Started in 1985 Semimonthly
ISSN 1005-0302
CN 21-1315/TG
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  Current Issue
      31 October 2010, Volume 26 Issue 10 Previous Issue    Next Issue
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    Thin Film and Coatings
    Effects of Current Frequency on the Microstructure and Wear Resistance of Ceramic Coatings Embedded with SiC Nano-particles Produced by Micro-arc Oxidation on AZ91D Magnesium Alloy
    Yue Yang Hua Wu
    J. Mater. Sci. Technol., 2010, 26 (10): 865-871. 
    Abstract   HTML   PDF (1208KB)
    To improve the surface wear resistance of the ceramic coating fabricated by micro-arc oxidation (MAO) on AZ91D magnesium alloy, ceramic coatings embedded with SiC nano-particles at different current frequency (500 Hz, 700 Hz, and 900 Hz) were produced during the MAO process. The morphology and phase composition of the coatings were investigated by scanning electron microscopy (SEM), field emission scanning electron microscopy (FESEM), and X-ray diffraction (XRD). The surface roughness of the coatings was characterized  by confocal laser scanning microscopy (CLSM). Simultaneously, the tribological properties of the composite coatings were evaluated by using a universal materials tester (UMT). The results shows that the wear resistance of the ceramic coatings with SiC nano-particles was improved significantly compared to the ceramic coatings without SiC nano-particles. Furthermore, the composite coating formed at current frequency 900 Hz showed the better wear resistance than the others.
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    ZnO:Al Films Prepared by Reactive Mid-frequency Magnetron Sputtering with Rotating Cathode
    Ruijiang Hong Shuhua Xu
    J. Mater. Sci. Technol., 2010, 26 (10): 872-877. 
    Abstract   HTML   PDF (632KB)
    Al-doped zinc oxide (ZnO:Al, AZO) films were deposited on glass substrates using a reactive mid-frequency (MF) magnetron sputtering process with rotating cathodes. The influence of deposition parameters on structural, electrical and optical properties of AZO fims is investigated. It is observed that the rotating magnetron targets exhibited a sputtered metallic surface over a wider range, and there is no re-deposition zone between the racetracks. The films deposited at static deposition mode demonstrate more homogenous in thickness and resistivity across the target surface compared with conventional rectangular targets. The films deposited under the proper conditions show a regular cone-shaped grain surface and densely packed columnar structure. The minimum resistivity of 3.16×10-4­  Ω·m was obtained for the film prepared at substrate temperature of  150°C, gas pressure of 640 MPa and oxygen partial pressure of 34 MPa.
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    High Temperature Structural Materials
    High Strain Rate Deformation Behavior of Zirconium at Elevated Temperatures
    Dawu Xiao Yinglei Li Shisheng Hu Lingcang Cai
    J. Mater. Sci. Technol., 2010, 26 (10): 878-882. 
    Abstract   HTML   PDF (1101KB)
    High temperature mechanical behaviors of zirconium at high strain rate of 103 s-1 were studied by split Hopkinson pressure bar (SHPB). The influences of strain rate and temperature on the micro-structural evolution, as well as the occurrence of shear localization and subsequent fracture, were also investigated. It's found that the compressive stress-strain response depends sensitively on the applied strain rate and test temperature. Micro-structural observations revealed that the density of the twinning grains reduced as the temperature increased, and increased in response to increasing strain rate. Optical observation of the fracture surfaces showed evidence of adiabatic shear localization along the fracture planes prior to crack formation. Finally, a special form of the Zerilli-Armstrong model was used to describe the mechanical response of zirconium.
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    Recrystallization of Ni3Al Base Single Crystal Alloy IC6SX with Different Surface Mechanical Processes
