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.

  Current Issue
      28 March 2010, Volume 26 Issue 3 Previous Issue    Next Issue
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    Thin Film and Coatings
    Influence of the Cd/S Molar Ratio on the Optical and Structural Properties of Nanocrystalline CdS Thin Films
    M. Thambidurai N. Murugan N. Muthukumarasamy S. Agilan S. Vasantha R. Balasundaraprabhu
    J. Mater. Sci. Technol., 2010, 26 (3): 193-199. 
    Abstract   HTML   PDF (689KB)

    Nanocrystalline CdS thin films have been deposited using precursors with different thiourea concentration onto glass substrates by sol-gel spin coating method. The crystalline nature of the films has been observed to be strongly dependent on thiourea concentration and annealing temperature. The CdS films are found to be nanocrystalline in nature with hexagonal structure. The grain size is found to be in the range of 7.6 to 11.5 nm depending on the thiourea concentration and annealing temperature. The high resolution transmission electron microscopy (HRTEM) results of the CdS films prepared using cadmium to thiourea molar ratio of 0.3:0.3 indicate the formation of nanocrystalline CdS with grain size of 5 nm. Fourier transform infrared (FTIR) analysis shows the absorption bands corresponding to Cd and S. The optical study carried out to determine the band gap of the nanostructured CdS thin films shows a strong blue shift. The band gap energy has been observed to lie in the range of 3.97 to 3.62 eV following closely the quantum confinement dependence of energy on crystallite radius. The dependence of band gap of the CdS films on the annealing temperature and thiourea concentration has also been studied. The photoluminescence (PL) spectra display two main emission peaks corresponding to the blue and green emissions of CdS.

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    Role of Wetting Front in Dewetting of Liquid Solder Drop on Cu Thin Films
    Wei Liu Lei Zhang J.K. Shang
    J. Mater. Sci. Technol., 2010, 26 (3): 200-205. 
    Abstract   HTML   PDF (858KB)

    The thermodynamic conditions for dewetting of a liquid solder drop on copper thin films were examined under a hot-stage optical microscope in a flowing protective atmosphere. Dewetting of liquid solder was found to depend strongly on the copper film thickness and preceded by spalling of Cu6Sn5 intermetallic compounds. However, the loss of interfacial bonding by spalling was not sufficient to cause immediate dewetting of solder drops if the wetting tip was still strongly bonded to the copper film. By  introducing a pinning force on the wetting front, a sufficient condition was found from a force balance analysis for dewetting of the liquid solder drop, in general agreement with the experimental results.

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    Effect of Bi2Ti2O7 Seeding Layer on Capacitance-voltage Properties of Bi3:54Nd0:46Ti3O12 Films
    Huizhong Xu Liang Zhen Changhong Yang Zhuo Wang
    J. Mater. Sci. Technol., 2010, 26 (3): 206-210. 
    Abstract   HTML   PDF (607KB)

    Au/Bi3:54Nd0:46Ti3O12/Bi2Ti2O7/Si structure has been fabricated with a preferentially (111)-orientated Bi2Ti2O7 seeding layer as a ferroelectric gate of metal-ferroelectric-insulator ¯eld e®ect transistor. Bi3:54Nd0:46Ti3O12 and Bi3:54Nd0:46Ti3O12/Bi2Ti2O7 ¯lms are both well-crystallized when annealed at 680±C for 40 min, and have smooth, dense and crack-free surfaces. The width of memory window of the ferroelectric gate increases with increasing electric ¯eld applied to the Bi3:54Nd0:46Ti3O12 thin ¯lms. The width of memory window of Au/Bi3:54Nd0:46Ti3O12/Bi2Ti2O7/Si with seeding layer is relatively wider than that of Au/Bi3:54Nd0:46Ti3O12/Si at the same bias voltage, and the counterclockwise hysteresis curve of Au/Bi3:54Nd0:46Ti3O12/Bi2Ti2O7/Si is referred to as polarization type switching at di®erent voltages. Bi2Ti2O7 seeding layer plays an important role in alleviating the element interdi®usion between Bi3:54Nd0:46Ti3O12 and Si.

