Advanced Engineering Materials

Cover image for Vol. 15 Issue 8

August 2013

Volume 15, Issue 8

Pages 661–779

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Masthead
    4. Contents
    5. Review
    6. Communications
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      Front Cover Advanced Engineering Materials 8/2013 (page 661)

      Torben Halfer, Huanjun Zhang, Lutz Mädler and Kurosch Rezwan

      Version of Record online: 2 AUG 2013 | DOI: 10.1002/adem.201370020

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      The cover graphic shows the scheme of a novel ceramic mask-assisted flame spray pyrolysis (CMA-FSP) which allows particle deposition with high local precision on planar substrates and scanning electron microscope (SEM) images of a particle agglomerate, a cylindrical structure of the patterned thin ceramic mask and a hemispherical porous nanoparticle spot sprayed on a glass substrate. For further details see the article by Kurosch Rezwan et al. on page 773.

  2. Masthead

    1. Top of page
    2. Cover Picture
    3. Masthead
    4. Contents
    5. Review
    6. Communications
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      Adv. Eng. Mater. 8/2013 (page 783)

      Version of Record online: 2 AUG 2013 | DOI: 10.1002/adem.201370021

  3. Contents

    1. Top of page
    2. Cover Picture
    3. Masthead
    4. Contents
    5. Review
    6. Communications
    1. You have free access to this content
      Adv. Eng. Mater. 8/2013 (pages 663–667)

      Version of Record online: 2 AUG 2013 | DOI: 10.1002/adem.201370022

  4. Review

    1. Top of page
    2. Cover Picture
    3. Masthead
    4. Contents
    5. Review
    6. Communications
    1. Considerations of Microstructural Influences for Diffusion Welding of Metals in Microsystem Technology (pages 669–683)

      Thomas Gietzelt, Volker Toth, Heinz Lambach and Roland Dittmeyer

      Version of Record online: 12 APR 2013 | DOI: 10.1002/adem.201200339

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      The paper gives a summary of several processes inside the material during and affecting the result of the diffusion welding process. The relation between the materials microstructural defects, the materials history arising from manufacturing processes as well as the surface condition of the material and its impact on diffusion processes are discussed in detail. Specific considerations of diffusion welding for microsystem technology are considered. The literature and different approaches of diffusion welding are evaluated.

  5. Communications

    1. Top of page
    2. Cover Picture
    3. Masthead
    4. Contents
    5. Review
    6. Communications
    1. Mechanics of Pharyngeal Teeth of Black Carp (Mylopharyngodon piceus) Crushing Mollusk Shells (pages 684–690)

      Chong He, Wu Zhou, Hongtao Wang, San-Qiang Shi and Haimin Yao

      Version of Record online: 4 MAR 2013 | DOI: 10.1002/adem.201200304

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      Mylopharyngodon piceus, or black carp, is a species of fish mainly feeding on mollusks, which are commonly protected by hard exoskeleton. Why can the black carp crush the hard mollusk shells at ease? Does such unique diet imply that its teeth are superior to the mollusk shells in mechanical properties? Present mechanics-based study on the competition between black carp teeth and mollusk shells comes up with the answers.

    2. A New Centimeter-Sized Ti-Based Quaternary Bulk Metallic Glass with Good Mechanical Properties (pages 691–696)

      Pan Gong, Kefu Yao, Xin Wang and Yang Shao

      Version of Record online: 18 MAR 2013 | DOI: 10.1002/adem.201200391

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      We report a new centimeter-sized Ti40Zr26Be28Fe6 bulk metallic glass with a large supercooled liquid region of 100 K. This glassy alloy also possesses excellent mechanical properties such as a high specific strength of 4.03 × 105 Nm kg−1 and an obvious compressive plastic strain of 7.4%, which make it possible to be used as novel aerospace materials.

