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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      28 September 2012, Volume 28 Issue 9 Previous Issue    Next Issue
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    Biomaterials
    Preliminary Study on Cytotoxic Effect of Biodegradation of Magnesium on Cancer Cells
    Yu Zhang, Ling Ren, Mei Li, Xiao Lin, Huafu Zhao, Ke Yang
    J. Mater. Sci. Technol., 2012, 28 (9): 769-772. 
    Abstract   HTML   PDF

    Biodegradation of magnesium (Mg) based metals in body fluid can lead to a strong alkalinity as well as an increase of Mg2+ concentration in its surrounding environment. In vitro cytotoxic effects of the extracts of pure Mg with and without micro arc oxidation (MAO) coating on osteosarcoma U2-OS cells, a kind of bone cancer cells, were preliminarily studied, independently considering the increase of either alkalinity or Mg2+ concentration. The results indicated that the high alkalinity, i.e., a great increase of pH value, caused by the degradations of Mg with and without MAO coating in the culture medium all showed strong cytotoxic effects on U2-OS cells. However, the increase of Mg2+ concentration had no such cytotoxic effect. This finding may provide an alternative way to cure bone cancers through creating a high alkalinity surrounding the cancer cells.

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    Synthesis and Characterization of Tb-incorporated Apatite Nano-scale Powders
    L.J. Sun, P.F. Ni, D.G. Guo, C.Q. Fang, J. Wang, F. Yang, X.F. Huang, Y.Z. Hao, H. Zhu, K.W. Xu
    J. Mater. Sci. Technol., 2012, 28 (9): 773-778. 
    Abstract   HTML   PDF

    Nano-scale Tb-incorporated apatite (nano-Tb-AP) particles with different Tb contents (Tb/(Tb+Ca)) of 0%, 5%, 10% and 20% were synthesized through a simple wet chemical method in this study. The crystal structure, thermal stabilities, chemical groups, crystal morphologies and crystal sizes of the nano-Tb-AP particles were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and transmission electron microscopy (TEM), respectively. It was found that lattice constants, particle sizes, crystalline and thermal stability varied with the doped Tb contents. With the increasing of Tb content, the lattice constants, particle size, length/diameter ratio, crystalline and thermal stability of nano-Tb-AP gradually decrease. Especially, almost all the 20%Tb-AP nano particles had been decomposed at 1200 °C while only a few of the decomposed products (β-TCP) were detected in the Tb-free nano apatite powders. This kind of nano-scale Tb-incorporated apatite exhibits an extremely potential clinic application because it integrates both the excellent biological functions of Tb element and apatite in human body.

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    Surface Characterization and Cell Response of Binary Ti-Ag Alloys with CP Ti as Material Control
    B.B. Zhang, K.J. Qiu, B.L. Wang, L. Li, Y.F. Zheng
    J. Mater. Sci. Technol., 2012, 28 (9): 779-784. 
    Abstract   HTML   PDF

    In this study, the surface passive films, dissolution behavior and biocompatibility of Ti-Ag alloys (with 5%, 10% and 20% Ag) were evaluated by X-ray diffraction (XRD) tests, electrochemical corrosion tests, X-ray photoelectron spectroscopy (XPS) tests, dissolution tests and in-vitro cytotoxicity tests. The surface films on the Ti-20Ag alloy are rich in Ti and much deficient in Ag with respect to alloy composition, as identified by XPS. Compared to CP Ti, Ti-5Ag and Ti-20Ag alloys show larger impedances and lower capacitances, which can be associated with an increase of the passive layer thickness. Moreover, all Ti-Ag alloys exhibit negligible or low metal release in the test solutions. The in-vitro cytotoxicity results show Ti-Ag alloys seem to be as cytocompatible as CP Ti. From the viewpoint of surface passive film and cytotoxicity, Ti-5Ag and Ti-20Ag are considered to be more suitable for dental applications.

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    High Temperature Structural Materials
    Effects of Surface State and Applied Stress on Stress Corrosion Cracking of Alloy 690TT in Lead-containing Caustic Solution
    Zhiming Zhang, Jianqiu Wang, En-Hou Han, Wei Ke
    J. Mater. Sci. Technol., 2012, 28 (9): 785-792. 
    Abstract   HTML   PDF

