Strted in 1985 Monthly
ISSN 1005-0302
CN 21-1315/TG
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      28 March 1999, Volume 15 Issue 02 Previous Issue    Next Issue
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    Research Articles
    Formation, Structure and Properties of Bulk Metallic Glasses
    Y.Li
    J. Mater. Sci. Technol., 1999, 15 (02): 97-110. 
    Bulk metallic glasses with up to 72 mm critical section thickness have been obtained by conventional casting techniques and the properties of these materials, particularly the mechanical and magnetic properties have been studied. These materials have been demonstrated to have novel properties, which are fundamentally different from their crystalline counterparts. The recent status of research and development in formation, structure and properties of bulk metallic glasses is reviewed. The techniques to produce such bulk glasses are summarized and the glass forming ability and the critical cooling rate of these materials are discussed. Further consideration of the development and application of this new class of materials will be proposed.
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    Martensitic Transformation in Fe-Mn-Si Based Shape Memory Alloys
    T.Y.Hsu XU Zuyao
    J. Mater. Sci. Technol., 1999, 15 (02): 111-116. 
    The critical driving force for martensitic transformation fcc (γ)→hcp(ε) in ternary Fe-Mn-Si alloys increases with the content of Mn and decreases with that of Si. Thermodynamical prediction of MS in ternary Fe-Mn-Si alloys is established. The fcc (γ)®hcp(ε) martensitic transformation in Fe-Mn-Si is a semi-thermoelastic and the nucleation process does not strongly depend on soft mode. Nucleation occurs directly through an overlapping of stacking fault rather than pole mechanism, and it is suggested that stacking fault energy (SFE) is the main factor controlling nucleation. Based on the phenomenological theory of martensite crystallography, a shuffle on (0001)hcp plane is required when d111¹d0002. The derived principal strain in Bain distortion is smaller, i.e., more reasonable than the values given by Christian. Alloying elements strengthening the austenite, lowering SFE of γ phase and reducing TγN temperature may be beneficial to shape memory effect (SME) of Fe-Mn-Si based alloys. Accordingly, Fe-Mn-Si-RE and Fe-Mn-Si-Cr-N (or Fe-Mn-Si-Ni-Cr-N) are worthy to be recommended as shape memory materials with improved SME.
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    Thermal Stress Behavior of Diffusion-bonded SiC/6061Al Laminates during Thermal Cycling
    Huan LI, Jiabao LI, Zhongguang WANG, Chuanhai JIANG, Dezun WANG
    J. Mater. Sci. Technol., 1999, 15 (02): 117-120. 
    The thermal stress behavior of bonded SiC/6061AL laminates during thermal cycling and the stress relaxation at elevated temperature (205℃) were investigated by means of X-ray diffraction. It was found that the elastic and elastoplastic deformation in the 6061Al layer took place during thermal cycling, and the same closed stress temperature loop was formed in the second cycling for the aged and low temperature treated specimen. Meanwhile, it was demonstrated that the compressive stress relaxed in 6061Al layer at 205℃ within the range of 0.5-16 h, and which was nearly unchanged with further prolongation of time.
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    Simulation of the Iron Smelting-Reduction Process
    K.Sadrnezhaad, A.Simchi
    J. Mater. Sci. Technol., 1999, 15 (02): 121-127. 
    A computer program is developed to simulate a two-step smelting-reduction process. Laws of thermodynamics, kinetics, iron-oxide reduction, energy balance, materials balance and transfer of heat and mass between metal, slag and gas are taken into account for development of the model. Local equilibria between metal and slag according to the quadratic formalism of the regular solution model is considered. Dissolution of iron and its oxides in the molten slag and heat transfer from post combustion gases to the molten bath are numerically analyzed. The model is able to evaluate the effect of all important variables on productivity and effectiveness of the process. Special attention is paid to the operational conditions of the reduction furnace while working with the gases coming from a smelter with a high post-combustion ratio and a high reducing-power produced through reforming of the off-gases of the smelter with a natural gas stream in order to minimize the total energy consumption and to maximize the productivity. The application of the model to optimize the behavior of a two-stage smelting-reduction system is investigated.
