Advanced Engineering Materials

Cover image for Vol. 14 Issue 10

October 2012

Volume 14, Issue 10

Pages 835–927

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Masthead
    4. Contents
    5. Editorial
    6. Communications
    7. Review
    8. Communications
    1. Front Cover Advanced Engineering Materials 10/2012

      Olga Semenova and Regina Krachler

      Article first published online: 5 OCT 2012 | DOI: 10.1002/adem.201290035

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      The cover shows the structure of B2-compounds. It is created by the authors and dedicated to the 65 anniversary of Prof. Herbert Ipser. Further details can be found in the article by Semenova et. al. on page 881.

  2. Masthead

    1. Top of page
    2. Cover Picture
    3. Masthead
    4. Contents
    5. Editorial
    6. Communications
    7. Review
    8. Communications
    1. Adv. Eng. Mater. 10/2012

      Article first published online: 5 OCT 2012 | DOI: 10.1002/adem.201290036

  3. Contents

    1. Top of page
    2. Cover Picture
    3. Masthead
    4. Contents
    5. Editorial
    6. Communications
    7. Review
    8. Communications
    1. Adv. Eng. Mater. 10/2012 (pages 835–839)

      Article first published online: 5 OCT 2012 | DOI: 10.1002/adem.201290034

  4. Editorial

    1. Top of page
    2. Cover Picture
    3. Masthead
    4. Contents
    5. Editorial
    6. Communications
    7. Review
    8. Communications
  5. Communications

    1. Top of page
    2. Cover Picture
    3. Masthead
    4. Contents
    5. Editorial
    6. Communications
    7. Review
    8. Communications
    1. Influence of the ECAP Processing Parameters on the Cyclic Deformation Behavior on Ultrafine-Grained Cubic Face Centered Metals (pages 842–847)

      Andreas Böhner, Heinz Werner Höppel, Johannes May and Mathias Göken

      Article first published online: 5 JAN 2012 | DOI: 10.1002/adem.201100217

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      Ultrafine-grained materials exhibit improved mechanical properties under cyclic loading compared to their coarse-grained counterparts. These improvements are strongly dependent on the processing parameters. In this work the influences of the processing route, number of passes, and alloying content are shown.

    2. Prediction of Fatigue Lives of MAR-M247 LC Based on the Crack Closure Concept (pages 848–852)

      Domnin Gelmedin, Karl-Heinz Lang and James C. Newman Jr.

      Article first published online: 9 JAN 2012 | DOI: 10.1002/adem.201100194

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      Under combined low and high cycle fatigue loading, block striations form on the fracture surfaces of MAR-M247 LC at 650 °C which can be referred to the LCF loading cycle. The HCF crack growth behavior is derived by using the linear summation model. Crack growth lives starting from equivalent initial flaw sizes are calculated by the crack closure code FASTRAN and compared with experimental fatigue lives.

    3. Influence of γ-α′-Phase Transformation in Metastable Austenitic Steels on the Mechanical Behavior During Tensile and Fatigue Loading at Ambient and Lower Temperatures (pages 853–858)

      Frank Hahnenberger, Marek Smaga and Dietmar Eifler

      Article first published online: 16 MAY 2012 | DOI: 10.1002/adem.201100341

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      The metastable austenitic steels AISI 304, 321 and 348 are examined in the temperature range −60 °C ≤ T ≤ AT. The α′-martensite formation corresponds to the estimated austenite stability. Tensile and fatigue experiments reveal that its influence on the mechanical behavior is strongest for steel AISI 304, which is underlined by an analysis of cyclic deformation curves and a microhardness evaluation.