    3. Effects of Thermally Induced Cyclic γ[LEFT RIGHT ARROW]ε Transformation on Shape Memory Effect of a Quenched FeMnSiCrNi Alloy (pages 697–703)

      Qin Yang, Qinxu Yu, Huabei Peng and Yuhua Wen

      Version of Record online: 4 MAR 2013 | DOI: 10.1002/adem.201200358

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      A optical micrograph showing some lenticular α′ martensite (dark) produced inside the block thermal ε martensite (white) and many granular α′ martensite (dark) introduced at the intersections of different direction ε martensite bands after 5% deformation in a quenched Fe14Mn5.5Si8.0Cr5.0Ni alloy.

    4. Nanoindentation Characterization of the Hardness of Zirconia Dental Ceramics (pages 704–707)

      Longquan Shao, Danyu Jiang and Jianghong Gong

      Version of Record online: 4 MAR 2013 | DOI: 10.1002/adem.201200367

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      Nanoindentation tests were conducted on four commercial zirconia dental ceramics. For each material, the measured nanohardness exhibits significant indentation size effect. The so-called load-independent nanohardness was determined based on a second-order polynomial analysis of the variation of the contact depth with the peak load. Finally, a brief discussion was conducted on the reliability and the applicability of the determined load-independent nanohardness.

    5. Processing and Characterization of In Situ (TiC–TiB2)p/AZ91D Magnesium Matrix Composites (pages 708–717)

      Mohammed Shamekh, Martin Pugh and Mamoun Medraj

      Version of Record online: 14 MAR 2013 | DOI: 10.1002/adem.201200203

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      In this work, magnesium matrix composites reinforced with a TiC–TiB2 network have been fabricated using in situ reactive infiltration technique. Relatively uniform distribution of TiB2 and TiC particulates in the Mg matrix was observed. Compared with those of the unreinforced AZ91D alloy, the elastic modulus, flexural and compressive strengths of the composite are greatly improved. However, their low ductility was improved by the addition of MgH2 powder in the preform.

    6. Chemically Tuning Mechanics of Graphene by BN (pages 718–727)

      Qing Peng, Xiao-Jia Chen, Wei Ji and Suvranu De

      Version of Record online: 3 APR 2013 | DOI: 10.1002/adem.201300033

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      The mechanical properties of graphene are modified by g-BN concentration, providing guidance to optimize graphene-based nanodevices. The in-plane stiffness and third order elastic constants can be linearly tuned. The longitudinal mode elastic constants are sensitive to the BN modification. The third, fourth, and fifth order elastic constants are required for strains larger than 0.02, 0.06, and 0.12, respectively.

    7. Sandwich Panels with a Core Segmented into Topologically Interlocked Elements (pages 728–731)

      Andrey Molotnikov, Ralf Gerbrand, Olivier Bouaziz and Yuri Estrin

      Version of Record online: 2 APR 2013 | DOI: 10.1002/adem.201300002

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      A novel principle of design of sandwich panels utilizing segmentation of a monolithic core into a set of building blocks with a specially designed shape is proposed. Our investigation shows that segmentation of a monolithic sandwich core made from polyurethane into an assembly of interlocked osteomorphic blocks brings about a remarkable increase in the deflection to failure and in the energy absorption capability of a sandwich panel.

    8. A Critical Assessment of Experimental Methods for Determining the Dynamic Mechanical Characteristics of Shape Memory Polymers (pages 732–739)

      Rasa Kazakevičiūtė-Makovska, Safa Mogharebi, Holger Steeb, Gunther Eggeler and Klaus Neuking

      Version of Record online: 2 APR 2013 | DOI: 10.1002/adem.201200341

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      Shape memory polymer Tecoflex™ is experimentally investigated by running DMA tests in three distinct deformation modes, uniaxial tension, three-point bending, and simple torsion, using two test rigs, Eplexor 500N of Gabo Qualimeter® and Modular Compact Rheometer MCR-301 of Anton Paar. It is observed that the temperature-dependent storage and loss moduli measured in different deformation modes show certain discrepancies that cannot be easily reconciled.

