Journal of the Korean Society for Heat Treatment (열처리공학회지)

The Korean Society for Heat Treatment (한국열처리공학회)
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Effect of Annealing Temperature on the Microstructure and Mechanical Properties of CoCrFeMnNi High Entropy Alloy

CoCrFeMnNi 고엔트로피 합금에서 어닐링 온도가 미세조직 및 기계적 특성에 미치는 영향

  • Junseok Lee (Department of Metallurgical Engineering, Pukyong National University) ;
  • Tae Hyeong Kim (Department of Metallurgical Engineering, Pukyong National University) ;
  • Jae Wung Bae (Department of Metallurgical Engineering, Pukyong National University)
  • 이준석 (부경대학교 융합소재공학부 금속공학전공) ;
  • 김태형 (부경대학교 융합소재공학부 금속공학전공) ;
  • 배재웅 (부경대학교 융합소재공학부 금속공학전공)
  • Received : 2024.01.26
  • Accepted : 2024.02.24
  • Published : 2024.03.30
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Abstract

In the present study, the effect of annealing condition on the microstructures and mechanical properties of the cold-rolled CoCrFeMnNi high entropy alloys were studied. Annealing treatment was performed under six different temperatures. Microstructural analyses confirmed that annealing below 800℃ resulted in the formation of intermetallic sigma (σ) phase within face-centered cubic (FCC) matrix, and this σ phase has beneficial effects on the formation of fine-grained structures through retardation of grain growth and recrystallization due to Zener pinning effect. This led to the enhanced yield strength and tensile strength of ~646 and ~855 MPa, respectively. The microstructures annealed above 800℃ demonstrated single FCC phase, and fully-recrystallized single FCC microstructure resulted in a slight increase in ductility with a considerable decrease in strength. The evolution of mechanical properties, such as strength, ductility, and strain hardening exponent, will be discussed.

Keywords

Acknowledgement

This work was supported by a Research Grant of Pukyong National University (2022).

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