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ISSN 1005-0302
CN 21-1315/TG
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      28 November 1998, Volume 14 Issue 6 Previous Issue    Next Issue
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    Articles
    Controversy about the Origin of the Grain Boundary Internal Friction Peak and Its Clarification
    T.S.Ke (Tingsui GE)(Lab. of Internal Friction and Defects in Solids, Institute of Solid State Physics, Chinese Academy of Sciences,Hefei 230031, China)
    J. Mater. Sci. Technol., 1998, 14 (6): 481-490. 
    Abstract   HTML   PDF (1113KB)

    In the seventies some scientific workers from France and ltaly suggested that the grain boundary internal friction peak (named the Ke peak in the literature) widely accepted as a grain bound ary process, is originated from the motion of lattice dislocations. Since this problem is one of fundamental importance, this controversy has drawn much international attention. Started from 1982, the Hefei research group made a critical analysis of the large amount of literature concerning this problem and performed a series of crucial experiments to clarify the controversy It is concluded that the irrelevant evidence suggested by the controverters comes from the farfetched interpretation and the mis-identification of the internal friction peaks appeared under various experimental conditions and different states of the specimens.

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    Formation Mechanism of NiAl/TiB_2 Nanocomposite by Mechanical Alloying Elemental Powders
    Lanzhang ZHOU and Jianting GUO(Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110015, China)
    J. Mater. Sci. Technol., 1998, 14 (6): 491-496. 
    Abstract   HTML   PDF (3121KB)

    A NiAl/TiB2 nanocomposite is synthesized by mechanical alloying elemental powders. Upon milling for a certain time, an abrupt exothermic reaction occurs and a large amount of NiAl and TiB2 compounds form simultaneously. It is suggested that two separate chemical reactions,i.e. Ni+Al →NiAl and Ti+2B→TiB2, are involved during the exothermic reaction. Additionof Ti and B to Ni-Al system impedes the structural evolution of Ni and Al powders and delays the abrupt reaction. The final products are equilibrium phases without any metastable phases formed. This type of reaction is suggested to be suitable for alloy systems with two large heatrelease reactions.

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    Progress of Nonequilibrium Solidification Theory
    Qingchun LI; Chengsong CUI and Daming XU(Harbin Institute of Technology, Harbin 150001, China)Xiaoguang YUAN(Jilin University of Technology Changchun 130025, China)
    J. Mater. Sci. Technol., 1998, 14 (6): 497-505. 
    Abstract   HTML   PDF (1121KB)

    This paper summarized the theory related to nucleation, interface kinetics, micromorphology evolution and microscopic growth during nonequilibrium alloy solidification. Methods for quantitative analysis of nucleation rate, the criterion of marginal stability, nonequilibrium partition coefficient, as well as the relationship between growth rate with undercooling and dendrite tip radius are presented. Some limitations and future developments of nonequilibrium theory are pointed out.

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    Kinetics and Grain Size Distribution of Two Dimensional Normal Grain Growth with the Modified Monte Carlo Simulation
    Xiaoyan SONG and Guoquan LIU(Dept. of Materials Science & Engineering, University of Science and Technology Beijing, Beijing 100083, China)
    J. Mater. Sci. Technol., 1998, 14 (6): 506-510. 
    Abstract   HTML   PDF (512KB)
    The two-dimensional normal grain growth has been simulated with Monte Carlo method. With a newly modified algorithm, the attained time exponent of grain growth n equals 0.49±0.01,very close to the theoretical value 0.5. By simulating the complete process of normal grain growth, the grain size distribution is found to be initially a gamma distribution, then varies continuously and slowly with time, finally approaches the function proposed by Hillert in 1965 at the quasi steady grain growth stage. The so-called "self-similarity" of the grain size distribution is discussed according to the new simulation results.
