Started in 1985 Semimonthly
ISSN 1005-0302
CN 21-1315/TG
Impact factor:6.155

The journal has been awarded the excellent periodical in China, and its articles are covered by SCI, EI, CA, SA, JST, RJ, CSA, MA, EMA, AIA etc., PASCAL web. ISI web of Science,SCOPUS.

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      20 April 2015, Volume 31 Issue 4 Previous Issue    Next Issue
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    Orginal Article
    Ultraviolet Resistance and Antimicrobial Properties of ZnO in the Polypropylene Materials: A Review
    Mei Li, Gu Li, Juan Jiang, Zishou Zhang, Xin Dai, Kancheng Mai
    J. Mater. Sci. Technol., 2015, 31 (4): 331-339.  DOI: 10.1016/j.jmst.2014.11.022
    Abstract   HTML   PDF
    ZnO is a multifunctional material with UV-blocking, antimicrobial, photo-catalytic activity and self-cleaning properties. The application of ZnO has become an interesting subject both in science and industries in the polymer materials. A great number of investigation indicated that introduction of ZnO can improve ultraviolet resistance and endow antimicrobial properties of polypropylene (PP) materials to broaden the application range and prolong the usage life of polypropylene materials. This mini-review contains examples of recent research advances on ultraviolet resistance and antimicrobial properties of ZnO in the filled polypropylene materials. It is found that ultraviolet resistance and antimicrobial properties of ZnO supported on the surface of other inorganic particles are higher than those of nano- and micro-ZnO particles, which may inspire further developments of filled PP and its copolymer materials with high ultraviolet resistance and antimicrobial properties.
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    Enhanced Mechanical Properties of Multi-layer Graphene Filled Poly(vinyl chloride) Composite Films
    Han Wang, Guiyuan Xie, Zhe Ying, Yu Tong, You Zeng
    J. Mater. Sci. Technol., 2015, 31 (4): 340-344.  DOI: 10.1016/j.jmst.2014.09.009
    Abstract   HTML   PDF
    In order to improve mechanical properties of soft poly(vinyl chloride) (PVC) films, we used commercial multi-layer graphene (MLG) with large size and high structural integrity as reinforcing fillers, and prepared MLG/PVC composite films by using conventional melt-mixing methods. Microstructures, static and dynamic mechanical properties of the MLG/PVC composite films were investigated. The results showed that a small amount of MLG loading could greatly increase the mechanical properties of the MLG/PVC composites. The tensile modulus of the 0.96 wt% MLG/PVC composites was up to 40 MPa, increasing by 31.3% in comparison to the neat PVC. Such a significant mechanical reinforcement was mainly attributed to uniform dispersion of the large-size MLG, good compatibility and strong interactions among MLG and plasticizers and PVC.
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    Effect of SiC Location on the Ablation of C/C-SiC Composites in Two Heat Fluxes
    Lei Liu, Hejun Li, Kui Hao, Xiaohong Shi, Kezhi Li, Chang Ni
    J. Mater. Sci. Technol., 2015, 31 (4): 345-354.  DOI: 10.1016/j.jmst.2014.11.021
    Abstract   HTML   PDF
    How layer-segregated distribution of SiC affects the ablation of C/C-SiC composites was studied in the present work. A certain amount of SiC particles was deposited at the non-woven (C/C-SiC-1) and web (C/C-SiC-2) layer of 2D needle-punched carbon fibre fabric reinforced pyrocarbon composites, respectively. Ablation under oxyacetylene torch demonstrated that the two composites have similar ablation rates in heat flux of 2.38 MW/m2 whereas ablation rates of C/C-SiC-2 were much higher than those of C/C-SiC-1 when heat flux was 4.18 MW/m2. SiO2 covered partially the defective surface of both composites in the lower heat flux. The different SiC locations induced distinct defects and then led to the two composites' dissimilar ablation rates in the higher heat flux.
