Advanced Engineering Materials

Cover image for Vol. 16 Issue 4

April 2014

Volume 16, Issue 4

Pages 341–465

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Back Cover
    4. Masthead
    5. Contents
    6. Review
    7. Communications
    8. Full Papers
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      Front Cover: Advanced Engineering Materials 4∕2014 (page 341)

      Article first published online: 31 MAR 2014 | DOI: 10.1002/adem.201470012

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      Micro-tensile samples were utilized as shown in the figure extracted from a friction stir welded (FSW) plate of Ti-5111 and mechanically tested to failure in order to measure local material properties. The experimentally determined mechanical properties are linked down to the micro-structural regions that develop during the FSW process as described by Marc Zupan and co-workers on page 452.

  2. Back Cover

    1. Top of page
    2. Cover Picture
    3. Back Cover
    4. Masthead
    5. Contents
    6. Review
    7. Communications
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      Back Cover: Advanced Engineering Materials 4∕2014

      Article first published online: 31 MAR 2014 | DOI: 10.1002/adem.201470015

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      The cover graphic shows the scheme of the possible growth mechanism of two kinds of ZnSe-based longitudinal twinning nanowires grown by a simple thermal evaporation method. More details can be found in the article by Chunrui Wang and co-workers on page 459.

  3. Masthead

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      Adv. Eng. Mater. 4∕2014 (page 342)

      Article first published online: 31 MAR 2014 | DOI: 10.1002/adem.201470013

  4. Contents

    1. Top of page
    2. Cover Picture
    3. Back Cover
    4. Masthead
    5. Contents
    6. Review
    7. Communications
    8. Full Papers
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      Adv. Eng. Mater. 4∕2014 (pages 343–348)

      Article first published online: 31 MAR 2014 | DOI: 10.1002/adem.201470014

  5. Review

    1. Top of page
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    4. Masthead
    5. Contents
    6. Review
    7. Communications
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    1. Lead–Bismuth Eutectic (LBE): A Coolant Candidate for Gen. IV Advanced Nuclear Reactor Concepts (pages 349–356)

      Jinsuo Zhang

      Article first published online: 18 DEC 2013 | DOI: 10.1002/adem.201300296

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      The majority of the data points collected collapse onto one universal curve. While there are still scatters, the general trend growth becomes clear that the Tedmon's equation can represent the oxide layer growth kinetics in liquid lead–bismuth with oxygen controlled.

  6. Communications

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    5. Contents
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    1. 3D Auxetic Microlattices with Independently Controllable Acoustic Band Gaps and Quasi-Static Elastic Moduli (pages 357–363)

      Sebastian Krödel, Tommaso Delpero, Andrea Bergamini, Paolo Ermanni and Dennis M. Kochmann

      Article first published online: 23 OCT 2013 | DOI: 10.1002/adem.201300264

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      Mechanical metamaterials offer unique possibilities to tune their mechanical response by adjusting their geometry, without the complexity that the thermodynamics and kinetics of materials synthesis otherwise impose. In this work, the tuning of the quasi-static and wave propagation properties of micro-lattice structures are explored using numerical methods. The ability to independently modify the elastic moduli and the dispersion properties of the material by appropriately placing micro-inertia elements is demonstrated. The numerical methods used for this investigation are also presented.

    2. Corrosion Performance of Biodegradable Mg–6%Nd–2%Y–0.5%Zr Produced by Melt Spinning Technology** (pages 364–370)

      Orly Hakimi and Eli Aghion

      Article first published online: 23 OCT 2013 | DOI: 10.1002/adem.201300201

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      Corrosion performance of biodegradable EW62 alloy obtained by melt spinning is evaluated in a simulated physiological electrolyte. The improved corrosion resistance of this alloy is attributed to the formation of a refined microstructure and oxide film both enriched with abnormal content of Nd. The beneficial effect of rapid solidification on the distribution of impurities has minimized their microgalvanic effect, hence contributes the corrosion resistance.

