Advanced Engineering Materials

Cover image for Vol. 11 Issue 3

March 2009

Volume 11, Issue 3

Pages 123–210, B1–B24

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Back Cover
    4. Contents
    5. Research News
    6. Review
    7. Communications
    8. Inside Front Cover
    9. Advanced Biomaterials
    10. Communication
    1. Numerical Determination of Heat Distribution and Castability Simulations of as Cast Mg—Al Alloys (Adv. Eng. Mater. 3/2009)

      Shehzad Saleem Khan, Norbert Hort, Janin Eiken, Ingo Steinbach and Siegfried Schmauder

      Version of Record online: 23 MAR 2009 | DOI: 10.1002/adem.200990005

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      The cover shows the simulated grains for Mg-10%Al, the dendritic, microstructure can be seen. More details can be found in the article of S.S. Khan on page 162.

  2. Back Cover

    1. Top of page
    2. Cover Picture
    3. Back Cover
    4. Contents
    5. Research News
    6. Review
    7. Communications
    8. Inside Front Cover
    9. Advanced Biomaterials
    10. Communication
    1. Back Cover: Fundamentals of Metal-induced Crystallization of Amorphous Semiconductors (Adv. Eng. Mater. 3/2009)

      Zumin Wang, Lars P. H. Jeurgens, Jiang Y. Wang and Eric J. Mittemeijer

      Version of Record online: 23 MAR 2009 | DOI: 10.1002/adem.200990006

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      The Backcover shows a covering layer of aluminum lowers the crystallization temperature of amorphous silicon (a-Si). First the a-Si covers (“wets”) the grain boundaries in the aluminum layer (Al). Once the wetting a-Si film has reached a critical thickness, crystallization starts at the grain boundaries. More details can be found in the article by E. J. Mittemeijer on page 131.

  3. Contents

    1. Top of page
    2. Cover Picture
    3. Back Cover
    4. Contents
    5. Research News
    6. Review
    7. Communications
    8. Inside Front Cover
    9. Advanced Biomaterials
    10. Communication
    1. Contents: (Adv. Eng. Mater. 3/2009) (pages 123–128)

      Version of Record online: 23 MAR 2009 | DOI: 10.1002/adem.200990007

  4. Research News

    1. Top of page
    2. Cover Picture
    3. Back Cover
    4. Contents
    5. Research News
    6. Review
    7. Communications
    8. Inside Front Cover
    9. Advanced Biomaterials
    10. Communication
    1. Fundamentals of Metal-induced Crystallization of Amorphous Semiconductors (pages 131–135)

      Zumin Wang, Lars P. H. Jeurgens, Jiang Y. Wang and Eric J. Mittemeijer

      Version of Record online: 11 FEB 2009 | DOI: 10.1002/adem.200800340

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      The recent development of a unified, fundamental model understanding of the metal-induced crystallization (MIC) of amorphous semiconductors is overviewed. Interface thermodynamics has been shown to play a decisive role for the whether or not occurrence of MIC.

  5. Review

    1. Top of page
    2. Cover Picture
    3. Back Cover
    4. Contents
    5. Research News
    6. Review
    7. Communications
    8. Inside Front Cover
    9. Advanced Biomaterials
    10. Communication
    1. Cracks and Plasticity (pages 137–142)

      Wolfgang Brocks

      Version of Record online: 25 FEB 2009 | DOI: 10.1002/adem.200800307

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      The paper reviews the state of the art of modeling deformation, damage and fracture of ductile metals on various length scales, namely numerical simulation of microvoid nucleation and growth, porosity based constitutive equations, the cohesive zone model and the macroscopic fracture-mechanics approach. The potential of a hierarchical modeling approach from the micro- to the macroscale is emphasized.

  6. Communications

    1. Top of page
    2. Cover Picture
    3. Back Cover
    4. Contents
    5. Research News
    6. Review
    7. Communications
    8. Inside Front Cover
    9. Advanced Biomaterials
    10. Communication
    1. On a Proper Account of First- and Second-Order Size Effects in Crystal Plasticity (pages 143–147)

      Marc G. D. Geers, Ron H. J. Peerlings, Johan P. M. Hoefnagels and Yuriy Kasyanyuk

      Version of Record online: 23 MAR 2009 | DOI: 10.1002/adem.200800287

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      This paper addresses engineering size effects in miniaturized metallic components. First, the critical role of processing induced size effects is emphasized. Next, the need for a rigorous strain gradient enrichment in crystal plasticity modelling is advocated, directly resulting from the coarse graining of discrete dislocation interactions. The physical origin of the energetic enrichment is discussed and its deterministic derivation is briefly confronted with analogous statistical mechanics results.

