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      28 May 1992, Volume 8 Issue 3 Previous Issue    Next Issue
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    Surface Characterization of Ni_(64)P_(20)Fe_(16)Amorphous Alloy by X-ray Photoelectron Spectroscopy and Auger Electron Spectroscopy
    By JIANG Honggang WANG Jingtang DING Bingzhe State Key Laboratory for RSA,Institute of Metal Research,Academia Sinica,Shenyang,110015,ChinaTo whom correspondence should be addressed
    J. Mater. Sci. Technol., 1992, 8 (3): 157-162. 
    Abstract   HTML   PDF (547KB)
    The nature of the native oxides formed on the surface layer of amorphous alloy Ni_(64)P_(20)Fe_(16)has been studied by X-ray photoelectron spectroscopy (XPS)and Auger electron spectroscopy(AES)with depth profiling by ion bombardment.There are great distinctions in compositions and chemical states between the surface layer and the bulk.The main constituents Ni,P and Fe are lower in the sur- face layer,and they are mostly in oxidized states, whereas C,O and N are enriched in the surface lay- er.The thickness of surface oxide layer is approximately 20 nm,this layer was assumed to be of great significance to various properties of amor- phous alloy Ni_(64)P_(20)Fe_(16),expecially to the chemical and catalytic properties.Experiments proved that transitional element Fe cannot improve oxidation resistance of the amorphous Ni-P system.
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    Effect of Phosphates on the Metal Ion Activated Surface Complexes at the SiO_2-H_2O Interface and in Quartz Deactivation in Flotation System
    SUN Zhongxi W. Forsling CHEN Jin Division of Inorganic Chemistry,Lulea University of Technology,S-951 87 Lulea,SwedenDept.of Mineral Engineering,Central South University of Technology,Changsha,410083,ChinaTo whom correspondence should be addressed
    J. Mater. Sci. Technol., 1992, 8 (3): 163-172. 
    Abstract   HTML   PDF (746KB)
    The complexation of phosphates in the quartz-metal ion-H_2O-oleate system was studied. Computer assisted calculations with the aid of the advanced program SOLGASWATER and known equilibrium constants were used to evaluate the mechanism,The calculation results revealed that in the presence of a certain amount of phosphates, metal ions adsorbed at the quartz-H_2O interface will be transferred into solution.Thus the competi- tion for metal ions between phosphates and the quartz surface leads to surface deactivation and re- duced floatability.Various distribution diagrams clearly demonstrate the change of surface complexation as a function of added phosphate concentration.The deactivation products were also evaluated.
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    Dislocation Inelastic Effects in Zinc Single Crystals
    V.Ya.Platkov I.K.Nosolev Physico-Technical Institute of Low Temperatures,Academy of Sciences of the Ukraine,Kharkov.Donetsk Physico-Technical Institute,Academy of Sciences of the Ukraine,Donetsk.To whom correspondence should be addressed
    J. Mater. Sci. Technol., 1992, 8 (3): 173-176. 
    Abstract   HTML   PDF (426KB)
    Dislocation internal friction,elastic modulus defect and their ratio r have been studied in an- nealed and plastically deformed Zn single crystals in the temperature range of 80 to 300 K in a wide range of oscillation amplitudes.The results ob- tained are discussed within the present notion about the nature of dissipative elastic oscillation losses in solids.
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    Temperature and Stress Dependence of Occurrence of Strain Burst in Cyclic Creep of AI-Mg Alloy
    ZHU Shijie YANG Zhian WANG Zhongguang State Key Laboratory for Fatigue and Fracture of Materials,Institute of Metal Research,Shenyang,110015,ChinaTo whom correspondence should be addressed
    J. Mater. Sci. Technol., 1992, 8 (3): 177-180. 
    Abstract   HTML   PDF (653KB)
    Cyclic creep tests of Al-Mg alloy have been conducted at a wide range of stress and temperature.When Mg content is beyond 0.45%, the strain bursts can be observed in the cyclic creep curves.There exists a critical stress for the occur- rence of the strain burst,which increases with an in- crease of Mg content and is almost 60% of the ul- timate tensile stress.The occurrence of strain burst is proposed to be controlled by the easiness of the cross-slip of dislocations.For Al-Mg alloy,the dynamic strain aging plays an important role in the strain bursts.
