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Effect of grain size on superelasticity in Fe-Mn-Al-Ni shape memory alloy wire

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Author(s): T. Omori | M. Okano | R. Kainuma

Journal: APL Materials
ISSN 2166-532X

Volume: 1;
Issue: 3;
Start page: 032103;
Date: 2013;
Original page

ABSTRACT
Effects of grain size on superelastic properties in Fe-34Mn-15Al-7.5Ni alloy wires with a ⟨110⟩ fiber-texture were investigated by cyclic tensile tests. It was confirmed that the critical stress for induced martensitic transformation and the superelastic strain are functions of relative grain size d/D (d: mean grain diameter, D: wire diameter), and that the critical stress is proportional to (1–d/D)2 as well as in Cu-based shape memory alloys. A large superelastic strain of about 5% was obtained in the specimen with a large relative grain size over d/D = 1.
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