Advanced Engineering Materials

Cover image for Vol. 18 Issue 4

Early View (Online Version of Record published before inclusion in an issue)

  1. Full Papers

    1. Effect of Zr Content on the Morphology and Emissivity of Surface Oxide Scales on FeCrAlY Alloys

      Pawel Huczkowski, Sayee Ganesh Gopalakrishnan, Wojciech Nowak, Heike Hattendorf, Riza Iskandar, Joachim Mayer and Willem Joseph Quadakkers

      Article first published online: 3 DEC 2015 | DOI: 10.1002/adem.201500439

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      The investigation aims at obtaining a life time extension of FeCrAlY heating elements by increasing the emissivity of the alumina surface scales. It is shown that an optimized high Zr content might be a suitable concept for obtaining a high emissivity in thin foil heating elements.

    2. Modeling, Design, and Development of Soft Pneumatic Actuators with Finite Element Method

      Philip Moseley, Juan Manuel Florez, Harshal Arun Sonar, Gunjan Agarwal, William Curtin and Jamie Paik

      Article first published online: 3 DEC 2015 | DOI: 10.1002/adem.201500503

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      Soft pneumatic actuators (SPAs) are compliant, elastomer-based actuators that enable safer human–robot interaction. This work presents an open-source simulation and design tool for SPAs using finite element method, compatible and extensible to different soft materials and design parameters.

    3. Evaluation of Magnesium Die-Casting Alloys for Elevated Temperature Applications: Castability

      Mark A. Easton, Suming Zhu, Trevor B. Abbott, Matthew Dargusch, Morris Murray, Gary Savage, Norbert Hort and Mark A. Gibson

      Article first published online: 24 NOV 2015 | DOI: 10.1002/adem.201500407

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      The castability of eight “creep resistant” magnesium alloys, together with other five conventional Mg alloys, is assessed in a castability die considering cracking, filling, and spangling. Among all “creep resistant” alloys, AE44, AS31, MRI153A, and HP2plus are found to have very good castability, although they are still inferior to conventional Mg alloys, AZ91 and ZA124 (see figure).

    4. An Assessment of the Role of Fiber Coating and Suspending Fluid on the Deposition of Carbon Nanotubes onto Glass Fibers for Multiscale Composites

      J. J. Ku-Herrera, A. May-Pat and F. Avilés

      Article first published online: 19 NOV 2015 | DOI: 10.1002/adem.201500389

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      Increased glass fiber electrical conductivity and improved interfacial shear strength between the CNT-modified fibers and a vinyl ester resin is achieved upon CNT deposition, especially when the fiber coating is maintained and an adequate silane coupling agent is used.

    5. Glass-Forming Ability and Crystallization Behavior of Al86Ni9La5 Metallic Glass with Si Addition

      Jiaojiao Yi, Wanqiang Xu, Xianzhong Xiong, Lingti Kong, Micheal Ferry and Jinfu Li

      Article first published online: 17 NOV 2015 | DOI: 10.1002/adem.201500354

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      The glass-forming ability (GFA) increases first and then decreases with the increase of Si addition, as shown in the figure. The change in GFA with the Si addition is interpreted on the basis of atomic packing and chemical interaction in combination with the crystallization kinetics analysis.

  2. Reviews

    1. A Review of Different Creep Mechanisms in Mg Alloys Based on Stress Exponent and Activation Energy

      Karuna Ratnakaran Athul, Uma Thanu Subramonia Pillai, Amirthalingam Srinivasan and Bellambettu Chandrasekhara Pai

      Article first published online: 17 NOV 2015 | DOI: 10.1002/adem.201500393

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      Concentrated effort has been expanded during the past few decades for developing and optimizing magnesium alloys with enhanced creep resistance. This article summarizes the various creep deformation mechanisms prevailing in magnesium alloys based on the stress exponent (n) and activation energy (Q), for different temperatures and stresses.

