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Processing Routes Toward Textured Polycrystals in Ferromagnetic Shape Memory Alloys
Author(s) -
Gaitzsch Uwe,
Chulist Robert,
Weisheit Linda,
Böhm Andrea,
Skrotzki Werner,
Oertel CarlGeorg,
Brokmeier HeinzGünter,
Lippmann Thomas,
Navarro Iñaki,
Pötschke Martin,
Romberg Jan,
Hürrich Claudia,
Roth Stefan,
Schultz Ludwig
Publication year - 2012
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201200084
Subject(s) - materials science , crystallite , texture (cosmology) , ferromagnetism , grain boundary , shape memory alloy , scope (computer science) , condensed matter physics , magnetic field , thermal , strain (injury) , field (mathematics) , engineering physics , metallurgy , microstructure , thermodynamics , computer science , artificial intelligence , medicine , physics , mathematics , quantum mechanics , pure mathematics , engineering , image (mathematics) , programming language
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.