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ISSN 1005-0302
CN 21-1315/TG
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      28 July 2003, Volume 19 Issue 04 Previous Issue    Next Issue
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    Research Articles
    Effect of Phosphorus on Stress Rupture Properties of GH4133 Ni-Base Superalloy
    Wenru SUN, Shouren GUO, Baiyun TONG, Dezhong LU, Yan XU, Xiaona MENG, Na LI, Zhuangqi HU
    J. Mater. Sci. Technol., 2003, 19 (04): 289-291. 
    Abstract   HTML   PDF (1330KB)
    The effect of phosphorus on the stress rupture property of GH4133 alloy has been investigated and is compared with that of IN718 alloy. The GH4133 alloy is crept by dislocation movement. Phosphorus has a tendency to prolong the rupture life of some wrought superalloys by inhibiting the dislocation movement. If the phosphorus addition is too high, its effect on impairing the grain boundary cohesion overwhelms that on inhibiting the dislocation movement, and the life of the GH4133 alloy can be shortened. The two functions of inhibiting the dislocation movement and impairing the grain boundary cohesion determine that the optimum phosphorus content in the GH4133 alloy is around 0.011 wt pct. Phosphorus exhibits a greater effect on prolonging the rupture life of IN718 alloy than that of GH4133 alloy. The two alloys are crept by different mechanisms. The intergranular phosphorus-bearing phase is precipitated in the IN718 alloy, while not in the GH4133 alloy. The precipitation of the phosphorus bearing phase can balance the phosphorus segregation at the grain boundaries and allows a more remarkable effect of phosphorus on extending the rupture life of IN718 alloy.
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    Tribological Properties of Mo-N Hard Coatings on Ti6Al4V by Double Glow Discharge Technique
    Xiuyan LI, Bin TANG, Junde PAN, Daoxin LIU, Zhong XU
    J. Mater. Sci. Technol., 2003, 19 (04): 291-293. 
    Abstract   HTML   PDF (777KB)
    Mo-N hard coatings on Ti6Al4V were formed using double glow discharge technique. The fundamental coating properties, such as the phase, hardness and elastic modulus were investigated. The tribological performances of the coatings in dry wear condition were studied by means of ball-on-disc wear machine. The experimental results showed that the thickness of the Mo-N hard coating was about 10 µm. The coating was single fcc γ-Mo2N phase with (200) preferred orientation. The hardness and the elastic modulus of the coating was 13.80 GPa and 261.65 GPa respectively. The surface treatment enhanced the hardness and elastic modulus of the surface of Ti6Al4V base greatly. With GCr15 slider ball, the friction coefficient of the Mo-N hard coating was in the range of 0.56~0.65 at the steady state. Though the coating did not show friction reducing effect, it improved the wear resistance of Ti6Al4V greatly.
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    Non-Local Analysis of Forming Limits of Ductile Material Considering Void Growth
    Youngsuk Kim
    J. Mater. Sci. Technol., 2003, 19 (04): 294-299. 
    Abstract   HTML   PDF (1472KB)
    The current study performed a finite element analysis of the strain localization behavior of a voided ductile material using a non-local plasticity formulation in which the yield strength depends on both an equivalent plastic strain measurement (hardening parameter) and Laplacian equivalent. The introduction of gradient terms to the yield function was found to play an important role in simulating the strain localization behavior of the voided ductile material. The effect of the mesh size and characteristic length on the strain localization were also investigated. An FEM simulation based on the proposed non-local plasticity revealed that the load-strain curves of the voided ductile material subjected to plane strain tension converged to one curve, regardless of the mesh size. In addition, the results using non-local plasticity also exhibited that the dependence of the deformation behavior of the material on the mesh size was much less sensitive than that with classical local plasticity and could be successfully eliminated through the introduction of a large value for the characteristic length.
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    Preparation of Scratch-Resistant Nano-Porous Silica Films Derived by Sol-Gel Process and Their Anti-reflective Properties
    Guangming WU, Jun SHEN, Tianhe YANG, Bin ZHOU, Jue WANG
    J. Mater. Sci. Technol., 2003, 19 (04): 299-302. 
    Abstract   HTML   PDF (1288KB)
    Structural strengthening of the nano porous silica films has been reported. The films were prepared with a base/acid two-step catalyzed TEOS-based sol-gel processing and dip-coating, and then baked in the mixed gas of ammonia and water vapor. The silica films were characterized with TEM, AFM, FTIR, spectrophotometer, ellipsometer, and abrasion test, respectively. The experimental results have shown that the films have a nanostructure with a low refractive index and can form an excellent scratch-resistant broadband anti-reflectance. The two-step catalysis noticeably strengthens the films, and the mixed gas treatment further improves mechanical strength of the silica network. Finally the strengthening mechanism has been discussed.
