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ISSN 1005-0302
CN 21-1315/TG
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      28 January 1996, Volume 12 Issue 1 Previous Issue    Next Issue
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    Articles
    Preliminary Study on Aluminium-based Nanophase Composites Al_(88)Ni_(10)Y_2 and Al_(88)Ni_8Y_4
    Z. C.Zhong and A.L. Greer(Dept. of Materials Science & Metallurgy, University of Cambridge, Pembroke Street, Cambridge CB2 3QZ, UK)
    J. Mater. Sci. Technol., 1996, 12 (1): 1-6. 
    Abstract   HTML   PDF (1282KB)
    A new kind of aluminium-based alloy part amorphous/part crystalline, can be produced directlyby rapid quenching of the liquid. These materials have a novel structure of nanometer-sizedcrystals in an amorphous matrix and quite remarkable mechanical properties. The materialscan be considered to be nanophase composites. In this work Al88Ni10Y2 and Al88Ni8Y4 (atpct) nanophase composites consisting of a nanoscale dispersion of fcc-Al crystallites uniformlydispersed in an amorphous matrix, have been produced by melt-spinning. They have much highermicrohardness HV than fully amorphous alloys with the same composition. while retaining goodbending ductility The volume fraction, crystallite size and distribution of the fcc-Al phase havebeen estimated by DSC. X-ray diffraction and TEM. lt is found that the microstructure andproperties of the nanophase composites are very sensitive to the composition and the quenchingconditions. lncreasing the Y contedt and decreasing the Ni content at a given Al content givesmuch smaller dispersed nanophase aluminium crystallites. The volume fraction and crystallitesize of the fcc-Al phase increase with a decrease of wheel speed (quenching rate). The effectsof Y and Ni contents on the ease of formaticn of the nanophase composites are discussed. Theorigins of the novel mechanical properties are also considered.
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    Consolidation and Compression Property of Nanocrystalline NiAl Synthesized by Mechanical Alloying
    Zhiguang LIU; Jianting GUO; Nanlin SHI and Zhuangqi HU(State Key Lab. for RSA, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110015, China)
    J. Mater. Sci. Technol., 1996, 12 (1): 7-10. 
    Abstract   HTML   PDF (1322KB)
    The mixture of pure nickel and aluminum powders in the composition of Ni50AI50 was subjected to high energy ball milling. The high energy ball milling to 30 h resulted in the formation of a nanocrystalline NiAl with a grain size of about 10 nm. The as-milled NiAl powder was hot-pressed and the compact with a density of 90% was obtained. It was showed that heating to900℃ and holding for more than 2 h failed to induce the coarsening of the fine nanocrystalin the material, the tendency of grain growth was weak. Compression testing showed that thecompression ductility at room temperature reached about 7%. The ductility increased with theexperimental temperature while the strength decreased drastically at elevated temperature.
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    Glass Formation and Thermal Stability in Rapidly Solidified Al-Fe-V-Si Alloy with Misch Metal Additions
    Jianqiang WANG; Meiguang ZENG (M.K.Tseng) and Xiufang CHEN(Dept. of Material Science, College of Science, Northeastern University, Shenyang 110006, China)Lin DONG and Shixu GU(Liaoning Province Center of Analysis and Testing Research, Shenyang 110015, Chi
    J. Mater. Sci. Technol., 1996, 12 (1): 11-14. 
    Abstract   HTML   PDF (889KB)
    A new amorphous Al87.3Fe4.3V0.7Si1.7Mm6.0(Mm: misch metal) was prepared by using melt-spinning technique. Differential scanning calorimetry (DSC), X-ray diffraction (XRD). transmis-sion electron microscopy (TEM) and energy dispersive X-ray (EDX) have been used to investigatethe crystallization behaviour of thi5 amorphous alloy It is found that the crystallization processcan be concluded as follows: amorphous→ amorphous plus fcc-Al→ fcc-Al plus AI11(La,Ce)3plus i-phase (icosahedral)→ fcc-Al plus Al11(La,Ce)3 plus i-phase plus ic-phase (icosahedralcompounds). The results of microhardness measurement show that HV values are higher thanthose in Al-Fe-V-Si based alloy and the maximum HV value corresponds to the coexisting ofnanoscale Al particles and i-phase.
