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ISSN 1005-0302
CN 21-1315/TG
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      28 March 1994, Volume 10 Issue 2 Previous Issue    Next Issue
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    Effects of Microstructure on the Tensile, Fracture Toughness and Fatigue Behaviour of Gamma Titanium Aluminides
    Young- Won (Y-W.) Kim(UES, Inc., Materials Research Division, 4401 Dayton-Xenia Rd., Dayton, OH 45432, USA)(Paper presented at the International Workshop on OrderedIntermetallics 1992, Hangzhou, China)
    J. Mater. Sci. Technol., 1994, 10 (2): 79-91. 
    Abstract   HTML   PDF (8539KB)
    The effects of microstructure on the deformation and fracture behaviour of two-phase TiAl alloys were investjgated under monotonic and cyclical loading conditions, over a range of temperatu res.The tensile behaviour is analyzed for deformation temperatures between RT and 950℃, Fracture resistance behaviour and toughening mechanisms at RT and 800℃ are analyzed. and the inverse relationship botween ductility and toughness is explained using the crack initiation toughness. The preliminary results of load-controlled fatigue behaviour at 800℃ are interpreted using the tensile behaviour because deformation structure and fracture modes are similar under these two loading conditions
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    Hydrogen Permeation and Diffusion in Low-carbon Steels and 16Mn Steel
    Jian XU and Xiukui SUN(State Key Lab. of RSA, Institute of Metal Research, Academia Sinica, Shenyang, 110015, China)Xiaozi YUAN and Baoming WEI (To whom correspondence should be addressed)(Dept. of Applied Chemistry, Nanjing Institute of Chemical Technol
    J. Mater. Sci. Technol., 1994, 10 (2): 92-96. 
    Abstract   HTML   PDF (474KB)
    In the present work. the hydrogen permeation and diffusion in two low-carbon steels. # 10 and #20. and 16Mn stee1 over the temperature range of 80 to 330℃ were investigated using gaseous permeation technique. The temperature dependence of hydrogen permeability. diffusivity and solubility for the three steels was obtained in the form of the Arrhenius equations. It was shown that the hydrogen permeability of the 16Mn steel is somewhat lower than that of the two low-carbon steels.whereas the hydrogen diffusivity is lowered in the order of #10, #20 and 16Mn but the activation energy of diffusion is much the same for the three steels. The difference in the diffusivity was attributed to the increase of ferrite-cementite interface areas with the refinement of pearlitic structure in the steels
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    EPR Study of Borax-glasses with Addition of Fe~(3+) Ions
    M.Peteanu; L. Cociu and I. Ardelean (Dept. of Physics, University of Cluj-Napoca, Str. M.Kogalniceanu No. 1, 3400 Cluj-Napoca, Romania)(To whom correspondence should be addressed)
    J. Mater. Sci. Technol., 1994, 10 (2): 97-106. 
    Abstract   HTML   PDF (990KB)
    Glasses of xFe2O3 (l-x) Na2B4O7 for 0.3≤x≤5 mol% have been studied by means of EPR. The distribution of Fe3+ ions in the vitreous network. as isolated and connected in clusters. depends on the impurity contents in the glass. A thermal treatment inducing the Fe3+ -rich phase separation ends at the sample crystallization, when performed at about 550℃, Weathering of glasses causes a Superficial alteration of their optical properties. It enters the bulk of the glass for powdered samples. As a result of gamma irradiation pararnagnetic hole centers were detected:the BOHC. the peroxy radical and the iron hole centers
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    Perspective in Development of Shape Memory Materials Associated with Martensitic Transformation
    Zuyao XU (T. Y.Hsu) (Shanghai Jiaotong University, Shanghai, 200030, China)