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    Relaxation Phenomenon of Te_(10)Ge_(10)Se_(80-x)Sb_x Bulk Glassy System
    A.Elshafie (Physics Dept. Faculty of Science, Menoufia University Shebin El-Koom, Egypt)
    J. Mater. Sci. Technol., 1998, 14 (6): 511-515. 
    Abstract   HTML   PDF (503KB)
    The dielectric constant and dielectric loss of Te10Ge10Se80-xSbx (x=3, 6, 12 at. pct) chalcogenide alloys were measured in the temperature range (300 to 453 K) and the frequency range (100 Hz to 100 kHz). The real dielectric constant ∈′and imaginary dielectric constant ∈" show a decrease with increasing frequency and an increase with increasing temperature. All samples display dielectric dispersion. Both ∈′ and ∈" show a Debye relaxation type. The enthalpy activation energy ΔH and activation energy WH were calculated. Cole-Cole diagram consists of an arc of semicircle shifted from the origin and its center below the real axis at high frequency
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    A New Modification to Shear Lag Model as Applied to Stiffness and Yield Strength of Short Fiber Reinforced Metal Matrix Composites
    Zhonghao JIANGt and Jianshe LIAN(Dept. of Materials Science and Engineering, Jilin University of Technology, Changchun, 130025, China)Dezhuang YANG and Shangli DONG(School of Materials Science and Engineering, Harbin Institute of Technology Harbin 150001,
    J. Mater. Sci. Technol., 1998, 14 (6): 516-522. 
    Abstract   HTML   PDF (747KB)
    A new modification for the shear lag model is given and the expressions for the stiffness and yield Strength of short fiber metal matri×composite are derived. These expressions are then compared with our experimental data in a SiCw/Al-Li T6 composite and the published experimental data on different SiCw/Al T6 composites and also compared with the previous shear lag models and the other theoretical models.
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    Preparation and Characterization of Sol-gel Derived CH_3SiO_(3/2)-SiO_2 Thick Film
    Bing CAO and Congshan ZHU(Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China)
    J. Mater. Sci. Technol., 1998, 14 (6): 523-526. 
    Abstract   HTML   PDF (1070KB)
    A large size CH3SiO3/2-SiO2 self sustained film with the thickness ranging from 50 to 1000 μm was prepared through sol-gel method by adopting CH3Si(OC2H5)3 and Si(OC2H5) as precursors.In this paper, the preparation processes of this thick film are discussed in detail and XRD technique was adopted for the identification of oligomer solution. Also, IR and AFM techniques were used to investigate the film structure and surface morphology
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    High Temperature Creep behaviour of a Si_3N_4 Whisker Reinforced Al-Fe-V-Si Composite
    Liangming PENG; Shijie ZHU;Haoran CHEN and Fugang WANG(Dept. of Materials Engineering,Dalian University of Technology, Dalian 116023, China)Zongyi MA and Jing BI(Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110015, China)
    J. Mater. Sci. Technol., 1998, 14 (6): 527-532. 
    Abstract   HTML   PDF (2549KB)
    The creep behaviour of β-Si3N4 whisker reinforced Al-8.5Fe-1.3V-1.7Si composite has been investigated at the temperature 773 and 823 K. The results are characterized by high stress exponent and high apparent creep activation energy The creep data can be interpreted based on the incorporation of a threshold Stress and a load transfer coefficient into the power-law creep equation. A good correlation between the normalized creep rate and normalized effective stress is available which demonstrates that the creep behaviour of both the alloy and the composite is controlled by the matrix lattice self-diffusion in AI. EXamination on microstructure shows that edge dislocations exist at the interfaces between two adjacent whiskers and the intedeces emit edge dislocations in parallel paired-columns.
