Dresden 2026 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 21: Phase Transformations II
MM 21.8: Vortrag
Mittwoch, 11. März 2026, 12:15–12:30, SCH/A215
Transforming martensite in Ni-Mn-Ga within picoseconds — •Klara Lünser1,2, Yuru Ge3,4, Fabian Ganss3, Daniel Schmidt5,6, Daniel Hensel5, Mike J. Bruckhoff7, Bruno Neumann3,4, Mariana Brede5, Sakshath Sadashivaiah8,9, Markus E. Gruner7, Peter Gaal5,6, and Sebastian Fähler3 — 1University Duisburg-Essen — 2RCFEMS, Bochum — 3HZDR, Dresden — 4TU Dresden — 5Leibniz IKZ, Berlin — 6TXproducts, Hamburg — 7CENIDE, University of Duisburg-Essen — 8Helmholtz-Institut Jena — 9GSI Darmstadt
Martensitic transformations are driving a wide range of emerging applications, including high-stroke actuation, mechanocaloric refrigeration, and thermoelastic energy harvesting. However, systematic investigations of the fast dynamics and fundamental speed limits of martensitic transformations are scarce. In this study, we employed a synchrotron-based time-resolved diffraction technique to investigate the martensitic transformation induced by 200 fs laser pulses. Our results show that the transformation from martensite to austenite occurs within 100 ps, limited by the synchrotron probe pulse duration. We also demonstrated that an appropriate laser fluence and undercooling can complete a full transformation cycle within 5 ns, the fastest value reported for martensitic transformation. Our study highlights the importance of analyzing the lattice temperature during martensitic transformations and discusses the need for and limits of this approach. Furthermore, we found that stress must be considered as a competing influence on the martensitic transformation, in addition to temperature.
Keywords: martensitic transformation; Ni-Mn-Ga; time-resolved diffraction