Processing Routes Toward Textured Polycrystals in Ferromagnetic Shape Memory Alloys |
| |
Authors: | Uwe Gaitzsch Robert Chulist Linda Weisheit Andrea Böhm Werner Skrotzki Carl‐Georg Oertel Heinz‐Günter Brokmeier Thomas Lippmann Iñaki Navarro Martin Pötschke Jan Romberg Claudia Hürrich Stefan Roth Ludwig Schultz |
| |
Affiliation: | 1. IFW Dresden, Helmholtzstr. 20, 01069 Dresden, Germany;2. Fraunhofer IWU, N?thnitzer Str. 44, 01187 Dresden, Germany;3. Tech. University Dresden, Inst. Strukturphys., 01062 Dresden, Germany |
| |
Abstract: | Ni–Mn–Ga single crystals can produce large strain in moderate magnetic fields. It is the scope of this article to demonstrate, that also polycrystalline materials can show strain in a magnetic field, so called MFIS (magnetic field‐induced strain). In order to design functional polycrystalline materials the interactions of twin boundaries and grain boundaries have to be understood. Therefore, different ways of introducing a texture into Ni–Mn–Ga polycrystals are presented. The different kinds of texture and the consequences for the corresponding materials are discussed. Moreover, thermal, magnetic, and/or mechanical training concepts are presented and their working principle is explained. Several possibilities of evaluating the MFIS capability of the resulting samples are displayed. Finally methods of increasing the strain further are discussed. |
| |
Keywords: | |
|
|