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    Enhanced Photocatalytic Activity in p-NiO Grafted n-TiO2 Porous Coatings
    S. Bassaki, H. Niazi, F. Golestani-Fard, R. Naghizadeh, R. Bayati
    J. Mater. Sci. Technol., 2015, 31 (4): 355-360.  DOI: 10.1016/j.jmst.2014.10.006
    Abstract   HTML   PDF
    We synthesized NiO-loaded TiO2 porous p-n junctions by electrophoretic enhanced micro arc oxidation (EEMAO) technique which is a relatively simple and new method for producing composite coatings. Phase structure, chemical composition, and surface morphology of the NiO-TiO2 coatings were investigated by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy (SEM) techniques, respectively. Photocatalytic efficiency of the samples was studied through measuring the decomposition rate of 4-chlorophenol under UV irradiation. Results showed that the coatings mainly consisted of anatase, rutile, and nickel oxide phases. It was observed that a finer surface morphology, i.e. smaller pores, was obtained at lower voltages. Besides, the amount of nickel oxide loaded to the TiO2 host increased with the voltage. The NiO-TiO2 composite coatings showed a higher photoactivity than pure TiO2 coatings revealing the effective role of NiO in decreasing the recombination rate of photogenerated electrons and holes. The maximum photocatalytic reaction rate constants for TiO2 and NiO-TiO2 samples were obtained as 0.0064 and 0.0131 min-1, respectively. We also found that there was an optimum concentration of NiO where a maximum photocatalytic activity was achieved. A correlation between growth variables, structure, and photocatalytic efficiency was established.
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    Effect of Decomposition Kinetics of Titanium Hydride on the Al Alloy Melt Foaming Process
    Donghui Yang, Jianqing Chen, Hui Wang, Jinghua Jiang, Aibin Ma, Z.P. Lu
    J. Mater. Sci. Technol., 2015, 31 (4): 361-368.  DOI: 10.1016/j.jmst.2014.09.013
    Abstract   HTML   PDF
    The gas released from the titanium hydride decomposition is one of the key factors to influence the Al alloy melt foaming process. In this study, a set of decomposition kinetic equations of titanium hydride was acquired by separating its temperature programmed decomposition (TPD) spectrum, which was acquired by a special designed TPD apparatus with argon used as carrier gas and thermal conductivity cell as the detector. According to these equations, the decomposition and hydrogen release characteristics of titanium hydride at a fixed/elevated temperature are described quantitatively, which can be applied to forecast the Al alloy melt foaming process and furnish the theoretical basis for fabrication of three-dimensional complex shaped Al alloy foam.
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    Mechanical Properties and Damage Tolerance of Bulk Yb3Al5O12 Ceramic
    Xiaofei Wang, Huimin Xiang, Xin Sun, Jiachen Liu, Feng Hou, Yanchun Zhou
    J. Mater. Sci. Technol., 2015, 31 (4): 369-374.  DOI: 10.1016/j.jmst.2015.01.002
    Abstract   HTML   PDF
    Yb3Al5O12 has potential applications as thermal barrier coatings (TBCs) because it shows low thermal conductivity and close thermal expansion coefficient to nickel-based superalloys. As a prospective TBC material, besides superior thermal properties, the mechanical properties are also important. In this paper, we present the mechanical properties of Yb3Al5O12 including elastic moduli, hardness, strength, and fracture toughness. The Young's modulus of Yb3Al5O12 is 282 GPa. The shear-modulus-to-bulk-modulus ratio of Yb3Al5O12 is 0.63, which indicates relatively low shear deformation resistance. In addition, Yb3Al5O12 exhibits high strength and fracture toughness but low hardness compared to yttria stabilized zirconia (YSZ), the most successful TBC material. SEM observation reveals that the fracture surface of Yb3Al5O12 displays “layered structure feature”, which is caused by crack deflection. Investigation based on Hertzian contact test demonstrates that Yb3Al5O12 is a damage-tolerant ceramic. Crack deflection and bridging can arouse shear faults, dissipate the local damage energy, and restrict the crack propagation within the material, which play an important role in enhancing the damage tolerance. The superior mechanical properties and good damage tolerance ensure Yb3Al5O12 a promising candidate for TBC applications.
