Advanced Engineering Materials

Cover image for Vol. 10 Issue 10

October, 2008

Volume 10, Issue 10

Pages 899–989, B33–B59

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Contents
    4. Review
    5. Research News
    6. Communications
    7. Inside Front Cover
    8. Review
    9. Communications
    1. Cover Picture: Mechanical Properties of Cast Ti-6Al-2Sn-4Zr-2Mo Lattice Block Structures (Adv. Eng. Mater. 10/2008)

      Q. Li, E. Y. Chen, D. R. Bice and D. C. Dunand

      Version of Record online: 27 OCT 2008 | DOI: 10.1002/adem.200890026

      Lattice block structure panels, consisting of two truss plates and a truss core, produced by investment casting of the high-temperature titanium alloy Ti-64 (Ti-6Al-4V) and Ti-6242 (Ti-6Al-2Sn-4Zr-2Mo). These low-density panels exhibit excellent compressive stiffness, strength, ductility and energy absorption at both ambient and elevated temperature and can be used for energy-efficient aerospace transportation systems. More details can be found in the article by Qizhen Li, Edward, Y. Chen, Douglas, R. Bice, and David C. Dunand on page 939.

  2. Contents

    1. Top of page
    2. Cover Picture
    3. Contents
    4. Review
    5. Research News
    6. Communications
    7. Inside Front Cover
    8. Review
    9. Communications
  3. Review

    1. Top of page
    2. Cover Picture
    3. Contents
    4. Review
    5. Research News
    6. Communications
    7. Inside Front Cover
    8. Review
    9. Communications
    1. Recent Activities in the Field of Thermal Barrier Coatings Including Burner Rig Testing in the European Union (pages 907–921)

      R. Vaßen, F. Cernuschi, G. Rizzi, A. Scrivani, N. Markocsan, L. Östergren, A. Kloosterman, R. Mevrel, J. Feist and J. Nicholls

      Version of Record online: 27 OCT 2008 | DOI: 10.1002/adem.200800015

      Thumbnail image of graphical abstract

      Although thermal barrier coatings are used in industry for several decades there is still considerable demand for a further improvement of this coating system. Present research projects are for example dealing with the improvement of temperature capability and lifetime, developing of lifetime models, new processing technologies, or incorporating of additional functional properties in the coating. The present paper tries to give an overview on these recent research activities. In addition, it will also try to describe the different burner rig test facilities in Europe, which serve as an important test bed of thermal barrier coating systems.

  4. Research News

    1. Top of page
    2. Cover Picture
    3. Contents
    4. Review
    5. Research News
    6. Communications
    7. Inside Front Cover
    8. Review
    9. Communications
    1. Functional Fatigue of Shape Memory Polymers (pages 922–927)

      C. Schmidt, K. Neuking and G. Eggeler

      Version of Record online: 27 OCT 2008 | DOI: 10.1002/adem.200800213

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      In the present study the functional fatigue in the commercial SMP Veriflex® which is associated with repeating up to 20 programming/1-WE cycles has been examined. The material is characterized by a glass temperature Tg of 67 °C, above which it looses all its strength. Thermomechanical cycles including programming, cooling and unloading and heating to trigger the one way effect result in an increase of irreversible strain associated with a corresponding decrease of recovery ratio at the beginning of thermomechanical cycling. In parallel a wavy surface structure evolves during cycling.

  5. Communications

    1. Top of page
    2. Cover Picture
    3. Contents
    4. Review
    5. Research News
    6. Communications
    7. Inside Front Cover
    8. Review
    9. Communications
    1. On the Formation of Ordered ω-phase in High Nb Containing γ-TiAl Based Alloys (pages 929–934)

      A. Stark, A. Bartels, H. Clemens and F.-P. Schimansky

      Version of Record online: 27 OCT 2008 | DOI: 10.1002/adem.200800188

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      In Ti-45Al-10Nb the β/B2-phase transforms below 913 °C into B82 ordered ω-phase. During deformation of Ti-45Al-(5-7.5)Nb at 800 °C the ω/B82-phase occurs in absence of β/B2-phase on the expenses of α2-Ti3Al phase. During long term exposure to 800 °C a very slow transformation α2 into ω/B82- and γ-phase is observed. Small carbon additions hamper the formation of ω/B82-phase.

    2. Elastic properties of Tin+1AlCn and Tin+1AlNn MAX phases (pages 935–938)

      M. F. Cover, O. Warschkow, M. M. M. Bilek and D. R. McKenzie

      Version of Record online: 27 OCT 2008 | DOI: 10.1002/adem.200800109

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      The MAX phases are a class of nano-laminate materials with a unique combination of ceramic and metallic properties. Experimental investigation of the properties of the MAX phases is limited by diculties associated with producing phase pure samples. In this work the authors use first principles density functional theory calculations to examine the elastic properties of the Tin+1AlXn (X=N,C) series as a function of n with the aim of identifying optimum compositions that combine good machinability with high stiffness.

