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ISSN 1005-0302
CN 21-1315/TG
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      28 March 1998, Volume 14 Issue 2 Previous Issue    Next Issue
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    Articles
    State-of-the-Art and Perspectives in the Field of Particulate Nanostructured Materials
    R.A.Andrevski(Institute of New Chemical Problems, Russian Academy of Sciences, Chernogolovka, Moscow Region, 142432 Russia)
    J. Mater. Sci. Technol., 1998, 14 (2): 97-103. 
    Abstract   HTML   PDF (818KB)
    A great attention has been paid to the research and development of nanostructured materials.The main preparation methods of ultrafine particles and nanostructured materials have been summarized. The applications of zone typical nanostructured materials have also been reviewed.The peculiar characteristics and properties. such as density, grain size, hardness, superplasticity,magnetic and catalytic properties have been discussed
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    Effects of Mg on Mechanical Properties of 35CrNi3MoV Steel
    Yueguang YU; Jie FU; Anren WANG and Boping CHEN (University of Science & Technology Beijing, Beijing 100083, China)(Beijing General Research Institute of Mining & Metallurgy, Beijing 100044, China)Wenshan SUN(Inner Mongolia Metallic Materials Research Ins
    J. Mater. Sci. Technol., 1998, 14 (2): 104-108. 
    Abstract   HTML   PDF (2160KB)
    The effects of Mg on the mechanical properties of 35CrNi3MoV steel has been studied in this paper. The results show that Mg has less effect on the tensile properties and hardness of the steel at room temperature, but a right amount of Mg improves impact and fracture toughness and decreases the fracture-transition temperature considerably due to inclusions modification, as well as prolongs the notch stress rupture life dramatically through strengthening grain boundary and modifying boundary carbides. There is an optimum Mg content, which is about 0.0030% in the experimental 35CrNi3MoV steel
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    Development of a New Welding Material for Arc Welding of As-cast Ferritic Ductile Iron
    Daqian SUN; Zhenfeng ZHOU and Jingfei LUAN(Jilin University of Technology, Changchun 130025, China)
    J. Mater. Sci. Technol., 1998, 14 (2): 109-114. 
    Abstract   HTML   PDF (2951KB)
    Using the nickel welding wire, the effect of alloying elements on the chilling tendency of partial fusion zone (PFZ) of arc-welded ferritic ductile iron and the mechanical properties of weld metal have been systematically studied. On this basis a new nickel electrode for arc welding of ferritic ductile iron (QT400-17) is developed for the first time. The mechanical properties of its weld metal can match those of ferritic ductile iron. The width of carbide layer (WCL) in PFZ is significantly decreased, the welded joint has excellent machinability and the weid metal has high hot cracking resistance
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    Damping Capacity and Creep Resistance of Spray Deposited High Silicon Alloy ZA27
    Yongchang LIU ; Gencang YANG and Yili LU (State Key Lab. of Solidification Processing, Northwestern Polytechnic University, Xi'an 710072, China)Liushuan YANG(Dept. of Materials Science and Technology, Luoyang Institute of Technology, Luoyang 471039, China
    J. Mater. Sci. Technol., 1998, 14 (2): 115-120. 
    Abstract   HTML   PDF (1286KB)
    High Al zinc-based alloys are widely used in industry for their good ambient temperature mechanical properties and damping capacity. With the rise of service temperature its damping property increases but mechanical property decreases greatly Here two ways-alloying and spray deposition technique were adopted to improve the service temperature limitation of the alloy ZA27 in an effort to develop a new functional material with high damping capacity and good elevated temperature mechanical property. The effects of addition of 5 wt pct of Si Qn the damping behaviour and elevated temperature creep resistance of alloy ZA27 were investigated. The damping capacity, as well as the relative dynamic modulus, was measured at frequency of 1,4 Hz over the 303 to 573 K. No peak phenomenon was observed for the specimens tested in the temperature range of interest. Experimental results indicated that the damping capacity of the deposited material was 2.8 times higher than that of the cast one at 305 K. The ball hardness values were used to evaluate the creep property and the creep activation energy of the deposited material is 3.9~5.7 kJ per mol higher than that of the as-cast one. The creep rate formuIation was also derived. Finally, the operative damping and creep mechanisms were discussed in the light of the data obtained from its characterization of microstructure, damping capacity and creep reslstance
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    A Partial 1100℃ Isotherm of Ti-Ni-Si Ternary System
    Xiaohua HU; Yimin LIU; Guoliang CHEN and Kequan NI (State Key Lab. for Adv. Met. Mater., University of Science & Technology Beijing, Beijing 100083, China)
