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CN 21-1315/TG
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      28 July 1993, Volume 9 Issue 4 Previous Issue    Next Issue
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    Low Temperature Environmental Embrittlement in Ordered Intermetallics
    N.S.Stoloff Department of Materials Engineering,Rensselaer Polytechnic Institute,Troy,New York,USAC.T.Liu Metals and Ceramics Division,Oak Ridge National Laboratory,Oak Ridge,Tennessee,USA
    J. Mater. Sci. Technol., 1993, 9 (4): 235-247. 
    Abstract   HTML   PDF (1467KB)
    A comprehensive review of low temperature environmental embrittlement in intermetallics is pres- ented. Moisture and hydrogen are shown to severely embrittle many intermetallics, including iron, nickel and titanium aluminides. The roles of composition, microstructure and external test variables are emphasized. Several methods to reduce or avoid embrittlement are described.
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    Novel Reduced-friction Materials by Laser Cladding of Copper Alloy on Cast Iron
    Xichen YANG Milin ZHONG Tianxi ZHENG Naikun ZHANG Laser Processing Lab.,Tianjin Institute of Textile Science and Technology,Tianjin,300160,China
    J. Mater. Sci. Technol., 1993, 9 (4): 248-252. 
    Abstract   HTML   PDF (970KB)
    Copper alloys suitable for laser cladding on cast iron are selected trom rune types of conventional powders. There are a poor spreading ability and porosity of copper alloy over the surface of castiron. Copper alloy surface is easily oxidized in atmosphere. These shortages have been overcome by ad- ding deoxidizers of Si and H_3BO_3. Laser parameters, stress and coefficient of friction have been ex- amined, and the larger smooth surface of Cu/cast iron for friction by laser cladding has been made for the application of the guide shoes of machine.
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    Transformations and Two Way Memory Effect Associated with Solution-treatment Temperature
    Chimei MO Zaitao LI Dept.of Materials Science and Engineering,University of Science and Technology of China,Hefei 230026,ChinaZhengang ZHU Institute of Solid State Physics,Academia Sinica,Hefei,230031,China
    J. Mater. Sci. Technol., 1993, 9 (4): 253-257. 
    Abstract   HTML   PDF (671KB)
    Effect of solution treatment temperature on transformations and two way memory, effect in a Ti- 55.2 wt-%Ni alloy was investigated. The results show that with increasing the solution treatment temperature (T_s), two way memory effect (TWME) decreases continuously and temperatures of martensite and reverse, martensite transformations (MR) rise, but the temperature of R start trans- formation (parent→R) does not change. The results of the internal friction measurements indicate that when T_s=1073 K, internal friction peaks of MR and P→R transformations are larger than those of the specimens after solution-treatments at 973 and 1173 K. With increasing T_s, the de- crease of TWME can be attributed to that the defect stress field caused by the rolling fades out grad- ually and preferential martensite variants, which fit into the defect stress field, decrease. The changes of transformation temperatures and internal friction peaks with T_s are closely related to the change of defect numbers.
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    Oxidation Behaviour of Laser Remelted Cr-containing Steels
    Guanyan FU Weitao WU Maocai WANG Shenglong ZHU Corrosion science Lab,Institute of Corrosion and Protection of Metals,Academia Sinica,Shenyang 110015,China
    J. Mater. Sci. Technol., 1993, 9 (4): 258-262. 
    Abstract   HTML   PDF (1867KB)
    Laser surface remelting of steels with different Cr contents has been performed by using a CO_2 laser. The results of oxidation tests showed that the effects of laser remelting on the oxidation resistance of Cr-containing steels have close relation to the Cr contents and microstructures of the steels. The re- sistance to high temperature oxidation of 18-8 and HK40 at 1273 K can be obviously improved by laser remelting, whereas laser remelting showed little effect on the oxidation resistance of Fe-6Cr and Cr30 at 1173-1273 K.
