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Development status of Ni-Mn-Ga ferromagnetic shape memory polycrystals after hot rolling

: Böhm, A.; Roth, S.; Gaitzsch, U.; Chulist, R.; Skrotzki, W.; Kunze, H.; Drossel, W.-G.; Neugebauer, Reimund

Borgmann, H. ; Messe und Ausstellungs-GmbH, Bremen:
Actuator 2008. 11th International Conference on New Actuators & 5th International Exhibition on Smart Actuators and Drive Systems. Proceedings : 9-11 June 2008, Bremen, Germany; Conference proceedings
Bremen: HVG, Division Messe Bremen, 2008
ISBN: 3-933339-10-3
International Conference on New Actuators <11, 2008, Bremen>
International Exhibition on Smart Actuators and Drive Systems <5, 2008, Bremen>
Conference Paper
Fraunhofer IWU ()
ferromagnetic shape memory alloy; Ni-Mn-Ga; martensitic transformation; hot-rolling

In order to obtain magnetic-field-induced strain MFIS in polycrystalline samples, the use of textured samples is most promising. The texture of the polycrystalline Ni50Mn30Ga20 magnetic shape memory alloys fabricated by hot rolling has been measured with high-energy synchrotron radiation and neutron diffraction. At room temperature the alloys used are composed of a modulated (7M) and non-modulated (NM) martensitic structure with martensitic twins. With the texture of the hot rolled alloy shows a weak recrystallization texture with {111} and <112> aligned parallel to the rolling plane and rolling direction, respectively. The set-up of the MFISdetermination device will be presented. The results are discussed with respect to processing and microstructure.