Magneto-Mechanical Behaviour of Textured Polycrystals of NiMnGa Ferromagnetic Shape Memory Alloys

Stefan Roth; Uwe Gaitzsch; Martin Pötschke; Ludwig Schultz

doi:10.4028/www.scientific.net/AMR.52.29

Paper Titles

Committees

Preface

Concepts and Physical Phenomena in Magnetic Shape Memory Science
p.3

Development of Ni-Mn-Ga Based Ferromagnetic Shape Memory Alloy by Rapid Solidification Technique
p.17

Magneto-Mechanical Behaviour of Textured Polycrystals of NiMnGa Ferromagnetic Shape Memory Alloys
p.29

Magnetization and Domain Patterns in Martensitic NiMnGa Films on Si(100) Wafer
p.35

Intermartensitic Transformations in Ni-Mn-Ga Alloys: A General View
p.47

Martensite Transformation and Magnetic Property Dependence on the Annealing Temperature in Ni-Rich Ni-Mn-Ga Alloy
p.57

Influence of Annealing Temperature on the Properties of Co-Ni-Ga Ferromagnetic Shape Memory Alloy
p.63

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Magneto-Mechanical Behaviour of Textured Polycrystals of NiMnGa Ferromagnetic Shape Memory Alloys

Abstract:

Textured polycrystalline NiMnGa alloys were prepared by directional solidification. Alloys were chosen to have either the 7M or the 5M modulated martensitic structure after proper heat treatment. Mechanical training allowed to reduce the twin boundary pinning stress to below the magnetically induced stress. Thus, magnetic field induced changes in the mechanical behaviour could be demonstrated. The conditions of preparation and mechanical training will be discussed together with their influence on structure, microstructure, and the magneto-mechanical behaviour.