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    Non-uniform Stress Field and Stress Concentration Induced by Grain Boundary and Triple Junction of Tricrystal
    Jiansong WAN, Zhufeng YUE
    J. Mater. Sci. Technol., 2003, 19 (04): 303-308. 
    Abstract   HTML   PDF (2304KB)
    The stress characteristics in the anisotropic bicrystal and tricrystal specimens were analyzed using the anisotropic elastic model, orthotropic Hill$'$s model and rate-dependent crystallographic model. The finite element analysis results show that non-uniform stresses are induced by the grain boundary. For bicrystal specimens in different crystallographic orientations, there exist stress concentrations and high stress gradients nearby the boundaries. The activation and slipping of the slip systems are dependent on the crystallographic orientations of the grains and also on the relative crystallographic orientations of the two adjoining grains. For the tricrystal specimens, there is not always any stress concentrations in the triple junction, and the concentration degree depends on the relative crystallographic orientations of the three grains. Different from the bicrystal specimens, there may be or no stress concentration in the vicinity of grain boundaries for the tricrystal specimens, which depends on the relative crystallographic orientations of the three grains. The stress concentration near to the grain boundaries and triple junction can be high enough for the local plastic deformation, damage and voiding or cracking even when the whole specimen is still under the elastic state. It can be further concluded that homogeneous assumption for polycrystalline materials is not suitable to study the detailed meso- or micro-mechanisms for damaging and fracturing.
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    Three Dimension Monte Carlo Simulation of Austenite Grain Growth in CGHAZ of an Ultrafine Grain Steel
    Dong CHEN, Yongping LEI, Xiaoyan LI, Yaowu SHI, Zhiling TIAN
    J. Mater. Sci. Technol., 2003, 19 (04): 309-312. 
    Abstract   HTML   PDF (1343KB)
    In the present research Monte Carlo technique was used to simulate the grain growth in heat-affected zone(HAZ) of an ultrafine grain steel. An experimental data based (EBD) model proposed by Gao was used to establish the relation between tMCS and real time temperature kinetics in our simulation. The simulations give out the evolution of grain structure and grain size distribution in HAZ of the ultrafine grain steel. A Microsoft Window based on computer program for the simulation of grain growth in the HAZ of weldment in three dimensions has been developed using Monte Carlo technique. For the system, inputting the temperature field data and material properties, the evolution of grain structure, both image of simulated grain structure and numerical datum reflecting grain size distribution can be produced by the program. The system was applied to the ultrafine grain steel welding, and the simulated results show that the ultrafine grain steel has large tendency of grain growth.
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    A Mathematical Model for Forecasting Distortion of Workpieces with Phase Transformation on Cooling Process
    Jiansong YE, Yikang LIU, Yuanjun ZHOU
    J. Mater. Sci. Technol., 2003, 19 (04): 313-316. 
    Abstract   HTML   PDF (618KB)
    A temperature phase transformation stress coupled 3D nonlinear mathematical model has been proposed for forecasting distortion of workpieces on the cooling processes in this paper. Moreover, a series of subroutines were developed on the MARC (analysis research corporation) software platform and the simulation result is basically identical with the experimental one that measured on the workpiece shape with LEITZ equipment. This verifies that the mathematical model and method are feasible.
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    Numerical Simulation of Mechanical Behaviors of the TiNi Shape Memory Alloy Welded Joints in the Precise Pulse Resistance Butt-Welding
    Lijun HAN, Junjie ZHU, Lihong HAN
    J. Mater. Sci. Technol., 2003, 19 (04): 317-320. 
    Abstract   HTML   PDF (791KB)
    The hysteresis unit system was introduced to mechanical structure behavior of the TiNi SMA joint based on the structure characteristics of the martensite variants in the joints, and some functions reflecting its inner structure characteristics and micro-behavior such as density function, phase transformation function were set up from micropoints. Finally, the structure behavior relationship and corresponding mathematic model reflecting the relationship among hysteresis strain, stress and phase transformation strain were provided, which could predict the stress-strain behavior of the TiNi SMA joint to large extent.
