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<p>The present paper focuses on the evolution of micro- and nanostructures during a cyclic heat treatment in a Fe<sub>41</sub>Mn<sub>34.2</sub>Al<sub>14.1</sub>Ni<sub>7.7</sub>Cr<sub>3</sub> (at.-%) shape memory alloy (SMA). Crystallographic orientation and subgrain structures of the obtained single crystal after a cyclic heat treatment have been investigated using optical microscopy and electron backscatter diffraction analysis. Subsequent to the cyclic heat treatment, an aging process (200&#xa0;°C, 3&#xa0;h) has been applied to introduce nanosized β-precipitates that are known to enhance the superelastic properties in FeMnAlNi-based SMAs. The precipitates have been analyzed using transmission electron microscopy measurements. To further evaluate their influence on the superelastic properties of the Fe<sub>41</sub>Mn<sub>34.2</sub>Al<sub>14.1</sub>Ni<sub>7.7</sub>Cr<sub>3</sub> (at.-%) SMA, compressive incremental strain tests were carried out, revealing significantly improved recoverable compressive strains after the β-precipitates slightly coarsened<i>. In situ </i> optical microscopy was conducted during the mechanical tests, showing irrecoverable martensite in a not aged condition, rationalizing its inferior superelastic performance. Furthermore, by affecting the substructures, it becomes possible to tailor the superelastic properties of FeMnAlNi-based SMAs for different applications.</p>

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Tailoring Micro- and Nanostructures to Optimize the Functional Response of FeMnAlNi-Based Shape Memory Alloys

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年8月4日

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  • Carolin Knab,
  • Johanna-Maria Frenck,
  • Dominik Janoschka,
  • Wenwen Song,
  • Thomas Niendorf

摘要

The present paper focuses on the evolution of micro- and nanostructures during a cyclic heat treatment in a Fe41Mn34.2Al14.1Ni7.7Cr3 (at.-%) shape memory alloy (SMA). Crystallographic orientation and subgrain structures of the obtained single crystal after a cyclic heat treatment have been investigated using optical microscopy and electron backscatter diffraction analysis. Subsequent to the cyclic heat treatment, an aging process (200 °C, 3 h) has been applied to introduce nanosized β-precipitates that are known to enhance the superelastic properties in FeMnAlNi-based SMAs. The precipitates have been analyzed using transmission electron microscopy measurements. To further evaluate their influence on the superelastic properties of the Fe41Mn34.2Al14.1Ni7.7Cr3 (at.-%) SMA, compressive incremental strain tests were carried out, revealing significantly improved recoverable compressive strains after the β-precipitates slightly coarsened. In situ optical microscopy was conducted during the mechanical tests, showing irrecoverable martensite in a not aged condition, rationalizing its inferior superelastic performance. Furthermore, by affecting the substructures, it becomes possible to tailor the superelastic properties of FeMnAlNi-based SMAs for different applications.