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ISSN 1005-0302
CN 21-1315/TG
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      28 May 2000, Volume 16 Issue 03 Previous Issue    Next Issue
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    Research Articles
    Syntheses, crystallographic and magnetic properties of Nd3Fe29-xCrx and other associated compounds
    Xiufeng HAN, Terunobu Miyazaki, Qiyuan WANG, Jun WANG, Yude ZAN, Lanying LIN
    J. Mater. Sci. Technol., 2000, 16 (03): 261-268. 
    Abstract   HTML   PDF (1400KB)
    A systematic study of syntheses and magnetic properties of the Nd-3 Fe29-xCrx (x=4.5, 4.7, 5.0, and 5.5) compounds has been performed. The single-phase compounds of Nd3Fe29-xCrx can be formed in the range 4.5 less than or equal to x less than or equal to 5.5. The Curie temperature Tc, the saturation magnetization M-S at 4.2 K, the anisotropy field H-A at 4.2 K and room temperature, and the intra-sublattice exchange coupling parameter j(FeFe) at 4.2 K for the Nd3Fe29-xCrx compounds decrease with increasing Cr composition from x=4.5 to 5.5, respectively. Nitrogenation and carbonation, unlike hydrogenation, result mainly in improvements of the Curie temperature, the saturation magnetization and the anisotropy field at 4.2 K and room temperature for the Nd3Fe29-xCrx compounds compared with their parent compounds.
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    Study on numerical simulation of mold filling and heat transfer in die casting process
    Liangrong JIA, Shoumei XIONG, Baicheng LIU
    J. Mater. Sci. Technol., 2000, 16 (03): 269-272. 
    Abstract   HTML   PDF (816KB)
    A 3-D mathematical model considering turbulence phenomena has been established based on a computational fluid dynamics technique, so called 3-D SOLA-VOF (Solution Algorithm-Volume of Fluid), to simulate the fluid flow of mold filling process of die casting. In addition, the mathematical model for simulating the heat transfer in die casting process has also been established. The computation program has been developed by the authors with the finite difference method (FDM) recently. As verification, the mold filling process of a S-shaped die casting has been simulated and the simulation results coincide with that of the benchmark test. Finally, as a practical application, the gating design of a motorcycle component was modified by the mold filling simulation and the dies design of another motorcycle component was optimized by the heat transfer simulation. All the optimized designs were verified by the production practice.
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    Carbon segregation of bearing steel concasting billet
    Deguang ZHOU, Jie FU, Ping WANG, Junhao XU, Yaqing XIE, Zheng LI
    J. Mater. Sci. Technol., 2000, 16 (03): 273-276. 
    Abstract   HTML   PDF (669KB)
    The formation mechanism of "white band" and central carbon segregation of high-carbon Cr bearing steel concasting billets are discussed in this paper. The maximum oxygen content in the steel produced by concasting process was 13 x 10(-6) with an average oxygen content of 9.3 x 10(-6) Comparison of metallurgical quality and fatigue property between the concasting steel (CC) and ingot casting steel (IC) showed that the carbon segregation (C/C-0) in former steel was 0.92 similar to 1.10 and its fatigue life was equal to that of the latter steel.
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    Synthesis, microstructure and optical absorption of coatings with doping of nano-TiO2 for protection against ultraviolet irradiation
    Ye ZHANG, Lide ZHANG, Chimei MO, Yuanhong LI, Lianzeng YAO, Weili CAI
    J. Mater. Sci. Technol., 2000, 16 (03): 277-280. 
    Abstract   HTML   PDF (751KB)
    The synthesis of dispersions of MMA (methylmethacrylate) with different concentrations of oleic acid coated nano-TiO2 particles was performed by hydrolysis of TiCl4 in the mixture solutions of MMA, oleic acid and H2O with various concentrations. When MMA :oleic acid : H2O : TiCl4 1.00 : 0.064 : 0.01 : 0.032 (by mol fraction), the dispersion of MMA with oleic acid coated nano-TiO2 particles was very stable. Optical absorption result showed that the absorption band was located in the ultraviolet range from 200 to 400 nm. This dispersion was added to a kind of automobile surface lustering agent (type II), and then this lustering agent with nano-TiO2 was coated on the surface of automobile surface paint. When the doping amount of the dispersion in the lustering agent=10 vol. pet, the state of paint (color and glossiness) did not present any change after irradiation of an ultraviolet lamp with the power of 1000 watt for two days. The sample with surface paint and lustering agent doped by 10 percent dispersion after suffering from irradiation of the sunlight for half a year (from May to November) kept the original state. However, for the samples with automobile paint and lustering agent without doping of nano-TiO2, the color and glossiness lost easily after irradiation of an ultraviolet lamp. These results prove that nano-TiO2 is a kind of high-efficient additive of paint for protection against ultraviolet irradiation.
