Polycrystalline Ni-Mn-Ga as a Potential Material for Magnetically Driven Actuators

Abstract:

Textured polycrystalline Ni-Mn-Ga alloys were prepared by directional solidification. Alloys were chosen to have the 5M modulated martensitic structure after proper heat treatment. A two-side mechanical training decreased the twin boundary pinning stress. The stress-strain behaviour for the training process and the magnetically induced stress depends on the training direction. Magnetic field induced strain was demonstrated in samples with a plate-like geometry. The influence of the microstructure on the magneto-mechanical behaviour is discussed.

• Periodical: Materials Science Forum (Volume 684)
• Pages: 129-137
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.684.129
• Online since: May 2011
• Authors: Martin Pötschke, Stefan Roth, Uwe Gaitzsch, Claudia Hürrich, Andrea Böhm, Ludwig Schultz
• Keywords: Magnetic Field Induced Strain (MFIS), Ni-Mn-Ga, Polycrystal, Texture, Training

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