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Cast and rolling textures of NiMnGa alloys

: Chulist, R.; Pötschke, M.; Brokmeier, H.G.; Garbe, U.; Oertel, C.G.; Böhm, A.; Skrotzki, W.

Materials Research Society:
Magnetic shape memory alloys : November 26 - 30, 2007, Boston, Massachusetts, USA; 2007 MRS fall meeting ; Symposium BB
Red Hook, NY: Curran, 2008 (Materials Research Society Symposium Proceedings 1050)
ISBN: 978-1-605-60815-0
Materials Research Society (Fall Meeting) <2007, Boston/Mass.>
Symposium BB "Magnetic Shape Memory Alloys" <2007, Boston/Mass.>
Conference Paper
Fraunhofer IWU ()
Formgedächtnislegierung; Nickellegierung; chemische Zusammensetzung; polykristalliner Stoff; gerichtete Erstarrung; Warmwalzen; Stängelkristallgefüge; Verfahrensparameter; martensitische Umwandlung; Umwandlungstemperatur; Martensit; orthorhombische Kristallstruktur; tetragonale Kristallstruktur; Schmelztextur; Walztextur; Rekristallisationstextur; Texturanalyse; Röntgenbeugung; Synchrotronstrahlung; Neutronenbeugung; Polfigur

The texture of two polycrystalline NiMnGa magnetic shape memory alloys fabricated by directional solidification and hot rolling has been measured with high-energy synchrotron radiation and neutron diffraction. At room temperature the alloys used are composed of a 7M (modulated) and NM (non-modulated) martensitic structure. The texture of the directionally solidified alloy for all phases is a pronounced fibre texture with <100> preferentially aligned along the growth direction. In the directionally solidified case a variant selection took place with (001) dominating. 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 texture results are discussed with respect to material, processing and phase transformations including variant selection.