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    Cyclotron Resonance of Free Magnetopolaron in Quantum Well Wires
    Haiyang ZHOU Kadi ZHU Shiwei GU Dept.of Applied Physics,Jiaotong University,Shanghai,200030,China
    J. Mater. Sci. Technol., 1993, 9 (4): 263-267. 
    Abstract   HTML   PDF (455KB)
    The cyclotron resonance of magnetopolaron in quantum well wires (QWWs) have been studied with the use of variational solutions to the effective mass equation. The results show that both the abso- lute value of the electron-phonon interaction energy and the cyclotron resonance frequency de- crease with the increase of the sizes of QWWs, and also that the cyclotron resonance frequency in- creases with the external magnetic field.
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    Interfacial Characteristics of Nanocrystalline FeMoSiB Alloys
    Xuedong LIU Jingtang WANG State Key Lab.of RSA,Institute of Metal Research,Academia Sinica,Shenyang,110015,ChinaJie ZHU Jian JIANG International Centre for Materials Physics,Institute of Metal Research,Academia Sinica,Shenyang,110015,China
    J. Mater. Sci. Technol., 1993, 9 (4): 268-272. 
    Abstract   HTML   PDF (842KB)
    By using X-ray diffraction (XRD), transmission electronic microscopy (TEM) and transmission Mssbauer spectroseopy (TMES), the formation, structure and properties including microhardness and electrical resistivity of nanocrystalline FeMoSiB alloys have been investigated. By annealing the as-quenched FeMoSiB sample at 833-1023K for 1 h, nanocrystalline materials with grain sizes of 15 to 200 nm were obtained. Mssbauer spectroscopy results reveal a quasi-continuous distribution feature of P(H)-H curves for 15 nm-and 20 nm-grained samples. Also, it was found that resistivity and microhardness of nanocrystalline Fe-Mo-Si-B alloys exhibit strong grain size effect.
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    Asymmetry Behaviour between Tension and Compression for Prestrained Materials under Cyclic Loading
    Huifen CHAI Zheng RUAN Quncheng FAN Dept.of Materials Science and Engineering,Xi'an Jiaotong University,Xi'an,710049,China
    J. Mater. Sci. Technol., 1993, 9 (4): 273-278. 
    Abstract   HTML   PDF (1553KB)
    The prestrained metals show substantial asymmetry between tension and compression in addition to the softening under cyclic loading, thus the cyclic creep takes place at a load-control test. The soft- ening reflects the decrease in density of dislocation and total internal stress, and the creep implies the asymmetry in back stress between tension and compression, The mechanical behaviour of the soft- ening is similar for materials with different slip modes, but their features of creep differ significantly. The creep of planar slip Cu-Zn alloy exhibits“explosively”, while that of wavy slip Cu and low car- bon steel occurs continuously and slowly. The explanation of creep behaviour via the internal dislo- cation structure was presented in this paper. According to asymmetw behaviour, it can be concluded that the internal processes of softehing also strongly depend on the slip mode. In addition, under high stress amplitude the opposite asymmetries take place for Cu and Cu-Zn alloy, it indicates that asymmetric back stresses developed in pretension have been eliminated even though the density and the configuration of dislocations have not reached equilibrium.
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    Diffusion Behaviour of Fe-Cu Interface of Copper Brazed Double-wall Steel Tubes
    Yourong XU Deying WANG Qi JIN Yijian ZHOU Shanghai University of Science and Technology,Shanghai,201800,ChinaFan HU Chao LIU Iron and Steel Research Institute of Baoshan Iron and Steel Complex,Shanghai,201900,China
    J. Mater. Sci. Technol., 1993, 9 (4): 279-282. 
    Abstract   HTML   PDF (887KB)
    By means of electron probe(EPMA),scanning electron microscope(SEM),and optical microscope (QM),the diffusion behaviour on the Fe-Cu interface of copper brazed double-wall steel tubes and the microstructure of the diffusion layer have been investigated.There are three kinds of metallurgical bonds between copper plating layer and steel substrate: (1)the Cu diffusing into steel substrate along grain boundary of ferrite;(2)the Cu diffusion into grain bulk of ferrite: (3)the Fe diffusing into Cu layer.The copper brazed double-wall steel tubes are formed by the combination of the diffusions mentioned above and this is the reason for excellent mechanical and technological properties of the copper brazed double-wall steel tubes.