    The effects of surface state and applied stress on the stress corrosion cracking (SCC) behaviors of thermally treated (TT) Alloy 690 in 10 wt% NaOH solution with 100 mg/L litharge at 330 °C were investigated using C-ring samples with four kinds of surface states and two different stress levels. Sample outer surfaces of the first three kinds were ground to 400 grit (ground), shot-peened (SP) and electro-polished (EP) and the last one was used as the as-received state. Two samples of every kind were stressed to 100% and 200% yield stress of Alloy 690TT, respectively. The results showed that the oxide film consisted of three layers whereas continuous layer rich in Cr was not found. The poor adhesive ability indicated that the oxide film could not protect the matrix from further corrosion. Lead was found in the oxide film and the oxides at the crack paths and accelerated the dissolution of thermodynamically unstable Cr in these locations and also in the matrix. The crack initiation and propagation on Alloy 690TT were effectively retarded by SP and EP treatments but were enhanced by grinding treatment, compared with the cracks on the as-received surface. The cracking severity was also enhanced by increasing the externally applied stress. The accelerated dissolution of Cr and the local tensile stress concentration in the near-surface layer caused by cold-working and higher applied stress reduced the SCC-resistance of Alloy 690TT in the studied solution.

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    Effect of Deposition Temperature on Dynamics and Mechanism of Deposition for Si-B-C Ceramic from BCl3/SiCH3Cl3/H2 Precursor
    Xinzhang Zuo, Litong Zhang, Yongsheng Liuy, Siwei Li, Laifei Cheng
    J. Mater. Sci. Technol., 2012, 28 (9): 793-798. 
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    The deposition rate, phase, chemical composition and microstructure of deposits were determined from 950 to 1100 °C. With increasing temperature, the deposition rate increases, and the morphology changes from smooth to coarse, meanwhile, the concentration of silicon increases while that of boron decreases. The deposition process is controlled by chemical reactions, and the activation energy is 271 kJ/mol. At relatively lower temperature (below 1000 °C), the deposition process is dominated by formation of B4C. While at higher temperature (above 1000 °C), it is governed by formation of SiC. B4C and SiC disperse uniformly in the Si-B-C co-deposition system and form a dense network structure.

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    Porous Y2SiO5 Ceramic with Low Thermal Conductivity
    Duanyang Li, Meishuan Li
    J. Mater. Sci. Technol., 2012, 28 (9): 799-802. 
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    Porous Y2SiO5 ceramic was fabricated by freeze casting with tert-butyl alcohol as solvent. The porous Y2SiO5 ceramic possessed long straight pore structure. With decreasing solid loading from 20 to 10 vol.%, the porosity of the Y2SiO5 ceramic increased linearly from 45% to 72%, while the compressive strength declined from 23.2 to 3.1 MPa. The thermal conductivity of Y2SiO5 decreased from 1.34 W/mK for the dense bulk to 0.05 W/mK for the porous body with a porosity of 57%.

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    Iron and Steel
    Mechanism of Residual Stress Reduction in Low Alloy Steel by a Low Frequency Alternating Magnetic Treatment
    Yanli Song, Lin Hua
    J. Mater. Sci. Technol., 2012, 28 (9): 803-808. 
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    Residual stress reduction in low alloy steel by a low frequency alternating magnetic treatment and its mechanism were investigated. Experimental results revealed that average stress reductions of 20%-24% were obtained in the welded samples. Moreover, compared with the zones with lower initial stress levels, more remarkable stress reductions were obtained in the stress concentration zones. The microstructures and magnetic domains were observed by scanning electron microscopy (SEM) and atomic force microscopy (AFM). Based on the analysis of the microstructure and magnetic domain changes, the mechanism of stress reduction by the magnetic treatment has been concluded: (1) the magneto-plastic deformations mainly due to the more uniform redistribution of dislocations are the fundamental cause of stress relaxation; and (2) surface topography is also proved to affect the magnetic treatment results to some degree by influencing magnetic domains.

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    Berberine as an Environmental-Friendly Inhibitor for Hot-Dip Coated Steels in Diluted Hydrochloric Acid
    Hong Ju, Yulin Ju, Yan Li
    J. Mater. Sci. Technol., 2012, 28 (9): 809-816. 
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    The inhibition effect of an excellent environmental-friendly corrosion inhibitor|berberine on hot-dip coated steels in the diluted HCl has been investigated by using quantum chemistry analysis, mass-loss tests, electrochemical measurements and scanning electron microscopy (SEM) observation. Calculation results show that berberine has a nearly planar structure with a number of active centers. The value of Mulliken charge, and the distribution of the highest occupied molecular orbital (HOMO) and the lower unoccupied molecular orbital (LUMO) imply that berberine has a good ability of electron exchange with metal surface. The test results indicate that inhibition efficiency (IE%) increases with the inhibitor concentration and the highest IE can reach 99%. Adsorption of berberine on the coating surface follows Langmuir adsorption isotherm with a single molecular layer by chemisorption.

