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

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    ARTICLES
    Research Status and Developing Trends of Preparation and Interface Control of Magnesium Matrix Composites with Carbon-containing Reinforcements
    ZHOU Haitao, WANG Yanbo, XIAO Lu, SUN Jingli, XU Yuling, CHEN Ge
    Chinese Journal of Materials Research, 2020, 34 (11): 801-810.  DOI: 10.11901/1005.3093.2020.109
    Abstract   HTML   PDF (9769KB) ( 281 )

    Magnesium matrix composites with extremely strong design flexibility in properties are expected to meet the needs of low-density, high-strength and high stiffness materials in fields such as aerospace, military, and electronic packaging etc. However, there are still many problems needed to be solved for the application, especially the uniform dispersibility of reinforcements and the interface of reinforcement/matrix. In this article, the composition of magnesium matrix composites and the respective functions were introduced firstly. Then, the dispersion technology for reinforcements and the optimization technology for the interface of reinforcement/substrate were also discussed in detail. At last, the new ideas and developing trends were forecasted especially in terms of the limitations of mechanical properties for the magnesium matrix composites at the present.

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    Research Progress on Stability of CsPbI2Br Inorganic Perovskite Solar Cells
    WU Qiaofeng, ZHANG Fu, YU Yue, ZHANG Meng, YU Hua, FAN Shuanshi
    Chinese Journal of Materials Research, 2020, 34 (11): 811-821.  DOI: 10.11901/1005.3093.2020.158
    Abstract   HTML   PDF (8877KB) ( 822 )

    Inorganic perovskite materials have excellent thermal stability due to that the volatile organic components (MA+, FA+) in organic-inorganic hybrid perovskite materials are completely replaced by cesium ions (Cs+). Inorganic perovskite solar cells (IPSCs) are favored by researchers internationally due to their excellent thermal stability. Since the CsPbI2Br was used as the photoactive layer for the first time in 2016, its photoelectric conversion efficiency (PCE) increased from 9.84% to 18.06%, but the device stability of IPSCs still restricts its commercial application progress. This paper reviews the unstable factors of CsPbI2Br IPSCs and summarizes the recent research progress on the stability of CsPbI2Br IPSCs from three aspects: preparation methods, ion doping, and interface optimization. Finally, an outlook on the research challenges and prospects of CsPbI2Br based IPSCs was proposed and discussed.

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    Effect of Electron-beam Radiation on Properties of Oriented Poly (ether-ether-ketone)
    DING Renhao, CAO Dan, XU Lu, WANG Ziqiang, LI Jianxi, MA Hongjuan
    Chinese Journal of Materials Research, 2020, 34 (11): 822-828.  DOI: 10.11901/1005.3093.2020.148
    Abstract   HTML   PDF (4338KB) ( 176 )

    The effect of electron-beam (EB) radiation on the properties of oriented PEEK sheets in air at room temperature were investigated herein. While the effect of different absorbed doses of EB on the crystallinity, thermal stability, mechanical properties and thermal shrinkage properties of PEEK sheets in the direction of stress (parallel direction) and perpendicular to the direction of stress (vertical direction) was assessed by means of X-ray diffractometer (XRD), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC) and a universal tension machine. The results show that the crystallization temperature, melting enthalpy and crystallinity of the samples decreased with the increasing absorbed doses within the designed absorbed dose range. The thermal stability of the samples decreased with the increasing absorbed doses. The tensile stress and elongation at break in the parallel and vertical directions of the irradiated samples in air decreased with the increasing absorbed doses. The thermal shrinkage ratio of the samples after irradiation in the parallel direction was twice as high as that in the vertical direction, and was constant in these two directions under different absorbed doses.

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    Preparation of Nano Zinc Oxide/Sodium Alginate Composite Film by Electrodeposition
    LI Hui, PAN Jie, CAO Kaiyuan, LIU Hui, YIN Jie, WANG Yifeng
    Chinese Journal of Materials Research, 2020, 34 (11): 829-834.  DOI: 10.11901/1005.3093.2020.147
    Abstract   HTML   PDF (5828KB) ( 214 )

    Nano zinc oxide was synthesized by hydrothermal method with sodium alginate as stabilizer, and then the composite film of nano zinc oxide/sodium alginate was prepared by electrodeposition. The particle size and chemical structure of ZnO nanoparticles as well as the morphology of the composite film were characterized. The results show that the composite film had good antibacterial properties against Escherichia coli and Staphylococcus aureus, whilst the film had good photocatalytic degradation effect on methylene blue dye.