    3. Mechanical Properties of Cast Ti-6Al-2Sn-4Zr-2Mo Lattice Block Structures (pages 939–942)

      Q. Li, E. Y. Chen, D. R. Bice and D. C. Dunand

      Version of Record online: 27 OCT 2008 | DOI: 10.1002/adem.200800114

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      Lattice block structure panels with of a core separating two plates, both consisting of 3.2 mm diameter struts, were produced by investment casting of Ti-6Al-2Sn-4Zr-2Mo. Individual struts exhibit a microstructure and mechanical properties in compression and bending comparable to the bulk cast alloy. The panels show a decrease in compressive strength (from 35 to 17 MPa) and an increase in compressive ductility as the testing temperature increases from 20 to 482 °C.

    4. In-Situ Precipitated Nanocrystal Beneficial to Enhanced Plasticity of Cu-Zr Based bulk Metallic Glasses (pages 943–950)

      L. Zhang, F. Jiang, D. Zhang, L. He, J. Sun, J. Fan and Z.-F. Zhang

      Version of Record online: 27 OCT 2008 | DOI: 10.1002/adem.200800123

      Thumbnail image of graphical abstract

      Lattice block structure panels with of a core separating two plates, both consisting of 3.2 mm diameter struts, were produced by investment casting of Ti-6Al-2Sn-4Zr-2Mo. Individual struts exhibit a microstructure and mechanical properties in compression and bending comparable to the bulk cast alloy. The panels show a decrease in compressive strength (from 35 to 17 MPa) and an increase in compressive ductility as the testing temperature increases from 20 to 482 °C.

    5. In situ Neutron Diffraction Study of Internal Micro-Stresses Developed by Plastic Elongation in <110> Textured BCC Wires (pages 951–954)

      J. Gil Sevillano, J. Alkorta, D. González, S. Van Petegem, U. Stuhr and H. Van Swygenhoven

      Version of Record online: 27 OCT 2008 | DOI: 10.1002/adem.200800209

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      By in situ neutron diffraction during tensile tests of a strongly <100> textured Nb wire, we have shown the development of internal tensile microstresses of the order of 20 % of the flow stress, acting normal to the longitudinally aligned {110} planes. Such stresses are retained as residual stresses upon unloading. They must be taken into account for preventing splitting failures of high strength BCC wires (e.g., highly drawn tungsten filaments or pearlitic steel wires) that, because of the drawing fabrication process, contain a high density of longitudinally oriented brittle interfaces.

    6. EBSD Study on Deformation Twinning in AZ31 Magnesium Alloy During Quasi-in-Situ Compression (pages 955–960)

      H. J. Yang, S. M. Yin, C. X. Huang, Z. F. Zhang, S. D. Wu, S. X. Li and Y. D. Liu

      Version of Record online: 27 OCT 2008 | DOI: 10.1002/adem.200800111

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      In this paper, the authors use the electron back-scatter diffraction (EBSD) technique to study the evolution of texture and microstructure during the deformation twinning process of AZ31 magnesium alloy under quasi-in-situ compression to several strain levels along two different directions. The aims of the current study were to analyze the influence of initial texture, grain size and plastic strain on the deformation twinning behavior.

    7. Microstructure and Mechanical Properties of an AA6181-T4 Aluminium Alloy to HC340LA High Strength Steel Friction Stir Overlap Weld (pages 961–972)

      R. S. Coelho, A. Kostka, S. Sheikhi, J. dos Santos and A. R. Pyzalla

      Version of Record online: 27 OCT 2008 | DOI: 10.1002/adem.200800028

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      Friction stir welding (FSW) of dissimilar joints offers serveral advantages over conventional fusion joining techniques since no associated melting is involved. In this study, FSW was applied to join AA6181-T4 aluminium alloy to HC340LA high strength steel and a systematic investigation of the microstructure formation, the development of FexAly intermetallic compounds and their influences on the mechanical behaviour is presented. Based on fractography analyses, a possible failure scenario for the joint during shear test is also proposed.

    8. Microstructure Characterisation of Electrical Discharge Craters using FIB/SEM Dual Beam Techniques (pages 973–977)

      N. Jeanvoine, C. Holzapfel, F. Soldera and F. Mücklich

      Version of Record online: 27 OCT 2008 | DOI: 10.1002/adem.200800108

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      This paper presents the characterisation of erosion craters caused by high voltage ignition discharges on the surface of electrodes. By means of FIB/SEM dual beam techniques such as FIB-cross sectioning, FIB-nanotomography and FIB-EBSD, the microstructure modification below the crater surface is investigated, providing new insights into erosion crater phenomena. It demonstrates also that the use of FIB/SEM is ideally suited for assessing the microstructural nature of sub-micron surface degradation features.

