Berlin 2012 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 17: Poster Session

MM 17.27: Poster

Montag, 26. März 2012, 17:00–19:00, Poster B

Phase Field Simulations of Martensitic Transformation in Thin Films — •Alexander Auge, Niclas Teichert, and Andreas Hütten — Bielefeld University, Department of Physics, Universitätsstr. 25, 33615 Bielefeld, Germany

Magnetic shape memory materials like Ni-Mn-Ga and Ni-Mn-Sn have been intensively investigated in the past few years due to their potential applications in magnetic cooling or actuators. The physical origin of these effects is the martensitic transformation (MT) in combination with ferromagnetism. For many applications, like magnetic cooling, thin films are advantageous or even mandatory. The confinement due to the film thickness and also the constraint of the substrate can have a major influence on the transition and even hinder a MT completely. To understand what the major contributions to the change in the MT are and how to optimize the performance of the MT in thin films, phase field simulations are carried out. A three dimensional Landau theory for multivariant phase transformations developed by Levitas et al. [1] is used in the framework of finite element simulations. The most relevant energy contributions in dependence of film thickness and the resulting microstructure are presented.

[1] V. I. Levitas and D. L. Preston, Phys. Rev. B 66, 134207 (2002)