Martensitic Transformation and Superelasticity in Fe–Mn–Al-Based Shape Memory Alloys

研究成果: Article査読

27 被引用数 (Scopus)

抄録

Ferrous shape memory alloys showing superelasticity have recently been obtained in two alloy systems in the 2010s. One is Fe–Mn–Al–Ni, which undergoes martensitic transformation (MT) between the α (bcc) parent and γ′ (fcc) martensite phases. This MT can be thermodynamically understood by considering the magnetic contribution to the Gibbs energy, and the β-NiAl (B2) nanoprecipitates play an important role in the thermoelastic MT. The temperature dependence of critical stress for the MT is very small (about 0.5 MPa/°C) due to the small entropy difference between the parent and martensite phases in the Fe–Mn–Al–Ni alloy, and consequently, superelasticity can be obtained in a wide temperature range from cryogenic temperature to about 200 °C. Microstructural control is of great importance for obtaining superelasticity, and the relative grain size is among the most crucial factors.

本文言語English
ページ(範囲)322-334
ページ数13
ジャーナルShape Memory and Superelasticity
3
4
DOI
出版ステータスPublished - 2017 12月 1

ASJC Scopus subject areas

  • 材料力学
  • 材料科学(全般)

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