Started in 1985 Semimonthly
ISSN 1005-0302
CN 21-1315/TG
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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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      10 October 2015, Volume 31 Issue 10 Previous Issue    Next Issue
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    Orginal Article
    Defects-Driven Ferromagnetism in Undoped Dilute Magnetic Oxides: A Review
    Shuai Ning, Peng Zhan, Qian Xie, Weipeng Wang, Zhengjun Zhang
    J. Mater. Sci. Technol., 2015, 31 (10): 969-978.  DOI: 10.1016/j.jmst.2015.08.011
    Abstract   HTML   PDF
    In the past several decades, dilute magnetic semiconductors, particularly the dilute magnetic oxides have evolved into an important branch of materials science due to their potential application in spintronic devices combining of properties of semiconductors and ferromagnets. In spite of a major effort devoted to the mechanism of ferromagnetism with a high Curie temperature in these materials, it still remains the most controversial research topic, especially given the unexpected d0 ferromagnetism in a series of undoped wide-band-gap oxides films or nanostructures. Recently, an abundance of research has shown the critical role of various defects in the origin and control of spontaneous magnetic ordering, but contradicting views from intertwined theoretical calculations and experiments require more in-depth systematic research. In our previous work, considerable efforts have been focused on two major oxides, i.e. ZnO and ZrO2. This review will present a summary of current experimental status of this defect-driven ferromagnetism in dilute magnetic oxides (DMOs).
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    Spin States of 2D Nanocomposites of Ni and V Nanoclusters on Hexagonal h-BN, BC3 and Graphene
    P. Avramov, A.A. Kuzubov, S. Sakai, S. Entani, H. Naramoto, N. Eliseeva
    J. Mater. Sci. Technol., 2015, 31 (10): 979-985.  DOI: 10.1016/j.jmst.2015.08.008
    Abstract   HTML   PDF
    Atomic and electronic structures of adsorbed nickel and vanadium atoms and nanoclusters (Nin and Vn, n=1-10) on hexagonal h-BN and BC3 lattices were studied using DFT PBE/PBC/PW (Perdew-Burke-Ernzerhof potential of density functional theory/periodic boundary conditions/plane wave basis set) technique. For the sake of comparison the structure and properties of the same nanoclusters deposited on pristine graphene were calculated as well. It was found that for all types of supports an increase of n from 1 to 10 leaded to decrease of coordination types from η6 to η2 and η1. The h-BN- and BC3-based nanocomposites were characterized by high (up to 18µ for Ni10/BC3) magnetic moments of the nanoclusters and featured by positive binding energies. The graphene-based nanocomposites revealed energetic stability and, in general, lower magnetic moments per unit cell. The direct potential energy barriers for migration of Ni η2/η2 and η6/η6 types of dimers on graphene were low (10.9-28.9kJ/mol) with high reverse barriers for η6/η6 dimers, which favored dynamically equilibrated Ni clusterization on graphene.
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    Comparative Study of Antioxidant and Catalytic Activity of Silver and Gold Nanoparticles Synthesized From Costus pictus Leaf Extract
    Jayachandra Reddy Nakkala, Ekta Bhagat, Kitlangki Suchiang, Sudha Rani Sadras
    J. Mater. Sci. Technol., 2015, 31 (10): 986-994.  DOI: 10.1016/j.jmst.2015.07.002
    Abstract   HTML   PDF
    Biological synthesis of silver and gold nanoparticles using Costus pictus leaf extract (CPLE) and their potential in vitro antioxidant and catalytic activities were reported here. Formation of Costus pictus silver (CPAgNPs) and gold (CPAuNPs) nanoparticles was confirmed by UV-visible spectroscopy and their spherical shape by scanning electron microscopy. The synthesized nanoparticles gave strong signals for silver and gold in energy dispersive X-ray spectroscopy. The CPAgNPs and CPAuNPs had an average size of 46.7 and 37.2nm, respectively, as determined by dynamic light scattering particle size analyzer. Fourier transform infrared spectroscopy (FTIR) analysis indicated involvement of amine and carbonyl groups in the formation of CPAgNPs and CPAuNPs. Thermal stability of synthesized nanoparticles was assessed by thermogravimetric analysis-differential scanning calorimetry. CPAgNPs, CPAuNPs and CPLE exhibited tremendous antioxidant activity when being assessed by various in vitro assays, and their activity was comparable to standard antioxidants. CPAgNPs, CPAuNPs and CPLE also caused degradation of dyes like methylene blue and methyl red. While CPAgNPs, CPAuNPs and CPLE caused respective 85%, 42% and 30% degradation of methylene blue, they showed less activity against methyl red. These observations signify that such green methods open up new avenues in nanobiotechnology for the synthesis of nanoparticles with extensive industrial and biomedical applications.