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    Properties of reactive magnetron sputtered ITO films without in-situ substrate heating and post-deposition annealing
    Meng CHEN, Xuedong BAI, Jun GONG, Chao SUN, Rongfang HUANG, Lishi WEN
    J. Mater. Sci. Technol., 2000, 16 (03): 281-285. 
    Abstract   HTML   PDF (956KB)
    Indium tin oxide (ITO) films were prepared on polyester, Si and glass substrate with relatively high deposition rate of above 0.9 nm/s by DC reactive magnetron sputtering technique at the sputtering pressure of 0.06 Pa system, respectively. The dependence of resistivity on deposition parameters, such as deposition rate, target-to-substrate distance (TSD), oxygen flow rate and sputtering time (thickness), has been investigated, together with the structural and the optical properties. It was revealed that ail 110 films exhibited lattice expansion. The resistivity of ITO thin films shows significant substrate effect: much lower resistivity and broader process window have been reproducibly achieved for the deposition of ITO films onto polyester rather than those prepared on both Si and glass substrates. The films with resistivity of as low as 4.23 x 10(-4) R cm and average transmittance of similar to 78% at wavelength of 400 similar to 700 nm have been achieved for the films on polyester at room temperature.
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    Statistical characteristics of metastable fitting of 316 stainless steel
    Yu ZUO, Haiou DU, Jinping XIONG
    J. Mater. Sci. Technol., 2000, 16 (03): 286-290. 
    Abstract   HTML   PDF (835KB)
    The statistical characteristics of the current fluctuations during metastable pitting of 316L stainless steel in NaCl solution were studied using potentiostatic method. The growth rates and peak currents of metastable pits followed log-normal distributions. As potential and chloride concentration increased, both growth rate and peak current of metastable pits increased. The lifetime of metastable pits also followed log-normal distribution, and was almost not affected by potential. Higher growth rates did not definitely result in larger metastable pits. A certain propagation rate range was found beneficial for the micropit to remain growth. At constant potential, the maximum peak currents in different time intervals during a potentiostatic test followed extreme distribution. The statistical characteristics of metastable pitting may be used to predict the tendency of pitting corrosion.
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    Indole and its derivatives as corrosion inhibitors for C-steel during pickling
    S.H.Sanad, A.A.Ismail, A.A.El-Meligi
    J. Mater. Sci. Technol., 2000, 16 (03): 291-296. 
    Abstract   HTML   PDF (1438KB)
    The corrosion of three types of C-steel in 10% hydrochloric acid solution has been investigated in the absence and the presence of the inhibitors, indole (A), indole acetic acid (B), indole butyric acid (C), and 3-acetyl indole (D), by weight-loss measurements at different temperatures (30 similar to 70 degrees C). The results showed that inhibiting efficiency depended upon the presence of the substituted groups in the pyrrole ring. The inhibiting efficiency of the inhibitors increased in the order: Inh. C References | Related Articles | Metrics
    Effect of carbon on the paramagnetic-antiferromagnetic transition and gamma ->epsilon martensitic transformation of Fe-24Mn alloys
    Xing LU, Zuoxiang QIN, Yansheng ZHANG, Xingyu WANG, Fengxian LI, Bingzhe DING, Zhuangqi HU
    J. Mater. Sci. Technol., 2000, 16 (03): 297-301. 
    Abstract   HTML   PDF (908KB)
    The effect of C content (0.014 similar to 0.39 wt pet) on the paramagnetic-antiferromagnetic transition and gamma --> epsilon martensitic transformation of Fe-24Mn alloys has been investigated by the resistivity, dilation, tensile properties measurement and microstructure examination. The results have shown that C decreases T-N, increases the thermal expansion coefficients both above and below the Tu, increases the resistivity above the TN and antiferromagnetic scattering resistivity below TN. It strongly depresses the gamma --> epsilon martensitic transformation and reduces the Ms of Fe-24Mn alloys. Moreover, it increases the lattice parameter of austenite, enhances the tensile ductility, but almost does not affect the tensile strength. With increasing C content from 0.014 to 0.19 wt pet, the yield strength of Fe-24Mn alloy decreases obviously arising from the decreasing of preexisting epsilon martensite, but it increases from 0.19 to 0.39 wt pet C due to the solution hardening of C.
