Combinatorial Investigation of Ferromagnetic Shape-Memory Alloys in the Ni-Mn-Al Ternary System Using a Composition Spread Technique

Olugbenga O. Famodu; Jason Hattrick-Simpers; Maria Aronova; Kao-Shuo Chang; Makoto Murakami; Manfred Wuttig; Teiko Okazaki; Yasubumi Furuya; Lee A. Knauss; Leonid A. Bendersky; Frank. S. Biancaniello; Ichiro Takeuchi

doi:10.2320/matertrans.45.173

Olugbenga O. Famodu, Jason Hattrick-Simpers, Maria Aronova, Kao-Shuo Chang, Makoto Murakami, Manfred Wuttig, Teiko Okazaki, Yasubumi Furuya, Lee A. Knauss, Leonid A. Bendersky, Frank. S. Biancaniello, Ichiro Takeuchi

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Keywords: combinatorial, ferromagnetic shape-memory alloys, composition spreads, thin-film, phase diagram, martensitic transitions, quantitative magnetization mapping, scanning superconducting quantum interference device (SQUID) microscopy, magnetization, NiMnAl

JOURNAL FREE ACCESS

2004 Volume 45 Issue 2 Pages 173-177

DOI https://doi.org/10.2320/matertrans.45.173

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Abstract

Using a thin-film composition spread technique, we have mapped the phase diagram of the Ni-Mn-Al ternary system in search of ferromagnetic shape-memory alloys (FMSA). A characterization technique that allows detection of martensitic transitions by visual inspection using micromachined cantilever arrays was combined with quantitative magnetization mapping using scanning superconducting quantum interference device (SQUID) microscopy. A large compositional region in the Al deficient part of the phase diagram was found to be ferromagnetic and reversibly martensitic at room temperature. In addition, in the Al rich region, a new compositional range that displays marked ferromagnetism was found.

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