    J. Mater. Sci. Technol., 1998, 14 (2): 121-124. 
    Abstract   HTML   PDF (1930KB)
    A partial section of Ti-Ni-Si ternary system at 1100℃was constituted with Ni less than 50 at.pct. Twelve single phase areas were determined. The binary Ti3Si phase proposed to occur at 1100℃ was not found in our investigations. A phase with the composition of Ni2Ti9Si9 detected is possibly a new phase. No linear ternary compound was found. Some of these compounds show noticeable composition range
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    Microstructure and Wear Characteristics of Al-4.5Cu-5Pb Alloy
    Om Prakas Pandey(School of Basic and Applied Sciences, Thapar Institute of Engineering & Technology, Patiala-147001, India)
    J. Mater. Sci. Technol., 1998, 14 (2): 125-131. 
    Abstract   HTML   PDF (4762KB)
    Al-4.5Cu-5Pb alloy was prepared by sand and chill casting. The same alloy was also spray deposited at a gas pressure of 1.6 MPa. The microstructural features exhibit a coarse to fine dendritic morphology for sand and chill cast alloys. Equiaxed grains were observed for spray fOrmed alloys. Wear testing employing a pin-on-disc type set-up, reveaIs considerably lower wear of spray deposited alloy compared to that of chill and sand cast alloys. The morphological features of wear track on specimen and debris indicated a mixed oxidative-cum-adhesive wear mechanisms for these alloys tested in the present investigation
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    Deformation-induced α_2/γ Interfaces in a Hot-deformed Ti-45Al-10Nb Alloy
    Jinguo WANG; Lichun ZHANG and Guoliang CHEN (State Key Lab. for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China )Henqiang YE(Lab. of Atomic Imaging of Solids, Institute of Metal Research, Chinese Academy
    J. Mater. Sci. Technol., 1998, 14 (2): 132-138. 
    Abstract   HTML   PDF (4405KB)
    The structure change of α2/γ interface in a Ti-45Al-10Nb alloy induced by hot deformation was investigated by conventional and high-resolution transmission eIectron microscopy. Two types of hot deformation induced special α2/γ intedeces, coherent intedeces with high density of ledges and semi-coherent α2/γ intedeces were found to be due to the absorption of mobile dislocations into the α2/γ inteface. For the misoriented semi-coherent α2/γ interfaces, the densities of dislocation ledges increase with the misoriented angle between (111)γ and (0001)α2 planes, and 1/3[111] Frank partial dislocations were involved in the dislocation ledges. Formation mechanism of these deformation-induced α2/γ interfaces was discussed to be related to the role of α2/γ interface5 adjusting the deformation as a dislocation sink absorbing the slipping dislocations in the γ phase
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    Magnetism and Its Dependence on Annealing Temperature for Sputtered Co/Cu Multilayers
    Ruwei GAO ; Yihua LIU; Shishen YAN Deheng ZHANG and Lin ZHANG(Dept. of Physics, Shandong University, Jinan 250100, China)
