materials.

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    Influence of Annealing Temperature on the Metal-catalyzed Crystallization of Tetrahedral Amorphous Carbon to Graphene
    Panpan LIU, Hanchao LI, Lin YANG, Ting GUO, Peiling KE, Aiying WANG
    Chinese Journal of Materials Research. 2018, 32 (5): 341-347.   DOI: 10.11901/1005.3093.2017.107
    Abstract   HTML   PDF (3023KB)

    In order to investigate the transformation behavior of tetrahedral amorphous carbon (ta-C) into graphene, a three-layered structure material of metal catalyst Ni/ tetrahedral amorphous carbon (ta-C)/Si-substrate was prepared via a two-step process, namely ta-C film was firstly deposited on Si-substrate with a home-made filtered cathodic vacuum arc system, then on which (111) preferential oriented Ni-film was further deposited by electron beam evaporation method. Afterwards the as prepared three-layered structure material was treated via a controlled rapid thermal annealing method in order to transform (ta-C) into graphene. Meanwhile,the effect of annealing temperature on the graphene growth was focused. Results show that both the deposited films of ta-C and Ni all present smooth and uniform surface morphology, which provide the premise for growing high-quality graphene. Furthermore, the annealing temperature plays great role on the crystallization of amorphous carbon into graphene. When the annealing temperature was above 400°C, the multilayered graphene could form on Ni surface, and the better quality of graphene was obtained through annealing at 500°C for 15 min.

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    Compression Performance after Being Subjected to Impact of Ultra-thin Composite Laminates for Helmet
    Huan MA, Guoli ZHANG, Youxin ZHU, Weiwei WANG, Zhipeng WANG
    Chinese Journal of Materials Research. 2018, 32 (5): 348-356.   DOI: 10.11901/1005.3093.2017.285
    Abstract   HTML   PDF (2665KB)

    Ultra-thin composite laminates of 1.30 mm for making helmet were fabricated by 5-harness satin weave cabon fiber fabric, plain weave carbon fiber prepreg and kevlar multilayered biaxial weft knitted (MBWK) fabric with different areal weight. The stacking sequence were [0°/0°/0°]T and [45°/0°/45°]T. The composite laminates were subjected to given drop hammer impacts and then the mechanical property of compression after impact (CAI) was measured and analyzed. The impact damage was assessed subsequently by coupled ultrasound scanner and the damage area was calculated by image analysis software of Image Pro Plus, and the influence of reinforcement, stacking sequence on CAI were investigated. It is observed that reinforcement with [45°/0°/45°]T could restrain the propagation of crack along the fiber direction, nevertheless, the impact point of laminates was seriously damaged. And the dent depth was smaller with the increasing areal weight of MBWK fabric. Compared with other structures, the ultra-thin composite laminate, prepared with stacking sequence of [0°/0°/0°]T, bottom layer of carbon fiber prepreg, the middle layer of MBWK fabric and the top layer of 5-harness satin carbon fabric, presented the smallest damage area and dent depth i.e. 225.28 mm2 and 0.16 mm respectively, correspondingly the residual compressive strength reaches the maximum of 97.43 MPa and the compressive strength retention rate was 75.72%. It follows that this reinforcement structure exhibits excellent compresion performance after being subjected to drop hammer impact effect.

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    Microstructural Evolution and Mechanical- and Electrical-Property of Cold-Drawn and -Rolled Electrical Aluminum Wires
    Xuemei LUO, Hongyun YU, Rui LI, Zuman SONG, Qiang WANG, Zhefeng ZHANG, Guangping ZHANG
    Chinese Journal of Materials Research. 2018, 32 (5): 357-364.   DOI: 10.11901/1005.3093.2017.181
    Abstract   HTML   PDF (2395KB)

    Commercial A4 pure aluminum electrical wire was subjected to cold drawing and cold rolling respectively, and then their microstructure, strength and electrical conductivity were investigated systematically. Results show that in the case of less deformation, the microstructure both of the cold drawn and rolled aluminum electrical wires consists of elongated grains with low-angle grain boundaries and dislocation substructures; In case of similar equivalent strain deformation, there exists higher percentage of high-angle grain boundaries in the cold-rolled wires. While the strength and ductility of the cold drawn wires are higher than that of the cold rolled ones. Finally, the relationship between deformation strengthening and conductivity of the pure aluminum was elucidated.