    9. Experimental Study on Energy Dissipation Characteristics of ZSM-5 Zeolite/Water System (pages 740–746)

      Yueting Sun, Jun Xu, Yibing B. Li, Bohan Liu, Yan Wang, Cheng Liu and Xi Chen

      Version of Record online: 8 APR 2013 | DOI: 10.1002/adem.201200350

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      Interaction with water at the ultra-large surface area of nanoporous material (zeolite ZSM-5) is utilized to establish a nanoporous energy dissipation system and studied experimentally in this paper. Results show that the pretreatment temperature of about 1000 °C, and higher ratio of ZSM-5 with larger particle size are desired for an optimum energy dissipation performance, which enables a reusable cushioning device.

    10. Influence of Anvil Alignment on Shearing Patterns in High-Pressure Torsion (pages 747–755)

      Yi Huang, Megumi Kawasaki and Terence G. Langdon

      Version of Record online: 3 APR 2013 | DOI: 10.1002/adem.201200363

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      High-pressure torsion is now a major processing method for the production of metals with ultrafine grain sizes. Experiments using a two-phase duplex stainless steel show that the flow patterns on the disk surfaces vary depending upon the amount of anvil misalignment. Specifically, shear vortices are visible when processing with a misalignment of x = 100 µm but not when the anvils are in perfect alignment.

    11. Fracture Strength of Photovoltaic Silicon Wafers Evaluated Using a Controlled Flaw Method (pages 756–760)

      Meirong Shi, Khaled Youssef and George A. Rozgonyi

      Version of Record online: 25 APR 2013 | DOI: 10.1002/adem.201200312

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      The impact of a single micro crack on the fracture strength of PV silicon wafer is investigated based on a controlled flaw method by introducing radial/median cracks with controllable scales through microindentation. Results indicate that the fracture strength of PV silicon wafer decreases linearly with the increasing of the microindentation load. It is also found that carbon plays an important role in the contact cracking-fracture process.

    12. High Temperature Deformation and Microstructural Features of TXA321 Magnesium Alloy: Correlations with Processing Map (pages 761–766)

      Chalasani Dharmendra, Kamineni Pitcheswara Rao, Yellapregada Venkata Rama Krishna Prasad, Norbert Hort and Karl Ulrich Kainer

      Version of Record online: 3 APR 2013 | DOI: 10.1002/adem.201200379

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      The hot workability of Mg-3Sn-2Ca-1Al alloy has been established through the development of its processing map based on dynamic materials model. Domains 1–3 are considered as desirable processing windows for forming this alloy due to extensive dynamic recrystallization and grain refinement. Domain 4 represents extensive grain boundary sliding, and should be avoided under stresses of tensile nature due to flow instability.

    13. Local Tomography Study of the Fracture of an ERG Metal Foam (pages 767–772)

      Tao Zhang, Eric Maire, Jerome Adrien, Patrick R. Onck and Luc Salvo

      Version of Record online: 30 APR 2013 | DOI: 10.1002/adem.201300004

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      We use X-ray tomography to investigate the fracture behavior of an ERG open cell aluminum foam. Local tomography has in particular been used to image the microstructure at high resolution showing the inter-metallic particles present in the struts. A FE model is also developed using the 3D data obtained by the tomography in order to simulate the damage process.

    14. Ceramic Mask-Assisted Flame Spray Pyrolysis for Direct and Accurate Patterning of Metal Oxide Nanoparticles (pages 773–779)

      Torben Halfer, Huanjun Zhang, Lutz Mädler and Kurosch Rezwan

      Version of Record online: 13 MAY 2013 | DOI: 10.1002/adem.201300032

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      The ceramic mask-assisted flame spray pyrolysis (CMA-FSP) is a method for creating accurate micron sized spots of different shapes by depositing of metal oxide nanoparticles directly onto user defined substrates. The patterning process uses free-standing alumina thin films with well-defined holes as reusable ceramic masks.

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