    4. Physically Based Fatigue Assessment of the Nodular Cast Iron ASTM 80-55-06 (EN-GJS-600) at Different Testing Frequencies (pages 859–866)

      Holger Germann, Peter Starke and Dietmar Eifler

      Article first published online: 23 MAY 2012 | DOI: 10.1002/adem.201100339

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      For the fatigue assessment of the nodular cast iron ASTM 80-55-06 stress-controlled fatigue tests were performed at different testing frequencies. Mechanical, temperature, electrical resistance and frequency measurements during cyclic loading provide the possibility to get detailed information about fatigue processes. Based on the measured data from only three fatigue tests SN curves can be calculated with the fatigue life calculation method “PHYBALLIT”.

    5. Effects of Fiber Orientation and Moisture on the Crack Growth in Short Glass Fiber Reinforced Polyamide (pages 867–872)

      Stephan Günzel, Stefan Hickmann, Christian Wittemeyer and Volker Trappe

      Article first published online: 20 JUN 2012 | DOI: 10.1002/adem.201100337

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      The crack propagation is measured in short glass fiber reinforced polyamides with respect to the fiber orientation and moisture content. In the figure is shown the rough fracture surface of a CT-specimen with main fiber orientation perpendicular to the crack propagation. An empirical model is given to describe the behaviour of crack growth for different global fiber orientations and different contents of moisture.

    6. Monotonic and Cyclic Deformation Behavior of MIG-CMT Welded and Heat-Treated Joints of Aluminum Cast and Wrought Alloys (pages 873–880)

      Matthias Kantehm, Marcus Söker, Ulrich Krupp and Wilhelm Michels

      Article first published online: 20 JUL 2012 | DOI: 10.1002/adem.201100338

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      The monotonic and cyclic deformation behavior of welded heat-treated hybrid butt welds of aluminum sand-cast EN AC-Al Si7Mg0.3 and wrought EN AW-Al Si1MgMn (EN AW-6082) are characterized. A combination of optimized heat treatment and the cold-metal-transfer (CMT) MIG welding process allows the elimination of weld and the heat-affected zone (HAZ) as weakest links. Tensile and bending fatigue tests revealed mechanical properties that are better than those of the sand-cast substrate materials.

  6. Review

    1. Top of page
    2. Cover Picture
    3. Masthead
    4. Contents
    5. Editorial
    6. Communications
    7. Review
    8. Communications
    1. A Statistical-Thermodynamic Modeling of Ordering Phenomena in Binary Intermetallic B2- and L12-Structures (pages 881–891)

      Olga Semenova and Regina Krachler

      Article first published online: 7 SEP 2012 | DOI: 10.1002/adem.201200172

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      A correct statistical-thermodynamic modeling for description of ordering in nonstoichiometric intermetallic B2-, and L12-phases can be very helpful for design of new functional materials. The basic concept of presented review includes the evaluation of such characteristics of the intermetallic materials as the virtual critical temperatures of order-disorder transformations, pair-wise interaction and defect formation energies, thermodynamic activities and defect concentrations, and also descriptions of long-ranged and short-ranged atomic correlations in the crystal lattice. Written in dedication of the 65 anniversary of Prof. Herbert Ipser.

  7. Communications

    1. Top of page
    2. Cover Picture
    3. Masthead
    4. Contents
    5. Editorial
    6. Communications
    7. Review
    8. Communications
    1. On the Estimation of True Hall–Petch Constants and Their Role on the Superposition Law Exponent in Al Alloys (pages 892–897)

      Shanmugasundaram Thangaraju, Martin Heilmaier, Budaraju Srinivasa Murty and Subramanya Sarma Vadlamani

      Article first published online: 21 AUG 2012 | DOI: 10.1002/adem.201200114

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      Hall–Petch (HP) relation and the superposition of different strengthening mechanisms in aluminum alloys with grain sizes in the range of 50 nm–70 µm were analyzed. Considering only grain size strengthening (by subtracting other strengthening contributions), HP constants of σ0 ≈ 10 MPa and kHP ≈ 0.06 MPa m1/2 comparable to those obtained in pure Al were obtained over wide range of grain sizes for the case of linear superposition of the different strengthening mechanisms.