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    Diffusion of Hydrogen in Amorphous NiCrFeSiB Alloy
    Yu ZUO; Bo YANG and Rongsong XU(Dept. of Applied Chemistry, Beijing University of Chemical Technology, Beijing 100029, China)
    J. Mater. Sci. Technol., 1996, 12 (1): 15-18. 
    Abstract   HTML   PDF (363KB)
    The diffusion of hydrogen in amorphous NiCrFeSiB alloy has been studied by electrochemicalmethod. In the temperature range of 20~50℃, diffusion coefficient of hydrogen in the alloy fol-lows the equation' D(cm2/s)= 9.27x10-8exp(-53.4 kJ/RT). At room temperature the diffusion.coefficient D and the solubility Co are 6.125x 10-12 cm2/s and 0.007 mol/cm3, respectively.When As2O3 is added into the cathodic solution or the charging current density is increased, thediffusion coefficient and solubility increase, and the difFusion activation energy decreases. Theinfluence of amorphous structure on diffusion and solution of hydrogen is discussed.
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    Fluorescence Associated with Impurities in Nanostructured Al_2O_3
    Lide ZHANGt and GuoZhong WANG(Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China)Chimei MO(Dept. of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026, China)Tienan ZHAO(Institute
    J. Mater. Sci. Technol., 1996, 12 (1): 19-24. 
    Abstract   HTML   PDF (630KB)
    The fluorescent spectra of nanostructured Al2O3 after heat-treating at different temperatureshave been systematically investigated. The results show that for η-Al2O3 and γ-Al2O3, two broadfluorescent bands P1 and P2 appear in the wavenumber range of 20000 cm-1 to 11500 cm-1,and P1 and P2 bands are located in the wavenumber range of 20000 cm-1 to 14500 cm-1 and14500 cm-1 to 11500 cm-1, respectively The P1 band can be attributed to the impurity Cr3+luminescence. This is consistent with other author's result for the Cr doped Al2O3. The P2band is a new fluorescent phenomenon, which has not been reported previously. In this paper,the condition of the appearance of P2 and its mechanism is discussed in detail.
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    In Situ Al_2O_3-TiB_2/Al-Cu Composite Fabricated by Reaction Pressing of TiO_2-Al-B-CuO System
    Zongyi MA; Jihong LI Yuxiong LU; Xiaoguang NING and Jing BI(Lab. of Atomic Imaging of Solids, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110015, China)
    J. Mater. Sci. Technol., 1996, 12 (1): 25-28. 
    Abstract   HTML   PDF (2076KB)
    The in situ formed Al2O3 and TiB2 particulates reinforced Al-3.3 wt pct Cu alloy composite hasbeen successfully fabricated by reaction pressing of TiO2, Al, B and CuO powders. The in situformed Al2O3 and TiB2 particulates with a size from 10 nm to 2 μm are unifOrmly distributedin the matrix. The composite has a tensiIe Strength of 482 MPa and an elastic modulus of103.3 GPa.
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    Effect of Interfacial Bonding on the Toughening of Al_2O_3/Ni Ceramic Matrix Composites
    Xudong SUN(Dept. of Materials Science and Engineering, Northeastern University, Shenyang 110006, China)J.A. Yeomans(Dept. of Materials Science and Engineering, University of Surrey, Guildford, Surrey GU2 5XH, UK)
    J. Mater. Sci. Technol., 1996, 12 (1): 29-34. 
    Abstract   HTML   PDF (2865KB)
    The main Iimitation to the toughening of the α-Al2O3/Ni composite is the poor bonding atthe interface. which causes the nickel particles to be pulled-out during crack propagation with-out obvious plastic deformation. A proper control of oxygen content at the Al2O3-Ni interfacecan promote wetting at the intedece, and produce a mechanically interlocked and chemically strengthened intedece, causing most of the nickel particles to be stretched to failure and to expe-rience severe plastic deformation during crack propagation in the composite. Fracture toughnesstesting using a modified double cantilever beam method with in situ observation of crack prop-agation in a scanning electron microscope shows that the composite with the strengthenedinterface has a more desirable R-curve behaviour and a higher fracture toughness value than thenormal composite.
