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Recently Published Articles

  1. On Local Phase Equilibria and the Appearance of Nanoparticles in the Microstructure of Single-Crystal Ni-Base Superalloys

    Victoria Yardley, Ivan Povstugar, Pyuck-Pa Choi, Dirk Raabe, Alireza B. Parsa, Aleksander Kostka, Christoph Somsen, Antonin Dlouhy, Klaus Neuking, Easo P. George and Gunther Eggeler

    Version of Record online: 22 JUL 2016 | DOI: 10.1002/adem.201600237

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    Ni-base superalloy single crystals consist of the γ′ (cuboidal particles) and the γ phase (thin channels). Their volume fractions can be measured and calculated. In the present work, the authors use TEM and APT to document the presence of tiny spheroidal (20 nm) nanoparticles and use thermodynamics and kinetics to explain their appearance and their composition.

  2. Microstructures and Mechanical Properties of Commercial Hot-Extruded Copper Processed by Torsion Deformation

    Ning Guo, Xiaoxia Li, Mei Xiao, Renlong Xin, Linjiang Chai, Bo Song, Hongbing Yu and Lu Li

    Version of Record online: 22 JUL 2016 | DOI: 10.1002/adem.201600252

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    Free-end torsion deformation is used for processing copper rod in this work. Results show that the torsional rod has a gradient microhardness from core to surface due to a gradient distribution of lamellar dislocation substructures (LDS). With increasing torsion revolutions, the LDS density increases gradually, resulting in the improvement of subsequent tensile strength and hardening capability.

  3. The Impact of Size and Loading Direction on the Strength of Architected Lattice Materials

    Jens Bauer, Almut Schroer, Ruth Schwaiger and Oliver Kraft

    Version of Record online: 21 JUL 2016 | DOI: 10.1002/adem.201600235

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    The authors show that the strength of polymer–alumina core–shell composite microlattices doubles when their size is scaled down by 50%. Isotropic strength under tension and compression is achieved when observed thickness-dependent notch effects in the alumina shells are accounted for.

  4. Improving Formability of Mg–Ca–Zr Sheet Alloy by Microalloying of Zn

    Ming Zhe Bian, Zhuo Ran Zeng, Shi Wei Xu, Su Ming Zhu, Yu Man Zhu, Christopher Huw John Davies, Nick Birbilis and Jian Feng Nie

    Version of Record online: 21 JUL 2016 | DOI: 10.1002/adem.201600293

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    The addition of a small amount of zinc to a Mg–Ca–Zr alloy significantly improves formability and ductility, which makes the resultant alloy become a suitable composition for fabricating sheet. Furthermore, the resultant Zn-containing alloy has age hardening response, and its strength can be higher than that of commercial AZ31 alloy after post-forming ageing treatment.

  5. Directionally Aligned Ultra-Long Boron Nitride Nanotube Induced Strengthening of Aluminum-Based Sandwich Composite

    Pranjal Nautiyal, Chris Rudolf, Archana Loganathan, Cheng Zhang, Benjamin Boesl and Arvind Agarwal

    Version of Record online: 20 JUL 2016 | DOI: 10.1002/adem.201600212

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    A novel ultra-long Boron Nitride Nanotube (BNNT) reinforced Al-sandwich composite is engineered by a unique processing methodology, involving Al sputtering, spark plasma sintering, and cold rolling. The fabricated composite displays extraordinary, 400%, improvement in strength (200 MPa) compared to pure Al (≈40 MPa), due to crack bridging by directionally aligned long nanotubes and a strong matrix/nanotube interface.