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    Characterization of Mo-Si-B Nanocomposite Powders Produced Using Mechanical Alloying and Powder Heat Treatment
    Bin Li, Guojun Zhang, Feng Jiang, Shuai Ren, Gang Liu, Jun Sun
    J. Mater. Sci. Technol., 2015, 31 (10): 995-1000.  DOI: 10.1016/j.jmst.2015.07.007
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    Mo-Si-B nanocomposite powders with a composition of Mo-12Si-8.5B (in at.%) were processed using mechanical alloying under milling conditions for different milling time and powder-to-ball ratios. The Mo-12Si-8.5B alloy, which consists of α-Mo and intermetallic Mo3Si and T2 phases, was also synthesized by hot-pressed sintering the mechanically alloyed powders under a pressure of 50MPa at 1600°C. The results demonstrated that the sizes and morphologies of the powder particles became gradually refined and uniform by both increasing the milling time and decreasing the powder-to-ball ratio. After 15h of milling, the powders were completely homogenized at the 1:10 and the 1:15 powder-to-ball weight ratios, and the homogenization was accelerated to rapidly stabilize the milling process because of their high milling energy. Annealing the Mo-Si-B milled powders could promote the growth of the intermetallic Mo3Si and the T2 phases, which formed even after low-temperature annealing at 900°C. Increasing the annealing temperature only improved the crystallinity of various phases. When the milled and annealed powders were hot-pressed sintered, the Mo-Si-B alloy exhibited a fine-grained microstructure, where the intermetallics Mo3Si and T2 were distributed in a continuous α-Mo matrix.
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    Effect of Powder Particle Shape on the Properties of In Situ Ti-TiB Composite Materials Produced by Selective Laser Melting
    Hooyar Attar, Konda G. Prashanth, Lai-Chang Zhang, Mariana Calin, Ilya V. Okulov, Sergio Scudino, Chao Yang, Jü, rgen Eckert
    J. Mater. Sci. Technol., 2015, 31 (10): 1001-1005.  DOI: 10.1016/j.jmst.2015.08.007
    Abstract   HTML   PDF
    This work studied the preparation of starting powder mixture influenced by milling time and its effect on the particle morphology (especially the shape) and, consequently, density and compression properties of in situ Ti-TiB composite materials produced by selective laser melting (SLM) technology. Starting powder composite system was prepared by mixing 95 wt% commercially pure titanium (CP-Ti) and 5 wt% titanium diboride (TiB2) powders and subsequently milled for two different times (i.e. 2h and 4h). The milled powder mixtures after 2h and 4h show nearly spherical and irregular shape, respectively. Subsequently, the resultant Ti-5 wt% TiB2 powder mixtures were used for SLM processing. Scanning electron microscopy image of the SLM-processed Ti-TiB composite samples show needle-shape TiB phase distributed across the Ti matrix, which is the product of an in-situ chemical reaction between Ti and TiB2 during SLM. The Ti-TiB composite samples prepared from 2h and 4h milled Ti-TiB2 powders show different relative densities of 99.5% and 95.1%, respectively. Also, the compression properties such as ultimate strength and compression strain for the 99.5% dense composite samples is 1421MPa and 17.8%, respectively, which are superior to those (883MPa and 5.5%, respectively) for the 95.1% dense sample. The results indicate that once Ti and TiB2 powders are connected firmly to each other and powder mixture of nearly spherical shape is obtained, there is no additional benefit in increasing the milling time and, instead, it has a negative effect on the density (i.e. increasing porosity level) of the Ti-TiB composite materials and their mechanical properties.
