This work is supported by DFG SPP 1239. Experimental assistance by the Research Technology Department of the IFW Dresden is gratefully acknowledged.
Reversible Magnetic Field Induced Strain in Ni2MnGa-Polymer-Composites†
Article first published online: 18 OCT 2011
Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Advanced Engineering Materials
Volume 14, Issue 1-2, pages 20–27, February 2012
How to Cite
Kauffmann-Weiss, S., Scheerbaum, N., Liu, J., Klauss, H., Schultz, L., Mäder, E., Häßler, R., Heinrich, G. and Gutfleisch, O. (2012), Reversible Magnetic Field Induced Strain in Ni2MnGa-Polymer-Composites. Adv. Eng. Mater., 14: 20–27. doi: 10.1002/adem.201100128
- Issue published online: 7 FEB 2012
- Article first published online: 18 OCT 2011
- Manuscript Revised: 26 AUG 2011
- Manuscript Received: 28 APR 2011
Composite materials consisting of magnetic shape memory alloy particles and a polymer matrix combine the advantages of both material classes: the high achievable magnetic field induced strain (MFIS) of 6% of Ni-Mn-Ga with a ductile matrix. Engineering the particle-matrix interface as well as matching stiffness of polymer matrix is of importance for achieving high reversible MFIS to use this material as actuator or damper. We investigated those properties for Ni50.9Mn27.1Ga22.0 and Ni50.3Mn24.6Ga25.1 polymer composites. Particles were produced by gently crushing melt-extracted and subsequently annealed fibres. At room temperature, the Ni50.9Mn27.1Ga22.0 particles exhibit a 5M martensitic structure, while the Ni50.3Mn24.6Ga25.1 particles are austenitic. These particles were embedded into the polymer, either a stiff epoxy resin or a soft polyurethane. In response to an external applied magnetic field, the particles tend to relocate within the polyurethane due to its very low Young's modulus and magnetostatic interaction between particles. Slightly stiffer polymer matrices are advantageous for achieving controllable MFIS. In Ni50.9Mn27.1Ga22.0 epoxy composites, a MFIS of 0.1% was observed and was resettable by rotating the magnetic field by 90°. Furthermore, single fibre pull-out tests indicated significant improvements of the interfacial properties when using silane coupling agent treated fibres.