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<p>The microstructure and mechanical properties of an equiatomic FeCoCrNi high-entropy alloy were examined in as-solidified state and after annealing in current study. XRD results exhibited the existence of a single FCC phase. Microstructural observations indicated that the as-solidified alloy has a typical cast dendritic structure, where interdendritic regions were indicated the fiber texture component with ND // &lt; 100 &gt; orientations. The results indicated that the as-solidified alloy had ultimate strength of 451 MPa and ductility of 75%. An increase in tensile strength and a drop in ductility occurred within the temperature range of 600 and 800 °C due to dendritic segregations and lattice stresses. The hardness increased at temperatures between 600 and 800&#xa0;°C, and then, softening occurred along with a strength decrease due to grain growth. In addition, annealing at temperature of 800&#xa0;°C for 6 h exhibited a shift from a ductile behavior to a partially brittle one.</p>

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Influence of Annealing Treatment on the Microstructure and Tensile Properties of an As-Cast FeCoCrNi High-Entropy Alloy System

  • 期刊论文

  • 发表日期：

    2026年7月14日

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  • Seyyed Ali Sajadi,
  • Mohammad Reza Toroghinejad

摘要

The microstructure and mechanical properties of an equiatomic FeCoCrNi high-entropy alloy were examined in as-solidified state and after annealing in current study. XRD results exhibited the existence of a single FCC phase. Microstructural observations indicated that the as-solidified alloy has a typical cast dendritic structure, where interdendritic regions were indicated the fiber texture component with ND // < 100 > orientations. The results indicated that the as-solidified alloy had ultimate strength of 451 MPa and ductility of 75%. An increase in tensile strength and a drop in ductility occurred within the temperature range of 600 and 800 °C due to dendritic segregations and lattice stresses. The hardness increased at temperatures between 600 and 800 °C, and then, softening occurred along with a strength decrease due to grain growth. In addition, annealing at temperature of 800 °C for 6 h exhibited a shift from a ductile behavior to a partially brittle one.