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    Expert Network for Die Casing Defect Analysis
    Jiadi WANG, Yongfeng JIANG, Chen LU, Wenjiang DING
    J. Mater. Sci. Technol., 2003, 19 (04): 320-323. 
    Abstract   HTML   PDF (818KB)
    Due to the competition and high cost associated with die casting defects, it is urgent to adopt a rapid and effective method for defect analysis. In this research, a novel expert network approach was proposed to avoid some disadvantages of rule-based expert system. The main objective of the system is to assist die casting engineer in identifying defect, determining the probable causes of defect and proposing remedies to eliminate the defect. 14 common die casting defects could be identified quickly by expert system on the basis of their characteristics. BP neural network in combination with expert system was applied to map the complex relationship between causes and defects, and further explained the cause determination process. Cause determination gives due consideration to practical process conditions. Finally, corrective measures were recommended to eliminate the defect and implemented in the sequence of difficulty.
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    FEM Simulation of Bending Formability for Laminate Steel/Resin/Steel Lightweight Composite Sheet
    Guancheng LI, Yonglin KANG
    J. Mater. Sci. Technol., 2003, 19 (04): 324-326. 
    Abstract   HTML   PDF (613KB)
    The ANSYS simulation software was used to analyze the bending formability of laminate steel/resin/steel lightweight composite sheet. The skin steel at external side produces relative slipping-off change during the bending due to its composite structure. The internal stress strain states, materials effect tools parameters and intermediate layer resin of lightweight sheet on slipping-off change were analyzed. The spring back and shear stress state after bending have also been discussed.
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    Numerical Simulation of Reaction-Diffusion during Carburization of HK40 Steel
    Meili ZHU, Qiang XU, Junshan ZHANG
    J. Mater. Sci. Technol., 2003, 19 (04): 327-330. 
    Abstract   HTML   PDF (797KB)
    Two types of carbides M23C6 and M7C3 precipitate orderly as carbon concentration in a high Cr-Ni austenitic steel increases during carburization process. The mathematical model that describes diffusion of carbon and the precipitation of M23C6 and M7C3 has been studied. A criterion to judge when the transformation of M23C6 to M7C3is over and M7C3 precipitates directly has been given in simulated calculation. By applying the model, the carburization of HK40 steel has been calculated by means of finite difference computation techniques. The pack carburization tests for the HK40 steel have been carried out at 1273 K. The comparison between the experimental and the calculated results show acceptable agreement.
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    Influences of Alloying Elements W, Mo, Cr and Nb on Retained Beta Phase in 47Al Based near γ-TiAl Alloys
    Limin DONG, Rui YANG
    J. Mater. Sci. Technol., 2003, 19 (04): 330-333. 
    Abstract   HTML   PDF (1325KB)
    The influences of alloying elements W, Mo, Cr, and Nb on retained β phase in 47Al based near γ-TiAl alloys have been studied. The results reveal that the amount of retained β phase is increased by the addition of Cr, Mo, W in rising rank, although the distribution of β phase in Cr-bearing alloys is different from that of Mo- or W-bearing alloys. For Nb-doped alloys, no retainedβwas found even when 5 at.pct Nb was added. The as-cast microstructural features and the distribution of theβphase in the different alloy families were compared and interpreted in terms of the different segregation behaviour of these elements in Ti.
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    Surface Reaction of TiAl with Water Vapor and Oxygen
    Yexin CHEN, Xiaojing WAN, Weixin XU
    J. Mater. Sci. Technol., 2003, 19 (04): 334-336. 
    Abstract   HTML   PDF (615KB)
    The interaction of water vapor and oxygen with TiAl-based alloy has been studied with Auger electron spectroscopy and X-ray photoelectron spectroscopy. The results indicate that both surface reactions initiate at a very short exposure (about 6×10(-7) Pa·s) and the oxides Al2O3 and TiO2 form in the surface reactions. In the oxidizing reaction, the water vapor reacts firstly with Al, and then reacts with Ti after certain exposure. The surface reaction of Al with water vapor may be responsible for the environmental embrittlement at room temperature in TiAl-based alloy.