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    Reaction Mechanism and Thermal Insulation Property of Al-deposited 7YSZ Thermal Barrier Coating
    Xiaofeng Zhang, Kesong Zhou, Wei Xu, Jinbing Song, Chunming Deng, Min Liu
    J. Mater. Sci. Technol., 2015, 31 (10): 1006-1010.  DOI: 10.1016/j.jmst.2015.06.002
    Abstract   HTML   PDF
    To increase the performance and efficiency of thermal barrier coating (TBC), it is important to improve the thermal insulation property. In this work, a columnar Al film was deposited at the top of 7 wt% yttria-stabilized zirconia (7YSZ) TBC by magnetron sputtering. A vacuum heat treatment was then carried out to improve the insulation property of Al-deposited TBC. Reaction mechanism of Al-ZrO2 system in Al-deposited TBC was studied by differential thermal analysis (DTA). The phase structures of the as-sprayed TBC, the Al-deposited and vacuum-treated TBC were characterized. The microstructure evolution of Al-deposited TBC was illustrated after vacuum heat treatment. And the insulation property of the as-sprayed TBC and treated TBC was compared. The results show that a multi-scaled layer, consisting of micron/nano structured α-Al2O3 and Al3Zr grain was in situ synthesized at the top of 7YSZ coating via vacuum heat treatment. The TBC with the multi-scaled overlay has better insulation property than the as-sprayed TBC.
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    Microstructure Characterization of the Fusion Zone of an Alloy 600-82 Weld Joint
    Cheng Ma, Jinna Mei, Qunjia Peng, Ping Deng, En-Hou Han, Wei Ke
    J. Mater. Sci. Technol., 2015, 31 (10): 1011-1017.  DOI: 10.1016/j.jmst.2015.08.013
    Abstract   HTML   PDF
    Characterization of the microstructure of the fusion zone of an Alloy 600-82 weld joint was conducted, with focus on the weld residual strain distribution and the comparison of the microstructure of heat affected zone (HAZ) with that of cold worked alloy. Peak of the residual strain was observed to approach to the fusion boundary in HAZ while the strain increased from the top of the weld to the root. Strain distribution in the HAZ was found to be concentrated adjacent to grain boundaries (GBs), with a peak of approximately three times of that in grain. Further, triple junctions of the GB appear to cause a higher strain concentration than single GBs. The microstructure of HAZ consists of partially tangled dislocations, which is different from slip bands of high density dislocations in cold worked alloy. This may cause a relatively higher intergranular cracking resistance of HAZ due to the difficulty in transferring tangled dislocations to GB in HAZ under deformation.
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    Cell Wall Buckling Mediated Energy Absorption in Lotus-type Porous Copper
    Weidong Li, Haoling Jia, Chao Pu, Xinhua Liu, Jianxin Xie
    J. Mater. Sci. Technol., 2015, 31 (10): 1018-1026.  DOI: 10.1016/j.jmst.2015.08.010
    Abstract   HTML   PDF
    The energy absorption characteristics of the lotus-type porous coppers at the strain rate of 10-3s-1 to ~2400s-1 were systematically investigated. Depending on the relative density and loading rate, the energy absorption capability of the tested samples varied from ~20 to ~85MJm-3, while the energy absorption efficiency fluctuated around ~0.6. An energy absorption efficiency curve based approach was proposed for unambiguous identification of the plateau regime, which gave an extension of ~0.50 strain range for the presently investigated porous coppers. With detailed observations of cell wall morphologies at various deformation stages, it was suggested that buckling of cell walls was the dominant mechanism mediating the energy absorption in lotus-type porous coppers.
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    Microstructural Characterization and Mechanical Properties of VB2/A390 Composite Alloy
    Xiaoli Cui, Yuying Wu, Xiangfa Liu
    J. Mater. Sci. Technol., 2015, 31 (10): 1027-1033.  DOI: 10.1016/j.jmst.2015.08.004
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    In this work, we make the best use of the vanadium element; a series of Al-V-B alloys and VB2/A390 composite alloys were fabricated. For Al-10V-6B alloy, the grain size of VB2 can be controlled within about 1µm and is distributed uniformly in the Al matrix. Further, it can be found that VB2 promises to be a useful reinforcement particle for piston alloy. The addition of VB2 can improve the mechanical properties of the A390 composite alloys significantly. The results show that with 1% VB2 addition, A390 composite alloy exhibits the best performance. Compared with the A390 alloy, the coefficient of thermal expansion is 13.2×10-6K-1, which decreased by 12.6%; the average Brinell hardness can reach 156.5HB, wear weight loss decreased by 28.9% and ultimate tensile strength at 25°C (UTS25°C) can reach 355MPa, which increased by 36.5%.