    J. Mater. Sci. Technol., 1994, 10 (2): 107-110. 
    Abstract   HTML   PDF (459KB)
    By consideration of the characteristics of martensitic transformation and the derivation from the application of the group theory to martensitic transformation, it may be concluded that the shape memory effect (SME) can be attained in materials through a martensitic transformation and its reverse transformation. only when there forms single or nearly single variant of martensite, with an absence of the factors causing the generation of the resistance against SME. on this principle, various shape memory materials including nonferrous alloys. iron-based alloys and ceramics containjng zirconia are expected to be further developed. A criterion for thermoelastic martensitic transformation is presented, Factors which may act as the resistance against SME in various materials are briefly described
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    Study of Polymer Blends with Sub-cluster Theory Part I Essential Concepts and Equations of Sub-cluster Theory
    Riguang JIN and Hangquan LI (Beijing Institute of Chemical Technology, Beijing, 100029, China)(To whom correspondence should be addressed)
    J. Mater. Sci. Technol., 1994, 10 (2): 111-116. 
    Abstract   HTML   PDF (528KB)
    Various viscosity-composition curves of polymer blends are summarized in eight groups. To represent these curves. "sub-cluster equations" are derived on the basis of so called "sub-cluster theoryThe essential concepts of sub-cluster theory and the derivation of those "Sub-cluster equations" are briefly introduced.
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    Crystal Structure during Film Formation
    Guoping DU; Hui SHEN; Lanping YUE; Weiguo YAO; Zongquan LI and Zhenzhong QI (Institute of Solid State Physics, Academia Sinica, Hefei, 230031, China)(To whom correspondence should be addressed)
    J. Mater. Sci. Technol., 1994, 10 (2): 117-120. 
    Abstract   HTML   PDF (1799KB)
    For evaporation-deposited Ti films, face-centred cubic structure was observed at the initial stage of film growth, then transited to the hexagonal close-packed structure during film growing (less than 50 nm thick). While. for ion-beam sputter-deposited films. the structure of films always kept the fcc structure during all stages of film formation. The structure of film at initial growth stages relates with the substrate. It is discussed that different film processes and different growth stages provide different thermodynamic condition of film formation and result in the different crystal structures of films during the film formation
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    Microstructures of Thermomechanically Treated Eutectoid Zn-Al Alloy
    Y. H.Zhu(Instituto de Investigaciones en Materiales, Universidad Nacional Autonoma de Mexico, Mexico City, Mexico) F.E.Goodwin (Addressed: Instituto de Investigaciones en Materiales, UNAM, Apdo. P70-360, Mexico D.F.04510, Mexico) (International Lead and Z
    J. Mater. Sci. Technol., 1994, 10 (2): 121-126. 
    Abstract   HTML   PDF (2969KB)
    A continuously cast eutectoid Zn-Al alloy was extruded at about 250℃ and the complex microstructures of three phases (α. ε and η'E) were observed in the extruded eutectoid Zn-Al alloy.The fcc Al-rich α phase appeared as isolated particles with clear boundaries instead of the α phase occurring with diffuse boundary within the dendrites of the as-cast structure. A new unstable phase η'E was determined to have hexagonal close packed crystal structure. The decomposed β's, phase comprised the matrix. The new phase η'E decompoeed and a four phase transformation α+ε T'+η occurred afterwards during the isothermal holding. The extruded alloy tended to be stable after these two phase transformations. The early shrinkage and the following increase in dimension were related to the decomposition of the new phase η'E and the four phase transformation.
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    Growth Kinetics of γ′ Particles in Incoloy 907
    Xu ZHAO; Dongfa LI; Ke YANG; Cungan FAN and Yiyi LI (Institute of Metal Research, Academia Sinica, Shenyang, 110015, China)(To whom correspondence should be addressed)
    J. Mater. Sci. Technol., 1994, 10 (2): 127-130. 
    Abstract   HTML   PDF (834KB)
    The kinetics of growth of the γ' precipitate in an lncoloy 907 alloy have been studied. The kinetics of particle growth obeyed the tirne law predicted by the Lifshitz-Wagner theory. The distribution of γ'particle sizes was found to be significantly broader than the theoretical distribution of LifshitZ-Wagner theory. It is suggested that this is due to the relatively large lattice parameter mismatch between γ' and the Fe-Ni-Co matrix
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    Temperature Effects on the Self-trapping Energy of a Polaron in a GaAs Parabolic Quantum Dot
    Kadi ZHU and Shiwei GU (Institute of Condensed Matter Physics, Shanghai Jiaotong University, Shanghai, 200030, China)(To whom correspondence should be addressed)