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    Calculation and Regulation of Residual Stress Distribution for Superhybrid Composites
    Weihong ZHONG, Deyu CUI, Zhifen GU, Changqi CHEN, Hongyun LI
    J. Mater. Sci. Technol., 1999, 15 (02): 128-132. 
    The distribution of residual stresses of ARALL with different prestresses is calculated by finite element theory. A new method for regulating the residual stress, that is, introducing interim layer between aramid and Al layers, is given out. Applying prestress to the laminate has strong effects on the distribution of normal stress along the fiber direction. The interim layer in fiber direction presents a state with gradient distribution.
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    Microstructural Stability of a Multiphase Ni-25Al-15Cr (at. pct) Intermetallic Alloy
    Rongshi CHEN, Jianting GUO, Jiyang ZHOU
    J. Mater. Sci. Technol., 1999, 15 (02): 133-136. 
    The microstructure of multiphase Ni-25Al-15Cr (at. pct) intermetallic alloy consists of dendritic arms (β-NiAl phase) and interdendritic regions (γ/γ´ two phases) under homogenization followed by air cooling condition. Furnace cooling following homogenization does not significantly influence its microstructure. However, the effects of aging treatment on the microstructure strongly depend on cooling rates following homogenization. A single phase g´ layer with a α-Cr `spouse' layer is observed surrounding the dendritic arms, the formation of this ‘couple’ is attributed to a four-phase invariant quasi-peritectoid, i.e: β+γ=γ´+α-Cr .
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    Influence of Milling Conditions on the Mechanical Alloying of Fe-B Powders
    Yuanzheng YANG, Qiaoshen LI, Youlan ZHU, Xueming MA, Yu, a DONG
    J. Mater. Sci. Technol., 1999, 15 (02): 137-142. 
    Amorphous and nanostructural Fe-B alloys made by mechanical alloying of elemental Fe and amorphous B powders have been studied using X-ray diffraction, differential scanning calorimetry and Mössbauer spectroscopy. It has been shown that the milling conditions have a strong effect on the alloying. The single-phase amorphous alloy, which is limited at nominal composition of Fe60B40, has been produced only by milling in Ar atmosphere and in other composition range the mixture of nanostructure Fe-like phase and Fe2B compound with a little amorphous phase are obtained. While by milling in air atmosphere the introduction of oxygen in air may suppress the formation of amorphous phase, thus the compounds Fe2B may be synthesized with no trace of amorphous phase. The crystallization temperatures of amorphous phase in the resultant products are higher than those of a single amorphous alloy Fe60B40, and hardly independent of the milling conditions and the composition. In addition, it is revealed that detectable B content in the final products is lower than the nominal composition of all the initial samples, which indicates that some B atoms may be located in the disordered interfacial regions of the nanostructural alloyed mixtures.
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    Copper Matrix Composites Reinforced with Nanometer Alumina Particle
    Jianjun WU, Guobin LI, Yun ZHANG, Zhengxing JIANG, Tingquan LEI
    J. Mater. Sci. Technol., 1999, 15 (02): 143-146. 
    The microstructure and properties of the oxide particle dispersion strengthened composite fabricated by internal oxidation method have been studied. Using nitrogen base atmosphere and a new process flow we can improve the quality of the MMCs and decrease the cost of the composites. The size of alumina is in the nanometer order of magnitude and the particles are well distributed. Under the condition of having good electrical conductivity, the composites have 1 to 2 times higher mechanical properties than those of pure Cu.
