Dresden 2011 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 25: Magnetic Shape Memory Alloys II (jointly with MM)
MA 25.2: Vortrag
Dienstag, 15. März 2011, 13:45–14:00, HSZ 103
Cyclic fibre texture in hot extruded Ni50Mn29Ga21 — •Robert Chulist1, Werner Skrotzki1, Carl-Georg Oertel1, Andrea Böhm2, Heinz-Guenter Brokmeier3, and Thomas Lippmann4 — 1Institut für Strukturphysik, Technische Universitaet Dresden, D-01062 Dresden, Germany — 2Fraunhofer-Institut für Werkzeugmaschinen und Umformtechnik, D-01187 Dresden, Germany — 3Institut für Werkstoffforschung, GKSS Forschungszentrum Geesthacht, D-21494 Geesthacht, Germany — 4Institut für Werkstoffforschung, GKSS Forschungszentrum Geesthacht, D-21502 Geesthacht, Germany
The cyclic texture in polycrystalline Ni50Mn29Ga21 magnetic shape memory alloy fabricated by hot extrusion was investigated with high-energy synchrotron radiation, neutron diffraction and electron backscatter diffraction. Combination of these techniques reveals that the texture of the hot extruded sample is quite complex. It is composed of components related to the radial direction and rotated around the extrusion axis. Additionally, the dominant texture components change from the centre to the edge of the rod. The recrystallized grains contain a lot of twins with the trace of the twin boundaries preferentially aligned along the extrusion and radial direction showing the cyclic nature of the texture and microstructure, too. The results are discussed with respect to deformation mode, phase transformations, starting grain structure and texture.