    2. Dependence of GFA and Crystallization Behaviors of Al86Ni9La5 Metallic Glass on Its Original Liquid State (pages 898–901)

      Zhi-Zhi Wang, Fang-Qiu Zu, Zhang Zhang, Xiao Cui, Li-Fang Wang and Guo-Dong Sun

      Article first published online: 7 AUG 2012 | DOI: 10.1002/adem.201200071

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      The temperature-induced liquid–liquid structure transtion (LLST) of Al86Ni9La5 melt was identified by means of electrical resistivity and differential thermal analysis measurement. The effects of LLST on the GFA and crystallization processes are studied. When the amorphous sample is prepared under the temperature experienced LLST, the GFA will be reduced. The LLST also has a significant influence on the intermetallic compounds formation during the crystallization process.

    3. Plastic Deformation of a Nano-Precipitate Strengthened Ni-Base Alloy Investigated by Complementary In Situ Neutron Diffraction Measurements and Molecular-Dynamics Simulations (pages 902–908)

      E-Wen Huang, Gabor Csiszár, Yu-Chieh Lo, Yu-Lih Huang, Wen-Jay Lee, Tamás Ungár and Peter K. Liaw

      Article first published online: 30 JUL 2012 | DOI: 10.1002/adem.201200057

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      In situ neutron-diffraction experiments, simultaneously illuminating the plastic deformation of the matrix and the strengthening nano precipitates, respectively. An irreversible neutron-diffraction-profile evolution of the nano precipitates is observed. The molecular-dynamics simulations are applied to reveal the deformation mechanisms of the nano precipitate and its interaction with the surrounding matrix comparing to the neutron diffraction results. The microstructural parameters quantified by TEM and small-angle neutron scattering are used as the simulation input.

    4. Syntactic Iron Foams – On Deformation Mechanisms and Strain-Rate Dependence of Compressive Properties (pages 909–918)

      Lorenzo Peroni, Martina Scapin, Massimiliano Avalle, Jörg Weise, Dirk Lehmhus, Joachim Baumeister and Matthias Busse

      Article first published online: 21 AUG 2012 | DOI: 10.1002/adem.201200160

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      Syntactic iron foams have been produced by metal injection moulding techniques from iron powders and commercially available glass microspheres at varied content levels. Quasi-static and high strain-rate dynamic properties are determined and interpreted, showing that the respective materials reveal high strength as well as several points of attack that will allow tailoring their characteristics to meet specific application requirements. The image shows the structure of a material containing 10 wt% of microspheres, etched to visualize grain boundaries.

    5. Microstructure and Magnetic Properties of FeNiCuMnTiSnx High Entropy Alloys (pages 919–922)

      Liang Liu, Jian Bo Zhu, Jian Chen Li and Qing Jiang

      Article first published online: 21 AUG 2012 | DOI: 10.1002/adem.201200104

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      FeNiCuMnTiSnx multicomponent alloys are prepared and the properties are investigated. With the increasing of Sn content, the crystal structure of alloys transforms from mixed intermetallic compounds to a single crystal structure and the magnetization of alloys gradually increases from 0.34 to 15.8 emu · g−1. The magnetic transformation undergoes from the paramagnetism to superparamagnetism finally to soft magnetism. We find that the magnetism of alloys appears when Fe atoms replace Ni atoms.

    6. Investigation of In Situ and Conventional Post-Weld Heat Treatments on Dual-Laser-Beam-Welded γ-TiAl-Based Alloy (pages 923–927)

      Jie Liu, Volker Ventzke, Peter Staron, Norbert Schell, Nikolai Kashaev and Norbert Huber

      Article first published online: 17 SEP 2012 | DOI: 10.1002/adem.201200113

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      In order to improve the microstructure and mechanical properties of Ti–45Al–5Nb–0.2C–0.2B joints, in situ, and conventional post-weld heat treatments are applied during laser beam welding. The seams are crack-free with convoluted microstructure, reduced longitudinal residual stress and higher elongation to fraction after post-weld heat treatment. The phase composition across the welding zone is also discussed.

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