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    Interface Characterization of the SiCp/Al Composites Made by Powder Metallurgy
    Jianzhong FAN, Kui ZHANG, Likai SHI, Shaoming ZHANG
    J. Mater. Sci. Technol., 1999, 15 (02): 147-150. 
    The interface of the SiCp/Al composites produced by powder metallurgy processing involving hot pressing above the matrix solidus temperature has been investigated by means of TEM. Several kinds of interfaces between the reinforcements and the matrix in the composite, including the clean interfaces, the faceted interfaces and the slight reaction interfaces, are presented. And most of interfaces belong to the slight reaction interfaces which are composed of the Al with different orientation from the Al matrix near the interface zone and particle-like substances produced by MgAl2O4 spinels and impurities.
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    Structure and Stability of TiC/g Interface in Fe-Cr-Ni Base Composite
    Xidong HUI, Yuansheng YANG, Xinqiang WU, Zhifu WANG, Xichen CHEN
    J. Mater. Sci. Technol., 1999, 15 (02): 151-154. 
    The morphology, orientation relationship and stability of TiC/γ interface in Fe-Cr-Ni base composite synthesized with a liquid state in-situ process have been studied. The TiC/γ interface in as-cast sample is of coherent feature. Its orientation relationship is (0-20)γ//(2-20)TiC, [001]γ//[001]TiC. During the aging at 1473 K, the TiC/γ interface may dissolve in matrix and lamellar M23C6 compound may precipitate from γ-matrix.
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    Measurement on Physicochemical Properties of NaCl-KCl-ScCl3 System for Manufacture of Al-Sc Alloy by Molten Salt Electrolysis
    Yanwen TIAN, Benliang SUN, Yuchun ZHAI
    J. Mater. Sci. Technol., 1999, 15 (02): 155-158. 
    The physicochemical properties of the system, such as density, surface tension, specific conductance and melting point were measured. The results were discussed.
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    Studies on Progressive Reactions Leading Formations of Different Types of Barium Ferrites
    H.I.Saleh
    J. Mater. Sci. Technol., 1999, 15 (02): 159-163. 
    The present investigation is concerned with the reaction of barium and iron nitrates mixtures using three different molar ratios, 1:1 (I), 1:2 (II) and 2:1 (III) at different temperatures as pointed out from the DTA data. The reaction products exhibit 12 compounds namely, Ba(NO3)2, α-Fe2O3, Fe3O4, BaFeO3, BaFeO2.9, hexagonal BaFeO3-x, tetragonal BaFeO3-x’,BaFe2O4, α’-BaFe2O4, Ba2Fe6O11, Ba5Fe14O26 and BaFe12O19. The formation of these products depends on the molar ratio between the reactants and the reaction temperature. The reaction products were studied by DTA and TG techniques and characterized by X-ray diffraction patterns, magnetic susceptibility data and scanning electron microscopy, SEM.
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    Dielectric Behavior of Modified Cellulose
    S.A.El-Henawii, S.M.Saad, I.M.El-Anwar
    J. Mater. Sci. Technol., 1999, 15 (02): 164-168. 
    The dielectric constants ε’, the dielectric loss ε” and the activation energy of dielectric relaxation of silylated cellulose were measured within the frequency range 105 to 107 Hz and the temperature range from 10 to 50°C. The test samples were activated cellulose with ethylene diamine, with sodium hydroxide and inactivated cellulose before and after silylation. The measurements were carried out using a multi-deka-meter. Cellulose molecules are more activated by treatment with ethylene diamine than with sodium hydroxide. Generally, silylation causes a marked decrease of the dielectric constant and dielectric loss, meanwhile the silylated samples are affected with the pretreatment of linters with sodium hydroxide and ethylene diamine.
