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Promising ferromagnetic Ni–Co–Al shape memory alloy system

Appl. Phys. Lett. 79, 3290 (2001); doi:10.1063/1.1418259

Issue Date: 12 November 2001

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K. Oikawa, L. Wulff, and T. Iijima
National Institute of Advanced Industrial Science and Technology, Sendai 983-8551, Japan

F. Gejima, T. Ohmori, A. Fujita, K. Fukamichi, R. Kainuma, and K. Ishida
Department of Materials Science, Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan
A system of ferromagnetic beta phase Ni–Co–Al alloys with an ordered B2 structure that exhibits the shape memory effect has been developed. The alloys of this system within the composition range Ni (30–45 at. %) Co–(27–32 at. %) Al, undergo a paramagnetic/ferromagnetic transition as well as a thermoelastic martensitic transformation from the beta to the beta[prime](L10) phase. The Curie and the martensitic start temperatures in the beta phase can be controlled independently to fall within the range of 120–420 K. The specimens from some of the alloys undergoing martensitic transformation from ferromagnetic beta phase to ferromagnetic beta[prime] phase are accompanied by the shape memory effect. These ferromagnetic shape memory alloys hold great promise as new smart materials. ©2001 American Institute of Physics.
History: Received 5 March 2001; accepted 4 September 2001
Permalink: http://link.aip.org/link/?APPLAB/79/3290/1
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KEYWORDS and PACS

Keywords
PACS
  • 81.30.Kf
    Materials science Phase diagrams and microstructures developed by solidification and solid–solid phase transformations Martensitic transformations
  • 81.05.Bx
    Materials science Specific materials: fabrication, treatment, testing and analysis Metals, semimetals, and alloys
  • 75.50.Cc
    Magnetic properties and materials Studies of specific magnetic materials Other ferromagnetic metals and alloys
  • 62.20.Fe
    Mechanical and acoustical properties of condensed matter Mechanical properties of solids Deformation and plasticity (including yield, ductility, and superplasticity)
  • 64.70.Kb
    Equations of state, phase equilibria, and phase transitions Specific phase transitions Solid–solid transitions
  • 81.40.Lm
    Materials science Treatment of materials and its effects on microstructure and properties Deformation, plasticity, and creep
  • 75.30.Kz
    Magnetic properties and materials Intrinsic properties of magnetically ordered materials Magnetic phase boundaries (including magnetic transitions, metamagnetism, etc.)
  • 75.40.-s
    Magnetic properties and materials Critical-point effects, specific heats, short-range order
  • YEAR: 2001

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PUBLICATION DATA

ISSN:
0003-6951 (print)   1077-3118 (online)
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REFERENCES (15)
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