Polycrystalline Ni-Mn-Ga as a Potential Material for Magnetically Driven Actuators
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.
M. Pötschke et al., "Polycrystalline Ni-Mn-Ga as a Potential Material for Magnetically Driven Actuators", Materials Science Forum, Vol. 684, pp. 129-137, 2011