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    Preparation and Properties of PVDF Based Dielectric Nanocomposites Containing Multi-scale Functional Fillers
    CHEN Lin, HUANG Jiao, YAN Lei, GUO Yi, LIN Hong, LIN Hailan, BIAN Jun
    Chinese Journal of Materials Research, 2020, 34 (11): 835-844.  DOI: 10.11901/1005.3093.2020.187
    Abstract   HTML   PDF (8326KB) ( 212 )

    Four hybrid BT/MWCNTs nanomaterials (BT-A/MWCNTs-B, where A= 5,10) were prepared by two kinds of acidified multi-wall carbon nanotubes (MWCNTs) with lengths of 10-20nm and 20-40nm respectively and two kinds of hydroxylated barium titanate (BT) with diameters of 50nm and 100nm respectively. The effect of multi-scale dielectric fillers BT-A/MWCNTs-B on the mechanical properties, heat resistance and dielectric properties of nanocomposites was investigated by means of X-ray diffractometer (XRD), infrared spectra (FTIR), differential scanning calorimetry analysis (DSC), scanning electron microscope (SEM), tensile properties and dielectric properties testing. Results show that compared with BT/PVDF and MWCNTs/PVDF nanocomposites, BT-A/MWCNTs-B/PVDF nanocomposites have higher crystallinity and thermal properties. When the content (mass fraction) of BT-10 and MWCNTs-2 was 16% and 5% respectively, the melting temperature of BT-10/MWCNTs-2/PVDF nanocomposites could reach 173.8℃, which was 14.2℃ higher than that of pure PVDF (159.6℃), and the crystallinity could reach 43.1%. The three-phase BT-A/MWCNTs-B/PVDF nanocomposites had better dielectric performance than that of the two-phase nanocomposites. At 100Hz, the dielectric constant of BT-10/MWCNTs-2/PVDF nanocomposites could reach 119, 14 times of that of pure PVDF, and the dielectric loss was only 0.051. The tensile strength and elastic modulus of BT-10/MWCNTs-2/PVDF nanocomposites were up to 57.7 MPa and 1226 MPa, respectively.

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    Effect of Tempering Temperature on Microstructure and Properties of Intercritical Annealing Marine Steel
    ZHANG Xiangyun, LI Jiguang, YAN Ling, HE Xuze, GUO Jing
    Chinese Journal of Materials Research, 2020, 34 (11): 845-852.  DOI: 10.11901/1005.3093.2020.070
    Abstract   HTML   PDF (6511KB) ( 153 )

    The influence of tempering temperature on microstructure and mechanical properties of 690 MPa grade marine steel after quenching + intercritical annealing + tempering three-step heat treatment was investigated in terms of the microstructure evolution, the volume fraction of retained austenite and the change in mechanical properties. The results show that the microstructure of the steel after tempering is a mixture of tempered bainite/martensite, intercritical ferrite and retained austenite. With the increasing tempering temperature, bainite/martensite and intercritical ferrite gradually decomposed into small grains, while the volume fraction of retained austenite gradually increased. Yield strength decreased from 787 MPa to 716 MPa. Plasticity and low temperature toughness were significantly enhanced, elongation after fracture increased from 20.30% to 29.24%, and impact energy at -40℃ increased from 77 J to 150 J. The increase of the volume fraction of retained austenite lead to the increase of crack propagation work, which was the main cause responsible to the improvement of low temperature toughness. The decomposition of bainite/martensite and the formation of retained austenite lead to grain refinement, the number of dislocations with low KAM values in the grains increased, and the frequency of low angle grain boundary peaks increased, which may be beneficial to the significant increment of plasticity and toughness of the steel.

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    Simulation Calculation for Adsorption Mechanism of Tris (chloroisopropyl) Phosphate on Surface of Montmorillonite
    LIU Shanshan, LAN Yanhua, YANG Rongjie, ZHOU Zhiming
    Chinese Journal of Materials Research, 2020, 34 (11): 853-860.  DOI: 10.11901/1005.3093.2020.075
    Abstract   HTML   PDF (6490KB) ( 89 )

    To explore the gelation mechanism of tris (chloroisopropyl) phosphate (TCPP) and sodium montmorillonite (NaMMT), the molecular models of TCPP and NaMMT at the micro level were established based on the density functional theory method, The adsorption parameters of TCPP on 001 lattice plane and interplanar of NaMMT in anhydrous and hydrous conditions were calculated. The results show that TCPP can stably adsorb on the 001 lattice plane and interplanar of NaMMT through physical force. And sodium ions are beneficial to the adsorption of TCPP on NaMMT surface. In the presence of water molecules TCPP and water molecule on the surface of NaMMT exhibit synergistic adsorption, and water molecules serve as "bridges" to connect TCPP and NaMMT surfaces, enhancing interaction between them. Experimental research also shows that water can significantly accelerate the gelation rate of TCPP and NaMMT. NaMMT and TCPP swell spontaneously through strong interaction to form a physical cross-linked structure, and then the network can absorb a large amount of TCPP liquid, and water molecules enhance the interaction of the system, making the cross-linked network easier to form, which accelerate the gelation process.