    J. Mater. Sci. Technol., 1994, 10 (2): 131-134. 
    Abstract   HTML   PDF (374KB)
    The temperature and the size dependences of the self-trapping energy of a polaron in a GaAs parabolic quantum dot are investigated by the second order Rayleigh-Schrodinger perturbation method using the framework of the effective mass approximation. The numerical results show that the self-trapping energies of polaron in GaAs parabolic quantum dots shrink with the enhancement of temperature and the size of the quantum dot. The results also indicate that the temperature effect becomes obvious in small quantum dots
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    Mossbauer Spectroscopic Studies on a Supersaturated Solid Solution of Fe-Cu Formed by Mechanical Alloying
    Yuanzheng YANG and Xueming MA (Institute of Solid State Physics, Academia Sinica, Hefei, 230031, China)(To whom correspondence should be addressed)Yuanda DONG(Dept. of Metallurgy arid Materials, Shanghai University of Technology, Shanghai, 200072, China)
    J. Mater. Sci. Technol., 1994, 10 (2): 135-138. 
    Abstract   HTML   PDF (366KB)
    Mechanical alloying (MA) was employed to produce supersaturated solid solutions of Fe1-xCux,which is virtually immiscible under an equilibrium condition at ambjent temperature. The X-ray diffraction results show that the solutions formed in the concentration ranges of x≤0.1 5 and x≥0.40 are of bcc structure of iron and fcc structure of copper. respectively. For the region in between.however, the alloy obtained is a mixture of bcc plus fcc phases. The Mossbauer spectrum of the solid solution of a single phase could be fitted by two sub-spectra with hyperfine magnetic fields of 200 and 250 kOe. respectively. suggesting that there must exist two forms of coordination in the solution. While to fit the spectrum for the solution with mixed structu re. three Sub-spectra. including a spectrum of α-Fe, should be used. The variation of the Mossbauer spectra of Fe60Cu40 with milling time as well as annealing temperature was systematically studied. This may be ascribed to the changes of the number of nearest neighboring atoms of iron in the processes of formation and decomposition of the solid solution during milling and annealing
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    TEM Investigations of Thermal Stability of Nanocrystamne Co_(81)Cr_(19)
    Jingtang WANG; Bingzhe DING; Huayu TONG and Qihong SONG (State Key Lab of RSA, Institute of Metal Research, Academia Sinica, Shenyang, 110015, China)(To whom correspondence should be addressed)
    J. Mater. Sci. Technol., 1994, 10 (2): 139-142. 
    Abstract   HTML   PDF (2161KB)
    In situ transrnission electron microscopic observations were carried out to study the thermal stability of nanocrystalline Co81 Cr19 (n-Co81 Cr19) alloy prepared by d.c. sputtering, The TEM results show that the originally existed nanocrystalline phase hcp-CoCr is thermally stable, no apparent grain growth was observed until annealing to the final stage at.800℃. But the evolution of .microstructure of amorphous oxide Co2Cro4. which is formed duting in situ annealing. is drastically affected by the electron irradiation. In the electron irradiated area. the newly formed amorphous oxide Co2CrO4crystallizes at about 550℃. and grows into fine crystals finally. However, in the electron nonirradiated area, the amorphous oxide Co2CrO4 crystallizes at about 630℃. and grows into large strip shaped crystals during afterward annealing. the space between strip shaped crystals are also fine grained hcp-CoCr alloy. XRD analysis result of the thick film Co81 Cr19 is in good agreement with that of in situ TEM for the excellent stability of hcp-CoCr
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    Mechanically Driving Solid Solution in an Immiscible W-Cu System
    E DONG and Guoxing LIU (Department of Material Science and Engineering, Nanjing University of Science and Technology, Nanjing, 210014, China)(To whom correspondence should be addressed)
