Started in 1985 Semimonthly
ISSN 1005-0302
CN 21-1315/TG
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      28 May 1995, Volume 11 Issue 3 Previous Issue    Next Issue
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    On Structure and Thermodynamics of Coherent Nanocrystals
    R.Luck(Max-Planck-Institut fur Metallforschung, Institut fur Werkstoffwissenschaft, Seestrade 92, D-70174 Stuttgart, Germany)Ke LU(National Key Lab. for Rapidly Solidified Nonequilibrium Alloys and International Center for Materials Physics,Institute of M
    J. Mater. Sci. Technol., 1995, 11 (3): 157-164. 
    Abstract   HTML   PDF (871KB)
    Several classifications for the nanocrystalline morphologies are introduced. It is demonstrated that coherency and coherence strain are important physical quantities, which influence the stability, the morphology and the grain size of nanocrystalline domains. Examples for different nanocrystalline textures are reported
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    Analysis of Solidiflcation in Spray Atomized and Codeposited Metal-matrix Composites Part Ⅱ: Reinforcement Injection and Deposition
    V. Erukhimovitch and J.Baram (Materials Engineering Department, Ben-Gurion University of Negev, Beer-Sheva, Israel)
    J. Mater. Sci. Technol., 1995, 11 (3): 165-170. 
    Abstract   HTML   PDF (618KB)
    The influence of the injection of reinforcing particles (for the production of metal matrix composites and of the droplets-to-substrate heat transfer on the resulting microstructural uniformity of spray atomized and codeposited composite material is analyzed. The reinforcement particles injection velocity has to be limited between an upper and a lower critical values. in order to ensure entrapment into the matrix droplets in flight. The thermal history of the injected droplets during the deposition stage is calculated with the assumption that the in-flight solidifying droplets reach the substrate while containing still at least 20% liquid volume fraction, in order to avoid porosity of the deposited material. The substrate to pouring-tube orifice distance where that condition is achieved depends strongly on the atomization pressure and the convective heat transfer coefficient of the substrate. It is demonstrated that "tailoring" the microstructures and the reinforcement volume percent in the deposited material is feasible. The critical process parameters : the atomization pressure, the melt flow rate. the substrate to pouring-tube orifice distance, the reinforcement particles injection location and rate can all be adequately chosen in order to obtain any desired microstructure, grain size, reinforcement volume percent, with the additional benefit, if wanted, of rapid solidification processing
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    Properties of Cast Hiduminium/Corundum Particulate Composites
    K.H. W. Seah(Dept. of Mechanical Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore 0511)R.S.Kulkari and S.C.Sharma (Dept. of Mechanical Engineering, R.V.College of Engineering, Mysore Road, Bangalore-560-059, Karnataka, Indi
    J. Mater. Sci. Technol., 1995, 11 (3): 171-175. 
    Abstract   HTML   PDF (497KB)
    This paper reports some results obtained in an investigation to see how increasing the corundum dispersoid content from o% to 7% in a matrix of hiduminium alloy affects the tensile and compressive strengths, the hardness and the casting characteristics of the composite. The results show that as the corundum content is increased, ultimate tensile strength (UTS)- compressive strength and hardness increase remarkably, whereas fluidity of the molten composite during casting drops significantly. It was found that just a minute amount of corundum is sufficient to cause a fairly large change in the mechanical properties and the fluidity of the molten material.This drop in castability is one of the reasons why adding corundum beyond 7 percent is not recommended. If other factors are kept constant, the fluidity is seen to slightly improve if the pouring temperature of the molten metal were increased from 670 to 710℃
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    Calorimetric Measurements of CuAlNi Alloys
    Qing JIANG(Dept. Metal Material Engineering, Jilin University of Technology, Changchun, 130025, China)
    J. Mater. Sci. Technol., 1995, 11 (3): 176-180. 
    Abstract   HTML   PDF (499KB)
    The martensitic transformation of CuAlNi single crystals is measured by DSC (differential scanning calorimeter). An isothermal single interface DO3→2H transformation arises when the specimen is quenched at a slow rate, but 2H→DO3 transformation always proceeds with multiple interfaces due to the existence of stored elastic energy inside martensite. The elastic energy is essentially stored on the martensitic interfaces and results in As→Mf, which brings a separate spectrum of heat flow on the measured curve. The size of stored elastic energy affects the hysteresis
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    Interaction of Mechanical and Electrochemical Factors during Corrosion Fatigue of Fe-26Cr-1Mo Stainless Steel in 1M H_2SO_4 Solution
    Jianqiu WANG; Jin LI; Ziyong ZHU and Wei KE (Corrosion Science Laboratory, Institute of Corrosion and Protection of Metals Chinese Academy of Sciences, Shenyang, 110015, China)Qishan ZANG and Zhongguang WANG (State Key Laboratory for Fatigue and Fracture
