Advanced Engineering Materials

Cover image for Vol. 15 Issue 4

April 2013

Volume 15, Issue 4

Pages 185–307

  1. Cover Picture

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    3. Masthead
    4. Contents
    5. Reviews
    6. Communications
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      Front Cover Advanced Engineering Materials 4/2013 (page 185)

      Steferson Luiz Stares, Alina Kirilenko, Márcio Celso Fredel, Peter Greil, Lothar Wondraczek and Nahum Travitzky

      Version of Record online: 8 APR 2013 | DOI: 10.1002/adem.201370008

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      A novel bioactive glass-loaded paper was developed with the goal of fabricating structures for use in bone reconstruction. The cover shows the surface of bioactive glass bodies, which is manufactured by preceramic paper. For further details see the article by Steferson Luiz Stares et al. on page 230.

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      Adv. Eng. Mater. 4/2013 (page 186)

      Version of Record online: 8 APR 2013 | DOI: 10.1002/adem.201370009

  3. Contents

    1. Top of page
    2. Cover Picture
    3. Masthead
    4. Contents
    5. Reviews
    6. Communications
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      Adv. Eng. Mater. 4/2013 (pages 187–190)

      Version of Record online: 8 APR 2013 | DOI: 10.1002/adem.201370010

  4. Reviews

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    4. Contents
    5. Reviews
    6. Communications
    1. Design, Processing, Microstructure, Properties, and Applications of Advanced Intermetallic TiAl Alloys (pages 191–215)

      Helmut Clemens and Svea Mayer

      Version of Record online: 19 NOV 2012 | DOI: 10.1002/adem.201200231

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      Development and processing of high-temperature materials is the key to technological progress in engineering areas where materials have to meet extreme requirements. After almost three decades of intensive fundamental research and development activities, intermetallic titanium aluminides based on the ordered γ-TiAl phase have found applications in automotive and aircraft engine industry. This review gives a general survey of engineering γ-TiAl based alloys, but concentrates on β-solidifying γ-TiAl based alloys, e.g., TNM™ alloys, which show excellent hot-workability and balanced mechanical properties when subjected to adapted heat treatments.

    2. Computational Modeling of Columnar to Equiaxed Transition in Alloy Solidification (pages 216–229)

      Wajira U. Mirihanage, Huijuan Dai, Hongbiao Dong and David J. Browne

      Version of Record online: 19 OCT 2012 | DOI: 10.1002/adem.201200220

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      The columnar to equiaxed transition (CET) provides a challenging simulation goal for computational models of alloy solidification, in addition to being an important technological feature of many metal casting processes. CET thus provides an industrially relevant test-case for those developing numerical models across a range of scales. This paper presents a review of recent progress on modeling CET at multiple length scales, and computational challenges yet to be met are summarized.

  5. Communications

    1. Top of page
    2. Cover Picture
    3. Masthead
    4. Contents
    5. Reviews
    6. Communications
    1. Paper-Derived Bioactive Glass Tape (pages 230–237)

      Steferson Luiz Stares, Alina Kirilenko, Márcio Celso Fredel, Peter Greil, Lothar Wondraczek and Nahum Travitzky

      Version of Record online: 19 SEP 2012 | DOI: 10.1002/adem.201200192

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      A novel bioactive glass-loaded paper was developed with the goal of fabricating structures for use in bone reconstruction. Replacement of pulp fibers by amounts of bioactive glass fillers resulted in a discrete increase of density and porosity of the samples. By applying compressive pressures improved paper consolidation and reduction of thickness and porosity were observed, which ultimately led to improved mechanical properties of the sintered ceramic products.

    2. Evolution of Phase Strains During Tensile Loading of Bovine Cortical Bone (pages 238–249)

      Anjali Singhal, Fang Yuan, Stuart R. Stock, Jonathan D. Almer, L. Catherine Brinson and David C. Dunand

      Version of Record online: 23 OCT 2012 | DOI: 10.1002/adem.201200204

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      Synchrotron high-energy X-ray scattering was used to study the in situ load partitioning between mineral and protein phases in cortical bone as a function of sample location. The anterio-medial quadrant of the femur was found to be the stiffest. The nanoscale level load partitioning in tension was significantly different from compression, for samples from the same animal, and implied asymmetry of elasto-plastic properties of collagen in the two loading modes.

    3. In Situ Electro-Mechanical Experiments and Mechanics Modeling of Fracture in Indium Tin Oxide-Based Multilayer Electrodes (pages 250–256)

      Cheng Peng, Zheng Jia, Henry Neilson, Teng Li and Jun Lou

      Version of Record online: 18 SEP 2012 | DOI: 10.1002/adem.201200169

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      Inspired by recent development of inorganic/organic hybrid structures for flexible electronics, we design and fabricate ITO-based multilayer electrodes. Both in situ electro-mechanical experiment and mechanics model suggests that a top protective polymeric coating above and an intermediate polymeric layer below the ITO layer can effectively enhance the mechanical durability by reducing the crack driving force up to ten folds. The findings provide quantitative guidance for the material selection and structural optimization of ITO-based multilayer electrodes of high mechanical durability.