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    Behaviour of Composite Ca/P Bioceramics in Simulated Body Fluid
    Yong LIU; Baiyun HUANG; Jianmin RUAN and Yuehui HE(Powder Metallurgy Research Institute, Central-South University of Technology, Changsha 410083, China)
    J. Mater. Sci. Technol., 1998, 14 (6): 533-537. 
    Abstract   HTML   PDF (1711KB)
    Behavior of Ca/P ceramics enhanced by MgAl2O4 in simulated body fluid(SBF) was studied.Results show that, biological apatite can precipitate on the sudece of Ca/P composite ceramics,however, dissolution of the surface of Ca/P composite ceramics also occurs due to a kind of amorphous material which is produced through reaction of MgAl2O4 with Ca/P ceramics at elevated temperature, therefore, the behavior of Ca/P composite ceramics in SBF mainly depends on those two processes. Analyses of joint influence of those two processes show that low content of MgAl2O4 favors the formation of biological apatite, therefore, brings about higher bioactivity
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    Magnetic Properties and Applications of Newly-developed Fe_(73.5)Cu_1Nb_(1.5)V_(1.5)Si_(13.5)B_9 Alloy
    Yanzhong ZHANG (Major R&D Lab. for Functional Metal Materials, Shanghai Iron and Steel Research Institute, Shanghai 2O0940, China)
    J. Mater. Sci. Technol., 1998, 14 (6): 538-542. 
    Abstract   HTML   PDF (612KB)
    The synthetical soft magnetic properties including d.c. and a.c. magnetic properties and pulse magnetic property are reported for a newly-developed nanocrystalline Fe73.5Cu1 Nb1.5V1.5Si13.5B9 alloy The new alloy possesses high d.c. relative initial permeability of 12.5×104 and low coerciv ity of 0.54 A/m. Under the conditions of Bm=0.3 T, f=100 kHz and Bm=0.2 T, f=200 kHz the core losses of the new alloy are 543 kW·m-3 and 834 kW.m-3, respectively which can be compa rable with those of nanocrystalline Fe73.5Cu1Nb3Si13.5B9 alloy. The analyses of core losses have been carried out in the wider range of f=20~104 kHz and Bm=0.0025~0.8 T and the approxi mate expression P(kW·m-3)=1.803 B:f1.77 has been obtained. The analyses of core losses in the range of f=20~104 kHz and Bmf=(10~40)×103(T.Hz) have shown that the core loss and the corresponding amplitude permeability roughly vary as P = 2.347×10-6(Bmf)1.97f-0.2231 and μa = 9.56× 105f-0.7464, respectively for the given product B.f. Some practical applica tions have also been mentioned.
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    Quenchability and Magnetic Properties of Nd_4Fe_(82)B_(14)
    Tiemin ZHAO; Yunyan HAO; Xiaorong XU and Zhuangqi HU(State Key Lab. for RSA, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110015, China)
    J. Mater. Sci. Technol., 1998, 14 (6): 543-546. 
    Abstract   HTML   PDF (1244KB)
    The glass forming ability (GFA), crystallization behaviour and magnetic properties of Nd4Fe82B14 produced by melt spinning were investigated. The experimental results show that the GFA is rather Strong; the crystals precipitation sequence is as follows: Am(amorphous)→Am'+bcc-Fe →Nd2Fe23B3+Fe23B6+bcc-Fe→Fe23B6+Fe3B+Nd2Fe14B+bcc-Fe→Fe3B+Nd2Fe14B+bcc-Fe. The magnetic properties after crystallization are not affected by the cooling rate and the best magnetic properties are Br=0.8436 T, Hcj=266.4 kA/m, (BH)max=48.08 kJ/m3.
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    Electrochemical Behaviour of Cu underneath Thin Electrolyte Film in Atmosphere
    Xueyuan ZHANG and Yuanlong DU(State Key Lab. for Corrosion and Protection, Institute of Corrosion and Protection of Metals,Chinese Academy of Sciences, Shenyang 110015, China)
    J. Mater. Sci. Technol., 1998, 14 (6): 547-550. 
    Abstract   HTML   PDF (344KB)
    An electrochemical cell was devised to investigate corrosion electrochemical behavior of metal underneath thin electrolyte film in atmosphere. The Piontelli's type of Luggin-Haber capillary was inserted from the backward of working electrode. The results show that, cathodic process on Cu is mainly affected by the thickness of the electrolyte film of 0.5 mol/L HCl +1 mol/LNa2SO4 aqueous solution and its anodic dissolution changed from Tafel region to limiting diffusion current.Moreover, the corrosion potential of Cu in due media will increase with decrease of the thickness of the film.