    3. Deformation Behavior and Microstructural Evolution of Ultrafine-Grained Commercially Pure Ti (pages 371–375)

      Xiaoyan Liu, Xicheng Zhao, Xirong Yang and Chen Xie

      Article first published online: 17 OCT 2013 | DOI: 10.1002/adem.201300239

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      Compression deformation tests are conducted on ultrafine-grained (UFG) commercially pure (CP) Ti. The deformation behavior is investigated by the true stress–true strain curves and deformed microstructures. The flow stress of UFG CP Ti exhibits a steady flow state, which significantly depends on the strain rate and deformation temperature. The continuous dynamic recrystallization can be considered as the predominant softening mechanism of UFG CP Ti during the compression deformation.

    4. Effect of Solution Treatment Time on Structure and Mechanical Properties of Fast-Cooled Ti–7.5Mo Alloy (pages 376–380)

      Chin-Chin Chung, Jing-Wei Lee, Chien-Ping Ju and Jiin-Huey Chern Lin

      Article first published online: 20 MAR 2014 | DOI: 10.1002/adem.201300281

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      Structure and properties of Ti–7.5Mo alloy are found sensitive to the solution treatment of the alloy. The alloy solution-treated for 1 min is comprised of equi-axed, retained β phase mixed with fine, acicular-shaped α′ phase, while the alloy treated for longer times primarily has an orthorhombic, fine acicular α″ phase. Among all samples, the alloy treated for 1 min has the highest YS, UTS, and modulus values with the lowest elongation.

  7. Full Papers

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    4. Masthead
    5. Contents
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    1. Superplasticity at Elevated Temperature of a Coarse-Grained Mg–Li Alloy (pages 381–388)

      Kai Lin, Zhixin Kang, Qiang Fang and Junyi Zhang

      Article first published online: 9 OCT 2013 | DOI: 10.1002/adem.201300302

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      Tensile tests on a coarse-grained Mg–Li alloy are conducted at 523 K with strain rates of 5 × 10−4–1 × 10−2 s−1. It is obvious that the flow stresses take longer time to reach peak value and show a platform for a period of time with strain rates from 1 × 10−3 to 5 × 10−4 s−1, indicating dynamic recrystallization softening and work hardening reach equilibrium. A maximum elongation of 512% is achieved at 523 K with 5 × 10−4 s−1.

    2. Crack Mitigation during Dealloying of Au25Cu75 (pages 389–398)

      Yi Zhong, Jürgen Markmann, Hai-Jun Jin, Yulia Ivanisenko, Lilia Kurmanaeva and Jörg Weissmüller

      Article first published online: 25 OCT 2013 | DOI: 10.1002/adem.201300211

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      Electrochemical dealloying of Au25Cu75 leads to uniform and specifically crack-free monolithic bodies with a structure size in the range of 10 nm or even below. The key issues to achieve that goal are the investigation of the role of the lattice parameter change, the dealloying potential and rate, and the thermo-mechanical treatment of the master alloys.

    3. Effect of Grain Refiners and Casting Thickness on the Microstructure Development and Mechanical Properties of DSC-Cast AZ31B Magnesium Strips** (pages 399–405)

      Heinz Palkowski and Mithat Akdesir

      Article first published online: 14 NOV 2013 | DOI: 10.1002/adem.201300092

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      The study focuses on the effect of grain refining by C, SiC, AlSr10, and AlTi5B1 as well as the cast thickness of the strips on the microstructure and mechanical properties of an AZ31B alloy casted in a DSC process. The addition of grain refiners and the reduction of the cast strip thickness results in a significant reduction of the grain size and an improvement of the mechanical properties.

    4. Equiaxed and Porous Thermal Barrier Coatings Deposited by Atmospheric Plasma Spray Using a Nanoparticles Powder (pages 406–412)

      Yang Gao, Jianyi Gao and Deming Yang

      Article first published online: 13 DEC 2013 | DOI: 10.1002/adem.201300284

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      In this study, a novel coating with microstructure comprised equiaxed grains and multitudinous pores applied to thermal barrier coatings (TBCs) is fabricated by atmospheric plasma spray (APS) using nano-particles of partially stabilized zirconia. This coating is different from either conventional lamellar structure TBCs deposited by APS or columnar structure TBCs deposited by EB-PVD, which exhibits a good strain tolerance.

    5. Dislocation Evolution in Nanograins during Successive Stress Relaxation (pages 413–420)

      Guoyong Wang and Jianshe Lian

      Article first published online: 16 DEC 2013 | DOI: 10.1002/adem.201300300

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      The mobile dislocation density of a nanocryatalline copper during plastic strain is deduced from the successive stress relaxation experiment. And it is compared with a coarse-grained copper. The high mobility of the dislocation in nanocrystalline copper indicate that the dislocation seldom interact with each other and generate sessile barrier, and render the nanocrystalline copper a more diminutive strain-hardening capacity than coarse-grained copper.

