Magnetic Shape Memory Effect in Ni-Mn-Ga Single Crystal

Abstract:

Magnetic shape memory effect is general name for several effects in which the most visible feature is huge strain induced by magnetic field. Magnetic field-induced structure reorientation (MIR) occurs due to motion of twin boundaries in single phase. As the magnetic field is a relatively weak force compared with mechanical stress, very high mobility of twin boundaries is crucial. Here we study the properties of martensite relevant for this effect using X-ray diffraction, optical and electron microscopy, magnetic observation and mechanical testing. In 10M modulated martensite, two types of mobile twin boundary (type I and type II) are observed with complex layered microstructures consisting of a hierarchy of twinning systems. We search for analogue with non-magnetic Cu-Ni-Al shape memory alloy.

• Periodical: Materials Science Forum (Volume 879)
• Pages: 738-743
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.879.738
• Online since: November 2016
• Authors: Oleg Heczko*, Vít Kopecký, Jan Drahokoupil, Marek Vronka, Oleksiy Perevertov, Jaromír Kopeček
• Keywords: Ferromagnetic Shape Memory Alloy, Magnetic Domains Structure, Magnetic Shape Memory Effect, Magnetically-Induced Reorientation, Modulated Martensite, Ni-Mn-Ga, Twin Boundary

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