    J. Mater. Sci. Technol., 1994, 10 (2): 143-147. 
    Abstract   HTML   PDF (1881KB)
    In order to improve the homogeneity of the pseudo-alloy W-Cu used in a certain ordnance component. the formation of solid solution of W-Cu system with a positive heat of mixing by mechanical alloying (MA) has been studied by X-ray diffraction (XRD), scanning electron microscopy (SEM).transmission electron microscopy (TEM ) and differential thermal analysis (DTA). It was found that the supersaturated solid solution phase formed in the whole investigated composition range from W90Cu10 to W60Cu40 (at.-%). although the systern W-Cu exhibits a total immiscibility in both solid and liquid states, A systematic investigation on W70Cu30 showed that a solid solubility of Cu in W increased with the milling time. The Iattice parameters of phase W decreased with the increasing of the milling time and solute content of Cu. The thermal stability of the solid solution was studied by DTA. It was found that the decomposition of solid solution. the recovery and the growth of the grain occurred over 2 50℃. The driving force of the solid solution W-Cu system by MA mainly comes from high density of defects bV ball milling, which would enhance the free energy of the system. The solution process is diffusion-controlled
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    γ-Fe Nano-particles from Fe(CO)_5 by CW CO_2 Laser-driven
    Xinqing ZHAO; Yong LIANG; Keshen XIAO; Feng ZHENG and Zhuangqi HU (State Key Lab. of RSA, Institute of Metal Research, Academia Sinica, Shenyang, 110015, China)(To whom correspondence should be addressed)
    J. Mater. Sci. Technol., 1994, 10 (2): 148-150. 
    Abstract   HTML   PDF (721KB)
    γ-Fe nano-particles with size of 20-40 nm were produced by SF6-sensitized CW CO2 laser-induced gaseous pyrolysis of Fe(Co) 5, The γ-Fe stabte in reaction zone at above 910℃ was formed.The rapid quenching prevents from the γ-Fe transforming to α-Fe as rapidly cooling from high temperature to room temperature, The characteristics of the particles were examined at room temperature by TEM. electron diffraction and XRD. It was proved that about 70% of γ-Fe phase in the particles was present. In addition. the lattice constant of the γ-Fe was 0.364 nm in place of 0.360 nm
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    Adsorption and Desorption of Gold on the Magnetic Activated Carbon
    Chonglin WANG; Qingcai LIU; Xiaozhen CHENG and Zuhong SHEN (Institute of Metal Research, Academia Sinica, Shenyang, 110015, China)(To whom correspondence should be addressed)
    J. Mater. Sci. Technol., 1994, 10 (2): 151-153. 
    Abstract   HTML   PDF (279KB)
    Adsorption and desorption of gold on the magnetic activated carbon (MAC) were investigated The adsorption rate of gold is higher than that of conventional coconut carbon in cyanide leach solution The loading gold can be easily desorbed as coconut carbon. Crushed fine magnetic carbon can be selected by a magnetic separator, It is suggested that the MAC can be used in carbon-in-pulp (CIP)process for increasing the recovery rate of gold
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    Investigation of Truc Ni~(2+)-Halide Distances in Alkali Halide Lattices
    Xuanrong MA(Department of Physics, Ningxia University, Yinchuan, 750021, China)Maolu DU(Institute of Solid State Physics, Sichuan Normal University, Chengdu, 610066, China)(To whom correspondence should be addressed)
    J. Mater. Sci. Technol., 1994, 10 (2): 154-156. 
    Abstract   HTML   PDF (304KB)
    Using the μKα model of Ni2+-6X- cluster, the true distances between impurity Ni2+ cation and halide anion in alkali halide lattices are estimated from the optical spectra data. The results suggest that the true impurity cation- ligand anion distances are close to the sum of ionic radii of the impurity cation and ligand anion but not the cation - anion distance of the perfect lattices in the case of that the ionic radius of host cation is more larger than that of impurity cation
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ISSN: 1005-0302
CN: 21-1315/TG
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