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    A M■ssbauer Study on the Mechanically Alloyed Cu-Sn Alloys
    Yuanzheng YANG; Youlan ZHU and Qiaoshen LI(Dept. of Materials Science and Engineering, Guangdong University of Technology, Guangzhou 510090, China)Xueming MA and Yuanda DONG(Dept. of Materials Science and Engineering, Shanghai University, Shanghai 200072,
    J. Mater. Sci. Technol., 1998, 14 (6): 551-554. 
    Abstract   HTML   PDF (464KB)
    Nanocrystalline E and η electron compounds and supersaturated solid solution of the Cu-Sn system have been prepared by mechanical alloying of elemental Cu and Sn powders. The atomie alloying and microstructure of the resultant alloys have been investigated by XRD, DSC and 119Sn Mossbauer spectroscopy. A little amount of SnO2 was detected by Mossbauer spectroscopy, although no trace of diffiaction peaks occurred in the XRD pattern. Thus the spectra for all the milled samples should be fitted using two quadrupole-splitting doublets: one corre sponding to SnO2, the other corresponding to the resultant alloys. The composition dependence of the hyperfine parameters has been eXtensively discussed and explained well with respect to oxidation, sudece effect resulting from grain refinement, coordination environment asymmetry and distortion caused or/and induced by mechanical alloying.
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    Relationship between the Brittlement Susceptibility and H Permeation Current for UNS G11180 Steel in 5% NaCl Solution with H_2S
    Xueyuan ZHANG and Yuanlong DU(State Key Lab. for Corrosion and Protection, Institute of Corrosion and Protection of Metals,Chinese Academy of Sciences, Shenyang 110015, China)
    J. Mater. Sci. Technol., 1998, 14 (6): 555-558. 
    Abstract   HTML   PDF (1156KB)
    Sulfide stress corrosion cracking (SSCC) behaviour of UNS G11180 steel in 5% NaCl solution with H2S was studied by slow strain rate tensile test (SSRT), SEM and electrochemical hydro gen permeation technique. The results reveal different cracking mechanism and H permeation current (IH) through UNS G11180 steel plate in different concentration of H2S solution. The susceptibility to SSCC of UNS G11180 Steel in 5% NaCl solution with H2S was evaluated by the permeation current(IH, μA), which depends on the concentration (c×10-6) of H2S by the equation:IH = 8.525 ×c0.7249. lt is proved that the electrochemical H permeation method is a practical way to assess the susceptibility to SSCC.
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    Three Dimensional Morphology and Microstructural Evolution of Bainite in Steels
    Xangzheng BO; Hongsheng FANG and Jiajun WANG(Dept. of Materials Science and Engineering, Tsinghua University, Beijing 100084, China)
    J. Mater. Sci. Technol., 1998, 14 (6): 559-563. 
    Abstract   HTML   PDF (2331KB)
    The 3-D morphology of bainite in steels has been studied by SEM with high resolution. Based on the dual-surface observation results, the bainite is divided into three sub-categories:upper,transient and lower bainites. The subplates composing upper bainite sheaf are lath-like while the whole morphology of lower bainite and that of its subplates are plate-shaped. The subunits in lower bainite seem to be lumpish. The 3-D morphology of transient bainite proves to resemble both upper and lower bainites on some aspects. The microStructural evolution of three types of bainite has been discussed.
