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.