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    Microstructure and Property of AlN Joint Brazed with Au-Pd-Co-Ni-V Brazing Filler
    Bo Chen, Huaping Xiong, Yaoyong Cheng, Wei Mao, Shibiao Wu
    J. Mater. Sci. Technol., 2015, 31 (10): 1034-1038.  DOI: 10.1016/j.jmst.2014.11.026
    Abstract   HTML   PDF
    An Au-Pd-Co-Ni-V brazing alloy was designed for AlN ceramic joining. Its wettability on AlN was studied with the sessile drop method. The results showed that the contact angle was decreased gradually with increasing temperature and the prolonging of holding time. Sound AlN/AlN joints were achieved with the brazing alloy at 1170 °C for 10 min. The microstructure of the AlN/AlN joints was examined by scanning electron microscopy (SEM). It was found that element V played the active role in the interfacial reaction between the ceramic and the brazing alloy. V reacted with N decomposed from AlN, resulted in the formation of V-N compound. Based on the energy-dispersive spectroscopy (EDS) and X-ray diffraction (XRD) analysis results, the V-N reaction product was verified as V2N. The overall reaction during the brazing process can be described by the following equation: 2V + AlN + 2Pd = V2N + Pd2Al. The AlN/AlN joints brazed with the Au-Pd-Co-Ni-V brazing alloy exhibited three-point bend strength of 162.7 MPa at room temperature, and under the bend test the fracture of the joint occurred at the AlN ceramic substrate.
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    Influence of Ethanolamine on Corrosion of Alloy 690 in Simulated Secondary Water
    Jiazhen Wang, Jianqiu Wang
    J. Mater. Sci. Technol., 2015, 31 (10): 1039-1046.  DOI: 10.1016/j.jmst.2014.09.022
    Abstract   HTML   PDF
    Effect of ethanolamine (ETA) on Alloy 690 in simulated pressurized water reactor (PWR) secondary cooling water was studied by electrochemical impedance spectroscopy (EIS), potentiodynamic polarization, atomic force microscopy (AFM), Fourier transform infrared spectroscopy-attenuated total reflectance (FTIR-ATR), X-ray photoelectron spectrometer (XPS) and time of flight secondary ion mass spectrometry (ToF-SIMS). The results show that moderate addition of ETA can enhance the corrosion resistance of Alloy 690 in high-temperature pressurized water and the optimum additive value is 2 mg/L. The addition of ETA contributes to the formation of oxide rather than hydroxide in the film on the surface of Alloy 690. The corrosion resistance of Alloy 690 at 320 °C with the addition of ETA is better than that at 280 °C.
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    Corrosion Evolution of Low Alloy Steel in Deaerated Bicarbonate Solutions
    Yunfei Lu, Junhua Dong, Wei Ke
    J. Mater. Sci. Technol., 2015, 31 (10): 1047-1058.  DOI: 10.1016/j.jmst.2014.10.013
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    Corrosion evolution during immersion tests (up to 43 days) of NiCu steel in deaerated 0.1 mol/L bicarbonate solutions was investigated by electrochemical measurements, scanning electron microscopy (SEM) and X-ray diffraction (XRD). Results show that NiCu steel transformed from the anodic dissolution in the early stage of immersion to a metastable passive state in the final stage as the open-circuit potential value shifted positively, which was aroused by the precipitation of corrosion products. This process was mainly promoted by the trace amount of oxygen. Simultaneously, dominant cathodic reaction transformed from the hydrogen evolution in early stage to reduction processes of corrosion products in later stages. Possible corrosion processes were discussed with the assistance of a corresponding Pourbaix diagram.
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    Effect of Anodization Parameters on Morphology and Photocatalysis Properties of TiO2 Nanotube Arrays
    Lianjie Qin, Qijing Chen, Ruijun Lan, Runqian Jiang, Xiao Quan, Bin Xu, Feng Zhang, Yongmin Jia
    J. Mater. Sci. Technol., 2015, 31 (10): 1059-1064.  DOI: 10.1016/j.jmst.2015.07.012
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    Highly ordered TiO2 nanotube arrays were fabricated via electrochemical anodization of high purity Ti foil in fluoride-containing electrolyte. The effects of applied anodization potential, anodization time on the formation of TiO2 nanotube arrays and the photocatalytic degradation of methylene blue (MB) were discussed. The TiO2 nanotube arrays calcined at 500°C for 2h show pure anatase phase. The pore diameters of TiO2 nanotube arrays can be adjusted from 30 to 90nm using a different anodization voltage. Anodization time mainly influenced TiO2 tube length, and by increasing the anodization time, the nanotube length became longer gradually. When the anodization potential was 40V, the average growth rate of TiO2 nanotube was about 4.17µm/h. Both anodization potential and time had important effects on the photocatalytic efficiency. The TiO2 nanotube arrays obtained at anodization potential of 40V for 1h showed the best photocatalytic degradation ratio of MB.
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ISSN: 1005-0302
CN: 21-1315/TG
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