Modelling Rearrangement Process of Martensite Platelets in a Magnetic Shape Memory Alloy Ni2MnGa Single Crystal under Magnetic Field and (or) Stress Action

Jean-Yves Gauthier (1) , Christian Lexcellent (2) , Arnaud Hubert (1) , Joël Abadie (1) , Nicolas Chaillet (1)

1 LAB - Laboratoire d'automatique de Besançon
2 FEMTO-ST - Franche-Comté Électronique Mécanique, Thermique et Optique - Sciences et Technologies (UMR 6174)

The aim of the paper is the modelling of the rearrangement process between martensite variants in order to use Magnetic alloys (MSMs) as actuators. In the framework of the thermodynamic of irreversible processes, an efficient choice of the internal variables in order to take into account the magnetic and the mechanical actions and a free energy function are stated. The behaviour is chosen as magnetically reversible and mechanically irreversible. An equivalence between magnetic field action H and uniaxial stress action o for the initiation of the rearrangement is established. Finally, moel predictions are compared with experimental measurements.

Mots clés: modelling; Magnetic shape memory alloys; reorientation process; single crystal; actuator; modelling.

Domaines: Micro et nanotechnologies/Microélectronique

Jean-Yves Gauthier, Christian Lexcellent, Arnaud Hubert, Joël Abadie, Nicolas Chaillet. Modelling Rearrangement Process of Martensite Platelets in a Magnetic Shape Memory Alloy Ni2MnGa Single Crystal under Magnetic Field and (or) Stress Action. Journal of Intelligent Material Systems and Structures, 2007, 18 (3), pp.289-299. ⟨10.1177/1045389X06066094⟩. ⟨hal-00191080⟩