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ISSN 1005-0302
CN 21-1315/TG
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      28 May 1994, Volume 10 Issue 3 Previous Issue    Next Issue
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    Structural Applications of NiAl
    R.Darolia(GE Aircraft Engines, 1 Neumann Way, Cincinnati, OH 45215, USA)
    J. Mater. Sci. Technol., 1994, 10 (3): 157-169. 
    Abstract   HTML   PDF (3011KB)
    Alloys based on NiAl offer significant payoffs as structural materials in gas turbine applications due to a unique range of physical and mechanical properties These properties include high melting temperature. low density. high thermal conductivity. and excellent environmental resistance Very significant improvements in the strength and ductility of NiAl single crystals have been achieved through alloying. Tensile strength and stress rupture properties which compete with current Ni-base Superalloys have been achieved through precipitation of an ordered L21 Heusler phase in NiAl single crystals Room temperature tensile ductility as high as 6% has been produced in NiAl single crystals containing less than 0.5% (atomic) of Fe. Ga or Mo. However. a single alloy with both room temperature ductility and sufficient high temperature strength has not yet been developed. While activity to develop on alloy with both high temperature strength and room temperature ductility continues. the Current approach also emphasizes design and test methodologies which can accept a material with limited ductility and damage tolerance More work is required on measuring and understanding strain rate sensitivity and impact behaviour While several significant challenges still remain. excellent progress has been made in many areas, and the prognosis for using NiAl alloys as high temperature structural materials is promising
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    Mechanism and Kinetics of Phase Transformation in Two-phase TiAl-based Alloys
    Shiming HAO+ and Wen tao WU(Dept. of Mater. Sci., Northeastern University, Shenyang, 110006, China)Chuanxi HAN(Northwest Institute for Nonferrous Metal Research, Bao ji, 721014, China)
    J. Mater. Sci. Technol., 1994, 10 (3): 170-174. 
    Abstract   HTML   PDF (1967KB)
    The aged and quenched microstructures of both alloys, Ti-42at-%Al and Ti-45at -%Al,homogenized in the disordered single phase field. were investigated And the results show that the quinched microstructure is a supersaturated single phase of ordered 22. When the supersaturated phase is aged in the two phase range at 1273 and 1373 K, it will transform to a lamellar microstructure of γ+α2. with a discontinuous decomposition mechanism in Ti-42at-%Al alloy and a semicontinuous decomposition mechanism in T1-45at-%Al alloy. With the methods of quantitative metallograph examination and X-ray diffraction analysis. the relationship between the amount of γ, phase precipitation and the time of isothermal transformation is agreed
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    Final Status of a Metal Sample Surface after Multipulse Laser Irradiation in an Ambient Gas
    (C.Boulmer-Leborgne, J.Hermann and B.Dubreuil GREMI, Orleans University. CNRS, France)I. Ursu, M.Dinescu, N,Chitica and I.N.Mihailescu (Institute of Atomic Physics, Bucharest, Romania)(International Center for Theoretical Physics.Trieste, Italy)
    J. Mater. Sci. Technol., 1994, 10 (3): 175-180. 
    Abstract   HTML   PDF (3524KB)
    We have investigated the role of the ambient gas nature and pressure in the structure and appearance of the laser treated zone. and the influence of the total duration and temporal shape of laser pulse with the laser tight being λ= 10.6μm wavelength incident upon a metallic surface at intermediate taser intensities of 107-108 W / cm2. A plasma is accompanied by the action of the laser pulse, It acts as an active moderator among laser beam and target thus determining the final status of the contact surface
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    Study of Polymer Blends with Sub-cluster Theory Part 2 Comparison of PVC/ABS, PVC/SBS Blends
    Riguarng JIN and Hangquan LI(Bejing Institute of Chemical Technology, Beijing, 100029, China)
    J. Mater. Sci. Technol., 1994, 10 (3): 181-187. 
    Abstract   HTML   PDF (1491KB)
    Series of PVC/ABS and PVC/SBS blends of composition 20/ 80. 40/ 60, 60 / 40 and 80 / 20were prepared in a screw extruder. The phase morphology, miscibility and rheological behaviour of two systems were investigated. The viscosity-composition plots were represented by sub-cluster equation, the various differences between two systems are interpreted with the equation parameters
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    Microstructure and Mechanical Properties of ZrO_2-Ni Functionally Gradient Material
    Jingchuan ZHU; Zhongda YIN and Zhonghong LAI(Dept. of Metals and Technology, Harbin Institute of Technology, Harbin, 150001. China)