    J. Mater. Sci. Technol., 1995, 11 (3): 181-186. 
    Abstract   HTML   PDF (605KB)
    The cyclic plastic straining electrode technique has been used to investigate the transient electrochemical behaviour of Fe-26Cr1Mo stainless steel in 1M H2SO4 solution at a passive potential.The influence of plastic strain amplitude and plastic strain rate on the dissolution current response was analysed. The experimental results showed that the transient current was dependent on the competitive process of the surface film rupture and repassivation of the new surface. The high plastic strain amplitude and the high plastic strain rate caused a change of electrochemical activity of specimen surface. In the condition of low strain amplitude and strain rate, the characteristics of current response was mainly relative tp the process of new surface repassivation.The competition kinetics has been analysed through the comparison of plastic strain rate and repassivating rate
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    Crystallization Behaviour of Laser Synthesized Nanometric Amorphous Si_3N_4 Powders
    Yali LI; Yong LIANG; Zhuangqi HU(National Key Lab. of Rapidly Solidified Nonequilibrium Alloys, Institute of Metal Research,Chinese Academy of Sciences, Shenyang, 110015, China)
    J. Mater. Sci. Technol., 1995, 11 (3): 187-191. 
    Abstract   HTML   PDF (1413KB)
    The crystallization behaviour of the laser synthesized nanometric amorphous Si3N4 powders with the particle size of 15 nm in diameter has been studied between 1200° and 1700℃ by XRD,TEM and FTIR techniques. A small amount of β-Si3N4 formed at 1250℃ and increased slowly until the α- β transformation happened at 1700℃, whereas α-Si3N4 appeared at 1300℃ andincreased rapidly between 1500-1600℃. The formation of β phase at the lower temperature was caused by the nitridation of free Si due to the preexisted β-nuclei in the Si3N4 particles, whereasthe α phase was formed by solid crystallization from the amorphous matrix. There were α and β SiC formed at 1700℃ due to the presence of Sio and Co gases in the system. FTIR analysis shows that two new IR absorption at 1356 and 1420 cm-1, and an overall strong absorption in wide wavenumber range resulted from the powders annealed at 1600 and 1700℃ respectively
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    Fracture Behaviour of Laser Clad Fe- and Ni-base Alloy Coatings on a Cast Iron under SEMI Loading
    Aihua WANG; Changsheng XIE; Kaijin HUANG; Beidi ZHU and Zengvi TAO (Dept. of Materials Science & Engineering, Huazhong University of Science & Technology, Wuhan, 430074, China)
    J. Mater. Sci. Technol., 1995, 11 (3): 192-196. 
    Abstract   HTML   PDF (2291KB)
    Laser cladding technique has been applied to renovate some partially-damaged (or worn) components with Fe, Ni, Co-base alloys, hence to improve their hardness values and wear resistance successfully in previous reports. But for some punching or shearing cast iron dies damaged or worn in automobile manufacture, the renovated surfaces also bear some impact loading. Therefore, a small-energy and multi-impact (SEMI) test was designed to investigate the fracture behaviour of renovated cast iron dies achieved by laser cladding of Fe and Ni-base alloys under SEMI loading to meet above requirement. observations show that the fracture took place in the substrate near to the substrate/coating interface rather than at the interface. The tempering temperature has a great influence on the cycles to fracture of laser-clad samples under SEMl loading, i.e. the low tempering temperature of 300℃ gives a maximum cycle to fracture, while a higher tempering temperature of 400℃ has a minimum. Furthermore, the fracture mechanism has also been discussed in present study
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    Rheological Behaviour for Polymer Melts and Concentrated Solutions Part Ⅲ: A New Multiple Entanglement Model to Predict the Dependence of Linear Viscoelastic Function (η_0, Ψ_(10)~0,η_(ext)~0) on the Ranges of Primary Molecular Weights and the
    Mingshi SONG and Jincai YANG (Research Institute of Polymeric Materials, Beijing University of Chemical Technology, Beijing, 100029, China)Yiding SHEN(North West Institute of Light Industry, Shanxi Xianyang, 712087, China)
    J. Mater. Sci. Technol., 1995, 11 (3): 197-208. 
    Abstract   HTML   PDF (1073KB)
    It is shown theoretically that the viscoelasticity of polymer melts is determined by three combining factorst they are the primary molecular weight and its distribution, the number of entanglement sites on polymer chain and the sequence distribution of constituent chains in entanglement spacings. A unified quantity for the three combing factors is the average constrained dimensional number of constituent chains in the long entanglement spacings (v). A new relation of v to the primary molecular weight and the number of testing polymers were derived from the multiple entanglement and reptation model, and a new method for determining v was proposed. The dependences of linear viscoelastic functions on the primary molecular weight and its distribution were derived by the statistical method. When Mn=6Me to 18 Me, the values of (v) can range from 3.33 to 3.70. Their values are in a good agreement with the experiment data, and it can slightjy vary with the different species of polymers and the different ranges of molecular weight of polymers
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    Microstructure and Mechanical Properties of Al-4.9Ni-4.9Ti Alloy Prepared by Mechanical Alloying
    Guoxian LIANG; Zhichao LI and Erde WANG (College of Materials Science and Engineering, Harbin Institute of Technology, Harbin, 150001, China)
