Dresden 2009 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 26: Magnetic Shape Memory Alloys II

MA 26.6: Vortrag

Mittwoch, 25. März 2009, 16:00–16:15, HSZ 103

Orientation characterisation of NiMnGa MSM — •Claudia Hürrich, Martin Pötschke, Stefan Roth, Bernd Rellinghaus, and Ludwig Schultz — IFW Dresden, PF 27 01 16, 01171 Dresden

Magnetic shape memory alloys (MSMA) have gained a large research interest due to their capability of showing magnetic field-induced strain (MFIS). In contrast to conventional shape memory alloys, plastic deformation in the martensitic phase, which is due to twin boundary motion, may be caused not only by mechanical stress but also by an external magnetic field. Ni₅₀Mn₂₉Ga₂₁ shows magnetic field induced strain (MFIS) in single crystals. Polycrystalline Ni₅₀Mn₂₉Ga₂₁ was prepared by directional solidification and was cut erosively from a cast ingots into cubes with a 5 mm edge length. These samples have a martensite - austenite transformation at approximately 60^∘C. The change in surface topography during this transformation is followed by an optical microscope. The configuration of the twin boundaries was analysed before and after compressing the samples.

Financial support by the DFG within SPP 1239 is gratefully acknowledged.