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

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11 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)322-334
Number of pages13
JournalShape Memory and Superelasticity
Volume3
Issue number4
DOIs
Publication statusPublished - 2017 Dec 1

Keywords

  • Abnormal grain growth
  • Entropy of transformation
  • Equilibrium temperature
  • Ferrous shape memory alloy
  • Fe–Mn–Al–Ni
  • Nanoprecipitation
  • Thermoelastic

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials

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