Promising ferromagnetic Ni-Co-Al shape memory alloy system

K. Oikawa, L. Wulff, T. Iijima, F. Gejima, T. Ohmori, A. Fujita, K. Fukamichi, R. Kainuma, K. Ishida

Research output: Contribution to journalArticlepeer-review

351 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)3290-3292
Number of pages3
JournalApplied Physics Letters
Issue number20
Publication statusPublished - 2001 Nov 12


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