A5008350688- Cellular and Composite Structures
- Aluminum Alloys Composites Properties
- Nuclear Physics and Applications
- Aluminum Alloy Microstructure Properties
- Pickering emulsions and particle stabilization
- Fuel Cells and Related Materials
- Microstructure and mechanical properties
- Polymer Foaming and Composites
- Electron and X-Ray Spectroscopy Techniques
- Advancements in Solid Oxide Fuel Cells
- Advanced Materials Characterization Techniques
- Advancements in Battery Materials
- High-pressure geophysics and materials
- Electrocatalysts for Energy Conversion
- Nanoporous metals and alloys
- Advanced Battery Technologies Research
- Advanced X-ray Imaging Techniques
- Atomic and Subatomic Physics Research
- Nuclear reactor physics and engineering
- Nuclear Materials and Properties
- Magnetic properties of thin films
- Surface and Thin Film Phenomena
- Metallic Glasses and Amorphous Alloys
- Advanced Chemical Physics Studies
- High Temperature Alloys and Creep
Helmholtz-Zentrum Berlin für Materialien und Energie
2016-2025
Technische Universität Berlin
2016-2025
The University of Sydney
2022
Helmholtz Zentrum München
2019
Helmholtz Association of German Research Centres
2019
Technical University of Darmstadt
2016
Nagoya Institute of Technology
2016
University of Potsdam
2015
Fraunhofer Institute for Telecommunications, Heinrich Hertz Institute
2002-2012
Fraunhofer Institute for Production Systems and Design Technology
2008-2012
Abstract Porous metals and metallic foams are presently the focus of very active research development activities. There currently around 150 institutions working on worldwide, most them focussing their manufacture characterisation. Various companies developing producing these materials which now being used in numerous industrial applications such as lightweight structures, biomedical implants, filters, electrodes, catalysts, heat exchangers. This review summarizes recent developments...
The authors report on in situ investigations of liquid water evolution and transport an undisturbed operating fuel cell at the microscopic level. Synchrotron x-ray radiography enhances spatial resolution by two orders magnitude compared to state-of-the-art techniques this field. primary spots formation, their growth, inside porous gas diffusion material were analyzed; correlations between conditions dynamics droplet formation are described. Previous findings from modeling simulation...
Abstract The history of metallic foams and the key innovations that have led to variety processing methods known today are reviewed. It is evident idea foaming metals very old most techniques used been proposed already in 1950s. important milestones development technologies some attempts commercialize metal
Neutron imaging can provide two- or three-dimensional, spatially resolved images of the internal structure bulk samples that are not accessible by other techniques, making it a unique tool with many potential applications. The method is now well established and available at neutron sources worldwide. This review will give survey technique special focus on tomography; basics as technology instrumentation be outlined, techniques illustrated representative While first part paper focuses...
Abstract Sandwich panels consisting of a highly porous aluminium foam core and alloy face sheets are manufactured by roll‐bonding to densified mixture metal powders – usually Al‐Si or Al‐Si‐Cu alloys with 6–8% Si 3–10% Cu titanium hydride, foaming the resulting three‐layer structure thermal treatment. We review various processing steps sandwich (AFS) metallurgical processes during foaming, compare process alternative ways manufacture AFS, e.g. adhesive bonding, give an overview available...
Neutron imaging is a non-destructive technique that can reveal the interior of many materials and engineering components also probe magnetic fields. Within past few years, several new modes have been introduced extend scope neutron beyond conventional attenuation imaging, yielding both 2- 3D information about properties phenomena inaccessible until now. We present an overview most important advances in application research with focus on novel techniques such as energy-selective...
Structural changes in Li 2 MnO 3 cathode material for rechargeable Li‐ion batteries are investigated during the first and 33 rd cycles. It is found that both participation of oxygen anions redox processes + ‐H exchange play an important role electrochemistry . During activation, removal from along with gives rise to formation a layered ‐type structure, while presence protons interslab region, as result electrolyte oxidation exchange, alters stacking sequence layers. re‐insertion by...
The potential for applying metal foams in lightweight construction is mainly based on the increased stiffness of two flat or curved sheets that are separated by a foam layer as compared to single sheet same weight. By using sandwiches with an aluminum-foam core, it possible obtain higher and rigidity, maintaining stability against buckling additionally making use high energy dissipation capability foams. A recent highlight (AFSs) space-frame constructions.
Abstract Liquid metal foam can be generated by creating gas inside a liquid or semi‐liquid metallic melt which has been pre‐treated in suitable way. Such foams are self‐supporting disordered structures complete analogy to aqueous foams. The stabilisation mechanism of is still not fully understood. In order facilitate discussion the various methods for making such classified with respect mode generation and type used foaming. Metal produced injection from an external source in‐situ nucleation...
Metallic foams have become an attractive research field both from the scientific viewpoint and prospect of industrial applications. Various methods for making such are available. Some techniques start specially prepared molten metals with adjusted viscosities. Such melts can be foamed by injecting gases or adding gas-releasing blowing agents which decompose in-situ, causing formation bubbles. A further way is to solid precursors containing a agent. These mixing metal powders agent,...
Abstract The natural aging behavior of pure ternary Al‐Mg‐Si alloys is investigated by measuring hardness, electrical resistivity and positron lifetime, as well carrying out thermal analysis atom probe microscopy. It found that several distinct temporal stages can be distinguished in which one these quantities shows a characteristic times coincide for many measurements. rate change the measured data correlated with proposed solute dynamics during both takes place prior to artificial (natural...
The evolution of liquid water and its transport through the porous gas diffusion media in an operating fuel cell were investigated applying experimental setup for high spatial resolution 3μm. Fundamental aspects cluster formation hydrophobic/hydrophilic materials as well processes multiphase flow are addressed. obtained distributions provide a detailed insight membrane electrode assembly with regard on existence water. In addition, results approve theories used within framework percolation...