Berlin 2012 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 53: Joint Session Magnetic Shape Memory Alloys II (jointly with DS, MA)

MM 53.7: Vortrag

Donnerstag, 29. März 2012, 16:30–16:45, H 0112

Twin boundaries in trained 10M Ni-Mn-Ga single crystals — •Robert Chulist¹, Alexei Sozinov², Ladislav Straka^2,3, Thomas Lippmann⁴, Carl-George Oertel¹, and Werner Skrotzki¹ — ¹Institut für Strukturphysik, Technische Universität Dresden, D-01062 Dresden, Germany — ²AdaptaMat Ltd., Yrityspiha 5, Helsinki, FIN-00390, Finland — ³Laboratory of Engineering Materials, Aalto University, PL 14200, FIN-00076 AALTO, Finland — ⁴Institut für Werkstoffforschung, Helmholtz-Zentrum Geesthacht, D-21502 Geesthacht, Germany

The arrangement of twin boundaries in trained 10M Ni-Mn-Ga single crystals was investigated by electron backscatter diffraction (EBSD) in the scanning electron microscope. Precise monoclinic structure data including direction of modulation were used to determine all possible boundaries. Besides type I, II and compound twins typical for monoclinic symmetry a boundary between two directions of modulation was also detected. Compared to EBSD analysis done with simple tetragonal structure for 10M Ni-Mn-Ga alloys, a more complex microstructure with new boundaries is revealed. The crystallographic results have also been confirmed by diffraction of high-energy synchrotron radiation.