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    Processing and Performance of Alumina Fiber Reinforced Alumina Composites
    P.Y.Lee, T.Uchijima, T.Yano
    J. Mater. Sci. Technol., 2003, 19 (04): 337-340. 
    Abstract   HTML   PDF (1035KB)
    Processing of alumina fiber-reinforced alumina matrix composites by hot-pressing was described. The mechanical properties of the composites fabricated by different sintering conditions including temperature and pressure have been investigated. The results indicated that the higher sintering temperature and pressure corresponded to the higher bulk density and higher maximum strength of the composite, whereas the pseudo-ductility of the composite was lower. The preliminary results of the composite with monazite-coated fibers showed that maximum strength could be improved up to 35% compared with the noncoated fiber composite in the same sintering condition. Moreover, the fracture behavior of the composite changed from completely brittle fracture to non-brittle fracture under the suitable sintering conditions. SEM observation of the fracture surface indicated that the coating worked as a protective barrier and avoided sintering of the fibers together even at high temperature and pressure during densification process.
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    Microstructural Characteristics of Underwater Shock Consolidated Aluminum Composites
    K.Raghuk, an, K.Hokamoto, J.S.Lee, A.Chiba, B.C.Pai
    J. Mater. Sci. Technol., 2003, 19 (04): 341-345. 
    Abstract   HTML   PDF (1822KB)
    Metal matrix composites (MMCs) offer extra strength and high temperature capabilities in comparison with unreinforced metals. Aluminum composites possess higher stiffness, strength, fatigue properties and low weight advantages. Carbon fiber reinforced Al composites (Al-Cf) and silicon carbide particulate reinforced Al composites (Al-SiCp) were shock densified using axisymmetric assemblies for underwater explosions. Unidirectional planar shock waves were applied to obtain uniform consolidation of the composites. The energy generator was a high explosive of 6.9 km/s detonation velocity. Irregular morphological powders of Al were the base material. The reinforcement ratio was 15 Vol. pct for Al-Cf composites and 30 Vol. pct for Al-SiCp composites. The microstructural and the strength characteristics of the shock consolidated Al composites are reported.
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    Cavitation Erosion Behavior of CrMnN Duplex Stainless Steel in Distilled Water and 3% NaCl Solution
    Suzhen LUO, Yugui ZHENG, Wei LIU, Heming JING, Zhiming YAO, Wei KE
    J. Mater. Sci. Technol., 2003, 19 (04): 346-350. 
    Abstract   HTML   PDF (2784KB)
    The cavitation erosion (CE) behavior of CrMnN ferrite-austenite duplex stainless steel in distilled water and 3% NaCl solution was investigated by using a magnetostrictive-induced CE facility. The damaged surfaces were observed by scanning electron microscope (SEM). It was found that the CE resistance of CrMnN steel was higher than that of 0Cr13Ni5Mo steel. The mass loss rate of CrMnN steel in distilled water was similar to that in 3% NaCl except at the early stage of CE. The failure mode of ferrite phase was brittle fracture, which had adverse effect on the resistance to CE, while the failure of austenite phase was a ductile failure in CrMnN steel. The excellent resistance to CE was related to the good mechanical properties of austenitic phase and the consumption of CE energy by plastic deformation involving slip and twinning.
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    Effects of Alloying Elements on Microstructure and Erosion Resistance of Fe-C-Cr Weld Surfacing Layer
    Daqian SUN, Wenquan WANG, Zhaozhi XUAN, Yue XU, Zhenfeng ZHOU
    J. Mater. Sci. Technol., 2003, 19 (04): 351-354. 
    Abstract   HTML   PDF (829KB)
    Effects of alloying elements on microstructure and erosion resistance of Fe-C-Cr weld surfacing layer have been studied. The experimental results show that increasing C and Cr content favors improving the erosion resistance of the layer, and the excessive C and Cr result in decreasing the erosion resistance at 90 deg. erosion. That Mo, Nb or Ti improves the erosion resistance of Fe-C-Cr weld surfacing layer is mainly attributed to increasing the amount of M7C3 and forming fine NbC or TiC in austenite matrix, but the excessive Mo, Nb or Ti is unfavorable. The addition of Mo, Nb and Ti in proper combination possesses stronger effect on improving the erosion resistance and the erosion resistance (ε A) of Fe-C-Cr weld surfacing layer with fine NbC, TiC and M7C3 distributing uniformly in austenite matrix obviously increases to 2.81 at 15 deg. erosion and 2.88 at 90 deg. erosion when the layer composition is 3.05C, 20.58Cr, 1.88Mo, 2.00Nb and 1.05Ti (in wt pct).
