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<p>In this work, the effect of plastic deformation on the reversibility of the martensitic transformation in Ni–Mn–V–In shape memory alloys with biphasic microstructures was studied. An alloy series Ni<sub>X</sub>Mn<sub>83-X</sub>V<sub>10</sub>In<sub>7</sub> (47 ≤ X ≤ 53) was synthesized, and the Ni<sub>51</sub>Mn<sub>32</sub>V<sub>10</sub>In<sub>7</sub> and Ni<sub>52</sub>Mn<sub>31</sub>V<sub>10</sub>In<sub>7</sub> alloys were selected for thermal, structural, and mechanical characterization. X-ray diffraction analysis revealed the coexistence of L2<sub>1</sub> and a secondary FCC phase, with an increasing fraction of the latter as the nickel content increased. Constant-temperature mechanical tests showed a non-superelastic response, attributed to plastic deformation induced in the secondary phase. Differential scanning calorimetry (DSC) curves evidenced partial recovery of the martensitic transformation after unloading, with reductions in transformation enthalpy of up to 32%. Furthermore, optical micrographs confirmed the presence of retained martensite above A<sub>F</sub>. This behavior suggests that plastic deformation of the secondary phase generates internal stresses that stabilize the martensite in the active phase above the A<sub>F</sub> temperature.</p> Graphic Abstract <p></p>

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Inhibition of martensitic transformation in Ni–Mn–V–In shape memory alloys by plastic deformation in a secondary phase

  • 期刊论文

  • 发表日期：

    2026年1月20日

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  • L. A. Ascencio de la Cruz,
  • H. Flores-Zúñiga,
  • P. Álvarez-Alonso,
  • J. López-García,
  • F. Alvarado-Hernández,
  • J. P. Camarillo-Garcia

摘要

In this work, the effect of plastic deformation on the reversibility of the martensitic transformation in Ni–Mn–V–In shape memory alloys with biphasic microstructures was studied. An alloy series NiXMn83-XV10In7 (47 ≤ X ≤ 53) was synthesized, and the Ni51Mn32V10In7 and Ni52Mn31V10In7 alloys were selected for thermal, structural, and mechanical characterization. X-ray diffraction analysis revealed the coexistence of L21 and a secondary FCC phase, with an increasing fraction of the latter as the nickel content increased. Constant-temperature mechanical tests showed a non-superelastic response, attributed to plastic deformation induced in the secondary phase. Differential scanning calorimetry (DSC) curves evidenced partial recovery of the martensitic transformation after unloading, with reductions in transformation enthalpy of up to 32%. Furthermore, optical micrographs confirmed the presence of retained martensite above AF. This behavior suggests that plastic deformation of the secondary phase generates internal stresses that stabilize the martensite in the active phase above the AF temperature.

Graphic Abstract