Started in 1985 Semimonthly
ISSN 1005-0302
CN 21-1315/TG
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      28 July 1995, Volume 11 Issue 4 Previous Issue    Next Issue
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    Articles
    Current Status of High Resolution Electron Microscopy and Its Applications to Materials Science and Condensed Matter Physics
    Douxing LI and Hengqiang YE (Laboratory of Atomic imaging of Solids, Institute of Metal Research,Chinese Academy of Sciences, Shenyang, 110015, China)
    J. Mater. Sci. Technol., 1995, 11 (4): 235-259. 
    Abstract   HTML   PDF (18541KB)
    The present paper summarizes the current status of high resolution electron microscopy (HREM)and the applications of HREM to materials science and condensed matter physics. This review recounts the latest development of high resolution electron microscope, progress of HREM and the applications of HREM, including the crystal structure determination of microcrystalline materials and characterization of the local structure of the defects and nanostructured materials as well as qualitative and quantitative analysis of the grain boundaries, interfaces and interfacial reactions in the advanced materials by means of HREM in combination with electron diffraction,subnanometer level analysis, image simulation and image processing.
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    Fracture of Aramid Fiber/Epoxy Resin Micro Composites
    Xia WANG; Chunxin ZHANG; Shijiu JIN and Yunzhao YU (Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100080, China)
    J. Mater. Sci. Technol., 1995, 11 (4): 260-264. 
    Abstract   HTML   PDF (1394KB)
    Kevlar-49 fiber was modified through cold air plasma treatment and plasma grafting with acrylic monomers. Fracture of aramid fiber/epoxy resin micro composites has been studied by means of single fiber pull-out test. Tow types of pull-out curves are correlated with the different failure modes. A polyacrylic acid-co-ethyl acrylate graft layer can improve the adhesion and protect the fiber from damage caused by interfacial stresses.
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    Kinetics and Thermodynamic Parameters of the Copper Exchange on Na-montmorillonite Clay Mineral in Selected Solvents
    A.A.Zaghlou;M.EI-Batouty and Sh.A.Shazly (Chemistry Dept., Faculty of Science, Alexandria University, Alexandria, Egypt)
    J. Mater. Sci. Technol., 1995, 11 (4): 265-268. 
    Abstract   HTML   PDF (393KB)
    The kinetics of Cu ion exchange on Na-montmorillonite clay mineral has been investigated at three temperatures, in three solvents: H2O, ethylene glycol and glycerol. Solvent effects on the reaction rate have been discussed. The thermodynamic activation parameters were calculated and discussed in terms of solvation effects. The determined isokinetic temperature indicates that the reaction is enthalpy controlled where the interaction between solvent and clay surface plays an important role. A reaction mechanism which describes the solvent effect on the rate of Cu ion exchange is proposed.
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    Comparing the Effectiveness of Coatings on Carbide and Cermet Cutting Tool Inserts
    K.H. W.Seah; M.Rahman and C.H.Lee (Dept. of Mech. & Prod. Eng., National University of Singapore, 10 Kent Ridge Crescent, Singapore 0511 T.N.Goh (Dept. of Ind. & Sys. Eng., National University of Singapore, 10 Kent Ridge Crescent, Singapore 0511)
    J. Mater. Sci. Technol., 1995, 11 (4): 269-275. 
    Abstract   HTML   PDF (666KB)
    A series of metal cutting experiments was performed on a CNC lathe to evaluate the performance of various coatings on different tool substrates. The workpiece material was plain medium carbon steel and the cutting tool materials were carbide and cermet inserts coated with various single as well as multilayer coatings. Machining was done under various cutting conditions of speed and feed-rate, and for various durations of Cutting. The output parameters studied were the cutting forces (axial, radial and tangential), the surface roughness of the workpiece, as well as the tool wear (crater and flank wear). From these results, the performances of the various cutting inserts are evaluated and compared. Results show that cutting forces are significantly lower when using coated cermets than when using coated carbides although different coatings on the same substrate also result in different cutting forces. However, there is less difference in the surface roughness of the finished workpiece for the various coatings and substrates.