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    Characterization of Failure Mechanisms of Duplex and Graded Thermal Barrier Coatings Exposed to Thermal Shock Test
    A.F.Waheed and H.M.Soliman(Dept. of Metallurgy, Nuclear Research Center, Atomic Energy Authority, Cairo, Egypt)
    J. Mater. Sci. Technol., 1996, 12 (1): 35-40. 
    Abstract   HTML   PDF (2592KB)
    The beginning of failure of a (ZrO2-7%Y2O3)/(Ni-22%Co-17%Cr-12.5%Al-0.6%Y) duplex andgraded coating systems on lnconel 617 and IN738LC in burner rig tests has been characterized.The test conditions are 40 s heating up to 75O℃ substrate temperature followed by 80 s aircooling. Failure is considered at the appearance of the first bright spot during heating period.Stresses due to thermal expansion mismatch strains on cooling are the probable cause of life-limiting in this conditions of testing.
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    Kinetic Study of Cementation of Copper on Zinc Metal in Ethanol-Water Mixtures
    A.A.Zaghloul; G.M.EI-Subruiti and A.M.Ahmed(Chemistry Depatment, Faculty of Science, Alexandria University Alexandria, Egypt)
    J. Mater. Sci. Technol., 1996, 12 (1): 41-45. 
    Abstract   HTML   PDF (401KB)
    The cementation reaction of copper on zinc metal in solutions of different concentrations ofcopper sulphate, at 25℃, has been studied and it is found to be a first order reaction. Moreover,the rates of this reaction at 0.15 mol'L-1 copper sulphate solution have been measured in a varietyof ethanol-water media at temperatures from 20℃ to 40℃. The correlation between the masstransfer coefficient and the dielectric constant has been investigated. Also, the thermodynamicparameters of activation have been calculated. The isokinetic relationship reveals the existenceof compensation effect, where the solute-solvent interactions play an important role.
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    Toughening of Epoxy Resin with Microspheres
    Shijiu JIN; Xiaobing FENG; Jianquan PANG; Xiaoling HUA; Yiming LI and Yunzhao YU(Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China)
    J. Mater. Sci. Technol., 1996, 12 (1): 46-50. 
    Abstract   HTML   PDF (2108KB)
    Special microspheres dispersed in epoxy resin prior to curing can toughen brittle resin by formationof a second phase. In this work, rigid particles (HP), hollow particles (PO) and rubber powders(PR) are used to modify epoxy resins for the study on the toughening mechanism. The single-edge notched three-point bending test and T peel test have been used to measure the toughnessof epoxy resin. The morphology (particle/matrix interfacial shape) of epoxy resin modified withthese three kinds of microspheres has been investigated by transmission electron microscopy(TEM). The results show that these three kinds of modifiers are all effective, and the core-shellrubber particle (PR) is the best toughening modifier among them. It is also found that thetoughening effect is dependent on the morphology of the interface between the particles andmatrix and the different curing conditions really result in obviously different interface states.The excellent interfacial interaction plays a significant role in toughening epoxy resin.
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    Notch Severity Effect on Hydrogen Embrittlement of Type 4340 Steel
    Su'e LIU; Zhong ZHU and Wei KE(State Key Lab. of Corrosion and Protection, Institute of Corrosion and Protection of Metals,Chinese Academy of Sciences, Shenyang 110015, China) D.Hardie(Dept. of Mechanical, Materials and Manufacturing Engineering, Universi
    J. Mater. Sci. Technol., 1996, 12 (1): 51-56. 
    Abstract   HTML   PDF (2534KB)
    Hydrogen embrittlement of Type 4340 steel has been investigated by straining round-notchedspecimens in 105 Pa hydrogen atmosphere at a constent cross-head spead of 1.4x 10-4 mm/s.The circumferentially notched specimens exhibited a significant embrittlement when their me-chanical behaviour in hydrogen was compared with that in air. Although the effect of notch depthon fracture strength in air is negligible, an increase in the depth of notch increase susceptibility toembrittlement when testing in gaseous hydrogen. However, analysis of the effects is complicatedby the facts that (i) the specimens show some degree of notch severity even when strained inair and (ii) the behaviour is complicated by the localised plastic deformation that may occur forrelatively shatlow notches. Such effects are eliminated at high stress concentration factors, sothere is a systematic loss in fracture stress in hydrogen as the notch sensitivity increases fromK=2.6 to 5.7 (where a 87% reduction of fracture stress occurs) but a relatively stable value isthen reached even for very severe notching bj fatigue pre-cracking. Whether or not the effectis due to increasing concentration of hydrogen in the triaxial stress region ahead of the notch,there is no doubt that increasing the stress concentration makes hydrogen more effective as anembrittlement agent.
