MATERIALS TRANSACTIONS
Combinatorial Investigation of Ferromagnetic Shape-Memory Alloys in the Ni-Mn-Al Ternary System Using a Composition Spread Technique
Olugbenga O. FamoduJason Hattrick-SimpersMaria AronovaKao-Shuo ChangMakoto MurakamiManfred WuttigTeiko OkazakiYasubumi FuruyaLee A. KnaussLeonid A. BenderskyFrank. S. BiancanielloIchiro Takeuchi
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Volume 45 (2004) Issue 2 Pages 173-177

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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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© 2004 The Japan Institute of Metals and Materials
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