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    Combustion Synthesis of Ti-2B-Cu/Ni and 3Ti-2BN-Cu/Ni Bilayered Cermets
    Weiping SHEN, Wenbin CAO, Changchun GE, E.H.Grigoryan, A.E.Sytschev, A.S.Rogachev
    J. Mater. Sci. Technol., 2003, 19 (04): 355-359. 
    Abstract   HTML   PDF (1152KB)
    The effects of Cu and Ni (x=0, 10, 20 and 40 wt pct) and compaction pressures (12, 24, 84 and 108 MPa) on combustion wave velocity and wave front shape for Ti-2B-Cu/Ni and 3Ti-2BN-Cu/Ni bilayered cermets were investigated by a video camera. Since the boiling point of Cu is lower, the wave velocities of specimens are slower. Due to the higher specific heat of Ni than that of Cu, the wave velocities of specimens was slowed down a lot with increasing the Ni diluent. The wave velocity differences of the specimens containing Ni are more than that of the bilayered specimens containing Cu. Wave velocities of the specimens containing Ni increased more than that of the specimens containing Cu when higher pressure was employed for green mixture. The more the wave velocity difference of the bilayer, the more curved the specimen.
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    Co3+-modified Surface of LiMn2O4 Spinel for its Improvement of Electrochemical Properties
    Zishan ZHENG, Zilong TANG, Zhongtai ZHANG, Junbiao LU, Wanci SHEN
    J. Mater. Sci. Technol., 2003, 19 (04): 359-362. 
    Abstract   HTML   PDF (888KB)
    Cobalt was used to modify the surface of spinel LiMn2O4 by a solution technique to produce Co3+-modified surface material (COMSM). Cobalt was only doped into the surface of LiMn2O4 spinel. XPS(X-ray photoelectron spectroscopy) analysis confirms the valence state of Co3+. COMSM has stable spinel structure and can prevent active materials from the corrosion of electrolyte. The ICP(inductively coupled plasma) determination of the spinel dissolution in electrolyte showed the content of Mn dissolved from COMSM was smaller than that from the pure spinel. AC impedance patterns show that the charge-transfer resistance (Rct) for COMSM is smaller than that for pure spinel. The particles of COMSM are bigger in size than those of pure spinel according to the micrographs of SEM(scanning electron microscopy). The determinations of the electrochemical characterization show that COMSM has both good cycling performance and high initial capacity of 124.1 mA/h at an average capacity loss of 0.19 mAh/g per cycle.
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    Characterization of ZnO:Al Films Deposited on Organic Substrate by r.f. Magnetron Sputtering
    Jin MA, Xiaotao HAO, Shiyong ZHANG, Honglei MA
    J. Mater. Sci. Technol., 2003, 19 (04): 363-365. 
    Abstract   HTML   PDF (695KB)
    Transparent conducting Al-doped zinc oxide (ZnO:Al) films with good adhesion have been deposited on polyimide thin film substrates by r.f. magnetron sputtering technique at low substrate temperature (25~180℃). The structural, optical and electrical properties of the deposited films were investigated. High quality films with electrical resistivity as low as 8.5×10-4 w\c·cm and the average transmittance over 74% in the wavelength range of the visible spectrum have been obtained. The electron carrier concentrations are in the range from 2.9×1020 to 7.1×1020 cm-3 with mobilities from 4 to 8.8 cm2V-1s-1 The densities of the films are in the range from 4.58 to 5.16 g/cm-3.
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    Carrier Density and Plasma Frequency of Aluminum Nanofilms
    Hao DU, Jun GONG, Chao SUN, Rongfang HUANG, Lishi WEN, W.Y.Cheung, S.P.Wong
    J. Mater. Sci. Technol., 2003, 19 (04): 365-367. 
    Abstract   HTML   PDF (619KB)
    In this work, the prerequisite and mode of electromagnetic response of Al nanofilms to electromagnetic wave field was suggested. Reflectance, transmittance in infrared region and carrier density of the films was measured. With the carrier density of the films, the dependence of their plasma frequencies on the film thickness was obtained. On the other hand, the dependence of absorptance on the frequency of electromagnetic wave field was set up by using the measured reflectance and transmittance, which provided plasma frequency---film thickness relation as well. Similarity of both plasma frequency---film thickness relations proved plasma resonance as a mode of electromagnetic response in Al nanofilms.