    Yanan Li Yafang Han
    J. Mater. Sci. Technol., 2010, 26 (10): 883-888. 
    Abstract   HTML   PDF (571KB)
    The recrystallization behavior of Ni3Al base single crystal alloy IC6SX with different mechanical processes has been studied.The specimens of the alloy were treated by surface cleaning and cold working during the blades manufacture, and then heat treated in the temperature range of 800{1260°C for 1 h to 4 h. The microstrcture of the specimens were examined by optical and scaning electron microscopy, and the room temperature tensile property, stress rupture property under the test condition of 1100°C/130 MPa, and the thermal cycle fatigue resistance under 1100−20°C of the specimens with and without recrystallization were carried out. The experimental results showed that the initial recrystallization nucleation temperatures of the alloy by dry grit blasting, wet grit blasting, indentation, shot blasting and burnishing were 900−950°C/1 h, 1000−1100°C/1 h, 1200−1220°C/4 h, 1220−1240°C/1 h and 1220−1240°C/1 h, respectively and the primal recrystallization completing temperatures of the alloy by those mechanical processes mentioned above were 1200−1210°C/1 h, 1100−1200°C/1 h, 1220−1240°C/4 h, 1240−1260°C/1 h and 1240−1260°C/1 h, respectively. The results also indicated that the deformation amount of the specimens by burnishing and dry grit blasting was bigger than that by wet grit blasting and shot blasting according to their recrystallization  emperature and the micro-hardness profile below the surface of specimens. It has been found that the recrystallization had no evident effect on mechanical properties of the alloy.
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    Effect of Solidification Parameters on the Microstructure and Creep Property of a Single Crystal Ni-base Superalloy
    Jian Zhang Jinguo Li Tao Jin Xiaofeng Sun Zhuangqi Hu
    J. Mater. Sci. Technol., 2010, 26 (10): 889-894. 
    Abstract   HTML   PDF (751KB)
    A single crystal Ni-base superalloy was processed with withdrawal rates between 2 and 7 mm/min. The as-cast microstructures, heat treatment response and creep property have been characterized as a function of the withdrawal rate. As expected, the primary and secondary dendrite arm spacing decreased with increasing withdrawal rate; microsegregation degree and porosity distribution were also varied with different withdrawalrates. The withdrawal rate of 2 mm/min resulted in a noticeable residual microsegregation even after full heat treatment. The samples solidified at 7 mm/min exhibited a high density of cast porosities, and this led to a dramatical decline of the creep strain. 4 or 6 mm/min appeared to be the optimum withdrawal rate in the present study, which resulted in a uniform microstructure and an optimum density of cast porosity.
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    Influence of Pre-oxidation on the Hot Corrosion of DZ68 Superalloy in the Mixture of Na2SO4-NaCl
    Enze Liuy Zhi Zheng Xiurong Guan Jian Tong Likui Ning Yongsi Yu
    J. Mater. Sci. Technol., 2010, 26 (10): 895-899. 
    Abstract   HTML   PDF (635KB)
    DZ68 alloy is a new Ni-base directionally solidified superalloy for the blade of advanced turbine engine with high ratio of thrust-mass. In order to investigate the influence of pre-oxidation on the hot corrosion resistance of DZ68 alloy, pre-oxidation treatment was conducted at 950°C in air for 20 h. A mixture of 75% Na2SO4+25% NaCl (in mass fraction) was used for hot corrosion study at 900°C. The microstructure of specimens was investigated by using a scanning electron microscope (SEM) equipped with an energy dispersive spectroscopy (EDS). The compositions of the corroded specimens were determined by X-ray diffraction (XRD). After preoxidation at 950°C in air for 20 h, a protective scale consisting of Cr2O3, Al2O3, NiO, NiCr2O4, and Ni2Ti4O formed on the DZ68 superalloy surface. The pre-oxidation treatment improved the initial incubation stage of the alloy in the mixture of 75% Na2SO4+25% NaCl melts at 900°C. The oxide layer degraded gradually with increasing the time of hot corrosion. Once the oxide layer was damaged, the corrosion rate would increase rapidly, accompanied by obvious spallation of the corrosion products. At 900 °C, the pre-oxidation treatment could not inhibit the accelerated hot corrosion of DZ68 in the mixture of 75% Na2SO4+25% NaCl melts, with a high corrosion rate.
