Shape Memory Behavior of Ni-Mn-Ga Sputtered Films under a Magnetic Field

Makoto Ohtsuka; Masaki Sanada; Minoru Matsumoto; Toshiyuki Takagi; Kimio Itagaki

doi:10.2320/matertrans.44.2513

Makoto Ohtsuka, Masaki Sanada, Minoru Matsumoto, Toshiyuki Takagi, Kimio Itagaki

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Keywords: nickel-manganese-gallium, ferromagnetic shape memory alloy, sputter deposition, constraint-aging, shape memory effect, magnetic field

JOURNAL FREE ACCESS

2003 Volume 44 Issue 12 Pages 2513-2519

DOI https://doi.org/10.2320/matertrans.44.2513

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Abstract

The shape memory behavior under the magnetic field up to 5 T was observed in Ni-Mn-Ga sputtered films. The sputtered films were heat-treated at 1073 K for 36 ks for homogenization and aged at 673 K for 14.4 and 56.7 ks in a constraint condition. The martensitic transformation temperatures and Curie temperature of the obtained films were higher than room temperature. The martensitic transformation temperatures increased under a magnetic field. Furthermore, a shape memory effect was observed by increasing and decreasing of the magnetic field.

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