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    Miscibility Gap in the Fe-Cu-Ni System at 1173 K
    GAN Weiping JIN Zhanpeng Central-South University of Technology,Changsha,410083,ChinaTo whom correspondence should be addressed
    J. Mater. Sci. Technol., 1992, 8 (3): 181-184. 
    Abstract   HTML   PDF (588KB)
    The isothermal section of the Fe-Cu-Ni ternary system at 1173 K was determined by microprobe analysis and diffusion triple technique. The experimental results show that this isothermal section only contains a miscibility gap region,and the maximal Ni content in the miscibility gap is 44.7 at.-%Ni.
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    Optimization and Calculation of the Al-Be-Si System
    DU Yong Q.S.Ran JIN Zhanpeng G.Effenberg DING Wei Dept.of Materials Science and Engineering,Central-South University of Technology,Changsha,410083,ChinaMax-Planck-Institut fur Metallforschung,Institut fur Werkstoffwissenschaften,Heisenbergstrasse 5,D-7000
    J. Mater. Sci. Technol., 1992, 8 (3): 185-191. 
    Abstract   HTML   PDF (605KB)
    Lattice stability of Be is estimated,and interaction parameters for the liquids in the Al-Be and Be-Si systems are obtained using phase dia- gram data from literatures.Using the obtained parameters and the lattice stabilities of Al and Si given in the literatures,the Al-Be and Be-Si phase diagrams are calculated.By means of Kohler's for- mula the Gibbs energy for the liquid phase in the Al-Be-Si ternary system is extrapolated.The calcu- lation shows that no excess ternary term is necessa- ry for the thermodynamic description of the system. The liquidus projection,isothermal section at 1273 K,as well as vertical sections at 94 and 88 wt-% Al and 2 wt-% Be are calculated.The calcu- lated results are in reasonable agreement with the experimental data available.
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    Protective Characteristics and Formation Mechanism of the Corrosion Product Films of B30 Tubes Exposed to Seawater
    ZHU Xiaolong LIN Leyun Surface Technology Center,General Research Institute for Nonferrous Metals,Beijing,110083,ChinaTo whom correspondence should be addressed
    J. Mater. Sci. Technol., 1992, 8 (3): 192-196. 
    Abstract   HTML   PDF (675KB)
    The corrosion product films of two kinds of B30 tubes(similar to CDA 715)exposed to seawat- er for various periods of time were investigated by SEM,AES and XPS.The results show that the pro- tective corrosion product film is thin,uniform and adherent.FeOOH is found to be present in the film surface,which confirms the hypothesis that iron hydroxide segregates at the surface of the film.The FeOOH promotes Ni enrichment in the corrosion layer by preventing Ni from running off.The corro- sion product film with no protectiveness is of lay- ered structure,loose and bad adherence.The for- mer film is formed through direct oxidation and the latter by precipitation and redeposition from dis- solved species.
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    Isothermal Crystallization Kinetics of an Amorphous CuTi Alloy
    MIAO Weifang LI Shuling WANG Jingtang State Key Laboratory for RSA,Institute of Metal Research,Academia Sinica,Shenyang 110015,ChinaTo whom correspondence should be addressed
    J. Mater. Sci. Technol., 1992, 8 (3): 197-203. 
    Abstract   HTML   PDF (904KB)
    Isothermal crystallization kinetics of Cu_(40)Ti_(60)amorphous alloy has been studied using differential scanning calorimetry(DSC).Both as-quenched and pre-annealed ribbons were inves- tigated.For crystallization of as-quenched amor- phous ribbon in Ar,it was found that the kinetics follows Johnson-Mehl-Avrami equation with mean Avrami exponent n=2.58,which indicates that crystallization of amorphous Cu_(40)Ti_(60)is a three-dimensional diffusion controlled growth pro- cess with constant nucleation rate,i.e.,primary crystallization process.The primary phase is the tetragonal CuTi_2.The as-quenched amorphous ribbons were also crystallized in air,the results re- veal that oxidation has no significant influence on crystallization kinetics of amorphous Cu_(40)Ti_(60). The results of crystallization of pre-annealed rib- bons show a decreasing tendency of Avrami expo- nent with increasing pre-anneal time.The local activation energy and local Avrami exponent dur- ing crystallization process of as-quenched amor- phous alloy were also examined.
