Started in 1985 Semimonthly
ISSN 1005-0302
CN 21-1315/TG
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      28 March 1995, Volume 11 Issue 2 Previous Issue    Next Issue
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    Analysis of Solidification in Spray Atomized and Codeposited Metal-matrix Composites Part Ⅰ: Atomization
    V.Erukhimovitch and J.Baram(Materials Engineering Department, Ben-Gurion University of Negev, Beer-Sheva, Israel)
    J. Mater. Sci. Technol., 1995, 11 (2): 79-90. 
    Abstract   HTML   PDF (1210KB)
    Fluid mechanics, heat transfer and liquid-to-solid phase transformation are assessed in optimizing the spray atomization and codeposition process parameters for size refinement and microstructural uniformity of the deposited material. Atomization gas velocities, atomized droplets velocities, convective heat transfer coefficients, thermal histories of the solidifying droplets, freezing rates, fraction solid evolution and solid-liquid interface propagation velocity are calculated. The influence, on the deposit microstructural features, of process parameters like the atomization gas pressure, the pouring tube orifice diameter, the geometrical features of the atomization device,the potency of , pre-existing or injected as reinforcement, nucleation sites, the wetting angle between the liquid melt bnd impurity particles acting as preferred nucleation sites, the in-flight distance of the solidifying droplets in the atomization chamber, i5 evaluated. As a result of the evaluation, appropriate choice of the adjustable process parameters for the production of powders and/or deposits with desired grain size and microstructure, can be made.
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    Abrasive Wear Characteristics of Carbon and Low Alloy Steels for Better Performance of Farm Implements
    M.Kumar and R. C Gupta(Centre of Advanced Study, Dept. of Metallurgical Engineering, Institute of Technology,Banaras Hindu University, Vaanasi -221 005, India)
    J. Mater. Sci. Technol., 1995, 11 (2): 91-96. 
    Abstract   HTML   PDF (585KB)
    The low stress abrasion behaviours of heat treated mild, medium carbon and high C - low Cr steels, which are generally used in making farm implements, have been investigated. The simple heat treatment greatly improves the hardness, tensile strength and abrasion resistance of medium carbon and high C - low Cr steels. The results indicate that the material removal during abrasion is controlled by a number of factors, such as hardness, chemical composition, microstructure and heat treatment conditions. The conclusion is that the heat treated high C - low Cr steel and mild steel carburized by using coaltar pitch provide the best hardness and abrasion resistance and thus appear to be the most suitable materials for making agricultural tools.
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    Structural, Optical and Electrical Properties of Evaporated CdSe Films
    H.P. Sarma, N.Rangaraan and K.R.Murali(Central Electrochemical Research Institute, Karaikudi -623 006, India)
    J. Mater. Sci. Technol., 1995, 11 (2): 97-101. 
    Abstract   HTML   PDF (395KB)
    CdSe films are of great interest for use in thin film photoelectric devices. A simple chemical precipitation method is adopted for the first time to synthesise CdSe powder. Films on glass obtained at different substrate temperatures TS such as 300, 373, 423 and 473 K have been characterised by X-ray diffraction, optical absorption and Hall measurements.
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    High Manganese Steel Alloying Process and Its Influence on Microstructure and Properties of the Steel
    Zhongliang SHP and Mingyuan GU (State Key Laboratory of Metal Matrix Composite Materials, Shanghai Jiaotong University,Shanghai, 200030, China)Junyou LIU(Dept. of Materials Science & Engineering, Hebei Institute of Mechanical-Electrical, Shijiazhuang, 050
    J. Mater. Sci. Technol., 1995, 11 (2): 102-108. 
    Abstract   HTML   PDF (2366KB)
    The influence of two kinds of alloying processes, adding Nb (or Ti) and N-Mn alloy as well as adding Nb (or Ti) and spraying N2, on microstructures and properties of a high manganese steel has been studied. It has been found that adding Nb(or Ti), accompanying with N-Mn alloy, is unfavourable to microstructure compactness of the high manganese steel, but adding Nb (or Ti)and spraying N2 into the melt is good for refining austenitic grain, forming a lot of hard particles and improving microstructure compactness. The mechanical properties of the high manganese steel have relation to the content of elements Nb or Ti. Its fracture mode will turn ductile fracture into brittle cleavage fracture gradually. By X-ray and TEM analysis, it is proved that the austenite can be transformed to deformation-induced α martensite after adding a certain amount of element Nb (or Ti). The microstructure transformation of alloying high manganese steels through deformation is one of methods for strengthening austenite matrix and increasing the work-hardening rate as well as improving antiwear property.
