Regensburg 2007 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 15: Poster:ThinFilms(1-33),Transp.(34-49),ExchBias(50-56),
Spindynamics(57-70),Micro-nanostr.Mat.(71-82),
Particles/Clust.(83-88), Mag.Imag./Surface(89-96),
Spinelectronics(97-109), Theory/Micromag.(110-116),
Spinstruct/Phasetr.(117-128),Magn.Mat.(129-139),
Aniso.+Measuring(140-145), MolMag.(146-152),
MSMA(153-156)

MA 15.156: Poster

Dienstag, 27. März 2007, 15:00–19:00, Poster A

Towards phase-field modelling of magnetically induced microstructure evolution Towards phase-field modelling of *magnetically induced microstructure evolution — •Britta Nestler — Institute for Computational Engineering, Karlsruhe University of Applied Sciences, Karlsruhe, Germany

The magnetomechanical responses of magnetic shape memory (MSM) alloys to external magnetic fields are correlated with the coupled magneto-elastic domain structure evolutions in these materials. Hence, the kinetic pathways of the domain evolutions play a key role in determining the materials properties. Mesoscopic simulations based on phase-field modelling can provide valuable information to understand the dynamic processes and main quantities affecting the MSM effect. A phase-field model for polycrystals is presented and simulation results of three dimensional grain structures are shown. To consider effects of an external magnetic field the model formulation has to be modified by including elastic, magnetic and elastomagnetic free energy contributions and different martensitic crystal structures.