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    Free volume changes in gamma-irradiated polyethylene and polytetraflourethylene
    Xianyi ZHOU, Linhua ZHAI, Jiangfeng DU, Rongdian HAN
    J. Mater. Sci. Technol., 2000, 16 (03): 302-304. 
    Abstract   HTML   PDF (485KB)
    Positron lifetime spectrum was measured and the change of the free volume was studied for commercial polyethylene (PE) and polytetrafluoroethylene (PTFE) during gamma-irradiation processing up to 265 kGy. The free volume size increases but the crystallinity decreases as irradiation dose increases in PE. Both qualities (free volume size and crystallinity) in PTFE display an opposite behavior. The fractional free volume reduces monotonically with increasing irradiation dose in both PE and PTFE. The competition between the crosslinking and the splitting decomposition in polymers can be used to understand the free volume changes with irradiation dose.
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    Research surveys of electrochemical sensors for in-situ determining hydrogen in steels
    Gang YU, Xueyuan ZHANG, Yuanlong DU
    J. Mater. Sci. Technol., 2000, 16 (03): 305-310. 
    Abstract   HTML   PDF (1118KB)
    The principle, construction and application of two types of electrochemical sensors-amperometric and potentiometric are surveyed. Both types of sensors are very sensitive to changes in temperature. The accuracy of hydrogen measurement depends on both the precision of sensors developed and the reliable technique of installation and security of sensors. The two types of sensors have been used for in-situ determining hydrogen permeated in steels owing to a corrosive reaction, a hydrogen gas circumstance at elevated temperatures and high pressure or also a pretreatment process such as pickling and plating process, etc.
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    Effects of positron diffusion and its application in composite system
    Jian JIANG, Xinzhang ZHOU, ChiWei LUNG
    J. Mater. Sci. Technol., 2000, 16 (03): 311-314. 
    Abstract   HTML   PDF (444KB)
    The effects of positron diffusion on the measured S parameter have been investigated by a point-source diffusion model and a delta function method. Firstly, the theoretical analyses of the effects are presented for the samples of a homogeneous semi-infinite medium and a film of definite thickness. Then the results are used to analyze the S parameters in several composite systems and interface models.
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    Intense photoluminescence and movement of optical absorption edge in alumina aerogels
    Xianting SUN, Lianzeng YAO, Chimei MO, Gang SHI, Weili CAI, Yimin ZHANG, Lide ZHANG
    J. Mater. Sci. Technol., 2000, 16 (03): 315-318. 
    Abstract   HTML   PDF (797KB)
    Alumina aerogels with high porosity of nanometer size were prepared from Al, n-butanol and ethyl acetoacetate by the sol-gel route and the Na supercritical extraction drying technique. Optical experiment results showed that for alumina aerogels after annealing at 500 degrees C for 4 h one intense blue emission band appeared in the wavelength range of 400 to 800 nm, and the optical absorption edge moved from 8.0 eV of coarse grain Al2O3 to 3 similar to 5 eV and with increasing the annealing temperature, this luminescence band presented blue shifts. The reasons of these new optical properties are discussed in detail.
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    Ageing effect on hardness and microstructure of Al-Zn-Mg alloys
    M.Iqbal, M.A.Shaikh, M.Ahmad, K.A.Shoaib
    J. Mater. Sci. Technol., 2000, 16 (03): 319-322. 
    Abstract   HTML   PDF (799KB)
    Experimental results of the investigation on the hardness of two Al-Zn-Mg alloys [Al-10.0 Zn-4.0 Mg and Al-8.5 Zn-3.0 Mg (wt pct)] aged in the temperature range 60 similar to 310 degrees C for different intervals of time from 1/4 h to 168 h are presented. Both the alloys were found to show identical behaviour of hardness with ageing time. Alloy with higher Zn and Mg content had higher hardness than the alloy with lower solute content. There were three ranges of temperature in which different types of precipitates formed and affected the hardness. Some of the grain boundaries were found to migrate and precipitate free zone has been observed.