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    Effects of the Reversely Rotating Assisted Shoulder on Microstructures During the Reverse Dual-rotation Friction Stir Welding
    J.Q. Li, H.J. Liu
    J. Mater. Sci. Technol., 2015, 31 (4): 375-383.  DOI: 10.1016/j.jmst.2014.07.020
    Abstract   HTML   PDF
    The reverse dual-rotation friction stir welding (RDR-FSW) has the capability to adjust the heat generation because of the separately designed tool shoulder and tool pin. The welding torque exerted on the workpiece by the reversely rotating shoulder is opposite to that exerted by the rotating tool pin, so the total welding torque is reduced, which is beneficial to reducing the clamping requirement of workpieces. In the present paper, a RDR-FSW joint was welded in a condition similar to the optimal welding condition of conventional FSW, and microstructures in various zones were investigated by comparison, aiming to highlight effects of the reversely rotating assisted shoulder. Due to the heat conduction of the middle cylinder and the bottom end cover on which the assisted shoulder was machined, the thermal effect of RDR-FSW was smaller than that of the conventional FSW. Moreover, the effect of assisted shoulder on the plastic flow or deformation of material or was constrained in a thin layer near the weld top surface, and thus the flow of material especially along the thickness direction was clearly decreased in the RDR-FSW. In the heat-affected zone (HAZ), the precipitate coarsening was the main evolution and was completed through the dissolution of small precipitates and the continuous growth of large precipitates. By contrast, the dissolution degree of precipitates increased significantly in the thermo-mechanically affected zone (TMAZ), and a small amount of original meta-stable precipitates transformed to block-shaped stable precipitates. Precipitate evolutions in the shoulder affected zone (SAZ) and the weld nugget zone were similar, i.e. the majority of original meta-stable precipitates dissolved into the matrix and the remainder transformed to stable precipitates, though the dissolution degree was greater in the SAZ. Compared with the conventional FSW joint, the coarsening degrees of precipitates in the HAZ and TMAZ of RDR-FSW joint were much smaller, as well as the dissolution degrees of precipitates in all four specified zones.
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    In Situ Growth Process of Mg-Al Hydrotalcite Conversion Film on AZ31 Mg Alloy
    Jun Chen, Yingwei Song, Dayong Shan, En-Hou Han
    J. Mater. Sci. Technol., 2015, 31 (4): 384-390.  DOI: 10.1016/j.jmst.2014.09.016
    Abstract   HTML   PDF
    In this study, an environment-friendly hydrotalcite film has been deposited on AZ31 Mg alloy by a two-step technique. To improve conversion film technique and control film properties, batch studies have been carried out to address various process parameters such as immersion time, pH value, and temperature of the treatment solution. The morphologies and chemical composition were characterized by scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS). The corrosion resistance of the samples with the various final films was then further compared by polarization curves. It can be concluded from the results that, at low value of pH, temperature, or long deposition time, the precursor film is mainly composed of a cracked layer. The transformation of hydrotalcite film is largely influenced by the pH value. There are optimum values of pH, temperature of the coating bath and immersion time for the film formation process to achieve the best quality and corrosion resistance of the hydrotalcite film. The optimum process is as follows: the sample is first immersed in the pretreatment solution with a pH value of about 8 at a temperature of 60 °C for 30 min to form a precursor film and then this precursor film is immersed into the post treatment solution with a pH of 10.5 at 80 °C for 1.5 h to obtain the Mg-Al hydrotalcite conversion film.
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    Influence of Deformation on the Microstructure and Low-temperature Refining Behavior of Al-3.5P Master Alloy
    Huan Qiao, Xiangzhen Zhu, Tong Gao, Yuying Wu, Xiangfa Liu
    J. Mater. Sci. Technol., 2015, 31 (4): 391-396.  DOI: 10.1016/j.jmst.2014.09.010
    Abstract   HTML   PDF
    In this paper, the influence of deformation on the microstructure and low-temperature refining behavior of Al-3.5P master alloy was investigated. The results show that the average size of AlP particles can be reduced obviously from 15.3 μm to about 2.1 μm by deformation. However, it exhibits entirely opposite influence on refining performance when Al-3.5P master alloy was deformed at room temperature and high temperature, respectively. Only when Al-3.5P master alloy was subjected to thermal deformation, can an improvement of low-temperature refining performance be obtained. In this condition, primary Si in A390 alloy can be refined from 137 to 21 μm, making it a potential candidate for die casting production. A mechanism associated with the transformation of particle-matrix interface during deformation has been proposed and further experiment has been designed to validate it.
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    Mechanical Properties Improvement of AlCrFeNi2Ti0.5 High Entropy Alloy through Annealing Design and its Relationship with its Particle-reinforced Microstructures
    Li Jiang, Hui Jiang, Yiping Lu, Tongmin Wang, Zhiqiang Cao, Tingju Li
    J. Mater. Sci. Technol., 2015, 31 (4): 397-402.  DOI: 10.1016/j.jmst.2014.09.011
    Abstract   HTML   PDF
    High entropy alloy has attracted increasing attentions. However, to enhance the alloy strength often leads to impairment of the ductility, or vice versa. Here we reported a heat treatment approach on AlCrFeNi2Ti0.5 high entropy alloy, which can elevate the strength and ductility simultaneously. An ingot of AlCrFeNi2Ti0.5 weighing 2.5 kg was firstly fabricated by medium frequency induction melting. Then samples from the same height of the bulk ingot were annealed for 6 h at 600, 700, 800 and 1000 °C, respectively. After 1000 °C annealing, an optimal microstructure was obtained by using our approach which can make some precipitation particles distribute homogeneously in the dendrite interior while keep the interdendrite structure as a single solid solution phase. The mechanical test on this AlCrFeNi2Ti0.5 alloy sample showed that, the compressive fracture strength σbc was increased by about 600 MPa and the plastic strain εp was doubled, compared with those of the as-cast sample. Our approach can be readily adapted to large-scale industrial production of high entropy alloys with high strength and ductility by proper annealing treatment.