    2. Assessment of a Micro–Macro Modeling of the Bending and Unbending of Multiphase Steel Sheets (pages 148–152)

      Laurent Delannay, Anne-Pascale Pierman and Pascal J. Jacques

      Version of Record online: 20 FEB 2009 | DOI: 10.1002/adem.200800288

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      Dual phase steels and TRIP steels demonstrate complex mechanical responses whenever metal forming operations involve load reversals. The present study addresses this phenomenon using an experimental set-up which ensures pure bending and unbending of thin sheets. The proposed incremental mean-field theory produces valid predictions of the transient mechanical responses by accounting for the kinematical hardening of individual phases as well as the phase partitioning of plastic strain.

    3. A Micromechanical Study of the Deformation Behavior of TRIP-Assisted Multiphase Steels as a Function of the Microstructural Parameters of the Retained Austenite (pages 153–157)

      Denny Tjahjanto, Sergio Turteltaub, Akke Suiker and Sybrand van der Zwaag

      Version of Record online: 11 FEB 2009 | DOI: 10.1002/adem.200800306

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      The influence of austenitic volume fraction, carbon concentration, and grain size on the behavior of multiphase TRIP steels is investigated by means of micromechanical modeling and finite element simulations. The present analysis allows to directly attribute overall mechanical characteristics to the corresponding microstructural parameters, which is a difficult task to perform experimentally.

    4. Prediction of the Elastic Properties of Polycrystalline Microcomponents by Numerical Homogenization (pages 158–161)

      Katja Jöchen and Thomas Böhlke

      Version of Record online: 2 MAR 2009 | DOI: 10.1002/adem.200800308

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      Polycrystalline microcomponents made of Stabilor®G, a dental alloy mainly consisting of gold, are examined in terms of their elastic properties. Finite element calculations of uniaxial tensile tests are carried out with ABAQUS so as to identify the characteristic parameters of the distribution of Young's modulus. It is shown that the statistics of mechanical properties observed experimentally can be estimated by using the finite element method. The findings are generalized to microcomponents consisting of crystals with a cubic symmetry.

    5. Numerical Determination of Heat Distribution and Castability Simulations of as Cast Mg—Al Alloys (pages 162–168)

      Shehzad Saleem Khan, Norbert Hort, Janin Eiken, Ingo Steinbach and Siegfried Schmauder

      Version of Record online: 23 MAR 2009 | DOI: 10.1002/adem.200800269

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      Magnesium alloys offer a large potential as lightweight structures especially in the automotive industry. Research and development of magnesium alloys depend largely on the metallurgist's understanding and ability to control the microstructure of the as cast part. This research work comprises the determination of experimental parameters to simulate fluidity and microstructure of magnesium/aluminum binary alloys.

    6. Topological Analysis of Foams and Tetrahedral Structures (pages 169–176)

      Gad Frenkel, Raphael Blumenfeld, Peter R. King and Martin J. Blunt

      Version of Record online: 23 MAR 2009 | DOI: 10.1002/adem.200800090

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      A unified method is introduced to characterize the topology and connectivity of foams and general tetrahedral structures. A workflow for an automated characterization of the void space topology is presented, using a partition of the system volume into polyhedral cells connected by skeletal throats. The advantages of this characterization are discussed and it serves as the basic input for an entropic analysis of the statistics of structural configurational disorder.

    7. Dependence of Ductility on Free Volume in a Cu-Zr-Based Metallic Glass (pages 177–181)

      Feng Jiang, Yanglei Zhao, Lincai Zhang, Shibin Pan, Yinggang Zhou, Lin He and Jun Sun

      Version of Record online: 23 MAR 2009 | DOI: 10.1002/adem.200800262

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      Cu46Zr47Al7 bulk metallic glass alloy samples with different free volume states were obtained through thermal treatments such as annealing and quenching. Three-point bending tests were performed to these samples to evaluate their ductility. The results demonstrate that the ductility of BMGs is closely related to the free volume. The reduction in the free volume is the dominant reason for the embrittlement of samples annealed below Tg. In addition, the ductility of embrittled samples can be enhanced by restoring free volume by a short anneals above Tg followed by quenching.

