Advanced Engineering Materials

Cover image for Vol. 12 Issue 6

June 2010

Volume 12, Issue 6

Pages 433–538, B185–B214

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Review
    6. Communications
    7. Research Articles
    8. Rapid Communication
    1. (Adv. Eng. Mater. 6/2010)

      Article first published online: 22 JUN 2010 | DOI: 10.1002/adem.201090014

      Thumbnail image of graphical abstract

      Multilayer membranes with gradient porosity allow for high-temperature hydrogen/carbon monoxide separation.

  2. Inside Front Cover

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Review
    6. Communications
    7. Research Articles
    8. Rapid Communication
    1. (Adv. Eng. Mater. 6/2010)

      Article first published online: 22 JUN 2010 | DOI: 10.1002/adem.201090015

      Thumbnail image of graphical abstract

      Regenerative medicine requires a control of the adesion, migration and differentiation of cells for fabricating artificial tissues. Here, an accurate positioning and control of the cell fate is achieved by a one-step fabrication technique based on the geometrically controlled functionalization of Teflon-AF surface with Extra Cellular Matrix proteins by Lithographycally Controlled Wetting. Neural cells are positioned with high accuracy onto these substrates and patterns are mainteined over long incubation times without any passivation of the surface.

  3. Contents

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Review
    6. Communications
    7. Research Articles
    8. Rapid Communication
    1. (Adv. Eng. Mater. 6/2010)

      Article first published online: 22 JUN 2010 | DOI: 10.1002/adem.201090016

  4. Review

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Review
    6. Communications
    7. Research Articles
    8. Rapid Communication
    1. Global Techniques for Characterizing Phase Transformations – A Tutorial Review (pages 433–446)

      Michel Perez, Olivier Lame and Alexis Deschamps

      Article first published online: 20 MAY 2010 | DOI: 10.1002/adem.201000039

      Thumbnail image of graphical abstract

      In parallel with local experimental techniques, it is important to use and develop global techniques that investigate the response of the whole sample to a stimulus. This paper aims at providing researchers with a panorama of several global techniques that can be used for the characterization of solid–solid phase transformations. The authors intended to present these techniques in a rather accessible and pedagogical manner.

  5. Communications

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Review
    6. Communications
    7. Research Articles
    8. Rapid Communication
    1. Microstructural Characterization of Lamellar Features in TiAl by FIB Imaging (pages 447–452)

      Dennis Peter, Gunther Eggeler and Martin Franz-Xaver Wagner

      Article first published online: 6 APR 2010 | DOI: 10.1002/adem.200900339

      Thumbnail image of graphical abstract

      A novel experimental procedure is introduced to determine phase fractions and the distribution of individual phases of two-phase TiAl alloys. The special FIB-based preparation procedure results in high contrast ion beam-induced images and allows to quantify the phase contents easily by automated microstructural analysis. We compare the FIB-derived data to results obtained by EBSD. The FIB-based technique generally provides slightly higher α2-fractions, and thus helps to overcome the limited lateral resolution near grain boundaries and interfaces associated with the conventional EBSD approach. Our study demonstrates that the FIB-based technique is a simple, fast, and more exact way to determine high resolution microstructural characteristics in two-phase TiAl alloys.

    2. Localization Events and Microstructural Evolution in Ultra-Fine Grained NiTi Shape Memory Alloys during Thermo-Mechanical Loading (pages 453–459)

      Andreas Schaefer, Martin Franz-Xaver Wagner, Jorge Luis Pelegrina, Jürgen Olbricht and Gunther Eggeler

      Article first published online: 22 JUN 2010 | DOI: 10.1002/adem.201000063

      Thumbnail image of graphical abstract

      The alternating current potential drop (ACPD) technique is used to analyze the change in electrical resistance of ultra-fine grained NiTi wires subjected to a broad range of thermo-mechanical load cases. We monitor the ACPD signals in several zones along the gauge length of specimens, and we demonstrate that a localized type of transformation is a generic feature of pseudoelastic as well as of shape memory deformation. Moreover, the ACPD signals allow to differentiate between temperature-induced martensite (formed during cooling at no or relatively small loads), stress-induced martensite, and reoriented martensite (formed under load at low temperatures).