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    Calculation of the Quasiternary Systems: Si_3N_4-Y_2O_3-SiO_2,Y_2O_3-SiO_2-BeO and Y_2O_3-Al_2O_3-BeO
    Lin LI(Dept. Materials Science and Engineering, Shanghai University, Shanghai, 200072, China)Qing AO (Dept. of Materials Engineering, Shandong Polytechnic University, Jinan, 250014, China)O. Van Der Biest; P Wollants and L.Delaey (Dept. MTM, Katholieke Un
    J. Mater. Sci. Technol., 1995, 11 (4): 276-280. 
    Abstract   HTML   PDF (449KB)
    Based on the thermodynamic model of Kaufman for the calculation of quasibinary and quasiternary system, numerical method for the calculation of stable equilibrium is developed and thermodynamic data of undefined phases are discussed in this work for several ceramic systems.The calculated isothermal sections in Si3N4-Y2O3-SiO2 system meet well with other previous calculated phase diagrams and experimental results. The diagrams in Y2O3-SiO2-BeO and Y2O3-Al2O3-BeO systems are calculated for the approach of prediction.
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    Volatilization Rate of SnS from Sn-Fe Mattes
    Yixin HUA and Chunpeng LIU(Dept. of Metallurgy, Kunming Institute of Technology Kunming 650093, China)
    J. Mater. Sci. Technol., 1995, 11 (4): 281-286. 
    Abstract   HTML   PDF (571KB)
    The kinetics of volatilization of SnS from Sn-Fe mattes was investigatd by using a unique experimental method. A water model test was also carried out for the proper interpretation of the experimental results. It has been demonstrated that the volatilization process displays the first order kinetics with respect to the concentration of SnS in the matte. The process is controlled by the mass transport of SnS in gas phase. The apparent activation energy for the process is found to be 127.4 kJ/mol. The effect of temperature and carrier gas flow rate on the reaction rate is discussed in accordance with the mathematical model developed.
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    Effects of Ni-Cr Based Alloys on the Fiber Metallurgy Characteristics of Short Cast Iron Fibers
    Julong HE; Dongli YU;Ming ZHANG; Yongiun TIAN;Shizhen CHEN and Dongchun LI (Yanshan University, Qinhuangdao, 066004, China)
    J. Mater. Sci. Technol., 1995, 11 (4): 287-290. 
    Abstract   HTML   PDF (2139KB)
    The liquid sintering characteristics have been studied in the sintered compacts of short cast iron fibers added with Ni-Cr based alloy powder at the sintering temperature of 1100℃. With the increase of Ni-Cr based alloy content, the microstructure of sintered compact of short cast iron fibers transformed from pearlite+ferrite to martensite+austenite, meanwhile volume expansion appeared in the sintered compact, leading to more pores. The proper addition of P-Fe powder could restrain the expansion of the sintered compact and increase the strength and hardness of the sintered compact.
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    Effects of Solution Temperature on Tensile Properties of SiC_w/2024Al Composite
    Zongyi MA; Yuxiong LU;Ming LUO and Jin BI (Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110015, China)Yuzheng ZHANG (Northeastern University Shenyang, 110006, China)
    J. Mater. Sci. Technol., 1995, 11 (4): 291-294. 
    Abstract   HTML   PDF (1921KB)
    The effects of solution (quench) temperature on the properties of SiCw/Al composite have been investigated using tensile tests. The experiments indicate that the solution temperature of the composite fabricated by P/M technique can be raised to 560℃. The tensile strength of the composite is obviously dependent on solution (quench) temperature and the composite solutionized at 540℃ exhibits a maximum of tensile strength and elongation-to-failure. These results can be accounted for by the variation of the dislocation density in the composite.