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    Effect of Mineral Oil on the Mechanical Properties and Fractographs of Fe_3(Al,Cr,Zr) Intermetallic Alloy
    Jiansen NI; Xiaojing WAN Wenjue CHEN and Song WANG(Institute of Metallurgy and Materials Science, Shanghai University Shanghai 200072)
    J. Mater. Sci. Technol., 1998, 14 (6): 564-566. 
    Abstract   HTML   PDF (1092KB)
    The effect of mineral oil on the mechanical properties and fractographs of Fe3(Al,Cr,Zr) in termetallic alloy has been investigated. The results show that the tensile ductility of the Fe3(Al,Cr,Zr) alloy tested in oil is comparable with the results obtained in oxygen and is in sensitive to strain rate. The fracture mode of the Fe3(Al,Cr,Zr) alloy treated at 700℃/1.5 h and tested in oil, is cleavage and with dimples in some areas.
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    A Hyper-ellipsoid Model for Metallurgical Process Modelling by Genetic Algorithm
    Jianfeng LI; Chonghe LI and Nianyi CHEN(Shanghai Institute of Metallurgy Chinese Academy of Sciences, Shanghai 200050, China)Tao LU(Southwestern University of Louisiana, LA, USA)
    J. Mater. Sci. Technol., 1998, 14 (6): 567-568. 
    Abstract   HTML   PDF (249KB)
    A hyper-ellipsoid model, using genetic algorithm as method of computation, has been proposed to be used in certain metallurgical processes. lt is especially suitable for the modelling of the matallurgical processes with data-structure of "inclusion type".
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    In-situ Preparation of Al/TiAl_3(P) Composite by Direct Reaction between Molten Al and TiO_2 Powder
    Yuyong CHEN ;Ziyong CHEN;Qu SHU and Geying AN(National Defense Precision Hot Processing Lab., Harbin Institute of Technology Harbin 150006, China)
    J. Mater. Sci. Technol., 1998, 14 (6): 569-570. 
    Abstract   HTML   PDF (761KB)
    TiAl3 particle reinforced pure Al composite has been made by direct reaction among molten Al, TiO2 and a flux. The composite exhibits high Synthetically properties. The strength and hardness are higher than those of pure Al matrix by 71.5% and 134% respectively However, the elongation is 20.36%, slightly lower than that of the Al matrix.
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    Simulated Calculations of Strain Induced Precipitation Behavior in a Nb-Ti-V Steel
    Jinbo QU; Zhaodong WANG; Xianghua LIU and Guodong WANG(State Key Lab. of Rolling and Automation, Northeastern University Shenyang 110006, China)
    J. Mater. Sci. Technol., 1998, 14 (6): 571-573. 
    Abstract   HTML   PDF (297KB)
    On the basis of regular solution sublattice model and classical nucleation and growth theory Strain induced precipitation kinetics in Nb-Ti-V combined treated microalloying Steels has been calcu lated. The calculated precipitation-time-temperature (PTT) diagram is in reasonable agreement with experimental results obtained from isothermal Stress relaxation method.
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    Factors Affecting the Relation of Fracture Toughness V_(GC) with Critical Void Growth Ratio R_C/R_O
    Li ZHOU(Department of Civil Engineering, Wuyi University,Jiangmen 529020, China)
    J. Mater. Sci. Technol., 1998, 14 (6): 574-576. 
    Abstract   HTML   PDF (342KB)
    The relationship between fracture toughness VGC and critical void growth RC/RO was studied for ten kinds of Steel. The macroscopic fracture toughness VGC was determined by using notched tensile specimens. and the microscopic parameters of critical void growth ratio RC/RO were quantitatively measured under SEM. Then, the coefhcient C in the relation VGC = C In(RC/RO) proposed in author's past work was specifically explored. The correlation of C with tensile proderty parameter φ=σyδ/(Eφn) was presented for the Steel investigated, and the effects of low temperature on C were also discussed. Results show that the coefficient C is linearly related to the parameter and insensitive to low temperature.
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CN: 21-1315/TG
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