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    Materials for Sustainable Energy
    Influence of Nb5+ Doping on Structure and Electrochemical Properties of Spinel Li1.02Mn2O4
    Jianzhong Li, Yanwen Tian, Chaqing Xu
    J. Mater. Sci. Technol., 2012, 28 (9): 817-822. 
    Abstract   HTML   PDF

    The Li1.02NbxMn2-xO4 (x=0, 0.005, 0.01, 0.02, 0.04 and 0.1) materials were prepared by solid-state reaction method in which Li2CO3, electrolytic MnO2 and Nb2O5 were used as reactants. The influences of the Nb5+ doping on structure, morphology and electrochemical performance were systemically investigated by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), cyclic voltammetry (CV) and AC impedance. XRD test showed that the prepared samples had single spinel structure although there was impurity phase of LiNbO3 existing in  Li1.02NbxMn2-xO4 phase after Nb5+ doping. The doped materials with Nb5+ had smaller lattice parameters and crystal volume compared with pristine Li1.02Mn2O4. The endurance of overcharge was
    largely improved. In addition, the small amount of Nb5+ doping could increase the material conductivity.

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    Preparation of Nano-structured LiFexMn1-xPO4 (x=0, 0.2, 0.4) by Reflux Method and Research on the Influences of Fe(II) Substitution
    Zhao Yang, Hongming Yu, Chunyang Wu, Gaoshao Cao, Jian Xie, Xinbing Zhao
    J. Mater. Sci. Technol., 2012, 28 (9): 823-827. 
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    Nano structured LiFexMn1-xPO4 (x=0, 0.2, 0.4) materials were successfully prepared by one-step reflux method in a water/PEG400 mixed solvent, and were coated by carbon using glucose as the precursor. The materials were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy  (FESEM) and transmission electron microscopy (TEM). The electrochemical properties of the materials were investigated by galvanostatic cycling, cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). It was found that the materials consisted of nanorods with a diameter of 50 nm and a length of 500 nm. Galvanostatic cycling showed that the capacity of LiMnPO4 could be largely increased by Fe2+ substitution. At a current rate of C/20, the capacity of the three samples (x=0, 0.2, 0.4) were 47, 107 and 150 mA·h·g-1, respectively. CV result showed that the Fe2+ substitution could decrease the polarization during charging/discharging, accelerating the electrochemical process. EIS result showed that the Fe2+ substitution could decrease the charge transfer resistance between the electrode and electrolyte, as well as increase the Li-ion diffusion coefficient in the bulk material, resulting in an improved electrochemical performance.

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    Cobalt-free Composite Ba0.5Sr0.5Fe0.9Ni0.1O3-δ-Ce0.8Sm0.2O2-δ as Cathode for Intermediate-Temperature Solid Oxide Fuel Cell
    Xiangfeng Chu, Feng Liu,Weichang Zhu, Yongping Dong, Mingfu Ye, Wenqi Sun
    J. Mater. Sci. Technol., 2012, 28 (9): 828-832. 
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    New cobalt-free composites consisting of Ba0.5Sr0.5Fe0.9Ni0.1O3-δ(BSFN) and Ce0.8Sm0.2O2-δ (SDC) were investigated as possible cathode materials for intermediate-temperature solid oxide fuel cell (IT-SOFC). BSFN, which was synthesized by auto ignition process, was chemically compatible with SDC up to 1100 °C as indicated by X-ray diffraction analysis. The electrical conductivity of BSFN reached the maximum value of 57 S·cm-1 at 450 °C. The thermal expansion coefficient (TEC) value of BSFN was 30.9×10-6 K-1, much higher than that of typical electrolytes. The electrochemical behavior of the composites was analyzed via electrochemical impedance spectroscopy with symmetrical cells BSFN-SDC/SDC/BSFN-SDC. The area specific interfacial polarization resistance (ASR) decreased with increasing SDC content of the composite. The area specific interfacial polarization resistance (ASR) at 700 °C is only 0.49, 0.34 and 0.31 ­Ω·cm2 when 30, 40, and 50 wt% SDC was cooperated to BSFN, respectively. These results suggest that BSFN-SDC is a possible
    candidate for IT-SOFC cathode.

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    Mechanical and Functional Properties of Materials
    Interactive Effect of Grain Orientation and Grain Size on Magnetic Properties of Fe-78 wt% Ni Ribbons
    Nan Wang, Ruining Yang, Wenjing Yao, Jinfeng Xu, Xixing Wen
    J. Mater. Sci. Technol., 2012, 28 (9): 833-836. 
    Abstract   HTML   PDF

    Fe-78 wt% Ni ribbons were prepared by the melt spinning technique and the interactive contribution of the grain size and grain orientation on the magnetic properties was examined. Heat treatment at 673 K for 1 h followed by furnace cooling was performed to show the annealing impact. At three wheel speeds
    of 10, 20, and 30 m/s, the saturation magnetization nearly does not change. High wheel speed and heat treatment are inclined to promote the growth of <001> grains. Although the <001> orientation is not the easy axis of magnetization, the improvement of the texture in this direction makes the coercivity decrease, which counteracts the inverse effect of the grain size at high wheel speed. It indicates that for preparing soft magnetic ribbons, the interactive contribution of grain orientation variation and the grain size should be considered.