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    Synthesis of Mg-Fe-Al Composite Spinel by Carbon Thermal Reduction Method
    Yanhui WANG, Shujiang CHEN, Guohua LI, Lin TIAN, Lijie SUN
    Chinese Journal of Materials Research. 2018, 32 (5): 365-370.   DOI: 10.11901/1005.3093.2017.156
    Abstract   HTML   PDF (1904KB)

    Mg-Fe-Al composite spinel was synthesized via carbon thermal reduction method at 1550℃ with a size of ?20 mm×10 mm. The phase composition and the microstructure of the prepared composite spinel was characterized by X ray diffractometer and scanning electron microscopy respectively. The lattice constant and the unit cell volume of the Mg-Fe-Al composite spinel were calculated by combining the interplanar spacing of the specific crystal plane. Potassium dichromate volumetric method was used to determine the content of ferrous oxide in the composite spinel. Results show that two kinds of Mg-Fe-Al composite spinel with different morphology were produced,of which the lattice constant and unit cell volume are larger than those presented in standard cards for MgO·Al2O3 and the main peaks of which shift to the lower angle side. A small amount of MgO and Al2O3 were reduced by C forming Mg- and Al-vapor, which then react with CO and O2 depositing as acicular MgO·Al2O3. The presence of liquid phase at high temperature promoted the formation of Al15.99Mg7.64Fe0.37O32 phase. A large amount of MgO and Al2O3 reacted directly to form granular MgO·Al2O3, Fe2+ and Fe3+ diffused into MgO·Al2O3 crystallites to form Mg8.13Al14.25Fe1.13O32 phase. The content of FeO in the composite spinel was 2.38% measured by potassium dichromate volumetric method.

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    Second-phase Precipitation in Mo/Nb/Ta/Ti Minor-alloyed 310S Stainless Steel at 700℃
    Yang LV, Donghui WEN, Zhenhua WANG, Qing WANG, Rui TANG, Huan HE
    Chinese Journal of Materials Research. 2018, 32 (5): 371-380.   DOI: 10.11901/1005.3093.2017.627
    Abstract   HTML   PDF (8791KB)

    The microstructural stability and second-phase precipitation of austenitic stainless steels (ASSs) with high Cr and Ni contents at high temperatures affect their mechanical property directly. The effect of minor-addition of Mo, Nb, Ta, and Ti on the second-phase precipitation in a low-carbon 310S stainless steel (Fe-25Cr-22Ni-0.046C, %, mass fraction) has been investigated in the present work. Alloy ingots were prepared by vacuum arc melting, and hot rolled at 1150℃ for multiple passes into sheets. The sheet samples were then heat-treated in sequence: solid-solution at 1150℃ for 0.5 h followed by water cooling, stabilization at 900℃ for 0.5 h followed by furnace cooling, and aging treatment at 700℃ for different times (25~408 h). The steels were characterized by means of XRD, OM, SEM and TEM. Their mechanical property were examined after different treatments. Experimental results show that the co-addition of minor Mo/Nb/Ta/Ti improves the strength of the steels. However, the brittle σ-phase began to appear at the early stage of stabilization process in the Mo/Nb/Ta/Ti-modified steel, while it was not existed in the master steel 310S. During the aging process, the content of σ-phase particles increases with the increase of aging time, and the coarse Cr23C6 particles will be dissolved finally, which will deteriorate the mechanical property of the steels. Both the types and amounts of minor-alloying elements affect the second-phase precipitation, and then the microstructural stability.

