Possibility of controlling the shape memory effect by magnetic field

Kazuko Inoue, Kazuyuki Enami, Masafumi Igawa, Yasuo Yamaguchi, Kenji Ohoyama, Yukio Morii, Yuki Matsuoka, Kanryu Inoue

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

We have made the Heusler-type Ni2MnGa-based alloys, Ni2.18Mn0.82Ga, Ni2.19Mn0.18Ga and Ni2Mn0.92Ga1.08, which have the martensitic transformation temperature coincident with the Curie temperature. The powder neutron diffraction measurements of these alloys were performed. The Rietveld analysis of the diffraction patterns showed that at least two crystal structures coexist in each martensitic phase. For Ni2.18Mn0.82Ga and Ni2.19Mn0.81Ga, the main structure is a monoclinic one with a six-layers shuffling and a small amount of orthorhombic structure distorted from the cubic Heusler one is included. For Ni2Mn0.92Ga1.08, the main structure is tetragonal whereas a small amount of other structures seem to be included. The neutron diffraction of Ni2.19Mn0.81Ga under magnetic field up to 5 T at the coincident transformation tempe rature of 350 K shows that the magnetic field causes the phase transformation from cubic phase to martensitic one. The result suggests the possibility of controlling the shape memory effect originating from the thermoelastic martensitic transformation, by applying the external magnetic field instead of changing the temperature.

Original languageEnglish
Pages (from-to)25-33
Number of pages9
JournalInternational Journal of Applied Electromagnetics and Mechanics
Volume12
Issue number1-2
DOIs
Publication statusPublished - 2000 Jan 1

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Electrical and Electronic Engineering

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