Started in 1985 Semimonthly
ISSN 1005-0302
CN 21-1315/TG
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      28 July 1994, Volume 10 Issue 4 Previous Issue    Next Issue
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    Microstructure and Mechanical Behaviour of Proton-and Ion-irradiated Ll_2 Intermetallic Compounds
    F. C. Chen and A .J.Ardell (Dept. of Materials Science and Engineering, University of California, Los Angeles, CA 90024-1595, USA)
    J. Mater. Sci. Technol., 1994, 10 (4): 235-245. 
    Abstract   HTML   PDF (5568KB)
    The results of mechanical testing and transmission electron microscopy on the ordered intermetallic Ll2 compounds1Zr3Al, Ni3Al, Ni3Si and Ni3Ge after irradiation with protons or heavy ions at high or low tem peratu re are presented and discussed. Using a minjaturjzed disk-bend test. it was found that proton irradiation of Zr3Al. Ni3Al and Ni3Si raises their yield strength :a single test of Ni3Ge shows no effect on the fracture stress of this brittle intermetallic The Vickers microhardness of all four alloys is raised by proton irradiation. The irradiations cause all the alloys to disorder. the extent of which is dependent on irradiation temperature Microstructural defects are produced by the irradiations Some exhibit strain-field contrast under dynamic two-beam diffracting conditions. Other distinct defect clusters are imaged only in dark-field using su perlattice reflections, These latter defects are discussed in the context of current arnorphization models. The strength increase of Zr3Al, Ni3Al and Ni3Si is attributed to a combination of disordering and strengthening from defects. The lack of an effect of irradiation on the fracture stress of Ni3Ge. in which voids were observed, requires further experiments
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    Fibre Metallurgy Characteristic of Short Cast Iron Fibre and Its Applications for Diamond Wheel
    Shizhen CHEN; Dongli YU; Julong HE; Yongjun TIAN and Dongchun LI (Yanshan University, Qinhuangdao City, 066004, China)
    J. Mater. Sci. Technol., 1994, 10 (4): 246-250. 
    Abstract   HTML   PDF (3566KB)
    A kind of diamond grinding wheel bonded by short cast iron fibres has been developed. ln comparison with high quality bronze bonded diamond grinding wheel. the new wheel was more suitable to grind hard and brittle materials like ceramics. For Si3N4, the grinding efficiency has been raised two times and the grinding ratio five times
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    Titanium Aluminides: Science, Technology, Applications and Synthesis by Mechanical Alloying
    F.H.Froes (Institute for Materials and Advanced Processes (IMAP), College of Mines and Earth Resources, University of Idaho, Moscow, Idaho 83843-4195, USA)
    J. Mater. Sci. Technol., 1994, 10 (4): 251-262. 
    Abstract   HTML   PDF (3088KB)
    The production. characteristics. and commercialization of monolithic and composite titanium aluminides are summanzed with emphasis on use in the demanding aerospace industry. The attractive elevated temperature properties combined with alow density make these materials of great interest, but inherently low "forgiveness", and environmental concerns, must be overcome before widespread use will occur One synthesis method for the production of monolithic titanium aluminides-mechanical alloying- will be discussed in detail
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    Electron Microscopy Analysis of Deformation Induced ε Martensite Transformation in an Fe-Mn-Si-Cr-Ni Alloy
    Fuxing YIN; Jianxin ZHANG; Ruixiang WANG and Nanju GU (Hebei Institute of Technology, Tianjin, 300132, China)(To whom correspondence should be addressed)Kenichi Shimizu (Kanazawa Institute of Technology, Ishikawa, Japan)
    J. Mater. Sci. Technol., 1994, 10 (4): 263-268. 
    Abstract   HTML   PDF (4338KB)
    The configurations of stacking faults and morphologies of strain induced ε martensite plates in an FeMnSiCrNi alloy were investigated through electron microscopy analysis. The Shockley partial dislocation structures. sensitive to external stress. determine the configurations of stacking faults in γphase Partial dislocations at the front sides of stacking faults are usetul for the nucleation of εmartensite plates. The growth of ε martensite plates is accompanied with the disappearance of local pre-existing stacking faults, The ε martensite vanants behave in three morphologies of respective stopping. continuous penetrating and intersections with the formation of secondary ε martensite plates
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    Solid Solution Sm_(1+x)Ba_(2-x)Cu_3O_y and Effect of Quench Temperature on SmBa_2Cu_3O_y
    Xianran XING; Zhiyu QIAO; Wenxia YUAN and Shoukun WEI (University of Science and Technology Beijing, Beijing, 100083, China)(To whom correspondence should be addressed)Xiaolong CHEN, Guanghui RAO and Jingkui LIANG (Institute of Physics, Chinese Academy o
