Advanced Engineering Materials

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Recently Published Articles

  1. Effect of Aging on Microstructure and Mechanical Strength of Reactive Air Brazed BSCF/AISI 314-Joints

    Anke Kaletsch, Ewald M. Pfaff and Christoph Broeckmann

    Article first published online: 22 APR 2014 | DOI: 10.1002/adem.201400102

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    Long-term application of reactive air brazed BSCF/AISI314-joints at elevated temperatures leads in a decrease of the joint strength. Tensile tests show a drop of 55% of the joint strength after aging for 500 h at 850 °C in air. Reason for that is a change in the microstructure of the ceramic at the braze interface, which is characterized by high and irregular formed porosity.

  2. Effect of Combined Micro-Alloying of Calcium and Bismuth on the Microstructure and Mechanical Properties of AM50 Magnesium Alloy

    Zhang Ya-Qing, Luo Xiao-Ping and Dang Su-E

    Article first published online: 22 APR 2014 | DOI: 10.1002/adem.201400043

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    A microstructure and mechanical properties of as-cast AM50 magnesium alloys with different content of calcium and bismuth are characterized. Optimum combination on microstructure mechanical properties is obtained, which is expected to show good mechanical properties.

  3. Precipitation in a Nanograined 7475 Aluminium Alloy—Processing, Properties and Nanoanalysis

    Malgorzata Lewandowska, Kinga Wawer, Pawel Kozikowski, Masato Ohnuma and Krzysztof J. Kurzydlowski

    Article first published online: 17 APR 2014 | DOI: 10.1002/adem.201400018

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    Precipitation strengthening in a nanograined 7475 aluminium alloy obtained by hydrostatic extrusion of water quenched samples is studies. Low temperature ageing causes precipitation processes and strengthening phenomena. However, the particle strengthening is limited by enhanced grain boundary precipitation and smaller size of precipitates.

  4. A New In Situ Microscopy Approach to Study the Degradation and Failure Mechanisms of Time-Dependent Dielectric Breakdown: Set-Up and Opportunities

    Zhongquan Liao, Martin Gall, Kong Boon Yeap, Christoph Sander, Oliver Aubel, Uwe Mühle, Jürgen Gluch, Sven Niese, Yvonne Standke, Rüdiger Rosenkranz, Markus Löffler, Norman Vogel, Armand Beyer, Hans-Jürgen Engelmann, Peter Guttmann, Gerd Schneider and Ehrenfried Zschech

    Article first published online: 17 APR 2014 | DOI: 10.1002/adem.201400088

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    An in situ approach using transmission X-ray microscopy and scanning transmission electron microscopy is developed to study the degradation and failure mechanisms of time dependent dielectric breakdown (TDDB) in copper/ultra-low-k interconnects. The metal migration is detected by the bright field imaging, and the Cu distribution is shown by the electron spectroscopic imaging. This approach contributes the improved understanding of the TDDB.

  5. Spark Plasma Sintering of Alumina Composites with Graphene Platelets and Silicon Carbide Nanoparticles

    Jian Liu, Zheng Li, Haixue Yan and Kyle Jiang

    Article first published online: 16 APR 2014 | DOI: 10.1002/adem.201300536

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    Alumina (Al2O3) ceramic composites with graphene platelets (GPLs) and silicon carbide (SiC) nanoparticles were fabricated using spark plasma sintering furnace. The addition of GPLs and SiC significantly reduce the grain size of the Al2O3 matrix. Compared with pure Al2O3, the composites show approximately a 36% increase in hardness, a 40% increase in flexural strength and a 50% increase in fracture toughness.