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    Effect of Carbon Addition on Microstructure and Properties of WC-Co Cemented Carbides
    Chongbin Wei, Xiaoyan Song, Jun Fu, Xiaosen Lv, Haibin Wang, Yang Gao, Shixian Zhao, Xuemei Liu
    J. Mater. Sci. Technol., 2012, 28 (9): 837-843. 
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    Based on a unique method to synthesize WC-Co composite powder by in-situ reactions of metal oxides and carbon, the effects of the carbon addition in the initial powders on the phase constitution, microstructure and mechanical properties of the cemented carbides were investigated. It is found that with a suitable carbon addition the pure phase constitution can be obtained in the sintered bulk from the composite powder. The mechanical properties of the cemented carbides depend on the phase constitution and the WC grain structure. To obtain the excellent properties of the WC-Co bulk, it is important to obtain the pure phase constitution from the appropriate carbon addition in the initial powders and a suitable grain size.

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    Effect of Ni Content on Mechanical Properties and Corrosion Behavior of Al/Sn-9Zn-xNi/Cu Joints
    M.L. Huang, N. Kang, Q. Zhou, Y.Z. Huang
    J. Mater. Sci. Technol., 2012, 28 (9): 844-852. 
    Abstract   HTML   PDF

    The effects of Ni content on the microstructure and the wetting behavior of Sn-9Zn-xNi solders on Al and Cu substrates, as well as the mechanical properties and electrochemical corrosion behavior of Al/Sn-9Zn-xNi/Cu solder joints, were investigated. The microstructure of Sn-9Zn-xNi revealed that tiny Zn and coarsened Ni5Zn21 phases dispersed in the β-Sn matrix. The wettability of Sn-9Zn-xNi solders on Al substrate was much better than that on Cu substrate. With increasing Ni content, the wettability on Cu substrate was slightly improved but became worse on Al substrate. In the Al/Sn-9Zn-xNi/Cu joints, an Al4.2 Cu3.2Zn0.7 intermetallic compound (IMC) layer formed at the Sn-9Zn-xNi/Cu interfaces, while an Al{Zn{Sn solid solution layer formed at the Sn-9Zn-xNi/Al interface. The mixed compounds of Ni3Sn4 and Al3Ni dispersed in the solder matrix and coarsened with increasing Ni content, thus leading to a reduction in shear strength of the Al/Sn-9Zn-xNi/Cu joints. Al particles were segregated at both interfaces in the solder joints. The corrosion potentials of
    Sn-9Zn-xNi solders continuously increased with increasing Ni content. The Al/Sn-9Zn-0.25Ni/Cu joint was found to have the best electrochemical corrosion resistance in 5% NaCl solution.

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    Regular Papers
    Chemical Compositions, Microstructure and Mechanical Properties of Roll Core used Ductile Iron in Centrifugal Casting Composite Rolls
    Yunlong Bai,Yikun Luan, Nannan Song, Xiuhong Kang, Dianzhong Li, Yiyi Li
    J. Mater. Sci. Technol., 2012, 28 (9): 853-858. 
    Abstract   HTML   PDF

    The industrial manufacture processes of three kinds of roll core used ductile irons have been investigated via systematical experiments. Effects of the ratio of C/Si, pig iron, nodularizer and alloying method on the microstructure and mechanical properties of the heavy section ductile iron have been analyzed. It has been found that when treated with RE-Mg plus Sb, high quality nodular castings can be produced even if much anti spheroidizing alloy elements are included in the pig iron. The alloy element Sb played an important role in the control of graphite morphology.

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    Effect of Substrate Wettability and Surface Structure on Nucleation of Crystal
    Ying Zhang, Meng Wang, Xin Lin, Weidong Huang
    J. Mater. Sci. Technol., 2012, 28 (9): 859-864. 
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    The heterogeneous nucleation behaviors of NH4Cl crystal on rough aluminum substrate surface immerged in NH4Cl-H2O solution were experimentally analyzed, and the influence mechanism of the micro/nano-scale surface structures on heterogeneous nucleation was investigated. It has been shown that wettability and nucleation are affected by substrate surface condition. The intrinsic wetting properties between nucleus and substrate surface, and the surface structure of certain geometrical scales, both impose effects on the heterogeneous nucleation properties. For a nucleus-wetting substrate surface, heterogeneous nucleation is promoted by a higher complexity of the surface morphology; but for a nucleus-nonwetting substrate surface, heterogeneous nucleation is inhibited by a higher complexity of the surface morphology.

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ISSN: 1005-0302
CN: 21-1315/TG
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