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<p>A non-equiatomic Fe<sub>60</sub>Co<sub>10</sub>Cr<sub>10</sub>Ni<sub>10</sub>Mo<sub>5</sub>V<sub>5</sub> medium-entropy alloy (MEA) is designed and prepared using arc melting and cold rolling, followed by an annealing treatment. The effects of annealing temperature on the microstructure and mechanical properties of the as-prepared alloy are investigated. The results show that this MEA is composed of a face-centered cubic (FCC) matrix and <i>σ</i> phases, which precipitate in the matrix after annealing at 850°C to 1050°C. Increasing the annealing temperature can increase the size of the <i>σ</i> phases but decrease their volume fraction. The fine-grained microstructure of the FCC matrix is possible because of the pinning effect of the <i>σ</i> precipitates. This fine-grained microstructure with <i>σ</i> precipitates can ensure that the MEA has good and uniform tensile strength at room temperature. The contribution to the yield strength increment is also discussed based on the conventional strengthening theory.</p>

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Influence of Annealing Temperature on the Microstructure and Mechanical Properties of a Fe60Co10Cr10Ni10Mo5V5 Medium-Entropy Alloy

  • 期刊论文

  • 发表日期：

    2025年1月29日

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  • Hebin Wang,
  • Jiasheng Ge,
  • Mengran Zhou,
  • Ping Ou,
  • Da Hong,
  • Jiayi Zhang,
  • Jishan Zhang,
  • Cailiu Yin,
  • Olanrewaju A. Ojo

摘要

A non-equiatomic Fe60Co10Cr10Ni10Mo5V5 medium-entropy alloy (MEA) is designed and prepared using arc melting and cold rolling, followed by an annealing treatment. The effects of annealing temperature on the microstructure and mechanical properties of the as-prepared alloy are investigated. The results show that this MEA is composed of a face-centered cubic (FCC) matrix and σ phases, which precipitate in the matrix after annealing at 850°C to 1050°C. Increasing the annealing temperature can increase the size of the σ phases but decrease their volume fraction. The fine-grained microstructure of the FCC matrix is possible because of the pinning effect of the σ precipitates. This fine-grained microstructure with σ precipitates can ensure that the MEA has good and uniform tensile strength at room temperature. The contribution to the yield strength increment is also discussed based on the conventional strengthening theory.