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    Changes of Oxygen Content in Molten TiAl Alloys as a Function of Superheat during Vacuum Induction Melting
    Bo Chen Yingche Ma Ming Gao Kui Liu
    J. Mater. Sci. Technol., 2010, 26 (10): 900-903. 
    Abstract   HTML   PDF (297KB)
    Experimental studies on the melting process of titanium aluminum alloy have been pursued from the viewpoint of contamination. TiAl alloys were prepared with vacuum induction melting (VIM) in calcia crucibles at 1873 K and 1923 K in order to determine the behavior of the oxygen content as a function of temperature, time and frequency of power. The experiment results showed that alloys were uncontaminated except for the increasing of oxygen content which was introduced from the reaction CaO(s)=Ca(in TiAl)+O(in TiAl), and the standard Gibbs energy of the reaction was determined to be ?G0=274000−102.8T (J/mol). Oxygen content increased slowly with the melting time by about 50×10-6 wt pct/min, and decreased with induction melting frequency. Lower superheat and higher melting frequency can be used to reduce oxygen content increasing rate.
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    Vickers and Knoop Micro-hardness Behavior of Coarseand Ultrafine-grained Titanium
    K.P. Sanosh A. Balakrishnan L. Francis T.N. Kim
    J. Mater. Sci. Technol., 2010, 26 (10): 904-907. 
    Abstract   HTML   PDF (385KB)
    The present study focuses on the relationship of hardness with grain size for commercially pure titanium (Cp-Ti) and ultra fine grained titanium (UFG-Ti) produced by equal channel angular process (ECAP) of Cp-Ti). ickers and Knoop indentations of UFG-Ti at different loads was ~2.5 times harder than those of Cp-Ti. X-ray diffraction (XRD) analysis showed peak broadening in UFG-Ti due to reduced grain size and micro-lattice trains. Scanning electron microscopy (SEM) revealed that ECAP had reduced the grain size of Cp-Ti by ~10 imes. Weibull statistics showed UFG-Ti with lower dispersion in hardness values compare to Cp-Ti indicating  more uniform microstructure.
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    Regular Papers
    Dynamic Tensile Property of Zr-based Metallic Glass/Porous W Phase Composite
    Yunfei Xue LuWang Huanwu Cheng FuchiWang Haifeng Zhang AimingWang
    J. Mater. Sci. Technol., 2010, 26 (10): 908-913. 
    Abstract   HTML   PDF (713KB)
    The dynamic tensile deformation and fracture behavior of the Zr-based metallic glass/porous W phase composite were investigated at room temperature by means of the Split Hopkinson Tension Bar (SHTB). It was found that the composite exhibited no appreciable macroscopic plastic deformation prior to catastrophic fracture and the fracture surface was perpendicular to the axial direction. Substantive micro cracks were observed along the interface between W grains or the interface between the metallic glass phase and the W phase. Scanning electron microscopy (SEM) observations revealed that vein-like patterns, dimple-like patterns and substantive ridge-like structures were the typical fracture morphologies on the fracture surface for the metallic glass phase and the morphology of the W phase is a mixture of intergranular and transgranular fracture. Based on those results referred above, the dynamic tensile deformation and fracture mechanism of the Zr-based metallic glass/porous W phase composite were discussed in detail.
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    Synthesis of BSCFO Ceramics Membrane Using a Simple Complexing Method and Experimental Study of Sintering Parameters
    Ensieh Ganji Babakhani Jafar Towfighi Khodadad Nazari
    J. Mater. Sci. Technol., 2010, 26 (10): 914-920. 
    Abstract   HTML   PDF (862KB)
    A new complexing agent Ethylene Diamine N,N0,N0,N0-Tetra N-Acetyl Diamine(EDTNAD), was used for Ba0.5Sr0.5Co0:8Fe0.2O3-δ(BSCFO) synthesis. Some chemicals such as ammonia, nitric acid and citric acid were eliminated in comparison to the commonly used EDTA method. This agent makes complexing synthesis method a single step and causes more homogeneity in the liquid and solid phase. The sintering process was studied at temperatures between 1000 to 1200°C, heating-cooling rates of 1, 2, 5, 10°C/min and dwell time of 2, 5, 10 and 15 h. As-sintered membranes were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), and density analysis. From the SEM images and X-ray diffraction of the BSCFO disks, it could be seen that above 1100°C, crystal intensity decreased, and melting and deformation of the disk occurred. The results show that in restricted temperature range, 1000-1100°C, 10% temperature increase leads to about a 4.5% density increase but a 200% increase in dwell time leads to about a 4% density increase. It could be concluded that the effect of temperature on grain growth, porosity and density is more than that of dwell time. Results also showed that the heating-cooling rate has no significant effect on grain size and density.
