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<p>This study investigates the effects of thermal aging on the crystallographic texture, dislocation density, and tensile behavior of a novel high entropy alloy (HEA) with the composition Al<sub>2</sub>Fe<sub>53</sub>Ni<sub>35</sub>Cu<sub>5</sub>Ti<sub>5</sub> (at.%). Using a combination of X-ray diffraction (XRD) and high-resolution electron backscatter diffraction (HR-EBSD), three different heat-treated configurations (ConFig 1: water-quenched; ConFig 2: aged 3&#xa0;h at 530&#xa0;°C; ConFig 3: aged 10&#xa0;h at 530&#xa0;°C) were characterized to correlate microstructural evolution with mechanical performance. The alloy displayed a primarily FCC structure across all treatments, with progressive formation of Ni₃Ti (HCP) and AlNi₃ (L1<sub>2</sub>) precipitates during aging. Lattice distortion, initially severe in the as-cast state, reduced significantly with aging, as reflected in the transition toward near-cubic symmetry. Dislocation density followed a nonlinear trend, decreasing in ConFig. 2 due to recovery but rising in ConFig. 3 with the formation of a secondary phase. Texture analysis revealed a dominant {001} &lt; 100 &gt; component in early stages, shifting toward a pronounced Goss ({110} &lt; 001 &gt;) orientation with prolonged aging. Correspondingly, tensile testing showed an increasing yield and ultimate tensile strength from 250/334&#xa0;MPa in ConFig 1 to &#xa0;400&#xa0;MPa/465&#xa0;MPa in ConFig 3, accompanied by a drop in elongation from 55% to 28%. These findings highlight the critical role of precipitation and texture evolution in tuning the strength–ductility balance of HEAs through controlled thermal processing.</p>

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Influence of thermal aging on precipitation, texture evolution, and mechanical properties in Al₂Fe₅₃Ni₃₅Cu₅Ti₅ complex concentrated alloy

  • 期刊论文

  • 发表日期：

    2025年11月12日

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  • Fatemeh Asadi,
  • Mohammad Masoumi,
  • Marcelo Paredes

摘要

This study investigates the effects of thermal aging on the crystallographic texture, dislocation density, and tensile behavior of a novel high entropy alloy (HEA) with the composition Al2Fe53Ni35Cu5Ti5 (at.%). Using a combination of X-ray diffraction (XRD) and high-resolution electron backscatter diffraction (HR-EBSD), three different heat-treated configurations (ConFig 1: water-quenched; ConFig 2: aged 3 h at 530 °C; ConFig 3: aged 10 h at 530 °C) were characterized to correlate microstructural evolution with mechanical performance. The alloy displayed a primarily FCC structure across all treatments, with progressive formation of Ni₃Ti (HCP) and AlNi₃ (L12) precipitates during aging. Lattice distortion, initially severe in the as-cast state, reduced significantly with aging, as reflected in the transition toward near-cubic symmetry. Dislocation density followed a nonlinear trend, decreasing in ConFig. 2 due to recovery but rising in ConFig. 3 with the formation of a secondary phase. Texture analysis revealed a dominant {001} < 100 > component in early stages, shifting toward a pronounced Goss ({110} < 001 >) orientation with prolonged aging. Correspondingly, tensile testing showed an increasing yield and ultimate tensile strength from 250/334 MPa in ConFig 1 to  400 MPa/465 MPa in ConFig 3, accompanied by a drop in elongation from 55% to 28%. These findings highlight the critical role of precipitation and texture evolution in tuning the strength–ductility balance of HEAs through controlled thermal processing.