    J. Mater. Sci. Technol., 1994, 10 (4): 269-272. 
    Abstract   HTML   PDF (406KB)
    By X-ray powder diffraction technique and oxygen content analysis, a solid solution Sm1+xBa2-xCu3Oy has been determined in the range 0≤x≤0.4. When x<0.25. the Sm1+xBa2-xCu3Oy presents orthorhombic symmetry, and the orthorhombic-tetragonaJ transition ocCurs at x = 0.25. With the increase of x, TC decreases and finally breaks. The correlation between ox ygen content and phase structure at different quench temperatures related to Sm Ba2Cu3Oy has been investigated as well
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    Inhomogeneity of Grain Boundaries of ZnO Varistor
    Hongtao SUM; Qin ZHOU; Liangying ZHANG and X YAO (Electronic Materials Research Laboratory, Xi'an Jiaotong University, Xi'an 710049, China)(To whom correspondence should be addressed)
    J. Mater. Sci. Technol., 1994, 10 (4): 273-278. 
    Abstract   HTML   PDF (1342KB)
    The zinc oxide varistor with a low threshold voltage and large grain size was derived with ZnO crystalline seeds from a molten salt process The chemical composition and I-V characteristics of single grains and single grain boundaries were determined by means of energy dispersive spectrum (EDS) and microcontact measurement respectively. Temperatu re dependence of dielectric loss at various frequencies and voltage dependence of capacitance were carefully measured. Based on these experimental data. the barrier heights of giain boundaries are estimated to be 0.2. 0.5 and 0.6 eV respectively corresponding to thick, th in and direct contact grain boundaries. In addition. a computerized electrical circuit simufation is employed in simulating I-V characteristics of single grain boundary within ZnO varistor. By adjustjng parameters of resistor and diode, a general agreement between the measured data and simulated curves is achieved
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    Mechanism of Macroalloying-induced Ductility in Ni_3Al
    Changgong MENG; Jianting GUO and Zhuangqi HU (Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110015, China)(To whom correspondence should be addressed)
    J. Mater. Sci. Technol., 1994, 10 (4): 279-284. 
    Abstract   HTML   PDF (639KB)
    The bonding characteristics of Ni3Al doped with ternary elements has been investigated by means of the discrete variational Xα (DV-Xα) cluster method. From the computations. the addition of ternary element M (M= Pd. Ag. Cu and Co) substituting for the Ni sttes leads to the increase of delocalized bonding electrons. and the mechanism of ductilization of Ni3Al bV doping with M is explained based on the analysis of bonding characteristics. The increase of delocalized bonding electrons lowers the covalent bond directionality and strengthens grain boundary. The difference of strength between M-Al bond and M-Ni bond is an important factor in the effect of alloy stoichiometry on ductility. The larger the difference. the more the sensitivity to the alloy stoichiometry
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    Hot Hydrostatic Extrusion of Mechanically Alloyed Al-4.9Fe-4.9Ni Powders
    Guoxian LIANG; Zhimin LI and Erde WANG (Dept. of Metals Science and Technology, Harbin Institute of Technology, Harbin, 150001, China)(To whom correspondence should be addressed)
    J. Mater. Sci. Technol., 1994, 10 (4): 285-288. 
    Abstract   HTML   PDF (1231KB)
    Al-4.9 Fe-4.9 Ni alloy powders have been synthesized by mechanical alloying. The rnechanically alloyed powders are consolidated by hot hydrostatic extrusion. The results show that extrusion tempereture. extrusion ratio and lubricant have great effects on the quality of extruded rods and their mechanical properties, The mixture of graphite and glass powders as lubricant can prevent the oxidization of cold compacted billet by cladding the billet with this lubricant before heating. This technique greatly simplifies the conventional densification process of powders
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    Preparation and Gas-sensing Characteristics of Na~+-doped ZnO Single Crystals
    Suying PAN and Junbiao MAO (Center for Materials Research and Analysis, Wuhan University of Technology, Wuhan, 430070, China)(To whom correspondence should be addressed)
