Modeling of rearrangement yield surface under biaxial magnetic field in Ni-Mn-Ga shape memory alloys
|Laurent Hirsinger , Nicolas Creton|
Institut FEMTO-ST, Dpt Applied Mechanics (FEMTO), 24 Chemin de l'Epitaphe, Besançon 25000, France
In the search of new active materials, Ni-Mn-Ga ferromagnetic shape memory alloys have a prominent position thanks to their capability to rapidly develop a very important strain. This particular behavior is in fact due to variant structure rearrangement of twinned martensitic platelets (5M, 7M or TNM) at constant temperature. To predict this strain induced by an applied magnetic field and/or an applied stress, the authors have proposed a magneto-mechanical model based on phenomenology, thermodynamics of irreversible processes and changing of scale (or homogenization). More exactly, this model has been developed and validated for uniaxial magnetic field (in an fixed direction), but, for multiaxial stress in a single crystal with 5M and 7M twinned martensite.
Presentation: oral at E-MRS Fall Meeting 2005, Symposium C, by Laurent Hirsinger
See On-line Journal of E-MRS Fall Meeting 2005
Submitted: 2005-06-10 15:57 Revised: 2009-06-07 00:44