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    Effect of Temperature on the Synthesis of SiC Coating on Carbon Fibers by the Reaction of SiO with the Deposited Pyrolytic Carbon Layer
    Hejun Li Haibo Ouyang Lehua Qi Yulei Zhang Zhengjia Li Jianfeng Wei
    J. Mater. Sci. Technol., 2010, 26 (3): 211-216. 
    Abstract   HTML   PDF (700KB)

    The influence of reaction temperature on the preparation of SiC coating on carbon fibers by the reaction of silicon monoxide with the deposited pyrolytic carbon (PyC) layer has been discussed. With rising reaction temperature, the thickness of SiC layer increases and the SiC grain is coarsening. The apparent activation energy for the synthesis of SiC layer is about 103.3 kJ/mol. The oxidation resistance of carbon fiber can be improved by the SiC/PyC layers significantly. The initial oxidation temperature of the SiC/PyC coated carbon fiber is about 300°C higher than that of the uncoated carbon fiber. The oxidation of the SiC/PyC coated carbon fiber is owing to the diffusion of oxygen through the cracks generated by the mismatch of thermal expansion.

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    Cyclic Corrosion Behavior of Pt/Ru-Modified Bond Coatings Exposed to NaCl Plus Water Vapor at 1050°C
    Yingxue Song H. Murakami Chungen Zhou
    J. Mater. Sci. Technol., 2010, 26 (3): 217-222. 
    Abstract   HTML   PDF (950KB)

    In the present investigation, Pt/Ru-modified bond coating consisted of 2 μm Pt+2 μm Ru was deposited on a nickel-based superalloy by electroplating method and followed by conventional Al pack cementation. The cyclic corrosion behavior of Pt/Ru-modified bond coating exposed to NaCl plus water vapor has been investigated under atmospheric pressure at 1050°C. The result shows that the cyclic corrosion life of Pt/Ru-modified bond coating is longer than that of the conventional Pt-modified aluminide coating in the presence of NaCl plus water vapor. The addition of Ru makes the coating possess the increased strength and suppress the rumpling behavior. The absence of rumpling may be responsible for the improved corrosion resistance of Pt/Ru-modified aluminide coating.

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    Mechanical and Functional Properties of Materials
    Development and Characterization of Sol-gel Derived Al Doped ZnO/p-Si Photodiode
    Babita Gupta Anubha Jain R.M. Mehra
    J. Mater. Sci. Technol., 2010, 26 (3): 223-227. 
    Abstract   HTML   PDF (584KB)

    The effect of Al doping on the J-V characteristics sol-gel derived of ZnO/p-Si photodiodes was investigated. The resistivity of Si was 0.1Ω·cm. ZnO films annealed at 500°C were of the best quality. To investigate the spectral response of the photodiodes, the J-V characteristics were measured under different monochromatic lights at wavelength 420, 530, 570 and 630 nm. The diodes exhibit strong responsivity in the blue region at 420 nm. The responsivity is 0.22 A/W for Al doped (0.8 wt pct) photodiode, whereas for the undoped
    photodiode, it was much lower. An estimate of the responsivity as a function of wavelength has been made in terms of the width of depletion region of photodiodes.

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    Synthesis and Thermal Behavior of New Precursors for B-C-N Ceramics
    Shaohua Dong Weijian Han Yongming Luo Tong Zhao Caihong Xu
    J. Mater. Sci. Technol., 2010, 26 (3): 228-233. 
    Abstract   HTML   PDF (571KB)

    Three new borazine derivatives, 2,4,6-tri(allylamino)borazine (CH2=CHCH2NHBNH)3 (1), 2,4,6-tri(3-ethynylanilino)borazine (CH´CC6H4NHBNH)3 (2), and 2,4,6-tri(4-propargyl oxyanilino)borazine (CH´CCH2OC6H4NHBNH)3 (3) were synthesized by reaction of 2,4,6-trichloro-borazine Cl3B3N3H3 (TCB) with corresponding primary amines, respectively. Their thermal behavior was studied by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). These molecules were easily crosslinked via thermal
    polymerization of reactive ethynyl or vinyl groups. The pyrolytic residues of borazines were investigated by X-ray photoelectron spectroscopy (XPS), powder X-ray diffraction (XRD), and scanning electron microscopy (SEM). The analytic results indicated that B-C-N ceramics were formed upon pyrolysis of the borazines under an inert atmosphere.

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    Magnetocaloric and Colossal Magnetoresistance Effect in Layered Perovskite La1:4Sr 1:6Mn2O7
    Li'an Han Changle Chen
    J. Mater. Sci. Technol., 2010, 26 (3): 234-236. 
    Abstract   HTML   PDF (315KB)

    Magnetocaloric and colossal magnetoresistance effects of the layered perovskite La1:4Sr1:6Mn2O7 compound have been studied. A broad peak of magnetic entropy change (-ΔSM) is found above the Curie temperature (TC=120 K), which can be associated with the existence of two-dimensional short range ferromagnetic order. Additionally, the curvilinear shape of -ΔSM for layered perovskite is quite different from that of the Ln1-xAxMnO3 probably arising from magnetocrystalline anisotropy. At the same time, a wide peak of colossal magnetoresitance effect near TC is found in the layered provskite La1:4Sr1:6Mn2O7.