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    Local Enrichment of Active Element Y in Y-modified PVD Films on Mild Steel Substrate
    LIU Changqing WU Weitao JIN Zhujing DAI Shaoxia WANG Wenhao Corrosion Science Laboratory,Institute of Corrosion and Protection of Metals,Academia Sinica,Shenyang,110015,ChinaInstitute of Metal Research,Academia Sinica,Shenyang,110015,ChinaTo whom correspo
    J. Mater. Sci. Technol., 1992, 8 (3): 204-208. 
    Abstract   HTML   PDF (576KB)
    By means of EPMA,SIMS and XTEM tech- niques,the element distribution at the transition zone of Y-modified ion plated titanium and titanium nitride film on A3 steel substrate and the variation of the element content on the surface of the evaporation source before and after service were studied in detail.A mode was proposed in terms of preferential evaporation and micro-tunnel trans- portation of Y at the interface of film/substrate.
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    Coarse WC Particles Ceramic-Metal Composite Coating by Laser Cladding
    ZENG Xiaoyan ZHU Beidi TAO Zengyi YANG Shuguo CUI Kun Dept.of Mechanical Engineering No.2,Huazhong University of Science and Technology,Wuhan,430074,ChinaTo whom correspondence should be addressed
    J. Mater. Sci. Technol., 1992, 8 (3): 209-213. 
    Abstract   HTML   PDF (1485KB)
    The coarse WC particles ceramic-metal com- posite coatings with WC density of 67 wt-% and thickness of 1.0-1.2 mm have been cladded on 20Ni4Mo steel surface by a 2 kW CO_2 laser.The sintered WC particles with the size of 600-1000 μm are chosen as the main strengthening phase, Ni-base self-flux alloy as the binder in the compo- site coatings.The microstructure and microhardness of both WC particles and binder are analysed.The rigid ball indention with acoustic emission technique is used to evaluate the brittleness of the coating.Finally,the abrasive wear resistance of the coating is tested.Besides,the coatings with the same ratio and size of WC parti- cles in low carbon steel tube rod were cladded on 20Ni4Mo steel by atomic hydrogen welding tech- nique and analysed by the same way,their results are compared.
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    Influence of Laser Coating on Microstructure and Properties of an Al-Si Alloy
    LI Yunlong HU Jiandong LIAN Jianshe LJian Dept.of Metal Materials Engineering,Jilin Univer sity of Technology,Changchun,130025,ChinaChangchun College of Optics and Fine Mechanics,Changchun,130021,ChinaTo whom correspondence should be addressed
    J. Mater. Sci. Technol., 1992, 8 (3): 214-218. 
    Abstract   HTML   PDF (1265KB)
    The microstructure and wear resistance of a cast Al-Si alloy coated with metal and rare earth elements and treated by the laser rapid melt-solidification(LRMS)are studied in the pres- ent work.Optical and SEM micrographic analyses showed that a superfine microstructure was ob- tained,and the hardness was remarkably enhanced by the LRMS treatment.Wear test showed that the rapid melt-solidified microstructure had higher wear resistance than that treated by ordinary solid solution treatment.
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    Mechanical Alloying of Co and Al Powders
    CHENG Lizhi ZHANG Yumei SUN Daozhi XIONG Xiangyuan HE Kaiyuan Dept.of Materials Science,Northeast University of Technology,Shenyang,110006,ChinaTo whom correspondence should be addressed
    J. Mater. Sci. Technol., 1992, 8 (3): 219-221. 
    Abstract   HTML   PDF (251KB)
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    Surface Infiltrating Composite of Fe-base Metal and Ceramics
    SHI Gongqi DING Peidao ZHOU Shouze PAN Fusheng
    J. Mater. Sci. Technol., 1992, 8 (3): 222-224. 
    Abstract   HTML   PDF (1045KB)
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    Rheological Behaviour of Steel ZG15CrMoV and Carbon Steel 35 at High Temperatures
    XU Dong AN Geying LI Qingchun Institute of Materials Science and Engineering,Shanghai Jiao Tong University,Shanghai,200030,ChinaDept.of Metallic Materials and Technology,Harbin Institute of Technology,Harbin,150006,ChinaTo whom correspondence should be ad
    J. Mater. Sci. Technol., 1992, 8 (3): 225-228. 
    Abstract   HTML   PDF (331KB)
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    Institute of Materials Science at Jilin University——A Brief Overview
    WANG Yuming Institute of Materials Science,Jilin University,Changchun,130023,China
    J. Mater. Sci. Technol., 1992, 8 (3): 229-230. 
    Abstract   HTML   PDF (239KB)
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