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    Effects of Forging and Heat Treatments on the Microstructure and Oxidation Behavior of 316LN Stainless Steel in High Temperature Water
    Yueling Guo, En-Hou Han, Jianqiu Wang
    J. Mater. Sci. Technol., 2015, 31 (4): 403-412.  DOI: 10.1016/j.jmst.2014.08.014
    Abstract   HTML   PDF
    Microstructure of 316LN stainless steel (ss), including the as-received material and samples processed by solution anneal treatment and stress relief treatment after forging, was characterized by Vickers hardness (HV) testing and electron back scattering diffraction (EBSD). The oxide film formed on samples after immersion in borated and lithiated water at 583.15 K was investigated by scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). Results showed that the grain size of samples was largely reduced after forging. Higher fraction of coincidence site lattice (CSL) boundaries and lower residual strain were observed in samples with either solution anneal treatment or stress relief treatment. The proportion of CSL boundaries was largely enhanced by solution anneal treatment after forging, due to the recrystallization occurring during solution anneal treatment. The oxide film grown on 316LNss with solution anneal treatment after forging exhibited more strong protectiveness, as compared to the oxide film grown on samples with stress relief treatment after forging and the oxide film grown on as-received samples without forging. The mechanisms of oxidation were then discussed.
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    Stress Corrosion Cracking of X80 Steel in the Presence of Sulfate-reducing Bacteria
    Tangqing Wu, Maocheng Yan, Dechun Zeng, Jin Xu, Cheng Sun, Changkun Yu, Wei Ke
    J. Mater. Sci. Technol., 2015, 31 (4): 413-422.  DOI: 10.1016/j.jmst.2014.08.012
    Abstract   HTML   PDF
    The systematic laboratory studies on the roles of sulfate-reducing bacteria (SRB) in the stress corrosion cracking (SCC) susceptibility of X80 steel subjected to cathodic potential have been conducted in a near-neutral pH soil solution by slow strain rate tests. The cathodic potential and SRB increase individually the SCC susceptibility of the steel in the soil solution. The positive role of the SRB activities in SCC susceptibility depends on the prolongation of pre-incubation time, and the SCC susceptibility of the steel increases under more negative potentials. What's more, the applied potentials and the presence of SRB work together in promoting the SCC susceptibility of the steel. But, the combined action becomes limited with decreasing cathodic potentials. The relationships between the plasticity loss and the permeable hydrogen concentration were established for the steel in the soil solution, regardless of under open circuit potential or cathodic potentials, in both the sterile and SRB inoculated conditions. The relationships are practically significant for the selection of safe cathodic protection (CP) potentials in the presence of SRB in soil environment.
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    Kinetics of Al Evaporation from Liquid U-Al Alloys in Vacuum Induction Melting
    Y.J. Duan, B. Chen, Y.C. Ma, K. Liu
    J. Mater. Sci. Technol., 2015, 31 (4): 423-426.  DOI: 10.1016/j.jmst.2014.07.019
    Abstract   HTML   PDF
    A research on kinetics of Al evaporation from liquid U-Al alloys was made in a vacuum induction melting (VIM) furnace at 1673-1843 K. The evaporation rate of Al was found to be first order with respect to Al content in the melt. The overall mass transfer coefficient of Al was determined and it was found that the evaporation rate of Al increased with increasing temperatures. The apparent activation energy of Al evaporation at 1673-1843 K was 171.5 kJ mol-1. The value of mass transfer coefficient of Al in the liquid phase was estimated to be 3.77 × 10-6, 7.41 × 10-6, and 9.40 × 10-6 m s-1 at 1673, 1753, and 1843 K, respectively. Meanwhile, rate determining steps were discussed and it was concluded that the evaporation rate of Al is mainly controlled by liquid phase mass transfer.
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ISSN: 1005-0302
CN: 21-1315/TG
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