  3. Full Papers

    1. Thermal Conductivity of Polymer Composites With Geometric Characteristics of Carbon Allotropes

      Ye Ji Noh, Hyun Su Kim, Bon-Cheol Ku, Myung-Seob Khil and Seong Yun Kim

      Article first published online: 17 NOV 2015 | DOI: 10.1002/adem.201500451

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      Effect of the sizes and shapes of the diverse carbon allotropes such as carbon black, carbon nanotube, graphene nanoplatelet, graphite, pitch-based carbon fiber (PCF), and expanded graphite (EG) on the thermal conductivity of polymer composites is investigated. Microsized one-dimensional PCF and EG including the intercalation spacing induced effective improvement of the thermal conductivity.

    2. Coupling Diffraction Contrast Tomography with the Finite Element Method

      Henry Proudhon, Jia Li, Peter Reischig, Nicolas Guéninchault, Samuel Forest and Wolfgang Ludwig

      Article first published online: 16 NOV 2015 | DOI: 10.1002/adem.201500414

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      This paper explains how to turn 3D experimental grain maps into suitable mesh for mechanical analysis. Two examples from diffraction contrast tomography experiments are featured. i) A pure titanium sample of 600 microns diameter composed of 1 400 grains; ii) a significantly large zone of a polycrystalline Al–Li sample is meshed and deformed using crystal plasticity with a finite strain formulation.

    3. Polymer Foams Made of Immiscible Polymer Blends Compatibilized by Janus Particles—Effect of Compatibilization on Foam Morphology

      Stefanie Bärwinkel, Ronak Bahrami, Tina I. Löbling, Holger Schmalz, Axel H. E. Müller and Volker Altstädt

      Article first published online: 10 NOV 2015 | DOI: 10.1002/adem.201500387

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      Highly active Janus particles result in much finer morphologies in the compact blend materials after compatibilization. Their effect on the foam morphologies is even more significant due to the larger surface area available for nucleation, which result in a very fine cellular structure. Strong JP bonds at the interface also result in partially open cell structures in the foam.

    4. Influence of Pre-Solution Treatment on Microstructure and Mechanical Properties of Mg–Gd–Nd–Zn–Zr Alloy Processed by ECAP

      Yong Liu, Zhi Xin Kang, Jun Yi Zhang, Fen Wang and Yuan Yuan Li

      Article first published online: 9 NOV 2015 | DOI: 10.1002/adem.201500471

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      As-cast and solution-treated Mg–Gd–Nd–Zn–Zr alloys are ECAPed at 375 °C with a speed of 0.4 mm s−1 for one, four, and eight passes, respectively. The as-cast alloy ECAPed for eight passes possesses higher strength and lower tensile elongation than that in case of pre-solution-treated alloy. However, the pre-solution-treated alloy exhibits a large tensile elongation. The change in texture contributes to the increase of ductility and work hardening.

    5. Wave Band Adjustable Infrared Filtering via Mott Transition of Nano Ti2O3

      Weiwei Yan, Lide Zhang, Junxi Zhang and Guangtao Fei

      Article first published online: 9 NOV 2015 | DOI: 10.1002/adem.201500395

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      Infrared transmittance descends and filtering band covers from short to long wavelength end with temperature rising, based on the trumpet-like transmittance curves at different temperatures. Grain size distribution controls semiconductor–metal transition in nano Ti2O3 and determines filtering range essentially. The combination of different distributions realizes the broad and adjustable wave band infrared filtering. There might be more applicable materials.

    6. Densified Kinetics and Properties of Carbon Matrix Composites Reinforced with Carbon Nanotubes Prepared by Dielectrophoresis

      Jin Song Li, Jia Ming Guan and Rui Ying Luo

      Article first published online: 4 NOV 2015 | DOI: 10.1002/adem.201500438

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      A novel technique for CNT-C/C composites by dielectrophoresis and direct resistive heating TG-CVI is presented. The more uniform, aligned CNT network between the carbon fibers is achieved when the frequency is 500 Hz, and exhibit a faster rate combined with a better maximum degree of pore filling.

    7. Improved Wear Behavior of Cylindrical Roller Thrust Bearings by Three-Beam Laser Interference

      Andreas Rosenkranz, Andreas Stratmann, Carsten Gachot, Gero Burghardt, Georg Jacobs and Frank Mücklich

      Article first published online: 2 NOV 2015 | DOI: 10.1002/adem.201500320

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      The authors study the wear behavior of laser-patterned cylindrical roller thrust bearings. The tests are conducted under critical conditions with regard to wear on an adapted FE-8-test rig using a mineral oil with a low concentration of ZDDP. This study demonstrates an 83% reduction in the wear loss of the laser-patterned thrust bearing.