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    Dendritic Deposition of NH_4CI Crystals with Free Surface as Simulations of Surface Solidification of Materials
    Junming LIU Zhiguo LIU Zhuangchun WU National Lab.of Solid State Microstructures,Nanjing University,Nanjing 210008,China
    J. Mater. Sci. Technol., 1993, 9 (4): 283-288. 
    Abstract   HTML   PDF (1859KB)
    As a simulation of surface solidification of materials,quasi-two dimensional dendritic deposition of ammonium chloride(NH_4Cl)crystals from an aqueous solution film with free surface by vapourization was investigated by the in- situ observation technique.The depositing morphologies of NH_4Cl crystals are faceted and of growth laws differing from the three-dimensional case.Under low supersaturation,faceted dendrites formed,whereas the anisotropy in growth kinetics decreases with the increase of supersaturation.When vapourizing rate(supersaturation)is not very low, oscillations of growth rate.tip-radius and second arm spacing of the dendrites were observed.It is suggested that this dynamic phenomenon is attributed to the correlation between the convection-transfer effect induced by the surface tension gradient of solution film.and the driving force for deposition.
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    Microstructure of Laser Processed T10 Carbon Tool Steel
    Xianzhang BU Fine Mech.Mater.and Technol.Dept.,Changchun Institute of Optics and Fine Mechanics,Changchun,130022,ChinaHongying WANG Zhang LI Jiandong HU Microanalysis Center,Jilin University of Technology,Changchun,130025,China
    J. Mater. Sci. Technol., 1993, 9 (4): 289-292. 
    Abstract   HTML   PDF (907KB)
    The microstructure of the laser melted 1.0%C tool steel have been investigated.The region affected by the laser can be subdivided into 3 zones,which consist of a melted region at the surface,a zone with solid state transformation and the area adjacent to the unaffected substrate where cementite is slightly dissolved.The melted zone possessed a cellular growth morphology consisting of austenite and martensite.The carbon content of the austenite was measured to be over 1 wt-%.A great deal of retained austenite and twinned martensite were found in the first two zones(the melted and solid transformed).
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    Effect of Tempered Martensite on Magnetomechanical Damping of Ferritic Matrix Dual Phase Alloys
    Junsheng LU Xiaodong LIU Wenjie ZHENG Baorong WU Hui BI Central Iron and Steel Research Institute,Beijing,100081,ChinaGuijin WANG Dept.of Materials Science and Engineering,University of Pennsylvania,Philadelphia,PA 19104,USA
    J. Mater. Sci. Technol., 1993, 9 (4): 293-296. 
    Abstract   HTML   PDF (389KB)
    The influence of the volume fraction of tempered martensite on magnetomechanical damping of the ferritic matrix in dual-phase alloys was studied.The experimental results showed that(1) dual-phase damping alloy is of good combination of strength and toughness: (2)good damping ca- pacity(Q~(-1)≥5.0×10~(-3))can be obtained in dual-phase alloys only when the volume fraction of tempered martensite was controlled properly.The effect of martensite on magnetomechanical damp- ing of the ferritic matrix was analysed.The damping capacity of dual-phase alloys was related to the volume fraction V_m of tempered martensite by Q_~(-1)=Q_~(-1) (1-V_m/1+BV_m)at small vibration strain amplitudes ε_A≤5.0×10~(-6).
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    SIMS Studies of Tracer Diffusion of Al in Thin Film Nanocrystalline Cu
    Honggang JIANG Jingtang WANG Bingzhe DING Qihong SONG State Key Lab.of RSA,Institute of Metal Research,Academia Sinica,Shenyang,110015,China
    J. Mater. Sci. Technol., 1993, 9 (4): 297-300. 
    Abstract   HTML   PDF (432KB)
    Diffusion of Al in thin film nanocrystalline Cu(18 nm)has been investigated by means of second ion mass spectroscopy(SIMS).In the experimental temperature ranges from 421 to 773 K,there seem- ingly exists two diffusion mechanisms.The impurity elements O and C are supposed to accumulate to the grain boundaries and inhibit the fast grain boundary diffusion.