    J. Mater. Sci. Technol., 1998, 14 (2): 139-142. 
    Abstract   HTML   PDF (1132KB)
    Magnetism and its dependence on annealing temperature for r.f. sputtered Co/Cu multilayers have been investigated. It was found that the easy magnetization axes of the films are paralIel to the substrate and the magnetic properties of both as-sputtered and annealed multilayers are isotropic in the film plane. The coercive field Hc is 4.8 kA/m and the ratio of remanence-tosaturation magnetization Mi/M is about 0.73 for as-sputtered samples. Both Hc and Mr/Ms increase with increasing annealing temperatures, especially when annealing temperatures are higher than 400℃. These experimental results can be interpreted using the ferromagnetic exchange coupling and the pinning theory of the coercivity
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    Microstructure and Tensile Properties of Spray-deposited IC6 Alloy
    Guofa MT; Zhou LI; Shifan TIAN; Xanguo ZHAO and Zhiping LUO (Institute of Aeronautical Materials, Beijing 100095, China)Songyan ZENG and Qingchun LI(School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China)
    J. Mater. Sci. Technol., 1998, 14 (2): 143-146. 
    Abstract   HTML   PDF (1943KB)
    The microstructure and mechanical properties of a Ni3Al based Ni-Al-Mo superalloy-IC6 which possesses low impurity content and high density by spray deposition technique have been studied.The results indicate that the IC6 alloy has good tensile strength and elongation both at room and intermediate temperatures
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    Revision of a CCT Diagram of the Simulated ADI Weld Metal and Its Application in Actual Welding
    Deyuan LI; Zhenfeng ZHOU and Daqian SUN (Jilin University of Technology, Changchun 130025, China)Chengji SHAO(Shenyang Polytechnical University, Shenyang 110023, China)
    J. Mater. Sci. Technol., 1998, 14 (2): 147-150. 
    Abstract   HTML   PDF (1540KB)
    A continuous cooling transformation (CCT) diagram of the simulated ADI weld metal has been developed by means of the Formastor-F diagram measurement apparatus, and revised by comparing with the actual welding. Finally the revised diagram was used to determine the welding technology
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    Microstructure and Mechanical Properties of Si_3N_4 Composites Containing SiC Platelet
    Tao WEI; Yu ZHOU Tingquan LEI and Yujin WANG (School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China)
    J. Mater. Sci. Technol., 1998, 14 (2): 151-155. 
    Abstract   HTML   PDF (4121KB)
    Hoppressed Si3N4/SiC platelet composites had been investigated with respect to their microstructure and mechanical properties. The results indicate that Vickers hardness, elastic modulus and fracture toughness of the composites were increased by the addition of SiC platelet until the content up to 20 vol pct. A slight decrease in flexural Strength was measured at room temperature with increasing SiC platelet content. The high temperature flexural strength tests at 1150, 1250, and 1350℃ were conducted. It was found that the flexural strength at elevated temperature was degraded with the rising temperature, and the downward trend of flexural strength for the composite containing 10 vol. pct SiC platelet was less. The results indicate that SiC platelet had a positive influence on the high temperature strength. Effects of SiC platelet reinforcement were presented
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    Fracture Toughness and Microcracks on Natural Apophyllite Crystals
    PR.Dhar; K.Bamzai and PN.Kotru (Dept. of Physics, University of Jammu, Jammu-180004, India)
    J. Mater. Sci. Technol., 1998, 14 (2): 156-160. 
    Abstract   HTML   PDF (2817KB)
    Results on fracture toughness of natural apophyllite crystals when subjected to impact are presented. The morphology of the cracks and fracture has been studied. It is found that the crack formation does not show any anisotropic property and remains the same whatever may be the orientation of the crystal. The average values of the fracture toughness KC and brittleness index, as determined from measurements of crack length, are estimated to be 0.107 gμm-3/2and 4.19μm-1/2 respectively for the a(100) plane. The yield strength forα(100), p(111) and c(001) planes of apophyllite crystals for lower loads is 2250. 2160 and 1840 MPa and for higher loads is 1510, 1600 and 1430 MPa respectively
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    Effect of Oxygen Concentration and Annealing Theatment on the Optical Properties of the Transparent Conductive CdIn_2O_4 Thin Films
    Bin WU; Changyong CHEN and Shibin ZHANG(Physics Dept., Lanzhou University, Lanzhou 730000, China)Wanlu WANG and Kejun LIAO(Applied Physics Dept., Chongqing University, Chongqing 400044, China)
