Journal
MATERIALS TRANSACTIONS
Volume 45, Issue 2, Pages 173-177Publisher
JAPAN INST METALS & MATERIALS
DOI: 10.2320/matertrans.45.173
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
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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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