Advanced Engineering Materials

Cover image for Vol. 14 Issue 9

September 2012

Volume 14, Issue 9

Pages 755–829

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Masthead
    4. Contents
    5. Communications
    1. Front Cover Advanced Engineering Materials 9/2012

      Article first published online: 3 SEP 2012 | DOI: 10.1002/adem.201290032

      Thumbnail image of graphical abstract

      The cover illustrates the formation of silver clusters which self-assemble to 2D- and 3D-patterns. The different states of assembly are shown by electron microscopy pictures. Further details can be found in the article by M. Veith et al.

  2. Masthead

    1. Top of page
    2. Cover Picture
    3. Masthead
    4. Contents
    5. Communications
    1. Adv. Eng. Mater. 9/2012

      Article first published online: 3 SEP 2012 | DOI: 10.1002/adem.201290033

  3. Contents

    1. Top of page
    2. Cover Picture
    3. Masthead
    4. Contents
    5. Communications
    1. Adv. Eng. Mater. 9/2012 (pages 755–757)

      Article first published online: 3 SEP 2012 | DOI: 10.1002/adem.201290031

  4. Communications

    1. Top of page
    2. Cover Picture
    3. Masthead
    4. Contents
    5. Communications
    1. Revisited Storage and Dynamic Recovery of Dislocation Density Evolution Law: Toward a Generalized Kocks–Mecking Model of Strain-Hardening (pages 759–761)

      O. Bouaziz

      Article first published online: 18 MAY 2012 | DOI: 10.1002/adem.201200083

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      The current work extends the well established approach of Kocks and Mecking by a more realistic description of strain-hardening using an original dislocation density law with a revisited physical understanding of dynamic recovery, without new material parameters and keeping only one internal variable. First validation shows that the new approach is more consistent with experiments than the common Kocks–Mecking modeling with the same number of parameters.

    2. Temperature and Texture Development during High Speed Friction Stir Processing of Magnesium AZ31 (pages 762–771)

      Leon Leander Hütsch, Jakob Hilgert, Klaas Herzberg, Jorge dosSantos and Norbert Huber

      Article first published online: 19 JUL 2012 | DOI: 10.1002/adem.201200112

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      The possibility of subjecting Mg AZ31 sheet material to HS-FSP with speeds ranging from 1 to 10 m · min−1 is examined. Energy input investigations reveal a two phase regime reaching a threshold at processing speeds of 5 m · min−1 in which previously observed changes as temperature distribution, plate distortion, microstructure, and texture evolution are minimized, opening up the possibility of tailoring microstructure at industrially interesting processing speeds.

    3. Flammability of Mg–X Binary Alloys (pages 772–784)

      Arvind Prasad, Zhiming Shi and Andrej Atrens

      Article first published online: 23 MAY 2012 | DOI: 10.1002/adem.201200124

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      One end of a horizontal cylindrical specimen was subjected to a liquid petroleum gas (LPG) flame. There was no burning without melting. Mg–5%Gd, Mg–3%Ca, and Mg–5%Ca resisted burning. Otherwise, on sufficient LPG flame exposure, there was melting and specimen tip ignition. Any hot detached blob continued to burn until consumed, except for Mg–1%Ca, Mg–3%La, Mg–3%Ce, and Mg–5%Nd. The burning specimen tip extinguished upon withdrawal of the LPG flame.

    4. Enhanced Grain Refinement Through Deformation Induced α Precipitation in Hot Working of α + β Titanium Alloy (pages 785–789)

      Bin Liu, Yunping Li, Hiroaki Matsumoto, Yuichiro Koizumi, Yong Liu and Akihiko Chiba

      Article first published online: 19 JUL 2012 | DOI: 10.1002/adem.201200044

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      This study reports a novel forging process to fabricate bulk fine-grained (grain size ≈ 1 µm) Ti–6Al–4V alloy, in which temperatures near the β transus (Tβ) and strain rates around 0.15 s−1 are used for the deformation. The formation of fine-grained microstructure is mainly result from the deformation-induced precipitation of α grains from the β matrix.