    8. Hot Workability, Microstructural Control and Rate-Controlling Mechanisms in Cast-Homogenized AZ31 Magnesium Alloy (pages 182–188)

      Yellapregada Venkata Rama Krishna Prasad and Kamineni Pitcheswara Rao

      Version of Record online: 23 MAR 2009 | DOI: 10.1002/adem.200800204

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      Optimum conditions for microstructural control in industrial hot working of cast and homogenized AZ31 magnesium alloys are evaluated by using a processing map. The recommended window for bulk metal working of this alloy is the domain in the temperature range 300–450 °C and strain rate range 1–10 s−1, and the optimum processing parameters are 400 °C and 10 s−1, where grain-boundary self diffusion is the rate-controlling mechanism.

    9. Effects of Zirconium Additions on the Microstructure of As-Cast and Aged AZ91 Magnesium Alloy (pages 189–193)

      Farhoud Kabirian and Reza Mahmudi

      Version of Record online: 23 MAR 2009 | DOI: 10.1002/adem.200800223

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      The effects of Zr addition on the microstructure of AZ91 alloy were investigated under as-cast and isothermally aged conditions. The microstructures contained a eutectic β-Mg17Al12 phase together with fine Al–Zr intermetallic compounds. These intermetallic compounds inhibited grain growth during the 420 °C isothermal aging of Zr-containing alloys. Microstructural changes caused by Zr additions were most probably due to the consumption of Al by Zr, and redistribution of Al during solidification of dendrites.

    10. Enhanced Ductility of Dendrite-Ultrafine Eutectic Composite Fe3B Alloy Prepared by a Self-Propagating High-Temperature Synthesis (pages 194–197)

      Licai Fu, Jun Yang, Qinling Bi and Weimin Liu

      Version of Record online: 30 DEC 2008 | DOI: 10.1002/adem.200800178

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      The bulk dendrite-ultrafine eutectic composite Fe3B alloy was prepared by a self-propagating high-temperature synthesis. This technique is convenient, low cost, and capable of being scaled up for processing bulk nano/ultrafine-structured materials. The Fe3B alloy is composed of a micrometer-sized dendrite dispersed in an ultrafine laminar eutectic matrix and exhibits both high strength and large ductility in compressive tests.

    11. Direct Electrochemical Preparation of NbSi Alloys from Mixed Oxide Preform Precursors (pages 198–201)

      Fanke Meng and Huimin Lu

      Version of Record online: 23 MAR 2009 | DOI: 10.1002/adem.200800263

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      A new method of preparation of NbSi alloys has been provided in this article. Electro-deoxidizing mixed Nb2O5 and SiO2 small cylindrical pellets in molten CaF2 at high temperature (1500 °C) could produce homogenous NbSi alloys. And then, the cyclic voltammogram (CV) method was used to analyze the electroreduction mechanism. This effective method could shorten procedures of production of NbSi alloys and will be promising for industrial utilization.

    12. A Soft Molding Process for Fabrication of Micromachine Parts from Stainless Steel Powder (pages 202–205)

      Mohamed Imbaby, Kyle Jiang and Isaac Chang

      Version of Record online: 23 MAR 2009 | DOI: 10.1002/adem.200800165

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      This work introduces a valid approach to fabricate high quality micromachine parts from stainless steel powder using soft molding and powder metallurgy techniques. In soft molding, SU-8 and negative replicas micromolds are produced. A mixture of Duramax B-10007 and B-1000 is successfully used as a binder in the preparation of stainless steel slurry. Sintering in forming gas atmosphere is very effective of preventing the oxidation of the stainless.

    13. Microstructures and Mechanical Properties of Hot-Pressed ZrB2-Based Ceramics from Synthesized ZrB2 and ZrB2-ZrC Powders (pages 206–210)

      Wei-Ming Guo and Guo-Jun Zhang

      Version of Record online: 23 MAR 2009 | DOI: 10.1002/adem.200800238

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      The influence of ZrC on the microstructure and mechanical properties of ZrB2-SiC ceramics was investigated. SEM observation showed that the presence of ZrC greatly inhibited the grain growth of ZrB2 and SiC phases. With the introduction of ZrC, the Vickers' hardness, fracture toughness, and bending strength of the sintered ceramics increased significantly.