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    Bearing Wear Resistance of Monotectoid Zn-Al Based Alloy (ZA-35)
    Yaohua ZHU(Instituto de Investigaciones en Materials UNAM, Apdo P.70-360, Mexico D.F.04510, Mexico)Biao YAN and Wei HUANG(Dept. of Materials Science and Engineering, Tongji University, Shanghai 200092, China)
    J. Mater. Sci. Technol., 1995, 11 (2): 109-113. 
    Abstract   HTML   PDF (2058KB)
    Based on the fundamental investigations of ageing characteristics and microstructures, pedermance properties of monotectoid Zn-Al based alloy ZnAl35Cu3Si2 (in wt-%) named ZA-35 were studied. The test results showed the ZA-35 alloy displayed better bearing wear resistance than copper bronze and lower coefficient of thermal expansion than other Zn-Al alloys. These excellent performance properties have been verified by practical applications.
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    Nondestructive Evaluation of Ferroelectric Multilayer Capacitors Using Electromechanical Resonances
    Hongtao SUN; Hongfang WANG; Liangying ZHANG and Xi YAO(Electronic Materials Research Laboratory, Xi'an Jiaotong University, Xi'an, 710049, China)
    J. Mater. Sci. Technol., 1995, 11 (2): 114-118. 
    Abstract   HTML   PDF (453KB)
    Under the mechanically free and clamped boundary conditions, electromechanical resonances of ceramic multilayer capacitors are calculated using vibration and piezoelectric equations. Multilayer capacitors made of ferroelectric BaTiO3 and Pb(Mg1/3Nb2/3)O3 ceramics have been used to examine the theoretical calculation. Frequency spectra of impedance and phase angle, capacitance and loss tangent of the capacitors under dc bias fields are carefully measured. A sudden change around the resonant frequency is observed in these spectra. A damped resonance indicates a defective capacitor while an undamped resonance is corresponding to defect free.Experimental results suggest that it is possible to use the spectra as a real time nondestructive evaluation method.
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    Some Dielectric Properties of Some Resin Varnishes
    S.A.El-Henawii(Faculty of Science, Helwan University, Cairo, Egypt)
    J. Mater. Sci. Technol., 1995, 11 (2): 119-121. 
    Abstract   HTML   PDF (246KB)
    The dielectric constant, the dielectric loss and the power factor of three types of resins namely polyesteramide, alkyd polyesteramide and alkyd resins were measured with in the frequency range of 105 to 107 Hz and the temperature range of 20 to 50℃. The activation energy of dielectric relaxation and the entropy changes were also calculated using the usual rate equation. The results obtained are recorded and discussed.
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    Role of Alloying Elements P, Cu in Liquid Phase Sintering of Short Cast Iron Fiber
    Dongli YU; Julong HE; Yongiun TIAN; Shizhen CHEN and Dongchun LI(Yanshan University, Qinhuangdao, 066004, China)
    J. Mater. Sci. Technol., 1995, 11 (2): 122-126. 
    Abstract   HTML   PDF (2182KB)
    The effects of alloying elements P and Cu on the sintering process and mechanical properties of short cast iron fiber compact have been studied. The experimental results show that the sintering can be enhanced obviously by addition of phosphorus. The radial crush strength of sintered compacts increases with P content up to 0.15%, but when P content is over 0.15%,eutectics formed at the interfaces of fibers cause the decrease in strength and quasi-cleavage fracture of the sintered compact. Addition of Cu could not only reduce the volume shrinkage effectively, but also increase the strength and hardness of the sintered compact.