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    Elastic Energy and Elastic Interaction Ordering of Binary Solid Solutions
    Xiaobing REN and Xiaotian WANG(College 0f Materials Science and Engineering, Xi'an Jiaotong University, Xi'an 710049, China)K.Shimizu and T.Tadaki(Institute of Scientific and Industrial Research, Osaka University, 8-1, Mihoga-oka, Ibaraki, Osaka, 567, Jap
    J. Mater. Sci. Technol., 1996, 12 (1): 57-68. 
    Abstract   HTML   PDF (1061KB)
    A theory in the framework of continuum elasticity has been developed to calculate the totalcontribution of "atomic size effect" or "strain energy effect" to free energy of binary solidsolutions. It is found that elastic free energy consists of two parts f elastic self energy (ESE),and elastic interaction energy(EIE). The former is a function of composition alone, the latter isalso a function of atomic configuration. Minimization of total elastic free energy with respect toatomic arrangement resuIts in an ordered arrangement of atoms, which is caIIed elastic interactionordering (EIO), as it originates from elastic interaction among atoms. EIO is a kind of localordering within a "characteristic range", and it is found to be important in determining the Stateof solid solutions and structures of superlattices. The present theory also gives good explanationto the coexistence of ordering and decomposition which can not be understood in conventionaltheories.
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    Role of Edge and Screw Dislocations in Composite System on the Plastic Deformation of Metals
    Jian JIANG and Chiwei LUNG(International Centre for Materials Physics, Institute of Metal Research, Chinese Academy of Sciences,Shenyang 110015, China)
    J. Mater. Sci. Technol., 1996, 12 (1): 69-71. 
    Abstract   HTML   PDF (1806KB)
    The present paper has studied the effects of dislocation density on the role of edge and screwdislocations and described further the parallel feature of the edge and screw dislocations andtheir role on the plastic deformation of metals.
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    Alloy Model for the Stacking Fault Energy
    Xiliang NIE; Yumei ZHOU; Lieping ZHONG and Dingsheng WANG(Lab. for Surface Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China)Renhui WANG(Dept. of Physics, Wuhan University, Wuhan 430072, China)Yiying YE(Center of Instrument
    J. Mater. Sci. Technol., 1996, 12 (1): 72-74. 
    Abstract   HTML   PDF (280KB)
    An accurate and simple model of stacking fault energy for alloys (solid solutions) has beendeveloped based on the embedded-atom method. The calculated value of stacking fault energy35 mJ/m2 for 304 austenitic stainless steel, is in a good agreement with the experimental one,30 mJ/m2. In the present model we find that the Hirth's empirical relationship is also suitablefor alloy.
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    Behaviour of Hydrogen in Nano-transition Metals
    Zhikun ZHANG; Zuolin CUI; Kezeng CHEN Donghua ZUO and Lifeng DONG(Research Center of Nanocrystalline Materials, Qingdao Institute of Chemical Technology, Qingdao 266042, China)
    J. Mater. Sci. Technol., 1996, 12 (1): 75-77. 
    Abstract   HTML   PDF (1077KB)
    Nanocrystalline transition metals were prepared with Ar+H2 arc plasma method. The hydrogenmust be used during preparation to get a special nanrvparticles. The hydrogen plays an importantrole in the structure and state of nanocrystalline transition metals. The state of hydrogen andthe change of the nanocrystalline metal structure caused by hydrogen are called the behaviour ofhydrogen in nano-transition metals which includes the ability and function of storing hydrogenin the metals.
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    Sealing Interfaces of Pin in Colour Picture Tube
    Gangqiang WANG; Xiangyun TANG and Jusheng MA(Dept. of Materials Science and Engineering, Tsinghua University Beijing 100084, China)
    J. Mater. Sci. Technol., 1996, 12 (1): 78-80. 
    Abstract   HTML   PDF (2195KB)
    Interfacial geometric morphology, chemistry and microstructure have been studied by SEM,EDAX, HREM, and XPS. It is found that the oxide scale/metal interface consists of two layers.The first one is amorphous SiO2 growing inward metal matrix, and the second one under the firstlayer is TiO2 distributing in metal matrix. There is microstructural transition zone at Cr2O3/SiO2intedece, and an atomic mixed zone with 8 nm width at Si02/metal interface. The transitionzone which is saturated with Cr diffusing from oxide scale exists at the oxide scale/glass intedece.The reasons why sand-blasting process can improve bonding strength of the oxide scale and themetal are also discussed. The ideal interfaces are proposed finally.
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ISSN: 1005-0302
CN: 21-1315/TG
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