    5. Damage Characterization of Thermal Barrier Coatings by Acoustic Emission and Thermography (pages 790–794)

      Daniel Nies, Birgit Rehmer, Birgit Skrotzki and Robert Vaßen

      Article first published online: 20 JUL 2012 | DOI: 10.1002/adem.201200107

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      Thermal fatigue tests of thermal barrier coatings (TBCs) by heating the surface with laser irradiation were complemented by nondestructive methods. A comparison is made between results of acoustic emission and thermographic images in order to visualize the formation and evolution of damage through delamination in the samples.

    6. Fabrication and High Temperature Creep Behaviour of Interpenetrated Nickel–Chromium/Alumina Composites (pages 795–801)

      Andreas Haeger, Karl G. Schell, Alwin Nagel, Ethel C. Bucharsky, Rainer Oberacker and Michael J. Hoffmann

      Article first published online: 20 JUN 2012 | DOI: 10.1002/adem.201200055

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      Synthesis of a new metal matrix composite (MMC) based on a nickel–chromium matrix reinforced with particulate alumina preforms is reported. This composite with an interpenetrated microstructure was fabricated by high temperature squeeze casting at 1550 °C (HTSC). Microstructure and mechanical properties are presented. Bending creep properties at temperatures up to 1150 °C demonstrate outstanding creep resistance compared to a commercial nickel superalloy.

    7. Pressureless Sintering of TiB2-Based Ceramics with Ti–Fe Additives: Sintering Mechanism and Stability in Liquid Aluminum (pages 802–809)

      Hamed Heidari, Houshang Alamdari, Dominique Dubé and Robert Schulz

      Article first published online: 20 JUN 2012 | DOI: 10.1002/adem.201200067

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      TiB2-based ceramics consolidate via pressureless sintering using Ti, Fe and Ti–Fe additives. Only the specimens sintered with a Ti–Fe alloy suggests as potentially reliable wettable cathodes for aluminum electrolysis. TEM analysis reveals that the formation of inter-particle bridges of pure TiB2 is responsible for the excellent stability of this material in molten aluminum.

    8. Category Theory Based Solution for the Building Block Replacement Problem in Materials Design (pages 810–817)

      Tristan Giesa, David I. Spivak and Markus J. Buehler

      Article first published online: 20 JUN 2012 | DOI: 10.1002/adem.201200109

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      Material ologs, mathematical descriptions of hierarchical materials, define a process by which material building blocks are replaced by others while maintaining large-scale properties, to the extent possible. We demonstrate the implementation of this approach by using category-theoretic and algebraic techniques to predict the specific conditions needed to find functionally optimized material solutions.

    9. Shape-Memory Properties of Polyetherurethane Foams Prepared by Thermally Induced Phase Separation (pages 818–824)

      Tilman Sauter, Karola Lützow, Michael Schossig, Hans Kosmella, Thomas Weigel, Karl Kratz and Andreas Lendlein

      Article first published online: 24 MAY 2012 | DOI: 10.1002/adem.201200127

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      The structure of foams prepared from amorphous polyetherurethane via thermally induced phase separation could be adjusted by application of different cooling protocols. Shape-memory investigations on the macro- and microscale revealed an improved shape-memory capability for hierarchically structured foams (PEUfc), which can be attributed to an increased energy storage capability compared to foams with homogeneous pore size distribution (PEUsc).

    10. Synthesis of Monodisperse Silver Nanoparticles by Sonolysis of Silver Carboxylates (pages 825–829)

      Michael Veith, Karsten Moh and Christian Cavelius

      Article first published online: 20 JUN 2012 | DOI: 10.1002/adem.201200111

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      In this study, silver nanoparticles with narrow size distribution were synthesized by sonolytically assisted decomposition of silver oxalate and oleate using a wet chemical approach. Their ability to form regular patterns via self-assembly was observed by electron microscopy. The decomposition characteristics of the different precursor compounds were investigated using UV–Vis spectroscopy and thermogravimetry.

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