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    Electrodeposition of Ni-W amorphous alloy and Ni-W-SiC composite deposits
    Zhongcheng GUO, Xiaoyun ZHU, Dacheng ZHAI, Xianwan YANG
    J. Mater. Sci. Technol., 2000, 16 (03): 323-326. 
    Abstract   HTML   PDF (643KB)
    Ni-W alloys and their composite deposits are electroplated on the metals when an appropriate complex agent is selected on the base of the theories of electrochemistry and complex chemistry, and the principle of induced codeposition. Effects of the bath composition, pH value, temperature and current density on the electrode position of Ni-W alloys and their composite deposits have been investigated, and the effect of heat treatment temperature on the hardness, structure and cohesive force of the amorphous Ni-W alloys and their composite deposits are also discussed. Results showed that the alloys containing more than 44 wt pet W content and the composite deposits containing 7.8 wt pet SiC content could be obtained by making use of the appropriate bath composition and plating conditions. Alloys and their composite deposits with over 44 wt pet W content show amorphous structure. The hardness of amorphous Ni-W alloys and their composite deposits increases obviously when heated, and can reach to 1350 HV and 1520 HV respectively for 46 wt pet W content. The cohesion on Cu, carbon steel and stainless steel is very good.
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    Empirical criteria of superconductivity for some oxides
    Xueye WANG, Huang SONG, Guanzhou QIU, Dianzuo WANG
    J. Mater. Sci. Technol., 2000, 16 (03): 327-331. 
    Abstract   HTML   PDF (863KB)
    The properties of superconductivity of some oxides were investigated by structural parametric diagrams or pattern recognition with structural chemical parameters. The essential criteria of superconductivity for some oxides have been obtained by using 109 oxides as the training set and seven parameters as features, the results illustrated that the electronegativity difference is the most important factor among seven parameters. Moreover, the regularity of superconductive transition temperature T-c for complex oxides is discussed by partial least squares (PLS) method.
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    Behavior of medium-frequency core loss in Fe-based nanocrystalline soft magnetic alloys
    Yanzhong ZHANG, Huijuan JIN, Ying SHI
    J. Mater. Sci. Technol., 2000, 16 (03): 332-336. 
    Abstract   HTML   PDF (777KB)
    The dependences of the power loss per cycle on frequency have been investigated in the ranges of 100 Hz less than or equal to f less than or equal to 25000 Hz and 0.1 T less than or equal to B-m < 1.0 T for three main original magnetic states In five sorts of Fe-based nanocrystalline soft magnetic alloys. The measured and calculated results showed that the total power loss per cycle clearly exhibited a nonlinear behavior in the range below 3 kHz similar to 5 kHz depending on both the magnetic state and the value of B-m, whereas it showed a quasi-linear behavior above this range. The total loss was decomposed into hysteresis loss, classical eddy current loss and excess loss, the obvious nonlinear behavior has been confirmed to be completely determined by the dependence of the excess loss on frequency. It has been indicated that the change rate of the excess loss per cycle with respect to frequency sharp decreases with increasing frequency in the range below about 3 kHz similar to 5 kHz, wherease the rate of change slowly varies above this range, thus leading to the quasilinear behavior of the total loss per cycle. in this paper, some linear expressions of the total loss per cycle has been given in a wider medium-frequency segment, which can be used for roughly estimating the total loss.
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    Modeling of the shape forming of composite roll
    Chengsong CUI, Zhenyu LI, Fuyang CAO, Qingchun LI
    J. Mater. Sci. Technol., 2000, 16 (03): 337-340. 
    Abstract   HTML   PDF (596KB)
    A shape modeling of spray formed composite roll, which is utilized to predict the shape and dimension of roll during spray forming process, is developed in this paper. The influences of the principal spray forming parameters, such as the spatial distribution of melt mass flux, spray distance, rotating and translating speeds of substrate bar etc., on the geometry and dimension of spray formed product were investigated.
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    Flow behavior and evolution of microstructure during hot deformation for a high Mo stainless steel
    Yourong XU, Liangsheng CHEN, Deying WANG, Lei JIN
    J. Mater. Sci. Technol., 2000, 16 (03): 341-344. 
    Abstract   HTML   PDF (1155KB)
    The mechanical behaviors of high Mo austenitic stainless steel 00Cr20Ni18Mo6Cu[N] have been investigated using the methods of hot compression simulation test on the Thermecmaster-Z simulator. The dynamic recrystallization kinetic equation was established, Avrami coefficient n lies in between 0.9 similar to 2 depending on deformation parameters. A perfect flow stress model considering dynamic recrystallization was also established. Dynamic recrystallization tends to complete at 1050℃ and high strain rate, but at temperature below 950℃, it is hard to occur. Double-stage interrupt compression tests were carried out. Activation energy for static and metadynamic recrystallization have been obtained respectively (Q(SRX)=483.7, Q(MDRX)=253.5 kJ/mol). Avrami coefficient of MDRX is about 0.5, and t(0.5)-kinetics equations of SRX and MDRX have also been constructed. The evolution of microstructures during interrupt compression deformation was investigated. Static and metadynamic recrystallization is essential to improve plasticity, at temperature above 1000℃ increasing interpass time has advantage for static and metadynamic recrystallization.