    J. Mater. Sci. Technol., 1994, 10 (3): 188-192. 
    Abstract   HTML   PDF (2035KB)
    The fabrication. microstructure and mechanical properties of ZrO2-Ni functionally gradient materials (FGM ) have been studied. FGM as well as non-FG M of ZrO2-Ni system was developed by powder metallurgical process. X-ray diffractometer (XRD ). electron probe microanalyzer (EPMA), scanning electron microscope (SEM ) and optical microscope were employed to investigate the crystalline phases. chemical composition and microstructure Experimental results demonstrate that the composition and microstructure of ZrO2-Ni FGM have the expected gradient distribution. There are no distinct interfaces in the FGM due to the gradient change of components. that is, the constituents are continuous in microstructure everywhere. Moreover, Vickers hardness and flexural strength were measured for the common composites as a function of composition. It is made clear that the mechanical properties of the FGM vary corresponding to the constitutional changes as well
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    Microstructure and Mechanical Properties of Two-phase TiAl Alloys in Lamellar Form
    Masaharu Yamaguchi and Haruyuki Inui(Department of Metal Science and Technology, Kyoto University, Sakyo-ku, Kyoto 606, Japan)
    J. Mater. Sci. Technol., 1994, 10 (3): 193-204. 
    Abstract   HTML   PDF (3324KB)
    In two-phase TiAl alloys, the lamellar structures are of special interest and importance since they are so common and persistent. not only under as-cast conditions but also after thermal treatment. However. the lamellar structures are still poor in ductility,although they are beneficial for toughness and high temperature strength. This article will review the recent progress made in understanding the basic mechanical properties of the γ and α2 phases which comprise the two-phase alloys in Iamellar form, and discuss how an improved balance of strength and ductillty in the lamellar form may be achieved
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    Grain Refiner for TiAl Intermetallic Compounds
    Yuehui HE; Yexiang LIU; Baiyun HUANG ; Xuanhui QU and Changming LEI (Powder Metallurgy Research Institute, Central South University of Technology, Changsha, 410083, China)
    J. Mater. Sci. Technol., 1994, 10 (3): 205-208. 
    Abstract   HTML   PDF (1882KB)
    The effect of BN addition on the grain size and rnechanical properties of Ti-34.1 wt-%Al alloy was investigated. It has been found that BN is an effective grain refiner for TiAl base alloys, The addition of a small arnount of BN to TiAl can change the coarse columnar grains of as-cast rnicrostructure into the fine equiaxed grains. It has been also determined that Ti-34.1 wt-%Al-1.0 wt-%BN alloy has better mechanical properties and microstructure
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    Instability and Non-reproducibility of Gibbsite Precipitation Process in Alumina Powder Production
    Mei HONG;Miaoxiu LIU; Weiming ZHANG; Bo TANG and Nianyi CHEN(Shanghai Institute of Metallurgy, Academia Sinica, Shanghai, 200050, China)
    J. Mater. Sci. Technol., 1994, 10 (3): 209-212. 
    Abstract   HTML   PDF (1040KB)
    Gibbsite (Al2O3 3H2O) powder. used for alumina powder production. can be prepared by the decomposition of sodium alum inate solutions induced by dilution or partial neutral ization, This decomposition process exhibits an incubation period and instability or non-reproducibility in reaction kinetics, UV time-scanning spectra and Raman spectra change have been measured to investigate the solution in incubation period and the factors affecting the grain size of gibbsite precipitate
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    Grain Growth Kinetics and Debye Temperature of Nanometer TiO_2 Powders Prepared by a Sol-gel Process
    Ju LUO; Xingzhao DING; Benpei CHEN and Jie KONG(Institute of Solid State Physics, Academia Sinica, Hefei, 230031, China)Yuanda DONG(Dept. of Metallurgy and Materials, Shanghai University of Technology, Shanghai, 200072, China)
    J. Mater. Sci. Technol., 1994, 10 (3): 213-216. 
    Abstract   HTML   PDF (307KB)
    The development of microstructure of nanometer TiO2 powders prepared by a sol-gel process was systematically studied. Grain growth was mon itored using X-ray diffraction (XRD) and transmission electron microscopy (TEM). and the Debye temperature of anatase crystallites was determined. It was found that the grain size of the powders increased slowly with annealing temperature up to 773 K. but grew rapidly in the temperature range of 773-1273K. The activation energies (Ea) for the growth of anatase crystallites in the two temperature regions were calculated to be 16 and 90 kJ / mol, respectively. The Debye temperatures of nanocrystalline anatase powders were all lower than that of microcrystalline anatase. which implies that the bonding force between Ti and O atoms in nanocrystalline TiO2 shourd be smaller than that in microcrystalline state. However. it was noted that the Debye temperature of nanocrystalline anatase increased with the decrease of grain size. This may be attributed to the enhancement in atomic bonding force due to the existence of high surface tension in nanocrystalline powders
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    Thermodynamics of Cu-Y-I (I= Sn, Zn, Pb) Liquid Solutions
    Ting DU and Guodong LI(Central Iron and Steel Research Institute, Ministry of Metallurgical Industry, Beijing, 100081, China)