    J. Mater. Sci. Technol., 1994, 10 (4): 289-292. 
    Abstract   HTML   PDF (920KB)
    ZnO single crystals were grown by vapor phase reaction of Zno powder with active carbon powdei at an elevated temperature The typical crystals were colorless and transparent with maximum size o4 0.1 mm in diameter and 25 mm in length, The gas-sensing characteristics of Na+-doped anc undoped single crystals were investigated in 1 %H2. Co and CH, in air between 1 50 and 600℃. It was found that the undoped ZnO single crystals showed little gas sensitivity in air. and Na+-doping can greatly enhance the senstivity by increasing the resistivities. The maximum sensitivity of the samples is 22 (Ra/ Rg) for H2. 1 2 for CO and 4 for CH4
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    γ″Precipitate in Inconel 718
    Jianhong HE (Dept. of Mater. Sci. and Eng., Tsinghua University, Beijing, 100084, China)S.Fukuyama and K. Yokogawa (Chugoku National Industrial Research Institute, Hiro-suehiro 2-2-2, Kure, Hiroshima, 737-01, Japan (To whom correspondence should be addres
    J. Mater. Sci. Technol., 1994, 10 (4): 293-303. 
    Abstract   HTML   PDF (4241KB)
    The γ"precipitate in Inconel 718 Ni-base superalloy has been investigated using TEM. Based on a calculation of diffraction pattern. the orientation relations between precipitates and matrix are given in detail. The influence of solution temperature on growth of γ" precipitates was investigated. and a γ" precipitate free area near δ phase was found. The coarsening behaviour of γ" precipitates during short time aging is discussed
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    Quasicrystalline Phase in As-cast Mg-Zn-Y-Zr Alloy
    Yali TANG; Ningfu SHEN and Xin YUAN (Research Center for Materials, Zhengzhou Institute of Technology, Zhengzhou, 450002, China)Zhiping LUO and Shaoqing ZHANG (Institute of Aeronautical Materials, Beijing,100095, China)(To whom correspondence should be ad
    J. Mater. Sci. Technol., 1994, 10 (4): 304-306. 
    Abstract   HTML   PDF (672KB)
    An icosahedral phase in as-cast Mg 5. 78Zn-0.89Y-0.48Zr (wt-%) alloy has been identified with transmission electron microscope (TPM) The selected area diffraction patterns (SADP) from the phase show a five-fold symmetry of a quasicrystalline structure. The energy dispersive X-ray spectra (EDXS) indicate that the quaternary phase has a chemical composition of 67.6Zn-1 9.4Mg-8,1 Y-4 9Zr in at -%
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    Nucleation in Metallic Melt on the Ground and underElevated Gravity
    Kuiying CHEN; Zhuangqi HU and Bingzhe DING (State Key Lab of RSA, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110015, China)(To whom correspondence should be addressed)
    J. Mater. Sci. Technol., 1994, 10 (4): 307-309. 
    Abstract   HTML   PDF (289KB)
    The expressions for nucleation rate in metallic melt on the ground and under elevated gravity have been derived theoretically and the effects of gravity and elevated gravity on nucleation rate have been discussed. A comparison of nucleation rate under microgravity with those on the ground and under elevated gravity has also been made
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    Electrode Characteristics of MmNi_5-based Alloys for Nickel-Metal Hydride Batteries
    Mingming GENG (Dept. of Precision Alloy, Central Iron & Steel Research Institute, Beijing, 100081. China)
    J. Mater. Sci. Technol., 1994, 10 (4): 310-312. 
    Abstract   HTML   PDF (337KB)
    Negative electrodes of the Ni-metal hydride battery were made from hydrogen storage alloy Mm0.9Ti0. 1Ni3. 9Mn0.4Co0.4Al0.3 mod fied by coating with Ni or mixing with Co powder. The cell volume expansion of hexagonal structure was about 12 % after coating with 11 % Ni on the alloy Surface,When this alloy was mixed with Co powder. the discharge capacity and the utilization efficiency of the hydrogen storage alloy increased. When the alloy was coated with 11 wt-% Ni and also mixed with 10 wt-% Co powder. the capacity decay for a small sealed cylindrical cell (AA size. 1 Ah) was only about 4 % after 200 cycles
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ISSN: 1005-0302
CN: 21-1315/TG
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