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    Massive Preparation and Supercapacitor Performance of Layered Ti3C2
    YANG Zhanxin, WU Qiong, REN Yiqiao, QU Kaikai, ZHANG Zhehao, ZHONG Weili, FAN Guangning, QI Guochao
    Chinese Journal of Materials Research, 2020, 34 (11): 861-867.  DOI: 10.11901/1005.3093.2020.167
    Abstract   HTML   PDF (9587KB) ( 133 )

    The high-purity precursor material Ti3AlC2 was prepared via in situ sintering technology with mixed powders of titanium, aluminum, graphite and a small amount of tin as raw material by changing the ratio of powders and sintering time. Then the precursor material Ti3AlC2 was subjected to selective etching with concentrated hydrofluoric acid, and finally massive material of layered Ti3C2 with adjustable layer spacing was prepared by changing the etching time. The microstructure and microscopic morphology of the layer spacing of Ti3AlC2 and Ti3C2 were characterized by X-ray diffractometer and field emission scanning electron microscopy and their electrochemical performance was comparatively assessed. Among others, the specific capacity of the present prepared electrode under the same condition is greatly improved, showing good performance of supercapacitor.

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    Effect of Molybdenum Content on Microstructure and Corrosion Resistance of CoCrFeNiMo High Entropy Alloy
    LIU Qian, WANG Xinyang, HUANG Yanbin, XIE Lu, XU Quan, LI Linhu
    Chinese Journal of Materials Research, 2020, 34 (11): 868-874.  DOI: 10.11901/1005.3093.2020.269
    Abstract   HTML   PDF (5073KB) ( 288 )

    High entropy alloys have been extensively paid attention in the coating industry due to their excellent mechanical properties and corrosion resistance. CoCrFeNiMox high-entropy alloy coatings were prepared on the surface of Q235 steel by laser cladding with synchronous powder feeding. The microstructure, microhardness and corrosion resistance of the coatings were studied. The corrosion mechanism of the alloys was analyzed and the strengthening mechanism of their corrosion resistance was revealed combined with the first-principle calculation. The results show that CoCrFeNiMo0.1 and CoCrFeNiMo0.2 are composed of the fcc phase. The fcc phase and tetragonal CrMo phase are both observed in the CoCrFeNiMo0.3 high-entropy alloy layer. The microstructure of the alloys is composed of dendrites. Cr and Mo elements are enriched in the interdendritic, and Co and Fe elements are enriched in the dendrites. CoCrFeNiMox high-entropy alloys have excellent comprehensive corrosion resistance in 3.5% (mass fraction) NaCl solution. As the content of Mo increases, the corrosion potential shifts to more positive potentials, the corrosion current density decreases, the length of polarization region increases, the impedance arc radius increases, and the electrode reaction resistance increases. It is found via the first-principle calculation that the higher corrosion resistance of the coating is related to its dense passivation film.

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    Band Gap Energy and Near Band Edge Emission Blue Shifts of ZnO Nanorods Prepared by Electrodeposition
    TANG Yang
    Chinese Journal of Materials Research, 2020, 34 (11): 875-880.  DOI: 10.11901/1005.3093.2020.086
    Abstract   HTML   PDF (3826KB) ( 160 )

    ZnO nanorod arrays were fabricated by electrodeposition in the traditional electrolytes incorporated with addition of salts such as NH4NO3 and Ga(NO3)3, so that the phyisical properties, such as the diameter, density, band gap energy, near band edge emission and stokes shift of the prepared ZnO nanorod arrays may be designed and tailored. Namely their diameter can be adjusted between 63 nm to 77 nm. With the use of Ga(NO3)3 as the additive, the density of ZnO nanorod arrays can be decreased to 7.0×109 /cm2; the band gap energy of the ZnO nanorod arrays showed blue shift from 53 meV to 73 meV with the stokes shift of 23 meV, which indicated that the new process of involving the Ga(NO3)3 resulted in the suppression of the non-radiative recombination.

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