    4. Magnesiothermic Reduction Process Applied to the Powder Production of U(Mo) Fissile Particles (pages 257–261)

      Guillaume Champion, Jérôme Allenou, Mathieu Pasturel, Henri Noël, François Charollais, Marie-Christine Anselmet, Xavière Iltis and Olivier Tougait

      Version of Record online: 19 SEP 2012 | DOI: 10.1002/adem.201200235

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      We present an alternative route to produce γ-U(Mo) powder based on the magnesiothermic reduction of UO2 in presence of Mo. For heat-treatments above 750 °C, dwell periods of few hours and suitable quenching, the resulting powders displays the bcc-structure, typical size in the range 10–200 µm, absence of chemical segregation, a none-perfectly spherical shape and close porosity which may be a paramount benefit to accommodate the fission gases.

    5. Mechanical Alloying of β-Type Ti–Nb for Biomedical Applications (pages 262–268)

      Ksenia Zhuravleva, Sergio Scudino, Mohsen Samadi Khoshkhoo, Annett Gebert, Mariana Calin, Ludwig Schultz and Jürgen Eckert

      Version of Record online: 15 OCT 2012 | DOI: 10.1002/adem.201200117

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      β-Type Ti–Nb alloys (40–45 wt% Nb) with low Young's modulus are promising new materials for load bearing non-degradable implant applications. This work demonstrates that fully alloyed Ti40Nb powder can be obtained by ball milling with high yields up to 90% using NaCl as a milling agent. Principle mechanisms of mechanical alloying leading to the β-phase material and reasons for the achievement of high yields are discussed.

    6. Thin Film Synthesis of Ti3SiC2 by Rapid Thermal Processing of Magnetron-Sputtered Ti[BOND]C[BOND]Si Multilayer Systems (pages 269–275)

      Marcus Hopfeld, Rolf Grieseler, Thomas Kups, Marcus Wilke and Peter Schaaf

      Version of Record online: 18 OCT 2012 | DOI: 10.1002/adem.201200180

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      Thin film synthesis of Mn+1AXn phases, which combine metallic and ceramic properties, especially Ti3SiC2, need temperatures in the range of 800–1000 °C. The reduction of temperature influence to the substrate and the processing time of the formation of polycrystalline Ti3SiC2 is possible by adapting the rapid thermal processing technique to magnetron sputtered multilayer films of Ti, C and Si.

    7. Characterization and Simulation of Tensile Deformation of Non-Uniform Cellular Aluminium Until Damage (pages 276–286)

      Babak Foroughi, H. Peter Degischer and Andreas Kottar

      Version of Record online: 19 NOV 2012 | DOI: 10.1002/adem.201200163

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      Foamed metals exhibit a non-uniform cellular structure, which is characterized by computed X-ray tomography of low resolution applicable to large components. A material model is deduced transforming the cellular structure into 3D mass density distributions, which are converted into finite elements of different densities. Scaling laws are applied to simulate the deformation of samples submitted to tensile tests. The simulated elasto-plastic stress–strain curves agree with the experimental ones as well as the positions of predicted cracks with their observed occurrence.

    8. High-Energy X-Ray Diffraction Study of the Inhomogeneous Zr43Cu43Al7Ag7 Bulk-Metallic Glasses (pages 287–294)

      Chih-Pin Chuang, Peter K. Liaw, Ji-Jung Kai, Wojtek Dmowski, Jia-Hong Huang and Ge-Ping Yu

      Version of Record online: 19 OCT 2012 | DOI: 10.1002/adem.201200179

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      This paper shows clear evidence that nano-crystalline particles are embedded in the as-cast Zr43Cu43Al7Ag7 bulk metallic glasses with different techniques. The size and the distribution of the nano-crystalline particles in the sample are not uniform and depend on the cooling history of the sample. The comparison of the results from TEM, laboratory X-ray, and high energy synchrotron X-ray suggests that high-energy synchrotron X-ray diffraction is an effective, non-destructive method to characterize the microstructure of an amorphous nano-crystalline composite.

    9. Systematic Processing of β-Tricalcium Phosphate for Efficient Protein Loading and In Vitro Analysis of Antigen Uptake (pages 295–301)

      Vinayaraj Ozhukil Kollath, Bruno G. De Geest, Steven Mullens, Stefaan De Koker, Jan Luyten, Rosita Persoons, Karl Traina, Jean Paul Remon and Rudi Cloots

      Version of Record online: 22 NOV 2012 | DOI: 10.1002/adem.201200177

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      For the application of oral vaccination, biodegradable protein carriers are required. This study optimizes a powder processing route to increase the protein loading on β-tricalcium phosphate powder to be used as protein carrier. Linear correlation between apparent external surface area of the powder and adsorption efficiency is observed. Dendritic cell uptake showed the biocompatibility of the system to be capable as antigen carrier to these cells.

    10. The Effect of Solidification Dynamics on the Formation of the Skin in Die Cast Mg–Al and Mg–RE Alloys (pages 302–307)

      Kun Vanna Yang, Mark A. Easton and Carlos H. Cáceres

      Version of Record online: 19 NOV 2012 | DOI: 10.1002/adem.201200188

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      The Mg–La alloy evolves more solid for given temperature drop than the Mg–Al alloys, i.e., the incipient grain microstructure (black) forms a better-defined solid front in the Mg–RE alloy. The large (red) crystals pre-solidified in the shot-sleeve find it more difficult to reach the surface in the Mg-RE alloy than those facing the more mushy solidification front of the Mg–Al alloys. A more distinct skin layer in the Mg–La alloy results.

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