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    Regular Papers
    Dispersoid Formation and Recrystallization Behavior in an Al-Mg-Si-Mn Alloy
    Rong Hu Tomo Ogura Hiroyasu Tezuka Tatsuo Sato Qing Liu
    J. Mater. Sci. Technol., 2010, 26 (3): 237-243. 
    Abstract   HTML   PDF (1331KB)

    The nucleation and precipitation of Mn-containing dispersoids in an Al-Mg-Si-Mn alloy (6082) have been studied by optical microscopy, EPMA (electron probe microanalysis) and TEM (transmission electron microscopy). The influence of Mn-containing dispersoids on the recrystallization behavior was also investigated. The size and distribution of dispersoids were strongly affected by both the homogenization process and the alloying element distribution formed in the direct chill cast procedure. The Mn-containing dispersoids were observed to nucleate preferentially on the β'-Mg2Si phase and to be aligned along the <100> direction of the matrix. After cold deformation, the morphology of dispersoids greatly influences the recrystallization and grain growth behavior in the annealing process.

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    Influence of Mg Addition on Graphite Particle Distribution in the Al Alloy Matrix Composites
    Zhengang Liu Guoyin Zu Hongjie Luo Yihan Liu Guangchun Yao
    J. Mater. Sci. Technol., 2010, 26 (3): 244-250. 
    Abstract   HTML   PDF (843KB)

    Al alloy matrix composites reinforced with copper-coated graphite particle have been prepared by melt stirring process in this work. The effect of the addition of Mg on distribution of the graphite particles has been investigated. Scanning electron microscopy (SEM) was used to observe the micro-morphology of Al alloy matrix composites reinforced with graphite particles. Meanwhile, the content of graphite was analyzed in the different position of casting by dissolution method and the mechanical properties of the composites were detected. The results show that the content of graphite increase with increasing Mg content; the graphite particles distribute uniformly in the particle reinforced metal matrix composites (PMMC) with 0.6 wt pct Mg; however, the agglomeration of the graphite particles is observed obviously in the matrix when Mg content is more than 1.0 wt pct. In addition, the proper Mg addition amount is beneficial to enhance the mechanical properties of the graphite particles reinforced Al alloy matrix composites and the abrasion resistance of the materials due to a reduce friction coefficient.

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    Effect of Different Surface Treatment Methods on the Friction and Wear Behavior of AISI 4140 Steel
    Mustafa Ulutan Osman N. Celik Hakan Gasan Umit Er
    J. Mater. Sci. Technol., 2010, 26 (3): 251-257. 
    Abstract   HTML   PDF (1449KB)

    In this study, the effects of various surface treatments on the friction and wear behavior of AISI 4140 steel have been evaluated. Sample surfaces of AISI 4140 steel were treated by quenching, carburizing, boronizing and plasma transferred arc (PTA) modification. The microstructural characteristics of surface treated steel samples were examined by optical microscopy and scanning electron microscopy (SEM). The mechanical properties of the samples including the surface roughness, microhardness, and abrasive and adhesive wear characteristics were also evaluated. Wear tests were applied by using a block-on-disc configuration under dry  sliding conditions. The wear behavior and friction characteristics of the samples were determined as a function of sliding distance. Each sample group was compared with the other sample groups, and it was observed that
    the carburized samples demonstrated the lowest weight losses; however, PTA-treated samples demonstrated the lowest coefficient of friction in comparison to the other sample groups at the same sliding distance.

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    Strain-induced Microstructure Refinement in a Tool Steel Subjected to Surface Mechanical Attrition Treatment
    Shoudan Lu Zhenbo Wang Ke Lu
    J. Mater. Sci. Technol., 2010, 26 (3): 258-263. 
    Abstract   HTML   PDF (726KB)

    A nanostructured surface layer has been fabricated on an AISI H13 tool steel by means of surface mechanical attrition treatment (SMAT). Strain-induced refinement processes of ferrite grains and carbide particles have been investigated by transmission electron microscopy (TEM) and scanning electron microscopy (SEM) in the SMAT surface layer. Grain refinement of ferrite is found to be dominated by dislocation activities and greatly facilitated by a large number of carbide particles at a depth >20μm. The comparisons with microstructure refinement processes in other SMAT ferrite steels indicate that a larger volume fraction of carbide particles with a lower shear strength is expected to facilitate the refinement process of ferrite grains.