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    Effect of Axial Magnetic Field on Property of TiN/Cu Films Deposited by Arc Ion Plating
    Shengsheng ZHAO, Yanhui ZHAO, Wei CHEN, Jiaxi FEI, Tiegang WANG
    Chinese Journal of Materials Research. 2018, 32 (5): 381-387.   DOI: 10.11901/1005.3093.2017.600
    Abstract   HTML   PDF (3254KB)

    TiN/Cu thin films were prepared on stainless steel substrate by arc ion plating with adjustable axial magnetic field. The effect of axial magnetic field intensity on the microstructure, chemical composition, mechanical properties and wear resistance of the films were investigated. Results indicated that all the TiN/Cu thin films deposited by different magnetic field intensity have the same crystallographic structure as TiN with preferential orientation (111). With the increasing magnetic field intensity, the diffraction peak intensity of (111) crystal plane significantly enhanced; the surface roughness of TiN/Cu film decreased first and then increased; the Cu content of the film increased gradually; the hardness and elastic modulus of the TiN/Cu film also increased and the wear rate first decreased then increased. When the magnetic field strength reached 80 Gs, the resulted film possessed the highest hardness about 36 GPa and the optimal wear resistance.

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    Effect of Quenching Temperature on Cryogenic Mechanical Properties of a 7Ni Steel
    Hongwei CAO, Xinghong LUO, Shi LIU
    Chinese Journal of Materials Research. 2018, 32 (5): 388-394.   DOI: 10.11901/1005.3093.2017.193
    Abstract   HTML   PDF (4788KB)

    The effect of quenching temperature on cryogenic strength and toughness of a 7Ni steel was investigated. The microstructure and volume fraction of reversed austenite were characterized by means of OM, SEM, TEM, XRD. Results show that cryogenic toughness of the steel sharply decreased when quenching temperature increased from 830℃ to 930℃. And cryogenic tensile strength as well as yield strength were obviously decreased with increasing quenching temperature. What's more, elongation also decreased at higher quenching temperature, and has a consistent variation tendency with cryogenic strength. Grains of prior austenite and martensite packets were fine in the steel quenched at 830℃, but grains and packets grew significantly at higher quenching temperature. Cryogenic strength and toughness decreased with growth of grain sizes and packet width. Coarsen microstructure has a adverse effect on cryogenic strength and toughness. The amount of reversed austenite showed downtrend basically by increasing quenching temperature. The steel quenched at 830℃ has a maximum of reversed austenite amount and impact energy.

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    Effect of Cr Addition on Tribological Properties of Ni3Si Alloys
    Muye NIU, Xinghua ZHANG, Haicheng ZHAO, Yu XIA, Jiajie LIU
    Chinese Journal of Materials Research. 2018, 32 (5): 395-400.   DOI: 10.11901/1005.3093.2017.176
    Abstract   HTML   PDF (3814KB)

    Ni3Si alloys were microalloyed via arc melting with small amounts of Cr and B for improving their mechanical properties. The microstructure, phase composition and tribological property of Ni3Si alloys were investigated. Results show that Ni3Si alloy was mainly composed of β1-Ni3Si and γ-Ni31Si12 phases; with the increasing Cr-conten the phase composition was changed to γ-Ni31Si12 and α-Ni, and then changed to γ-Ni31Si12 and Cr3Ni5Si2; the microhardness increased along with the increasing Cr-content; during the dry sliding friction the friction coefficients of the alloys were about 0.5 and their wear rates were much lower than that of 316 stainless steel. The optimum addition of Cr for the best tribological property of the Ni3Si alloy was 5% Cr (in mass fraction). With the increasing load the wear mechanisms of Ni3Si alloys with 0% and 5% Cr exhibited significant change from abrasive wear to adhesive wear. The wear mechanisms of the alloys with 10% Cr were all the fatigue wear within the range of the test load.

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