  7. Inside Front Cover

    1. Top of page
    2. Cover Picture
    3. Back Cover
    4. Contents
    5. Research News
    6. Review
    7. Communications
    8. Inside Front Cover
    9. Advanced Biomaterials
    10. Communication
    1. You have free access to this content
      Inside Front Cover —Advanced Biomaterials 1/2009

      Andrés F. Lasagni, Dajun Yuan, Peng Shao and Suman Das

      Version of Record online: 9 APR 2009 | DOI: 10.1002/adem.200990010

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      The cover picture by Lasagni et. al shows two-dimensional periodic microstructures of polyethylene glycol diacrylate (PEG-DA) fabricated using nanosecond (top) and femtosecond (bellow) multibeam laser interference patterning (MLI). The periodic topography can be varied by simple control of the interference patterns as well as exposure dosages. Such structures with controlled topography are of relevant importance for applications in biomedical devices.

  8. Advanced Biomaterials

    1. Top of page
    2. Cover Picture
    3. Back Cover
    4. Contents
    5. Research News
    6. Review
    7. Communications
    8. Inside Front Cover
    9. Advanced Biomaterials
    10. Communication
    1. Electrochemically Deposited Ca(OH)2 Coatings as a Bactericidal and Osteointegrative Modification of Ti Implants (pages B1–B6)

      Claus Moseke, Wolfgang Braun and Andrea Ewald

      Version of Record online: 23 MAR 2009 | DOI: 10.1002/adem.200800154

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      Coating of metallic implants with CaP is a common method of improving osseointegration of the device. In this study Ca(OH)2 coatings are analyzed combining the advantage of initial bacteriocidity with–after conversion of the hydroxide to hydroxyapatite in physiological media–good osteoconductivity.

    2. A Novel Biodegradable and Light-Breakable Diblock Copolymer Micelle for Drug Delivery (pages B7–B11)

      Zhigang Xie, Xiuli Hu, Xuesi Chen, Guojun Mo, Jing Sun and Xiabin Jing

      Version of Record online: 23 MAR 2009 | DOI: 10.1002/adem.200800254

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      A facile approach to the preparation of light-responsive copolymer micelles is developed. This approach is based on the attachment of hydrophobic groups to one block of a diblock copolymer via a light-sensitive linkage. The micelles can be dissociated under light irradiation and release the encapsulated pyrene. The obtained polymeric micelles are expected to be of use as drug-delivery vehicles.

    3. Temperature-Sensitive Simultaneous Interpenetrating Polymeric Networks With Improved Mechanical Properties and Shrinking Kinetics (pages B12–B19)

      Jian-Tao Zhang, Mahendra Thunga, Silvia Petersen, Rahila Bhat, Xiangli Liu, Roland Weidisch, Alfred Fahr and Klaus D. Jandt

      Version of Record online: 23 MAR 2009 | DOI: 10.1002/adem.200800266

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      In this study, a new IPN structure was designed and a simultaneous method was for the first time utilized to prepare temperature sensitive PNIPAAm IPN hydrogels by carrying out the radical polymerization and hydrolysis/condensation for two kinds of reaction at the same time. Due to the specific structures, the newly prepared simultaneous IPN gels displayed higher elastic modulus and faster shrinking rates than the conventional PNIPAAm gel.

  9. Communication

    1. Top of page
    2. Cover Picture
    3. Back Cover
    4. Contents
    5. Research News
    6. Review
    7. Communications
    8. Inside Front Cover
    9. Advanced Biomaterials
    10. Communication
    1. Periodic Micropatterning of Polyethylene Glycol Diacrylate Hydrogel by Laser Interference Lithography Using Nano- and Femtosecond Pulsed Lasers (pages B20–B24)

      Andrés F. Lasagni, Dajun Yuan, Peng Shao and Suman Das

      Version of Record online: 20 FEB 2009 | DOI: 10.1002/adem.200800295

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      In this article, we report on the fabrication of periodic arrays using multibeam laser interference patterning (MLI) with both nanosecond and femtosecond lasers on hydrogel materials. Configurations involving two, four, and five laser beams were utilized being able to produce a wide range of periodic arrays.

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