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

APL Materials - Tập 1 Số 3 - 2013
Toshihiro Omori1, M. Okano1, Ryosuke Kainuma1
1Tohoku University Department of Materials Science, Graduate School of Engineering, , 6-6-02 Aoba-yama, Sendai 980-8579, Japan

Tóm tắt

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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Tài liệu tham khảo

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Tập 1 Số 3

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