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Applied Physics Letters / Volume 79 / Issue 20 / MAGNETISM AND SUPERCONDUCTIVITY

Appl. Phys. Lett. 79, 3290 (2001); doi:10.1063/1.1418259 (3 pages)

Promising ferromagnetic Ni–Co–Al shape memory alloy system

K. Oikawa1, L. Wulff1, T. Iijima1, F. Gejima2, T. Ohmori2, A. Fujita2, K. Fukamichi2, R. Kainuma2, and K. Ishida2

1National Institute of Advanced Industrial Science and Technology, Sendai 983-8551, Japan
2Department of Materials Science, Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan

(Received 5 March 2001; accepted 4 September 2001)

A system of ferromagnetic β 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 β to the β′(L10) phase. The Curie and the martensitic start temperatures in the β 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 β phase to ferromagnetic β′ 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.

© 2001 American Institute of Physics

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KEYWORDS and PACS

Keywords

nickel alloys, cobalt alloys, aluminium alloys, ferromagnetic materials, shape memory effects, martensitic transformations, Curie temperature, thermoelasticity

PACS

  • 81.30.Kf

    Martensitic transformations

  • 81.05.Bx

    Metals, semimetals, and alloys

  • 75.50.Cc

    Other ferromagnetic metals and alloys

  • 62.20.F-

    Deformation and plasticity

  • 64.70.K-

    Solid-solid transitions

  • 81.40.Lm

    Deformation, plasticity, and creep

  • 75.30.Kz

    Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)

  • 75.40.-s

    Critical-point effects, specific heats, short-range order

ARTICLE DATA

Permalink
http://link.aip.org/link/doi/10.1063/1.1418259

PUBLICATION DATA

ISSN:

0003-6951 (print)  
1077-3118 (online)

Publisher:

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
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    S. J. Murray, M. Marioni, S. M. Allen, and R. C. O'Handley, Appl. Phys. Lett. 77, 886 (2000)APPLAB000077000006000886000001.

    A. Fujita, K. Fukamichi, F. Gejima, R. Kainuma, and K. Ishida, Appl. Phys. Lett. 77, 3054 (2000)APPLAB000077000019003054000001.

    O. Song, C. A. Balletine, and R. C. O'Handley, Appl. Phys. Lett. 64, 2593 (1994)APPLAB000064000019002593000001.

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