    J. Mater. Sci. Technol., 1994, 10 (3): 217-220. 
    Abstract   HTML   PDF (279KB)
    The isoactivity of [Y] of samples was obtained in multiple- hole graphite crucibles by controlling the oxygen potential through the reaction 2 [Y]+3CO = Y2O3+3C. The activity interaction coefficients between Y and Sn. Zn, Pb alloying elements were determined by using coniugate gradient method of solving ill-conditioned equations. The equilibrium constant of the reaction 2 [Y]+3 [O] = Y2O3 and the standard free energy of formation of Y2O3 in liquid Cu were obtained at 1200℃
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    Computer Simulating Calculation on the Microstructure Evolutions during Hot Strip Rolling of C-Mn Steels
    Zhenyu LIU; Guodong WANG and Qiaing ZHANG(Northeastern University, Shenyang, 110006, China)
    J. Mater. Sci. Technol., 1994, 10 (3): 221-224. 
    Abstract   HTML   PDF (265KB)
    The program to predict the microstructure evolutions during hot strip rolling of C-M n steels has been developed in this paper, BV using this program, the microstructure changes with the processing parameters were analysed in detail. showing not only a good agreement of prediction with the measured values, but also entirely possibility to optimize hot strip rolling precess by computer simulation
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    Solitary Magnon Localization in Antiferromagnet RbFeBr_3
    Wuming LIU and Benlian ZHOU(International Centre for Materials Physics, Institute of Metal Research, Academia Sinica, Shenyang, 110015, China)Liming GUO(Dept. of Mathematics, Institute of Yunnan Nationality, Xunming, 650031, China)
    J. Mater. Sci. Technol., 1994, 10 (3): 225-228. 
    Abstract   HTML   PDF (336KB)
    Introducing the Dyson-Maleev transformation. the coherent state ansatz and the time-dependent variation principle, we obtain two partial different equations of motion from Hamiltonian. Employing the method of multiple scales. we reduce these equations into the envelope function equations and force the amplitude function to satisfy a nonlinear Schrodinger equation. Using the inverse- scat-tering transformation, we obtain the single soliton solution and discuss the solitary magnon localization in antiferromagnet RbFeBr3
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    Discussion of Dissipation Structure in a Directionally Solidified Alloy
    Liling SUN; Qi WU; Jinghua ZHANG and Zhuangqi HU (State Key Lab. of Rapidly Solidified Nonequilibrium Alloys, Institute of Metal Research, Academia Sinica,Shenyang, 110015, China)
    J. Mater. Sci. Technol., 1994, 10 (3): 229-231. 
    Abstract   HTML   PDF (222KB)
    The dissipation theory was introduced into the solidification area to describe the inherent laws of solidification from a new viewpoint. Discussion demonstrates that the solid / liquid interface in a directionally solidified alloy belongs to a kind of dissipation structure
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    Structural Characteristics of Rapidly Quenched Al-Si Alloys
    Lin LIU(Institute of Solid State Physics, Academia Sinica, Hefei, 230031, China)Yuanda DONG(Dept. of Metallurgy and Materials, Shanghai University of Technology, Shanghai, 200072, China)
    J. Mater. Sci. Technol., 1994, 10 (3): 232-234. 
    Abstract   HTML   PDF (1974KB)
    The structure of rapldly quenched Al-Si alloys (1 and 4 wt-%Si) was systematically studied by optical and transmission electron microscopy (TEM ) as welI as X-ray djffractjon (XRD). ExperimentaIresults show that rapid solidification refines the grain size. extends the solid solubility of Si in Al and Introduces a high density ot defects which exist in the forms of vacancies, dislocations and dislocation loops. etc.. The decomposition process of the alloys was fol lowed by using differential scanning calorimeter (DSC) and the activation energy for precipitation of Si was obtained through Kissinger analysis. The precipitation behaviour of Supersaturated Si in both samples was further examined by TEM. It was found that Si mainly precipitated inside the grains in Al-1 wt-%Si alloy. while in Al-4 wt-%Si alloy. nearly all the Si precipitates distributed along the grain boundaries. This may be due to the structure difference between the alloys in as-quenched state
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ISSN: 1005-0302
CN: 21-1315/TG
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