    J. Mater. Sci. Technol., 1998, 14 (2): 161-166. 
    Abstract   HTML   PDF (557KB)
    Transparent conductive cadmium indium oxide films (CdIn2O4) were prepared by r.f. reactive sputtering from Cd-In alloy targets under an Ar-O2 atmosphere. Electrical conductivity of the order of 105Ω-1.m-1 and the optical transmission as high as 94% are easily attained by postdeposition annealing treatment. The effects of oxygen concentration in the reactive gas mixture and post-deposition annealing treatment on the optical transmittance as well as optical parameters, such as refractive index (n), extinction coefficient (k), real part (ε') and imaginary part (ε") of the dielectric constant, were studied in the visible and near-infrared region. The highfrequency dielectric constant ε∞ the plasma frequency ωP, and the conduction band effective mass mc of different samples were also investigated
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    Textures and Magnetic Properties of Grain Oriented Electrical Steel Produced by Cross Shear Rolling
    Gang LIU; FU WANG; Kemin QI; Jianlun SUN Liang ZUO and Zhide LIANG (School of Materials and Metallurgy, Northeastern University, Shenyang 110006, China)(School of Chemical Science and Engineering, Liaoning University, Shenyang 110036, China)
    J. Mater. Sci. Technol., 1998, 14 (2): 167-170. 
    Abstract   HTML   PDF (481KB)
    Commercial grain oriented electrical steels were made by cross shear rolling (CSR) with a chosen mismatch speed ratio 1.1. Original sheets of 0.75 mm thick, which had been produced by conventional cold rolling and intermediate annealing were rolled to thickness from 0.35 mm to 0.15 mm, and followed by industry annealing. The deformation texture and the magnetic properties were measured. Results indicate that: in the condition of the CSR, the deformation texture of rolled sheet is generally similar to that of conventional rolled sheet; for sheets with the thicknesses from 0.35 mm to 0.25 mm, favorable deformation textures, mainly consisting of {111} <112>, are also found at subsudece layers, which may help produce sharp Goss texture, and after the final annealing, the magnetic properties of sheets are not lower than that of conventional rolled sheets
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    Size-dependent Initial Sintering Temperature of Ultrafine Particles
    Qing JIANG(Dept. Materials Science and Engineering, Jilin University of Technology, Changchun 130025, China)Frank G.Shi(School of Engineering, University of California, Irvine, CA 92697-2575, USA)
    J. Mater. Sci. Technol., 1998, 14 (2): 171-172. 
    Abstract   HTML   PDF (204KB)
    A model for the size-dependent initial sintering temperature of ultrafine particles was established. The theoretical predictions for the size-dependent sintering temperatures of W, Ni and Ag ultrafine particles are consistent with available experimental evidence
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    Microwave Plasma Sintering of Nanocrystalline Alumina
    Jinhui PENG (Dept. of Metallurgy, Kunming University of Science and Technology, Kunming 650093, China)Pinjie HONG and Shushan DAI(Dept. of Chemistry, Yunnan University, Kunming 650091, China)D. Vollath and D. V.Szabo(Forschungszentrum Karlsruhe GmbH, Inst
    J. Mater. Sci. Technol., 1998, 14 (2): 173-175. 
    Abstract   HTML   PDF (861KB)
    Sintering of nanocrystalline alumina by microwave plasma has been studied. The relative density,microhardness of the samples with different grain sizes by microwave plasma and other sintering techniques have been compared
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    Hydrogen Effects on the Mechanical Properties of Ti-24Al-11Nb-3V-1Mo Alloy
    Yexin CHEN and Xaojing WAN(Institute of Materials Science, Shanghai University, Shanghai 200072, China)