    J. Mater. Sci. Technol., 1995, 11 (3): 209-212. 
    Abstract   HTML   PDF (2962KB)
    Mechanically alloyed Al-4.9Ni-4.9Ti powders were prepared by milling mixed aluminium, titanium and nickel powders, and then consolidated by hot hydrostatic extrusion. The microstructures of milled powders and extruded bars were characterized by X-ray diffraction and transmission eIectron microscopy observation. The results show that mechanical alloying and consolidating processes have great effects on the microstructures and mechanical properties of extruded materials. Polycrystalline materials having an ultrafine grain size may be prepared by mechanical alloying. The strength and thermal stability are improved with the increasing of processing time of mechanical alloying, since grain size decreases and volume fraction of dispersoids increases as milling time increased
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    Investigation on Initial Stage of Electroless Deposition on Low Carbon Steel and Pure Iron
    Yiyong WU; Yongqian WANG; Yongzhong ZHANG and Mei YAO (School of Materials Science and Technology, Harbin Institute of Technology, Harbin, 150001, China)Xinguo HU(Applied Chemical Department, Harbin Institute of Technology, Harbin, 150001, China)
    J. Mater. Sci. Technol., 1995, 11 (3): 213-216. 
    Abstract   HTML   PDF (1818KB)
    Initial process is influenced by substrate microstructure according to the study of initial stage of electroless plating on low carbon steel and pure iron. For low carbon steels, depositing on cementite is prior to that on ferrite, and for pure iron, the grain boundaries and some favourable grains are deposited more easily. The initial reactions of electroless depositing of Ni-P alloy have been tentatively proposed
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    Electron Microscopy Studies on Ultrafine Zirconia Powders from Solvent Extraction with Tributyl Phosphate in Kerosene
    Chuanfang YANG and Jiayong CHEN (Institute of Chemical Metallurgy, Chinese Academy of Sciences, Beijing, 100080, China)
    J. Mater. Sci. Technol., 1995, 11 (3): 217-221. 
    Abstract   HTML   PDF (2803KB)
    Solvent extraction of Zr(IV) with TBP in kerosene was used to precipitate precursory zirconia which was then processed to produce ultrafine zirconia powders. The powder prepared was examined and characterized with transmission electron microscopy (TEM) and X-ray diffraction (XRD). Effects of the conditions of preparation on powder properties were especially investigated.It was found the preclpitate was gel-like material with heterogeneous porosity. The gel transformed to polycrystalline particles when calcined to ultrafine powder at 600℃. The composition of the loaded organic phase and the conditions of washing the precipitate are two main factors affecting the properties of powder obtained
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    Dielectric Properties of Some Aldehydes
    I.M.El-Anwnr and I.Z.Selim (Physical Chemistry Dept., National Research Centre, Dokki, Cairo, Egypt)A.A.Foad(Faculty of Science, Helwan University, Helwan, Cairo, Egypt)
    J. Mater. Sci. Technol., 1995, 11 (3): 222-228. 
    Abstract   HTML   PDF (596KB)
    The apparent solution dipole moment, μ, the association factor S, and the correlation parameter g for some aldehydes are calculated at different temperatures. The results are discussed and compared with previous results. The dielectric constant ε' and loss ε" for the investigated aldehydes were measured with different frequencies at 10-50℃. The variation of permittivities with both temperature and frequency is discussed. The relaxation times τ, for some aldehydes were calculated at different temperatures and its values were used in the calculation of the thermodynamic parameters △H and △S
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    Electron Donating Property and Catalytic Activity ofPerovskite-type Mixed oxides (ABO_3) Consisting of Rare Earth and 3d Transition Metals
    S.Sugunant and V.Meera(Dept. of Applied Chemistry, Cochin University of Science and Technology, Kochi-682022, India)
    J. Mater. Sci. Technol., 1995, 11 (3): 229-231. 
    Abstract   HTML   PDF (325KB)
    The catalytic activity of Perovskite-type mixed oxides (LaCoO3, PrCoO3 and SmCoO3) for the reduction of cyclohexanone to cyclohexanol with 2-propanol (Meerwein-PonndorfVerley reduction) has been studied. The data have been correlated with the surface electron donor properties of these mixed oxides
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    Study of Iron-based Surface Composite Materials
    Gongqi SHP; Peidao DING; Shouze ZHOU and Jianxing TANG (Dept. of Metallurgy and Materials Engineering, Chongqing University, Chongqing, 630044, China)
    J. Mater. Sci. Technol., 1995, 11 (3): 232-234. 
    Abstract   HTML   PDF (1140KB)
    new surface infiltrating composite technique has been developed to obtain metal and ceramic composite layer on the surface of metal by traditional casting method. It has been shown that with the new method, a composite layer with a thickness of 2-5 mm can be obtained. The ceramic particulates distribute uniformly in the matrix. The composite layer is very favorable to wear resistance and thermal resistance situations
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ISSN: 1005-0302
CN: 21-1315/TG
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