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<p>The effect of long-term aging on the microstructure and mechanical behavior of Al<sub>0.2</sub>CoCrFeNiMo<sub>0.5</sub> HEA was studied. The alloy was prepared through vacuum induction melting and processed via thermomechanical route, with the final stage of cold rolling to 80% reduction in the thickness. The cold rolled samples were annealed at 1000&#xa0;°C for different time intervals ranging from 1 to 60&#xa0;h. The evolution of the resultant microstructure is studied using FE-SEM, TEM and EBSD, and the mechanical properties are evaluated using tensile and hardness tests. The microstructure revealed the coarsening of precipitates and grain growth with the increase in the annealing time from 1 to 60&#xa0;h. A minimum drop in the hardness by ~ 40&#xa0;HV from 323&#xa0;HV at 1&#xa0;h to 283&#xa0;HV at 60&#xa0;h, indicated a good microstructural stability at 1000&#xa0;°C. Further, the drop in the tensile tests properties corresponding to the yield strength, ultimate tensile strength, and strain to fracture are from 719, 946&#xa0;MPa, 12.1% at 1&#xa0;h to 574, 742&#xa0;MPa, 8.9% at 60&#xa0;h, respectively. The observed differences in the mechanical properties are correlated with the microstructural features that include precipitate size, morphology, distribution, and matrix grain size. The present material shows good microstructural stability compared to selected high-entropy alloy and conventional material.</p> Graphical Abstract <p></p>

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Effect of Annealing on the Microstructural Stability and Mechanical Properties of Al0.2CoCrFeNiMo0.5 High-Entropy Alloy

  • 期刊论文

  • 发表日期：

    2025年2月24日

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  • Yasam Palguna,
  • Kotla Sairam,
  • Dudala Srinivas,
  • S. Chenna Krishna,
  • Rajesh Korla

摘要

The effect of long-term aging on the microstructure and mechanical behavior of Al0.2CoCrFeNiMo0.5 HEA was studied. The alloy was prepared through vacuum induction melting and processed via thermomechanical route, with the final stage of cold rolling to 80% reduction in the thickness. The cold rolled samples were annealed at 1000 °C for different time intervals ranging from 1 to 60 h. The evolution of the resultant microstructure is studied using FE-SEM, TEM and EBSD, and the mechanical properties are evaluated using tensile and hardness tests. The microstructure revealed the coarsening of precipitates and grain growth with the increase in the annealing time from 1 to 60 h. A minimum drop in the hardness by ~ 40 HV from 323 HV at 1 h to 283 HV at 60 h, indicated a good microstructural stability at 1000 °C. Further, the drop in the tensile tests properties corresponding to the yield strength, ultimate tensile strength, and strain to fracture are from 719, 946 MPa, 12.1% at 1 h to 574, 742 MPa, 8.9% at 60 h, respectively. The observed differences in the mechanical properties are correlated with the microstructural features that include precipitate size, morphology, distribution, and matrix grain size. The present material shows good microstructural stability compared to selected high-entropy alloy and conventional material.

Graphical Abstract