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<p>The development of compositionally complex alloys (CCAs) attracted several researchers to design materials for structural and high-temperature applications. The CCAs based on the Cantor system possess low strength in as-cast conditions limiting their industrial applications. Therefore, this work focuses on enhancing the strength of the newly designed CCA viz. Ni<sub>46.8</sub>Fe<sub>23</sub>Co<sub>10</sub>V<sub>7</sub>(Al, Si)<sub>6.6</sub> by the evolution of the secondary phase through the heat treatment process. The heat-treated specimens were subjected to Vickers hardness and tensile testing to observe the effect of microstructural evolution on mechanical properties. Furthermore, microstructural characterization was conducted through x-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), and optical microscopy. The peak-aged specimens showed a remarkable improvement of  ~ 35% in yield strength in comparison with solutionized specimens. Moreover, XRD diffractogram and FE-SEM/EDS images revealed the presence Al-Si-rich ordered L1<sub>2</sub> phase in an aged specimen which enhances the tensile strength of the aged specimen. Furthermore, σ-phase was absent in peaks observed in the XRD diffractogram which could be due to the high valence electron concentration value. Moreover, the enhancement in strength observed in aged specimens due to phase transformation opens new avenues in developing CCA for industrial applications.</p>

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Precipitation-Induced Strength-Ductility Synergy in Ni-Based Compositionally Complex Alloy during Static Aging

  • 期刊论文

  • 发表日期：

    2025年5月12日

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  • Ananya Chattree,
  • Amrit Pandey,
  • Saurabh S. Nene,
  • Jaiveer Singh

摘要

The development of compositionally complex alloys (CCAs) attracted several researchers to design materials for structural and high-temperature applications. The CCAs based on the Cantor system possess low strength in as-cast conditions limiting their industrial applications. Therefore, this work focuses on enhancing the strength of the newly designed CCA viz. Ni46.8Fe23Co10V7(Al, Si)6.6 by the evolution of the secondary phase through the heat treatment process. The heat-treated specimens were subjected to Vickers hardness and tensile testing to observe the effect of microstructural evolution on mechanical properties. Furthermore, microstructural characterization was conducted through x-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), and optical microscopy. The peak-aged specimens showed a remarkable improvement of  ~ 35% in yield strength in comparison with solutionized specimens. Moreover, XRD diffractogram and FE-SEM/EDS images revealed the presence Al-Si-rich ordered L12 phase in an aged specimen which enhances the tensile strength of the aged specimen. Furthermore, σ-phase was absent in peaks observed in the XRD diffractogram which could be due to the high valence electron concentration value. Moreover, the enhancement in strength observed in aged specimens due to phase transformation opens new avenues in developing CCA for industrial applications.