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NiMn‐Based Alloys and Composites for Magnetically Controlled Dampers and Actuators
Author(s) -
Liu Jian,
Scheerbaum Nils,
KauffmannWeiss Sandra,
Gutfleisch Oliver
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.201200038
Subject(s) - materials science , shape memory alloy , magnetic refrigeration , brittleness , composite material , actuator , magnetic field , thermoelectric effect , nanoindenter , magnetization , electrical engineering , physics , quantum mechanics , nanoindentation , thermodynamics , engineering
As a new class of magnetically driven active materials, magnetic shape memory (MSM) alloys show large strains of up to 10% in Ni 2 MnGa single crystal with a modulated martensitic structure. The magnetic field induced twin boundary motion can be exploited for actuators, sensors, and as it is an energy dissipating process, also for vibration damping devices. However, single crystals of Ni 2 MnGa are difficult to prepare and are inherently very brittle. One solution is the use of aligned MSM particles suspended in a stiffness‐matched polymer matrix. In this review, we focus on the preparation and characterization of textured NiMn‐based MSM composite. Essential issues, e.g., the criterion of polymer selection and the interface of MSM particles and polymer are discussed. Second aspect of the paper is to review recent developments in metamagnetic shape memory NiMn‐(In,Sn,Sb) systems which exhibit field‐driven multifunctional properties such as magnetocaloric effect, magnetoresistant change, magnetoelectricity, and thermoelectricity.