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    Sputtering Rates of Alloys in Glow Discharge
    Jianshi REN and Gongshu ZHANG (Institute of Metal Research, Chinese Academy of Science, Shenyang, 110015, China)Zhenshu WANG and Jinwei ZHAO (Shanghai University of Technology Shanghai, 200072, China)
    J. Mater. Sci. Technol., 1995, 11 (4): 295-298. 
    Abstract   HTML   PDF (310KB)
    The sputtering rates of alloys were investigated under constant Ar pressure and voltage supplied.The alloys studied in this work range from binary intermetallic alloys to ternary and quaternary alloys. It is revealed that the sputtering rates of alloy targets under steady states are where q is the sputtering rates of alloys, Ci the weight percentage of i-th component in the alloy,and qi0 the sputtering rate of pure metal of i-th component.
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    EPR of Irradiation Induced Centers in Some Vitreous Matrices Containing Copper
    M.Peteanu; L.Cociu and I.Ardelean (Faculty of Physics, Babes-Bolyai University, 3400 Cluj-Napoca, Romania)
    J. Mater. Sci. Technol., 1995, 11 (4): 299-303. 
    Abstract   HTML   PDF (558KB)
    Boro-germanate glasses containing copper, i.e., xCuO(1-x)[GeO2·B2O3] subjected to gamma irradiation, were studied by means of EPR. Comparisons were made with the xCuO·(1-x)[Na2B4O7] system. Irradiation induced centers were detected. These are: electron trapped at a hydrogen compensated germanium ion centers; boron oxygen hole centers and electron trapped at an oxygen vacancy centers. Strong dependence of the paramagnetic irradiation-induced centers concentration on the CuO content of the sample was evidenced.
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    Temperature Dependent Work-hardening Behaviour in an Fe-Mn-Si-Cr-Ni Shape Memory Alloy
    Lijian RONG;Yiyi LI and Changxu SHI (Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110015, China)
    J. Mater. Sci. Technol., 1995, 11 (4): 304-306. 
    Abstract   HTML   PDF (1734KB)
    The work-hardening behaviour in an Fe-Mn-Si-Cr-Ni alloy has been investigated using tensile test at different temperatures and TEM observation. It was found that besides the intersection of εmartensite, the intersections of ε martensite with stacking fault and the cross-slip of dislocation which is difficult to occur in the alloy with low stacking fault energy are also important factors to the temperature dependent work-hardening behaviour.
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    Synthesis and High Pressure Study on Ca_(1-x)Ln_xSiO_3
    Jinghai YANG; Juyuan ZHANG; Yizhi GENG (Institute of Solid State Physics, Siping Normal College, Siping, 136000, China)Bin YAO (State Key Lab. for RSA, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110015, China)
    J. Mater. Sci. Technol., 1995, 11 (4): 307-309. 
    Abstract   HTML   PDF (264KB)
    In this paper, for the first time, Ca1-xLnxSiO3 (Ln=Y. La, x=0.1, 0.2) was synthesized with three methods of high temperature (HT) under atmospheric pressure (AP), high temperature (HT) combined with high pressure (HP) and sol-gel method. The sample obtained at the stable range of 4.3-5.0 GPa pressure and 1050-1100℃ temperature with HT and HP method has a cubic perovskite structure, which has the minimum lattice parameter of 0.3535 nm so far,the sample with triclinic structure was obtained by sintering at atmosphere, and the sample synthesized with sol-gel method has monoclinic structure. SEM analysis shows that rare earth ions take the lattice site of Ca, but the distribution of rare earth ions in the samples synthesized with HT and HP is not homogeneous.
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    X-ray Crystallinity Studies of Palladium Polyacrylate
    R.Hussain and D.Mohammad (Pakistan Institute of Nuclear Science and Technology, P.O.Box 1356, Islamabad, Pakistan)
    J. Mater. Sci. Technol., 1995, 11 (4): 310-312. 
    Abstract   HTML   PDF (297KB)
    Free radical polymerized palladium polyacrylate was characterized by X-ray diffraction. Various parameters including mean crystallite size, interchain separation and radius of gyration have been calculated and discussed with respect to the concentration of Pd in the polymeric salt. The results show that polymer is predominantly amorphous in nature.
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ISSN: 1005-0302
CN: 21-1315/TG
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