    9. Ab initio Physical Analysis of Single Dimensional Laser Machining of Silicon Nitride (pages 978–981)

      A. N. Samant and N. B. Dahotre

      Version of Record online: 7 OCT 2008 | DOI: 10.1002/adem.200800146

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      The capability of pulsed Nd:YAG lasers to carry out the machining of Si3N4 was explored in this study. An ab initio integrated machining model was developed by taking into account the in-situ physical phenomena such as evaporation and decomposition of the ceramic and effect of their recoil pressure on the melt pool expulsion. The model based machined depth prediction for a given number of pulses was in close agreement with the actual measured depth of the machined cavity, thus rendering the model useful for advance machined depth predictions under a given set of processing conditions.

    10. Nickel Sheets from Suspensions of the Metallic Powders in Water (pages 982–985)

      M. Mora, R. Moreno and A. J. Sánchez-Herencia

      Version of Record online: 7 OCT 2008 | DOI: 10.1002/adem.200800107

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      Based on the optimum dispersion conditions of nickel particles in water, metal sheets are processed by tape casting of the aqueous slurries. Binder removal and oxidation competition are studied in green tapes by thermogravimetric analysis. Sintering process under reductive atmosphere is studied by dilatometry. Finally close to theoretical density (∼ 99% th) nickel tapes with thickness of around 500 μm is obtained.

    11. High Performance SiC Oxidation Protective Coating with ZrO2 Particle Dispersion for Carbon/Carbon Composites (pages 986–989)

      Y.-L. Zhang, H.-J. Li, Q.-G. Fu and K.-Z. Li

      Version of Record online: 27 OCT 2008 | DOI: 10.1002/adem.200800016

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      High performance SiC oxidation protective coating with ZrO2 particle dispersion for C/C composites was prepared by slurry and pack cementation. Isothermal oxidation tests at 1873 K in air showed that the as-prepared coating could effectively protect C/C composites from oxidation for 100 h. The excellent oxidation protective ability can be attributed to the introduction of ZrO2 particles in the SiC coating, which can baffle the enlargement of cracks and suppress the generation of the thermal stress.

  6. Inside Front Cover

    1. Top of page
    2. Cover Picture
    3. Contents
    4. Review
    5. Research News
    6. Communications
    7. Inside Front Cover
    8. Review
    9. Communications
    1. Inside Front Cover Advanced Biomaterials 2/2008)

      Version of Record online: 27 OCT 2008 | DOI: 10.1002/adem.200890028

  7. Review

    1. Top of page
    2. Cover Picture
    3. Contents
    4. Review
    5. Research News
    6. Communications
    7. Inside Front Cover
    8. Review
    9. Communications
    1. Biomaterial Interface Investigated by Electrochemical Impedance Spectroscopy (pages B33–B46)

      M. Moisel, M. A. F. L. de Mele and W.-D. Müller

      Version of Record online: 27 OCT 2008 | DOI: 10.1002/adem.200800184

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      Electrochemical impedance spectroscopy (EIS) is a fast non-destructive technique to investigate biomaterial interfaces. The behaviour of artificial membranes, cells and different biomolecules such as proteins, enzymes, or nucleic acids adsorbing at biomaterial interfaces can be determined. Electrochemical processes can be modelled by an equivalent circuit and various parameters reflecting certain properties of the interface can be determined.

  8. Communications

    1. Top of page
    2. Cover Picture
    3. Contents
    4. Review
    5. Research News
    6. Communications
    7. Inside Front Cover
    8. Review
    9. Communications
    1. Characterization of Phospholipid Bilayers on Ti-6Al-4V and Ti-6Al-7Nb (pages B47–B52)

      D. Pressl, C. Teichert, G. Hlawacek, H. Clemens, P. P. Iliev, A. Schuster, F. Feyerabend and R. Willumeit

      Version of Record online: 27 OCT 2008 | DOI: 10.1002/adem.200800103

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      In this paper the authors investigate the idea if cellular interaction with the surface of titanium alloys can be influenced by the combination of substrate roughness and a bio-membrane mimic. The phospholipid 1-Palmitoyl-2-Oleoyl-sn-Glycero-3-Phospho-ethanolamine (POPE) is used as coating for titanium alloy surfaces. It forms terrace like structures and increases MG63 cell adhesion.

    2. Effects of Titania Content and Sintering Temperature on Structural, Mechanical and Bioactive Behaviors of Titania Reinforced Hydroxyapatite Nanocomposites (pages B53–B59)

      W. Que, K. A. Khor, J. L. Xu and L. G. Yu

      Version of Record online: 27 OCT 2008 | DOI: 10.1002/adem.200800243

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      Preparation and characterization of TiO2 reinforced hydroxyapatite nanocomposites derived by high-energy ball milling and spark plasma sintering processes are studied. Effects of TiO2 molar content and sintering temperature on the microstructural, mechanical and bioactive behaviors of the nanocomposites are conducted and elaborated. The bioactivity of the reinforced nanocomposites with the addition of different TiO2 molar contents is evaluated by immersing the compact disks in the simulated body fluids.

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