    3. Perforated Sheets Exhibiting Negative Poisson's Ratios (pages 460–464)

      Joseph N. Grima and Ruben Gatt

      Article first published online: 22 JUN 2010 | DOI: 10.1002/adem.201000005

      Thumbnail image of graphical abstract

      Sheets made from readily available conventional materials containing diamond or star shaped perforations are shown to exhibit various Poisson's ratio values which could also be negative (auxetic). This behavior may be exhibited in both tension and compression and can be explained through models based on “rotating rigid units”. This provides an easy manner for manufacturing systems which can be tailor made to exhibit particular values of the Poisson's ratio.

    4. Dynamic Collapse Mechanisms in Metal Foam Expansion (pages 465–471)

      Dirk Lehmhus

      Article first published online: 22 JUN 2010 | DOI: 10.1002/adem.201000055

      Thumbnail image of graphical abstract

      An alternative perspective on collapse in blowing agent-base metal foams is suggested. Simulation of gas evolution rates for arbitrary temperature cycles in foaming are linked to experimental data on time and temperature of collapse. The concept of a critical cell wall thinning rate is derived. This rate is believed to influence the initiation of collapse, thus limiting the maximum levels of expansion achievable for given matrix alloys and processing conditions.

    5. Al and Zn Foams Blown by an Intrinsic Gas Source (pages 472–477)

      M. Mukherjee, F. Garcia-Moreno, C. Jiménez and J. Banhart

      Article first published online: 6 APR 2010 | DOI: 10.1002/adem.201000017

      Thumbnail image of graphical abstract

      A method has been developed to produce Al- and Zn-based foams with a uniform distribution of small cells by using pre-alloyed AlMg50 powder that contains hydrogen. AlMg50 powder releases gas uniformly in the entire sample causing nucleation of a large number of cells and finally results in a uniform cell structure. The expansion behavior and structure of these foams have been studied. The foams show high compression strength.

    6. Thermal Shock Performance of Fine Grained Al2O3 Ceramics With TiO2 and ZrO2 Additions for Refractory Applications (pages 478–485)

      Christos G. Aneziris, Steffen Dudczig, Nora Gerlach, Harry Berek and Dániel Veres

      Article first published online: 23 APR 2010 | DOI: 10.1002/adem.201000037

      Thumbnail image of graphical abstract

      Due to zirconia and titania additions carbon-free fine grained alumina ceramics are produced with superior thermal shock performance. The decomposition of Al2TiO5 in the alumina doped matrix dominates during thermal shock attack and leads to higher strengths in comparison to the as sintered samples after thermal shock. EDX, EBSD, and XRD investigations describe the phase evolution before and after quenching the samples from 950 and 1200 °C in water, respectively.

    7. Screening of the Interactions Between Mg-PSZ and TRIP-Steel and Its Alloys During Sintering (pages 486–492)

      Christian Weigelt, Sarah Giersberg, Claudia Wenzel and Christos G. Aneziris

      Article first published online: 20 MAY 2010 | DOI: 10.1002/adem.200900303

      Thumbnail image of graphical abstract

      Composite materials of magnesia partially stabilized zirconia with metal additives are produced by uniaxial pressing technology and sintering. The influence of adding 10 vol% main alloying elements of austenitic Cr[BOND]Ni[BOND]steel on phase composition and microstructure is examined with help of REM/EDS and XRD measurements. Additions of Cr, Ni, Fe, and steel result in destabilization or negligible effects. Only manganese is found to stabilize zirconia promoting transformation toughening effects in compound materials.

    8. Fabrication and Microstructure of C/Cu Composites (pages 493–496)

      Yiwen Liu, Chengyu Zhang, Shengru Qiao and Zhimao Yang

      Article first published online: 22 JUN 2010 | DOI: 10.1002/adem.200900288

      Thumbnail image of graphical abstract

      C/Cu composites are prepared by melting infiltration. The microstructures of the composites and interface between C and Cu are investigated by XRD, SEM, EDS and HRTEM (see image). The results show that Ti and Cr improves wettability between Cu and C[BOND]C preform greatly. An interface mainly composed of TiC can be found between Cu and carbon fiber.

    9. Effects of Aging on Interfacial Microstructure and Reliability Between SnAgCu Solder and FeNi/Cu UBM (pages 497–503)

      Qing-Sheng Zhu, Jian-Jun Guo, Pan-Ju Shang, Zhong-Guang Wang and Jian-Ku Shang

      Article first published online: 8 JUN 2010 | DOI: 10.1002/adem.200900294

      Thumbnail image of graphical abstract

      The SnAgCu/FeNi-Cu interconnection is examined to determine the suitability of electro-deposited FeNi layer as a potential under bump metallization (UBM) in microelectronic packaging. Aged at 125 °C, the SnAgCu/FeNi-Cu interconnect exhibits an extremely slow IMC growth rate and a stable mechanical property. As an effective diffusion barrier, the electro-deposited FeNi film may be used as a reliable UBM.