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    Part V: A New Molecular Theory of Non-linear Viscoelasticity for Polymeric Suspensions
    Mingshi SONG, Wen ZHOU, Guixian HU, Lijiang HU
    J. Mater. Sci. Technol., 1999, 15 (02): 169-177. 
    A double-network model is established, which consists of the segments, E and A-constituent chains, the polymeric chains entangled with other ones by multi-entanglement and polymeric chains connected to a great number of destructible particles by multi-adsorption, based on which the E and A-constituent chains can be recreated and released dynamically. The distribution function of the end-to-end vector, the statistical distribution function of conformation for two kinds of chains in the multi-entanglement and multi-adsorption states and their number of polymeric chains are calculated by the combination of statistical mechanics and kinetics. Then the viscoelastic free energies of deformation for two kinds of the networks and suspensions are calculated by Boltzmann's statistical theory. Also, elastic modulus and memory function for two kinds of the network and suspensions are derived. Consequently, a new molecular theory of the non-linear viscoelasticity for polymeric suspensions is proposed, and the constitutive equation and material function with yielding and thinning for the polymeric suspensions in different flow fields are derived from this theory.
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    Photorefractivity of Nematic Liquid Crystals
    Haiguang ZHOU, Zhilin YANG
    J. Mater. Sci. Technol., 1999, 15 (02): 181-183. 
    A theoretical treatment of photo-refractive effect and experimental verifications of the associated nonlinear-optical processes in the nematic phase of liquid crystals are presented. The effect is attributed to the dc space charge fields induced by the photo-charges, which may come from the photo ionization impurities. The phenomenon is analyzed and a theoretical model of photo refractivity in nematic liquid crystals is developed. New experimental results are found to be in good agreement with the theory.
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    Molecular Dynamics Simulation of Zero-Fluence and Low-Bombarding-Energy 63Cu-65Cu Sputtering
    Liping ZHENG, Shi QIU, Yukui ZHOU, Risheng LI
    J. Mater. Sci. Technol., 1999, 15 (02): 184-186. 
    A molecular dynamics simulation has been used to study zero-fluence and low-bombarding-energy 63Cu-65Cu sputtering. Calculations show that the isotopic ratios at both θ≤35° and θ>35°, and the total isotopic ratio increase when the bombarding energy decreases. This result might imply the existence of the bombarding-energy-dependent momentum asymmetry.
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    Preparation and Luminescence Properties of Terbium-Sal Complex In-situ Synthesized in Silica Matrix by a Two-Step Sol-Gel Process
    Lianshe FU, Hongjie ZHANG, Shubin WANG, Qingguo MENG, Hua SHAO, Jiazuan NI
    J. Mater. Sci. Technol., 1999, 15 (02): 187-189. 
    In-situ synthesis of terbium complex with salicylic acid (Sal) in silica matrix was made by a two-step sol-gel process. The terbium complex with salicylic acid was formed in sol-gel derived silica gel, and confirmed by the luminescence excitation spectra and infrared (IR) spectra. As compared to the pure terbium complex powder, the silica gel containing terbium complex exhibits its characteristic emission and presents a longer fluorescence lifetime than that for the pure complex. The luminescence properties of the complex containing silica gel were investigated and compared with that of both terbium doped the silica gel and the pure complex powder. The reasons leading to the above results were also discussed.
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    Synthesis of a Photochromic Bisphenoxynaphthacenequinone Compound by Two-step Method
    Zheng FANG, Jingyu LIU, Lianshe FU, Suxian XU, Tianru FANG
    J. Mater. Sci. Technol., 1999, 15 (02): 190-192. 
    A new photochromic bisphenoxynaphthacenequinone compound, 6,6’-[1-methylethylidenebis (4,1-phenyleneoxy)]bis (5,12-naphthacenequinone) (1), was synthesized by a two-step method, i.e., synthesis of 6-[4-(2-(4-hydroxyphenyl)isopropyl) phenoxy]-5, 12-naphthacenequinone (2) from 6-chloro-5, 12-naphthacenequinone (3) and bisphenol-A, and a further reaction of compound 2 in DMF/acetone mixed solvent in the presence of anhydrous potassium carbonate and potassium iodide. The crude product is obtained in a precipitate form and can easily be purified by recrystallization. The solvent composition has marked influence on the yield of the precipitated crude product in the second step.
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ISSN: 1005-0302
CN: 21-1315/TG
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