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    Effect of Concurrent Pulse in Holding Duration on Superplasticity of 2091Al-Li Alloy
    Zhiyi LIU Jianzhong CUI Guangrun BAI Metal Forming Department,Northeastern University,Shenyang,110006,China
    J. Mater. Sci. Technol., 1993, 9 (4): 301-303. 
    Abstract   HTML   PDF (1307KB)
    The effects of concurrent pulses in holding duration on superplasticity of 2091 Al-Li alloy have been investigated in this paper.The results of superplastic deformation showed that concurrent pulses in holding duration decreased the optimum holding time for superplastic deformation(ε=3.33× 10~(-2) s~,T=500℃)from 15 to 5 min and increased elongation(δ)from 530 to 550%.The metallographic observations showed that the specimens appliedly by concurrent pulse were com- pletely recrystallized after holding 5 min at 500℃,and grains refined to about 2μm,and those spec- imens unapplied current pulses were partly recrystallized even after holding 15 min at 500℃.the electron probe analyses indicated that concurrent pulses promoted atomic diffusion.It is pointed out that concurrent pulses accelerate atom diffusion and dislocation motion.increase nucleation rate of recrystallization and decrease the optimum holding time for superplastic deformation and increase superplastic properties.
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    Mechanism of the Interfacial Reaction of AI_2O_3/Medium Mn Steel Containing Nb
    Sirong YU Yaohui LIU Zhenming HE Dept.of Metallic Materials Engineering,Jilin University of Technology,Changchun,130022,China
    J. Mater. Sci. Technol., 1993, 9 (4): 304-306. 
    Abstract   HTML   PDF (405KB)
    The mechanism of the interfacial reaction of Al_2O_3/medium Mn steel containing Nb was studied by means of the observation on the interfacial reaction phenomenon of Al_2O_3/medium Mn steel,and the analyses on the interracial phases.The results show that when T≥1550℃,the interfacial reac- tion of Al_2O_3/medium Mn steel containing Nb happened.In the medium Mn steel matrix,Nb exists in the form of NbC.NbC are the nucleating base of CO gas bubbles.
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    A New Dispersion-strengthening Phase in an Aged RST Al-8Fe-2Mo-2Zr-2Nd-0.7Ti-1.6Si Alloy
    Shenglong DAI Guifu YU Minggao YAN Institute of Aeronautical Materials,Beijing,100095,China
    J. Mater. Sci. Technol., 1993, 9 (4): 307-309. 
    Abstract   HTML   PDF (894KB)
    An effective dispersion-strengthening phase in Al-8Fe-2Mo-2Zr-2Nd-0.7Ti-1.6Si alloy was identified to be an aged precipitate phase with possible chemical stoichiometry of Al_(20)(Ti,Mo)_2 Nd and fcc crystal structure with a_o=1.455 nm.The structure was determined to be Fm3m space group.
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    Deformation-induced Microstructures of High-Mn Austenite Steel
    Qixun DAI Shupeng HUO Jiangsu Institute of Technology,Zhenjiang,212013,China
    J. Mater. Sci. Technol., 1993, 9 (4): 310-311. 
    Abstract   HTML   PDF (616KB)
    Deformation-induced microstructures of high-Mn austenite steel was investigated by metallography,X-ray diffraction and SEM.The ε-martensite and slip-bands are deformation-in- duced on the{111} planes,and appear as thin straight laths with 60~80° alignment difference be- tween them.It was found that ε-martensite and slip bands are kinked at fcc twin boundaries with the kinked angle 35~40°.The bands of equilateral triangle in the microstructure of tensile deformation are presented.
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CN: 21-1315/TG
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