    8. Assembly Dependent Interfacial Property of Carbon Nanotube Fibers with Epoxy and Its Enhancement via Generalized Surface Sizing

      Chaoshuai Lei, Jingna Zhao, Jingyun Zou, Chunyang Jiang, Min Li, Xiaohua Zhang, Zuoguang Zhang and Qingwen Li

      Article first published online: 2 NOV 2015 | DOI: 10.1002/adem.201500379

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      The assembly structure of CNT fiber allows rich and different surface treatments to improve the interfacial shear strength (IFSS) as compared to carbon fibers. These treatments generalize the common concept of surface sizing by introducing an interphase inside rather than around the CNT fiber. The IFSS can be improved by more than 27%, from 47.7 to 60.6 MPa.

    9. Anisotropic Wetting and Fluidic Phenomena on Biological Texture and Hydrodynamic Experiments Testing on Different Low Viscous Resistance Surfaces

      Yuehao Luo, Xudong Wang, Gang Liu, Jianshe Wang and Wen Song

      Article first published online: 2 NOV 2015 | DOI: 10.1002/adem.201500458

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      In this article, anisotropic wetting and fluidic phenomena on biological sharkskin morphology are revealed. The wetting models based on anisotropic pattern are established and sharkskin surfaces covering different deformed textures are fabricated adopting the bio-aided method, and the relationship between contact angle/rolling angle and stretching ratio is investigated.

    10. Plasma Nitriding and DLC Coatings for Corrosion Protection of Precipitation Hardening Stainless Steel

      Eugenia L. Dalibón, María Agustina Guitar, Vladimir Trava-Airoldi, Frank Mücklich and Sonia P. Brühl

      Article first published online: 26 OCT 2015 | DOI: 10.1002/adem.201500411

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      The duplex treatment consisting in plasma nitriding and DLC deposition results in a very good protection for PH stainless steel against wear and corrosion. Corrosion of DLC is mostly dependent on the density of defects that connect the electrolyte with the metal, initiating delamination, and degradation. The nitrided layer provides in interface which improves adhesion and retards this corrosion process.

  4. Reviews

    1. Special Rolling Techniques for Improvement of Mechanical Properties of Ultrafine-Grained Metal Sheets: a Review

      Hai Liang Yu, Cheng Lu, Anh Kiet Tieu, Hui Jun Li, Ajit Godbole and Shi Hong Zhang

      Article first published online: 26 OCT 2015 | DOI: 10.1002/adem.201500369

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      Asymmetric cryorolling is one of the advanced manufacturing techniques for fabrication of UFG metal sheets, in which both additional shear strain and suppression of dynamic recovery at low temperature enhance grain refinement. The technique can enhance both strength and ductility of metal sheets.

  5. Full Papers

    1. Adhesion of Volcanic Ash Particles under Controlled Conditions and Implications for Their Deposition in Gas Turbines

      Catalina Taltavull, James Dean and Trevor William Clyne

      Article first published online: 16 OCT 2015 | DOI: 10.1002/adem.201500371

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      Experimental measurement of ash particle adhesion rates is combined with numerical modeling to establish their velocities and temperatures. Particles of ≈10–30 µm diameter are both large enough to strike solid surfaces and small enough to exceed Tg (and hence soften sufficiently to be likely to adhere).

    2. Mechanical Properties of Shark-Skin Like Structured Surfaces for High-Temperature Applications

      Antje Schlieter, R. Pflumm, I. Shakhverdova, R. Naraparaju, U. Schulz, C. Leyens, M. Schütze and W. Reimers

      Article first published online: 15 OCT 2015 | DOI: 10.1002/adem.201500416

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      Applicable processes via halogenation, laser fabrication, and laser ablation followed by oxidation to process riblets on material systems for aero-engines (Ni-based alloys, gamma TiAl) are presented. Several micrometer-sized riblets with optimum dimensions exhibiting high stability are fabricated. The riblet morphology is characterized and a study of the mechanical stability (low-cycle fatigue and quasi cyclic four-point bending tests) outlined promising results.