    J. Mater. Sci. Technol., 1998, 14 (2): 176-178. 
    Abstract   HTML   PDF (1466KB)
    The effects of hydrogen on the mechanical properties at room temperature of a Ti3Al based alloy Ti-24Al-11Nb-3V-1Mo have been investigated. The results show a parabolic rate relationship between the average hydrogen concentration of the alloy at constant temperature and charging time. The mechanical properties (ultimate bending strength and deflection) decrease with increasing hydrogen content in the alloy. The fractographic feature indicates that the decrease of the mechanical properties is due to the crack nucleation and propagation at the hydride Ti3AIH
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    Positron Annihilation Study on the Microstructural Stability in Rapidly Solidified Al_(92.3)Fe_(4.3)V_(0.7)Si_(1.7)Mm_(1.0) Alloy
    Wei JIA; Meikuang Tseng and Jianqiang WANG(Dept. of Material Science, Northeastern University Shenyang 110006, China)Liangyue XIONG and Yelong CHU(International Ceoter for Materials Physics, Institute of Metal Research, Chinese Academy of Sciences,Shenyan
    J. Mater. Sci. Technol., 1998, 14 (2): 179-181. 
    Abstract   HTML   PDF (367KB)
    Rapidly solidified Al92.3Fe4.3V0.7Si1.7Mm1.0 alloy has been studied by positron lifetime spectroscopy and the variations on the intedecial defects with the annealing temperature were revealed by an analysis of the lifetime results. The intedece characteristics derived from the positron-lifetime results could be used to give a satisfactory interpretation of the dependence of mechanical properties on the annealing temperature
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    Shape Memory Effect of an Aged Fe-Mn-Si-Co-Mo Alloy
    Zhong WANG; Wei CAI and Liancheng ZHAO(School of Mater. Sci. & Eng,, Harbin Institute of Technology, Harbin 150001, China)
    J. Mater. Sci. Technol., 1998, 14 (2): 182-184. 
    Abstract   HTML   PDF (803KB)
    The effect of ageing on the microstructure, mechanical properties and shape memory effect (SME) in a newly developed Fe-24Mn-5Si-8Co-4Mo shape memory alloy has been studied. It was found that Fe2Mo particles precipitate during ageing and thereby increase hardness and strength of the alloy The SME of the alloy can be remarkably improved by ageing and a maximum SME can be obtained when aged at 873 K. When the ageing temperature is over 873 K, the SME decreases with increasing ageing temperature. The reason for the improvement of SME by ageing in the Fe-Mn-Si-Co-Mo alloy is discussed
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    ANN Optimization Method for High Strength High Fracture Toughness Steels
    Ping GENG; Meikuang Tseng and Cunfu QIAN(College of Science, Northeastern University Shenyang 110006, China)
    J. Mater. Sci. Technol., 1998, 14 (2): 185-187. 
    Abstract   HTML   PDF (330KB)
    The two-target optimization problem for high strength high fracture toughness steels has been investigated. An effective method for two-target optimization of multi-variable non-linear complicated system is developed by combining simulated annealing algorithm with artificial neural network
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    Corrosion-Facilitating Local Plastic Deformation for α-Ti in Methanol
    Hong LU;Tiancheng ZHANG and Wuyng CHU(Dept. of Material Physics, University of Science & Technology Beijing, 100083 Beijing, China)Wanxu ZHU; Xunqing SHI and Baochen LIU( Dept. of Surface Science & Corrosion Engineering, University of Science & Technology
    J. Mater. Sci. Technol., 1998, 14 (2): 188-190. 
    Abstract   HTML   PDF (1118KB)
    The effect of corrosion process on facilitating local plastic deformation for α-Ti in methanol has been investigated with the micro-multiplicative moire interferometer technique. The size of plastic zone and the plastic strain ahead of loaded notch have been measured. The results show that the anodic dissolution, or corrosion process itself can enhance the plastic zone and the plastic strain ahead of a loaded notch during stress corrosion of α-Ti in methanol solution
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