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    Crystallization growth of single crystal Cu by continuous casting
    Zhenming XU, Jianguo LI, Hengzhi FU
    J. Mater. Sci. Technol., 2000, 16 (03): 345-347. 
    Abstract   HTML   PDF (461KB)
    Crystallization growth of single-crystal Cu by continuous casting has been investigated using self-designed horizontal continuous casting equipment and XRD. Experimental results showed that the crystallization plane of (311), (220) and (111) were eliminated sequentially in evolutionary process. The final growth plane of crystal was (200), the direction of crystallization was [100], the growth direction of both sides of the rod inclined to axis, and the degree of deviation of direction [100] from the crystal axis was less than 100. In order to produce high quality single crystal, the solid-liquid interface morphology must be smooth, even be planar.
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    Composition control of alloy coatings and composition design of cathode targets in multi-arc ion plating
    Jun ZHANG
    J. Mater. Sci. Technol., 2000, 16 (03): 348-350. 
    Abstract   HTML   PDF (526KB)
    The composition from alloy cathode target to alloy coating generally changes to some extent in multi-are ion plating. This demixing effect leads to the difficulties in the control of alloy composition of coating and in the design of composition of alloy cathode target. A new simple formula, a(n) = [(a(n)(o) . f(n))/Sigma(i)(a(i)(o) . f(i))].100%, is proposed in present work to deal with the problem. According to this formula, the composition of alloy coating can be calculated by means of the degrees of ionization of alloy elements. The results of calculation agree with the experimental ones within very limited error range. Modifying the formula into another form, a(n)(o) = [(a(n)/f(n))/Sigma(i)(a(i)/f(i))].100%, the design for alloy composition of cathode target can be conveniently carried out, and the ideal composition of alloy coating can be obtained.
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    Selenium doping in Bi-based superconductors
    Affia Aslam, S.A.Siddiqi, J.A.A.Khan, R.Shaheen
    J. Mater. Sci. Technol., 2000, 16 (03): 351-353. 
    Abstract   HTML   PDF (537KB)
    Six different compositions in Bi2Sr2Ca2Cu3Oy:Se-x with x=0.0, 0.05, 0.1, 0.2, 0.3, 0.4 have been prepared by the solid state reaction method to explore doping of selenium in the system. Sintering at 847+/-4 degrees C and subsequent annealing at 827 degrees C has been carried out for different time periods. The samples have been characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), and measurement of resistance below room temperature has been carried out by four-probe method. Superconducting transition temperature (T-c) value shows dependence on Se concentration: the highest T-c(0)=94 K is observed for x=0.3. A detailed Auger electron spectroscopic (AES) analysis has been carried out to investigate the presence of Se in the grains of the superconductors. It has also been found that Se increases the T-c(0) value and promotes the formation of high temperature superconducting phase (2223), which coexists with low temperature phase (2212) in the sintered samples.
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    Calculation of interaction parameters from immiscible phase diagram of alkali metal or alkali earth metal-halide system by means of subregular solution model
    Zhaochun ZHANG, Deliang CUI, Baibiao HUANG, Xiaoyan QIN, Minhua JIANG
    J. Mater. Sci. Technol., 2000, 16 (03): 354-356. 
    Abstract   HTML   PDF (0KB)
    The calculation of the model parameters, lambda(11), lambda(12), lambda(21) and lambda(22), was carried out numerically from the phase diagrams for 11 alkali metal-alkali halide or alkali earth metal-halide systems. In addition, artificial neural network trained by known data has been used to predict the values of these model parameters. The predicted results are in good agreement with the calculated ones. The applicability of the subregular solution model to the alkali metal-alkali halide or alkali earth metal-halide systems were tested by comparing the available experimental composition along the boundary of miscibility gap with the calculated ones which were obtained by using genetic algorithm. The good agreement between the calculated and experimental results across the entire liquidus is valid evidence in support of the model.
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ISSN: 1005-0302
CN: 21-1315/TG
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