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    A Monte-Carlo Approach to Cellular Pattern Evolution for Binary Alloys during Directional Solidification
    Junming LIU; Zhiguo LIU and Zhuangchun WU(National Laboratory of Solid State Microstructures, Nanjing University, Nanjing, 210008, China)
    J. Mater. Sci. Technol., 1995, 11 (2): 127-132. 
    Abstract   HTML   PDF (581KB)
    A Monte-Carlo approach of cellular pattern evolution during directional solidification of a binary alloy has been carried out by imposing a non-uniform probability distribution of particle emission from the particle source, as an approach to the contribution of solute redistribution to the interface evolution. Both the bulk and interface diffusion have been involved in the simulation,and coarsening of the cellular patterns with time has been clearly revealed. The remarkable influence of the interface relaxation and the solute redistribution on the profile of solidifying interface has been presented.
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    Role of Edge and Screw Dislocations in Deformation of Metals
    Chiwei LUNG(International Centre for Materials Physics, Institute of Metal Research,Chinese Academy of Sciences, Shenyang, 110015, China)
    J. Mater. Sci. Technol., 1995, 11 (2): 133-136. 
    Abstract   HTML   PDF (377KB)
    It was widely accepted that the screw dislocation is responsible for the strong temperature dependence of the yield stresses observed in bcc metals. In this paper, we show the role of edge dislocations in the deformation of metals and point out that in some cases, its main contribution to the plastic flow behaviour cannot be ignored.
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    Densification and Sintering Kinetics of Rare Earth (α′+ β′)-Sialon Composites
    Hao WANG; T.S.YEN; Hanrui ZHUANG and Weiying SUN (State Key Lab. on High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics,Chinese Academy of Sciences, Shanghai, 200050, China)
    J. Mater. Sci. Technol., 1995, 11 (2): 137-140. 
    Abstract   HTML   PDF (429KB)
    The sintering processes of Re-(α' + β')-sialon composites (Re=Sm, Dy, Yb) have been investigated by using a specially designed high temperature dilatometer. The initial densification of various samples starts at about 1200℃, and the maximum shrinkage rate of these sialon composites occurs at about 1500℃. The light rare earth sialon has a noticeably tower densification temperature and a higher final shrinkage. The sirtering kinetics of Re-(α' +β')-sialonare much more complex. The Kingery's liquid phase sintering model appears to be applicable,but the mechanism of mass transport in stage two appears to be changeable. The controlling factor shiffs from solution-precipitation to diffusion when densification process proceeds from the earlier part to the later part of this stage.
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    Rheological Behaviour for Polymer Melts and Concentrated Solutions Part Ⅱ: Material Function with Nagai Chain Constraints and Determination of Their Parameters from Flow Curves
    Mingshi SONG; Sizhu WU and Xiuyun DU(Research Institute of Polymeric Materials, Beijing University of Chemical Technology, Beijing, 100029, China)
    J. Mater. Sci. Technol., 1995, 11 (2): 141-152. 
    Abstract   HTML   PDF (904KB)
    An integral constitutive equation and a set of material functions for describing the strain history of polymer melts were formulated in terms of the Cauchy-Green and Finger tensors. A simple memory function and the dependence of ηo and τt on M3.4 were derived from the theory of non-linear viscoelasticity with constraints of entanglements for polymer melts and substituted into the Oldroye-Walters-Fredickson constitutive equation. An integral constitutive equation for polymer melts was consequently obtained. Some material functions of the constitutive equation related to certain "test flow" are examined as follows : (1) simple steady shear flow; (2) steady elongation flow; (3) small-amplitude oscillatory shear flow; (4) stress growth upon the inception of steady shear elongation flow; (5) stress relaxation (modulus and compllance). These theoretical relations for simple steady shear flow were compared with experimental data from our laboratory and references for various polymer melts and concentrated solutions. A good agreement between the theory and experiment was achieved.
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    Effects of Charge Inheritance on High Zn-Al Based Alloy
    Haoran GENG; Jiaji MA and Shihao YANG(Dept. of Material Engineering, Shandong Polytechnic University Jinan, 250014, China)
    J. Mater. Sci. Technol., 1995, 11 (2): 153-156. 
    Abstract   HTML   PDF (1388KB)
    The effects of several kinds of charges on microstructure and mechanical properties of ZA27zinc alloy have been Studied. Experimental results show that a certain amount of the mechining charge, granular charge and remelting charge treated in suitabIe way can increase greatly the mechanical properties of ZA27 alloy. It is thought that the charges possess microstructure inheritance to ZA27 alloy, so cause the property changes according to the viewpoints of casting alloy inheritance.
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ISSN: 1005-0302
CN: 21-1315/TG
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