    6. Analysis of the Size Effect on Springback Behavior in Micro-Scaled U-Bending Process of Sheet Metals (pages 421–432)

      Jilai Wang, Mingwang Fu and Jiaqi Ran

      Article first published online: 13 DEC 2013 | DOI: 10.1002/adem.201300275

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      In the micro-bending process of sheet metals, springback caused by elastic recovery during unloading has a significant effect on the dimension precision. To explore the springback of sheet metals after micro-bending, the experimental studies on the interactive influence of a few significant parameters were conducted. An appropriate constitutive model based on the surface layer model is proposed to predict springback and the relationship among these parameters is further established.

    7. Influence of the Type of Phase Change Materials Microcapsules on the Properties of Lime-Gypsum Thermal Mortars (pages 433–441)

      Sandra Cunha, José B. Aguiar, Victor M. Ferreira and A. Tadeu

      Article first published online: 20 NOV 2013 | DOI: 10.1002/adem.201300278

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      This paper presents the influence of the incorporation of two different PCMs in mortars. The figure shows the morphology of one type of PCM microcapsules. It was possible to conclude that the incorporation of PCM in mortars caused differences in properties such as compressive strength, flexural strength, and shrinkage. The incorporation of PCM microcapsules resulted in an increased shrinkage and in improved mechanical properties.

    8. Selective Dissolution of Retained Austenite in Nanostructured Bainitic Steels (pages 442–444)

      Oluwole Kazum, Mathan Bobby Kannan, Hossein Beladi, Ilana Timokhina, Peter Hodgson and Shahin Khoddam

      Article first published online: 20 NOV 2013 | DOI: 10.1002/adem.201300287

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      Nanostructured bainitic steels, containing bainitic ferrite laths and retained austenite films, formed at two different isothermal temperatures (i.e. 200 and 350 °C) are compared for the corrosion behavior in chloride-containing solution. Selective dissolution of the retained austenite phase is observed for both the steels, but the corrosion attack is higher in the 350 °C steel due to the difference in the volume fraction of retained austenite.

    9. Microstructure and Texture Evolution in an Intermetallic β-Stabilized TiAl Alloy During Forging and Subsequent Isothermal Annealing (pages 445–451)

      Andrea Gaitzenauer, Andreas Stark, Daniel Gosslar, Helmut Clemens and Svea Mayer

      Article first published online: 4 DEC 2013 | DOI: 10.1002/adem.201300265

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      Microstructure and texture evolution was studied in an intermetallic Ti–43.4Al–4.2Nb–1.1Mo–0.1B alloy during a novel near conventional hot-die forging process on an industrial scale. Subsequent isothermal annealing treatments lead to a significant change of the volume fractions of the constituting phases as well as to a structural homogenization.

    10. Location and Orientation Specific Material Property Evaluation of Friction Stir Welded Ti-5111: A Microsample Approach (pages 452–458)

      Salahudin Nimer, Jennifer Wolk and Marc Zupan

      Article first published online: 27 DEC 2013 | DOI: 10.1002/adem.201300427

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      Microsamples (shown in figure) are extracted from a friction stir welded plate of Ti-5111 and mechanically tested to failure. Samples are oriented in the longitudinal to the weld direction and compared to previous work that characterized the weld in the transverse direction.

    11. ZnSe-Based Longitudinal Twinning Nanowires (pages 459–465)

      Jing Xu, Aijiang Lu, Chunrui Wang, Rujia Zou, Xiaoyun Liu, Xing Wu, Yuxi Wang, Sijia Li, Litao Sun, Xiaoshuang Chen, Hongseok Oh, Hyeonjun Baek, Gyu-Chul Yi and Junhao Chu

      Article first published online: 20 JAN 2014 | DOI: 10.1002/adem.201300405

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      Two kinds of ZnSe-based longitudinal twinning nanowires are grown through a simple thermal evaporation. The growth of them might be caused by the crystal plane slip during the phase transformation process between the wurtzite and the zinc blende ZnSe nanowire.

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