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Microstructure and texture of a Ni-Mn-Ga alloy after hot extrusion and post heat treatments

 
: Böhm, A.; Weisheit, L.; Chulist, R.; Skrotzki, W.; Drossel, W.-G.; Neugebauer, Reimund

Borgmann, H. ; Wirtschaftsförderung Bremen GmbH -WFB-; Hanseatische Veranstaltungs GmbH -HVG-, Geschäftsbereich Messe Bremen, Bremen:
ACTUATOR 2010, 12th International Conference on New Actuators & 6th International Exhibition on Smart Actuators and Drive Systems. Conference Proceedings : 14. - 16. Juni 2010, Bremen, Germany
Bremen: WFB, 2010
ISBN: 978-3-933339-13-3
ISBN: 978-3-933339-12-6
pp.742-745
International Conference on New Actuators (ACTUATOR) <12, 2010, Bremen>
International Exhibition on Smart Actuators and Drive Systems <6, 2010, Bremen>
English
Conference Paper
Fraunhofer IWU ()
ferromagnetic shape memory alloy; Ni-Mn-Ga; martensitic transformation; hot extrusion

Abstract
The texture in a polycrystalline Ni50Mn29Ga21 magnetic shape-memory alloy deformed by high-pressure torsion (HPT) at 1173 K was investigated with high-energy synchrotron radiation. HPT changed the extrusion texture to a predominant slightly rotated cube {0 0 1} 1 0 0 and a weak F {1 1 0}1 0 0 component. During HPT the grain structure coarsened. Phase transformations during cooling from the deformation temperature led to coarse and fine sets of martensitic twin variants. The results are discussed with respect to deformation mode, grain growth and phase transformations.

: http://publica.fraunhofer.de/documents/N-134108.html