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    Kinetics of Mild Steel Corrosion in Aqueous Acetic Acid Solutions
    S.K. Singh A.K. Mukherjee
    J. Mater. Sci. Technol., 2010, 26 (3): 264-269. 
    Abstract   HTML   PDF (749KB)

    The kinetics of mild steel corrosion in aqueous acetic acid solution has been investigated by weight loss and polarization techniques at 25, 35 and 45°C. The weight loss of mild steel at room temperature (25°C) has been found to be quite significant, indicating poor corrosion resistance in acetic acid. The maximum corrosion rate has been observed in 25% acetic acid solution at all three experimental temperatures. The decrease in corrosion rate after attaining a maximum value has been attributed to the deposition of corrosion product on the surface. Anodic polarization curves exhibit active behaviour at each concentration and temperature with a shift towards higher current density region and increased corrosion rates at higher temperatures. The cathodic polarization curves are almost identical irrespective either of the concentration of acetic acid or temperature. The results obtained by both the techniques are in good agreement, while the surface studies support the conclusions drawn from the weight loss method.

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    Preparation and Properties of a Novel Water Soluble Core Material
    Weiguo Jiang, Jiasheng Dong, Langhong Lou, Ming Liu, Zhuangqi Hu
    J. Mater. Sci. Technol., 2010, 26 (3): 270-275. 
    Abstract   HTML   PDF (572KB)

    A novel water-soluble core material composed of polyethylene glycol, sodium chloride, mica powder and plasticizer was prepared. The compressive strength, bend strength, hygroscopic coefficient and the material solubility in water were investigated. The results show that the compressive yield strength of the soluble core can reach 1 MPa and the highest compressive strength can reach 4 MPa, the bend strength is as high as 6.65 MPa, the hygroscopic coefficient is lower than 0.22%/month and the solubility of suitable core material is 35.7-55.75 g/(min·m2). The wax pattern with undercuts was prepared successfully by using the novel water-soluble core material.

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    Effect of Laser Welding on Properties of Dissimilar Joint of Al-Mg-Si and Al-Mn Aluminum Alloys
    C.C. Chang C.P. Chou S.N. Hsu G.Y. Hsiung J.R. Chen
    J. Mater. Sci. Technol., 2010, 26 (3): 276-282. 
    Abstract   HTML   PDF (1084KB)

    This study discusses the welding properties for the components of an aluminum-alloy ultra-high vacuum chamber and beam position monitor (BPM). The welding parameters include the modes of laser output (pulsed wave and continuous wave), welding speed, shield gas flow, welding bead structure, and focusing distance. The results showed that the welding defect rate of the pulsed wave type was larger than that of the continuous wave type. The crack in the welding bead reduced with decreasing welding speed. The fusion penetration of the welding bead was higher when the focusing distance was long enough to deepen into the welding material. Weld morphology during the experimental process revealed the proper flow of shield gas.The adaptability design of the welding bead structure in the preceding processes had more effect on overall welding structure and morphology.

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    Preparation, Properties and Application of C/C-SiC Composites Fabricated by Warm Compacted-in situ Reaction
    Peng Xiao Zhuan Li Zibing Zhu Xiang Xiong
    J. Mater. Sci. Technol., 2010, 26 (3): 283-288. 
    Abstract   HTML   PDF (909KB)

    Carbon fibre reinforced carbon and SiC dual matrices composites (C/C-SiC) show superior tribological properties, high thermal shock resistance and good abrasive resistance, and they are promising candidates for advanced brake and clutch systems. The microstructure, mechanical properties, friction and wear properties, and application of the C/C-SiC composites fabricated by warm compacted-in situ reaction were introduced. The results indicated that the composites were composed of 50-60 wt pct carbon, 2-10 wt pct residual silicon and 30-40 wt pct silicon carbide. The C/C-SiC brake composites exhibited good mechanical properties. The value of flexural strength and compressive strength could reach 160 and 112 MPa, respectively. The impact strength was about 2.5 kJ·m-2. The C/C-SiC brake composites showed excellent tribological performance,
    including high coefficient of friction (0.38), good abrasive resistance (1.10 μm/cycle) and brake steadily on dry condition. The tribological properties on wet condition could be mostly maintained. The silicon carbide matrix in C/C-SiC brake composites improved the wear resistance, and the graphite played the lubrication function, and right volume content of graphite was helpful to forming friction film to reduce the wear rate. These results showed that C/C-SiC composites fabricated by warm compacted-in situ reaction had excellent properties for use as brake materials.

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