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    Yb3+-doped Fluorophosphate Glass with High Cross Section and Lifetime
    Liyan Zhang Yuxin Leng Junjie Zhang Lili Hu
    J. Mater. Sci. Technol., 2010, 26 (10): 921-924. 
    Abstract   HTML   PDF (439KB)
    Yb3+ doped fluorophosphate (FP/Yb) glasses with emission cross section and fluorescence lifetime as high as 0.8388×10-20 cm2 and 2.3 ms were developed, and AlF3 content is proved to decrease the lifetime obviously. Large scale glass casting procedure shows high Tx-Tg doesn0t make better casting crystallization stability in certainty. Although Yb laser is difficult to be obtained in FP glass, a 230 mw laser was still achieved from 2 mm thick samples under 976 nm LD excitation because of the large gain parameter( σemif ) of the FP/Yb glass. Lasing test also proved the relationship between laser output and gain parameter. Combined with its wide and flat effective gain property, this FP/Yb glass is a practical new potential material for low power ultra-short pulse application.
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    Preparation and Photocatalytic Properties of g-C3N4/TiO2 Hybrid Composite
    Xifeng Lu Qilong Wang Deliang Cui
    J. Mater. Sci. Technol., 2010, 26 (10): 925-930. 
    Abstract   HTML   PDF (832KB)
    g-C3N4/TiO2 composite were prepared by hydrolysis of Ti(OC4Hn 9 )4 and the precursors of g-C3N4 at room temperature and annealing in nitrogen atmosphere. X-ray diffraction results revealed that all the products were anatase structure. The chemical nature of O, N of the g-C3N4/TiO2 were identified by X-ray photoelectron spectroscopy, presenting N-Ti-O and N-Ti-N doping status of the composite. The g-C3N4/TiO2 composite showed better photocatalytic activity for the UV and visible-light degradation of Rhodamine B.
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    Mechanical Properties of Cf/Mg Composites Fabricated by Pressure Infiltration Method
    Meihui Songy Gaohui Wu Wenshu Yang Wei Jia Ziyang Xiu Guoqin Chen
    J. Mater. Sci. Technol., 2010, 26 (10): 931-935. 
    Abstract   HTML   PDF (738KB)
    The carbon fibers and the woven reinforced magnesium matrix composites were fabricated by pressure infiltration method. Effects of fiber species, fiber arrangement, hybrid particles and environment temperature on microstructures and properties of the composite were studied. Results showed that the mechanical properties at ambient temperature were affected by interfacial reaction. The magnesium matrix composites reinforced with graphite fibers showed higher strength and elastic modulus due to less interfacial reaction. During load-ing, the fibers were pulled out and the load was transferred through the interfaces, then the fiber bundles were fractured, finally the whole specimen failed. The introduction of hybrid SiC particles during fabrication can improve the mechanical properties of the magnesium matrix composites. Moreover, taking orthogonal carbon fiber woven as reinforcement can modify the anisotropy and reliability of materials.
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    Deformation Mechanism and Stabilization of Martensite in TiNi Shape Memory Alloy
    Shuai Wang Koichi Tsuchiya Lei Wang Minoru Umemoto
    J. Mater. Sci. Technol., 2010, 26 (10): 936-940. 
    Abstract   HTML   PDF (886KB)
    The deformed microstructures of a TiNi shape memory alloy were investigated in present study to clarify the deformation mechanism. It is found that the stress-strain curve was divided into three stages based on the deformation modes. The cause of martensitic stabilization effect was also interpreted by paying special attention to the deformed microstructures. Transmission electron microscopic examination revealed that at the early stage of deformation martensitic reorientation and compound twinning relieved some of the elastic strain energy stored in martensite, and this contributes to the martensitic stabilization effect. However, when deformation strain became larger, the density of dislocations increased correspondingly. Antiphase boundaries were also found. The degree of ordering was therefore decreased due to dislocations and antiphase boundaries. So disordering was another cause of martensitic stabilization e®ect. In the middle stage of deformation martensitic stabilization was attributed to the two reasons above.
