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<p>Fine B2 precipitates are observed to form in an FCC matrix during post-deformation annealing of Al<sub>0.2</sub>CoCrFeNi at 700&#xa0;°C. These pin the grain boundaries, resulting in a very stable microstructure and superior combination of strength and ductility. In contrast, annealing at 900&#xa0;°C produces a single-phase FCC alloy which undergoes rapid grain growth with a Hall–Petch-type reduction in hardness. The grain growth exponent departs from the classical square-root time dependence for both alloys.</p>

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B2 Precipitation in Al0.2CoCrFeNi with Enhanced Microstructural Stability and Mechanical Properties

  • 期刊论文

  • 发表日期：

    2025年7月14日

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  • Ambe Radha,
  • Vivek C. Peddiraju,
  • Rajesh Korla,
  • Subhradeep Chatterjee

摘要

Fine B2 precipitates are observed to form in an FCC matrix during post-deformation annealing of Al0.2CoCrFeNi at 700 °C. These pin the grain boundaries, resulting in a very stable microstructure and superior combination of strength and ductility. In contrast, annealing at 900 °C produces a single-phase FCC alloy which undergoes rapid grain growth with a Hall–Petch-type reduction in hardness. The grain growth exponent departs from the classical square-root time dependence for both alloys.