    10. Microstructural Analysis of the Reinforced Al-Cu5mgti/Tib2 5 wt % Alloy for Investment Casting Applications (pages 504–508)

      Pedro Egizabal, Maider García de Cortazar, Joël Douin, Amaia Torregaray, Michel Lahaye, Cécil Vincent and Jean-Frangois Silvain

      Article first published online: 22 JUN 2010 | DOI: 10.1002/adem.201000031

      Thumbnail image of graphical abstract

      The paper describes the influence of 5 wt% TiB2 particles on the microstructure of an Al-Cu alloy produced by plaster casting process. The presence of TiB2 particles has a large influence in the observed microstructure and decreases the grain sizes and the porosity level. TiB2 particles also play an important role in the precipitation events of Al2Cu precipitates formed during solidification at the TiB2/Al interfaces.

    11. Temperature-Dependent Solid-State Reactions With and Without Kirkendall Effect in Al2O3/ZnO, Fe2O3/ZnO, and CoXOY/ZnO Oxide Thin Film Systems (pages 509–516)

      Andriy Zolotaryov, Silvana Goetze, Robert Zierold, Dmitri Novikov, Balaji Birajdar, Dietrich Hesse and Kornelius Nielsch

      Article first published online: 20 MAY 2010 | DOI: 10.1002/adem.201000043

      Thumbnail image of graphical abstract

      The controlled nanoscale fabrication of hollow oxide structures via solid-state reactions with Kirkendall effect is the focus of current study. The authors demonstrate an effective way to identify solid state reactions and to track the Kirkendall effect in planar thin oxide film systems produced using atomic layer deposition. Our analytical procedure is applied to study solid-state reactions in the Fe2O3/ZnO and CoXOY/ZnO thin film systems. For the first time we report on the Kirkendall effect in the Fe2O3/ZnO system during a ZnFe2O4 spinel formation accompanied by the strong ferromagnetism in the produced zinc ferrite.

    12. Fractal Approach to Hierarchically Evolved Laser Processed CaP Coatings (pages 517–521)

      Anil Kumar Kurella and Narendra Dahotre

      Article first published online: 20 MAY 2010 | DOI: 10.1002/adem.200900347

      Thumbnail image of graphical abstract

      Hierarchically textured surfaces are interesting from a biocompatibility perspective. Using laser surface engineering a multi-scale textured calcium phosphate coating is achieved on Ti alloy surfaces. Fractal analysis of these surfaces indicates the extent of multi-scaled evolution can be controlled by laser processing speed. Biomimetic precipitation as shown in the figure suggests the fractal nature of the calcium phosphate precipitation on the process. Surfaces as shown in the figure that exhibit multi-scaled features promote enhanced biomimetic precipitation.

    13. Multilayer Amorphous-Si-B-C-N/γ-Al2O3/α-Al2O3 Membranes for Hydrogen Purification (pages 522–528)

      Ravi Mohan Prasad, Yuji Iwamoto, Ralf Riedel and Aleksander Gurlo

      Article first published online: 22 JUN 2010 | DOI: 10.1002/adem.201000095

      Thumbnail image of graphical abstract

      The hydrogen/carbon monoxide separation is an important step in the hydrogen production process. If H2 can be selectively extracted from the product side during hydrogen production in membrane reactors, then it would be possible to achieve complete CO conversion in a single-step under high temperature conditions. Multilayer amorphous-Si-B-C-N/γ-Al2O3/α-Al2O3 membranes with gradient porosity exhibit H2/CO permselectivity of about 10.5 at 440 °C which—in combination with thermal stability of Si-B-C-N ceramics up to 1100–1500 °C—is especially promising for high temperature applications.

    14. Strain-Gradient Elasticity for Bridging Continuum and Atomistic Estimates of Stiffness of Binary Lennard-Jones Crystals (pages 529–533)

      Andrei A. Gusev and Sergey A. Lurie

      Article first published online: 5 MAY 2010 | DOI: 10.1002/adem.201000004

      Thumbnail image of graphical abstract

      Lagrangian variational approach is employed to derive the equations of equilibrium of continuum strain-gradient elasticity. For a periodic lamellar-morphology strain-gradient medium, we obtain an exact formula for the overall, system stiffness. We compare the formula with direct molecular-mechanics estimates of stiffness of binary Lennard-Jones crystals. Remarkably, the comparison reveals that the strain-gradient solution remains fairly accurate for all the crystals studied, including those with order of unity atoms in the crystal unit cell. Thus, one can surmise that the strain-gradient correction alone can already be sufficient to extend the validity of continuum-level elasticity to near atomistic length scales.