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    Cu Ions Dissolution from Cu-bearing Antibacterial Stainless Steel
    Li Nan Ke Yang
    J. Mater. Sci. Technol., 2010, 26 (10): 941-944. 
    Abstract   HTML   PDF (374KB)
    This work addressed the antibacterial mechanism of copper ions dissolved from the Cu-bearing antibacterial stainless steel in the bacterial solution by electrochemical measurements and X-ray photoelectron spectroscopy (XPS). Experimental results showed that the antibacterial rate reached over 99.9% only when the reaction time between the antibacterial stainless steel and Escherichia coli (E. coli) lasted for 9 h, and the antibacterial stainless steel was more susceptible to the corrosion in the bacterial solution, which was attributed to more copper ions dissolved from surface of the steel contacted with the bacteria, a crucial reason leading to death of the bacteria.
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    Mechanically Assisted Electroless Barrel-plating Ni-P Coatings Deposited on Carbon Steel
    Zhaoxia Ping Guoan Cheng Yedong He
    J. Mater. Sci. Technol., 2010, 26 (10): 945-950. 
    Abstract   HTML   PDF (592KB)
    A mechanically assisted electroless (MAE) barrel-plating technique has been developed to deposit Ni-P coatings on carbon steel. The mechanical treatment was carried out in a rolling drum containing carbon steel specimens and glass balls of 2−3 mm diameter, which was submerged in a bath containing electroless plating solution. The coatings are Ni-polycrystalline and have a fine grained structure and smooth surfaces. The hardness and corrosion resistance of the novel coatings are considerably improved compared with the conventional electroless (CE)-plated Ni-P coatings, which are amorphous. After heat treatment at 400°C for one hour, cracks and pores are observed in the CE-plated Ni-P coating, while no cracks appear in the MAE barrel-plated Ni-P coating. The improved properties of the MAE barrel-plated Ni-P coatings demonstrate the advantages of this novel technique, wide applications of which will be found in industries.
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    Effect of Welding Technologies on Decreasing Welding Residual Stress of Francis Turbine Runner
    Shude Ji Liguo Zhang Xuesong Liu Jianguo Yang
    J. Mater. Sci. Technol., 2010, 26 (10): 951-956. 
    Abstract   HTML   PDF (956KB)
    On basis of the subsection welding and the local heating´s reasonable technological parameters obtained by plane experiment, the welding residual stress field of some Francis turbine runner is regulated and controlled. For the experimental plane with a thickness of 16 mm, the effect of subsection welding on decreasing welding residual stress of the prior welding section is obvious when the distance is less than 50 mm away from the end of latter welding section. For the local heating, the best position, where the effect on decreasing the welding residual stress of plane is best, is 60 mm or so away from the edge of heating area. The experimental results of runner show that the subsection welding can make the residual compressive stress engender in the blade dangerous area while the stress value is greatly influenced by the length of the welding section of  blade outlet. The local heating can further decrease the value of residual stress near blade outlet, while the local heating processed after heat treatment is better than that processed before heat treatment.
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    A Hydrogen Sensor Using SrCe0:95Yb0:05O3-α as Proton Conductor and YHx+Y H2-z as Reference Electrode for Determining Hydrogen Pressure in Solid Steel
    Ying Liy Changzhen Wang Zhongli Zhang Jiangxin Wang
    J. Mater. Sci. Technol., 2010, 26 (10): 957-960. 
    Abstract   HTML   PDF (432KB)
    The steel contains a small amount of hydrogen which will escape during the heat treatment. The hydrogen pressure in 16MnRE steel was investigated with a hydrogen sensor, which used SrCe0:95Yb0:05O3-α proton conductor as a solid electrolyte, YHx+YH2-z as a solid state reference electrode and Ni wire as electrode constructing a hydrogen concentration cell, shown as Ni|YHx+YH2-z |SrCe0:95Yb0:05O3-α |[H]steel |Ni. The response time of sensor is less than 10 s. The relational expression of hydrogen partial pressure with temperatures was determined using two shape proton conductors. The results showed the regularity in experimental temperature range, and the hydrogen partial pressure increased as its temperature was raised.
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ISSN: 1005-0302
CN: 21-1315/TG
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