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MA: Fachverband Magnetismus

MA 25: Magnetic Shape Memory Alloys II (jointly with MM)

MA 25.2: Talk

Tuesday, March 15, 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.