    15. Preparation and Tribological Properties of MoS2 Nanosheets (pages 534–538)

      Zhuangzhi Wu, Dezhi Wang, Yi Wang and Aokui Sun

      Article first published online: 22 JUN 2010 | DOI: 10.1002/adem.201000127

      Thumbnail image of graphical abstract

      MoS2 nanosheets were successfully synthesized by a micro-domain reaction method, employing a ball-milled mixture of MoO3 and S as staring materials. And they showed excellent tribological performances as an additive in base oils due to their special morphology and structure.

  6. Research Articles

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Review
    6. Communications
    7. Research Articles
    8. Rapid Communication
    1. Stable Non-Covalent Large Area Patterning of Inert Teflon-AF Surface: A New Approach to Multiscale Cell Guidance (pages B185–B191)

      Francesco Valle, Beatrice Chelli, Michele Bianchi, Pierpaolo Greco, Eva Bystrenova, Ilaria Tonazzini and Fabio Biscarini

      Article first published online: 22 JUN 2010 | DOI: 10.1002/adem.201080022

      Thumbnail image of graphical abstract

      Regenerative medicine requires a control of the adhesion, migration, and differentiation of cells for fabricating artificial tissues. Here, an accurate positioning and control of the cell fate is achieved by a one-step fabrication technique based on the geometrically controlled functionalization of Teflon-AF surface with extra cellular matrix proteins by lithographically controlled wetting. Neural cells are positioned with high accuracy onto these substrates and patterns are mainteined over long incubation times without any passivation of the surface.

    2. Elaboration of Monophasic and Biphasic Calcium Phosphate Coatings on Ti6Al4V Substrate by Pulsed Electrodeposition Current (pages B192–B199)

      Hicham Benhayoune, Richard Drevet, Joel Fauré, Sylvain Potiron, Thierry Gloriant, Hassane Oudadesse and Dominique Laurent-Maquin

      Article first published online: 6 MAY 2010 | DOI: 10.1002/adem.200980058

      Thumbnail image of graphical abstract

      In this study, calcium phosphate coatings were prepared by pulsed electrodeposition current methods. The physico-chemical and the structural analysis were performed respectively by complementary SEM - EDS, TEM - SAED and XRD. The results showed that the obtained coatings were uniform and composed of two phases: stoichiometric hydroxyapatite (HAP) and β-tricalcium phosphate (β-TCP) while the addition of 9% H2O2 amount into electrolyte led to monophasic coatings made of stoichiometric hydroxyapatite (HAP).

    3. Proteolytically Degradable Photo-Polymerized Hydrogels Made From PEG–Fibrinogen Adducts (pages B200–B209)

      Daniel Dikovsky, Havazelet Bianco-Peled and Dror Seliktar

      Article first published online: 22 JUN 2010 | DOI: 10.1002/adem.200980054

      Thumbnail image of graphical abstract

      The structure of biosynthetic PEG–fibrinogen hydrogels is explored by studying the kinetics of photo-polymerization, the degree of swelling in different buffers, and the mechanical and degradation properties. The network cross-linking kinetics and final network structural properties of the PEG–fibrinogen material are related to the PEG characteristics and the overall network volume fraction. The protein backbone of the material permits complete resorption of the polymer network in the presence of proteolytic enzymes, but also affects the network structure by introducing complex hydrophobic interactions and steric hindrances during the cross-linking reaction of polymer network formation.

  7. Rapid Communication

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Review
    6. Communications
    7. Research Articles
    8. Rapid Communication
    1. Facile Functionalization and Phase Reduction Route of Magnetic Iron Oxide Nanoparticles for Conjugation of Matrix Metalloproteinase (pages B210–B214)

      Dan Li, Wey Yang Teoh, Diana Djunaedi, Jolen Justin Gooding, Cordelia Selomulya and Rose Amal

      Article first published online: 22 JUN 2010 | DOI: 10.1002/adem.200980049

      Thumbnail image of graphical abstract

      Fe3O4 nanoparticles with distal thiol moieties were synthesized from the simultaneous silanization and reduction of preformed γ-Fe2O3, allowing effective conjugation of matrix metalloproteinase for potential use in magneto-chemotherapeutic applications.

SEARCH

SEARCH BY CITATION