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    Deposition of Aluminium Oxide Films by Pulsed Reactive Sputtering
    Xinhui MAO, Bingchu CAI, Maosong WU, Guoping CHEN
    J. Mater. Sci. Technol., 2003, 19 (04): 368-370. 
    Abstract   HTML   PDF (612KB)
    Pulsed reactive sputtering is a novel process used to deposit some compound films, which are not deposited by traditional D.C. reactive sputtering easily. In this paper some experimental results about the deposition of Al oxide films by pulsed reactive sputtering are presented. The hysteresis phenomenon of the sputtering voltage and deposition rate with the change of oxygen flow during sputtering process are discussed.
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    Investigation of Peak Separation for X-ray Diffraction Profiles of Spinodal Decomposition by a Kind of Optimized Voigt Function
    Liuding WANG, Junqiang ZHOU, Quanxi CAO, Zhao CHEN
    J. Mater. Sci. Technol., 2003, 19 (04): 371-373. 
    Abstract   HTML   PDF (622KB)
    The intensity and position of sidebands (satellites) on both sides of main diffraction peak in a great number of X-ray diffraction profiles of alloys always change with progress of aging. The sidebands position is determined by a newly optimized Voigt function in present investigation. Furthermore, for Cu-4 wt pct Ti alloy aged at 400℃ for 720 min and 1080 min, after introducing the weight factor of above two satellites intensity, the relative error between the fitting curves and X-ray diffraction profiles is less than 0.185%, which is more precise than the previously calculating result.
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    Investigation of Subboundaries Evolution in Superplastically Deformed NiAl by Positron Lifetime
    Xinghao DU, Jianting GUO, Bide ZHOU, Liangyue XIONG
    J. Mater. Sci. Technol., 2003, 19 (04): 373-375. 
    Abstract   HTML   PDF (671KB)
    In order to study the subboundaries evolution in superplastically deformed NiAl, the positron lifetime change during superplastic deformation process was measured. It is shown that the superplastic deformation of NiAl has not influence on its τ2, the newly recrystallized grain boundaries formed during entire superplastic deformation process belong to the calegory of subboundaries and have not contribution to the superplastic strain.
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    Formation Mechanism of Microstructure of Melt Spun Al-In Immiscible Alloys
    Yuan LIU, Yanxiang LI, Jingjie GUO, Jun JIA
    J. Mater. Sci. Technol., 2003, 19 (04): 376-378. 
    Abstract   HTML   PDF (1152KB)
    Immiscible alloys are attractive for their valuable physical and mechanical properties. In this paper, Al-In immiscible alloy is prepared by melt spinning process and its morphological evolution is studied at various indium contents. The results show that the morphologies of the matrix phase depend on the indium content. Different morphologies lead to different distribution of the second phase particles. Due to a particular solidification mechanism of immiscible alloys, even under the melt spinning rapid solidification condition, it is still impossible to produce homogeneous Al-In hypomonotectic alloy ribbons. But for Al-In hypermonotectic alloys, there is almost no segregation of the second phase throughout the cross section of the ribbons.
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    Hot Deformation Behavior of an As-cast Duplex Stainless Steel
    Pingli MAO, Ke YANG, Guoyue SU
    J. Mater. Sci. Technol., 2003, 19 (04): 379-381. 
    Abstract   HTML   PDF (735KB)
    The hot deformation behavior of an as-cast 0Cr17Mn14Mo2N duplex stainless steel has been studied by hot compression test at the temperature range from 1000℃ to 1200℃, and the strain rates are 0.1 s-1, 1 s-1 and 5 s-1, respectively. It was found that during hot deformation there is only dynamic recovery taking place within the δ-ferrite phase, but the γ-austenite phase undergoes dynamic recrystallization. The activation energy of the steel for hot compression is estimated to be 480 kJ/mol.
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    Investigation on Superplasticity in SiCp/2024 Cold Rolling Sheet after Heat Treatment
    Bolv XIAO, Zongyi MA, Jing BI
    J. Mater. Sci. Technol., 2003, 19 (04): 382-384. 
    Abstract   HTML   PDF (848KB)
    High strain rate superplastic deformation behavior of powder metallurgy (PM) processed 17 vol. pct SiCp/2024 Al composite sheet after heat treatment was investigated over a range of temperature from 753 to 833 K. At 813 K, a maximum elongation of 259% was discovered at a strain rate of 10-1s-1. The activation energy was closed to that for lattice diffusion of Al and increased at temperature upon incipient melting temperature. The mechanism of superplastic deformation for present composites was attributed to lattice diffusion controlled grain boundary sliding.
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