Leibniz Universität Hannover Faculty Faculty of Mechanical Engineering
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Institute of Materials Science
 
Institute for Material Science Research
Completed Projects

Completed research projects at the Institute for Materials Science

Ressourceneffizienz/Nachhaltigkeit

  • FOR1766 – Teilprojekt TP4: Hochtemperatur-Formgedächtnislegierungen – Von den Grundlagen zur Anwendung
    The research unit FOR1766 combines partners from Ruhr University Bochum, University Kassel, Ludwig-Maximilians-University München and Leibniz University Hanover. For many of the envisaged applications, damage evolution under cyclic thermal and/or mechanical load will govern the fatigue life of high-temperature shape memory alloys (HTSMAs). Thus, the focus of the project in Hanover is the functional and structural thermomechanical fatigue of HTSMAs. To analyse the mechanisms that lead to functional degradation, this subproject concentrates on the functional fatigue tests of Ti-Ta HTSMAs in isostress thermal cycling tests under tensile load conditions and also on the In-situ thermo-mechanical cycling experiments. To understand the structural fatigue processes, within this project, structural fatigue test under high cycle thermomechanical loading conditions and crack propagation test will be carried out. To gain a fundamental understanding of the dominating microstructural processes, both post-mortem and in-situ fatigue experiments in the neutron source will be conducted.
    Year: 2015
    Funding: DFG
    Duration: bis 10.2018
  • SPP 1640 – Teilprojekt A4: Elektrochemisch unterstütztes Fügen blechförmiger Werkstoffe
    This research project investigates the cold pressure welding of similar and dissimilar metals by incremental forming and inline electrochemical surface activation. The project intends to identify and analyse the mechanisms of cold pressure welding in order to improve current cold welding processes in terms of process flexibility and joint strength. The joining with electrochemical support (EUCF) is a new process that intends to cold pressure weld a broad range of metal pairs. Major innovations include the determined modification of the micro and macroscopic surface structure e.g. by the inline activation of metallic surfaces using electrochemical reactions (like oxide reduction and metal layer deposition). The course and result of the following pressure welding process is supported by a special tool set-up and an adapted incremental process control to ensure a sufficient bonding process with locally restricted high deformation ratios. The pressure welding process will be realized with support of robotic actuators and an incremental process control to allow both partial and fully joining of hybrid products/assemblies made from various semi-finished parts.
    Year: 2015
    Funding: DFG
    Duration: bis 31/12/18

[uncategorized]

  • Aluminiumlegierungen mit angepasstem Schmelzintervall für das prozessintegrierte Ausschäumen beim Strangpressen
    The aim of this project is to develop the basics for the direct foaming of hollow structures made of aluminum alloys by means of composite extrusion. The outer structural material of these components takes over force distribution, corrosion protection, as well as acting tensile forces, while the internal foam material increases the bending stiffness, damping properties, and energy absorption of the system. For instance, such extruded, foam-filled structures can advantageously be used in the automotive industry as crash profiles. Nevertheless, process-integrated foam-filled structures or foam structures with a dense cover layer are not yet used industrially in mass production, despite their superior property spectrum. This could be due to the limited freedom of design in the production of foam-filled components with dense cover layers, in addition to elaborate additional operations required during their manufacturing process, such as additional foaming, manipulation, and joining processes
    Year: 2017
    Funding: DFG
    Duration: 05/2017-01/2021
  • Herstellung und Applikation thermoplastumhüllter Lotpartikel für die löttechnische Fertigung mit pulverförmigen Hartloten AiF-Projekt
    Within the scope of this project, brazing powders coated with a thermoplastic sheath are examined. The purpose of the coating is to fulfill two tasks: On the one hand, the metallic particles are electrically insulated by their coating, so that it is possible to aplly them by means of electrostatic powder coating processes prior to brazing, which is a new method to aplly brazing powders. From a scientific-technical point of view, suitable thermoplastics have to be found and a simple and economical coating process for the brazing powder has to be developed. Substantial technical, economic and ecological advantages can be achieved compared to solvent based brazing pastes. Users of this technology include both brazin powder products manufacturers who are expanding their portfolio and users of brazing technology who are enabled to use the product for new economical solder application processes.
    Year: 2017
    Funding: AiF
    Duration: 01.02.2017-31.01.2019

Last Change: 24.04.24 Print

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