열처리공학회지 (Journal of the Korean Society for Heat Treatment)

  • 제36권3호
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  • Pages.128-136
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  • 2023
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  • 1225-1070(pISSN)
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  • 2508-4046(eISSN)
한국열처리공학회 (The Korean Society for Heat Treatment)
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나노결정립 CoCrFeMnNi 고엔트로피합금의 열처리에 따른 이차상 형성 및 나노압입 크리프 거동 변화 연구

Effects of Heat Treatment on Secondary Phase Formation and Nanoindentation Creep Behavior of Nanocrystalline CoCrFeMnNi High-entropy alloy

  • 이동현 (충남대학교 신소재공학과) ;
  • 장재일 (한양대학교 신소재공학과)
  • Dong-Hyun Lee (Department of Materials Science and Engineering, Chungnam National University) ;
  • Jae-il Jang (Division of Materials Science and Engineering, Hanyang University)
  • 투고 : 2023.05.09
  • 심사 : 2023.05.25
  • 발행 : 2023.05.30
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초록

In this study, the effects of heat treatment on the nano-scale creep behavior of CoCrFeMnNi high-entropy alloy (HEA) processed by high-pressure torsion (HPT) was investigated through nanoindentation technique. Nanoindentation experiments with a Berkovich indenter were performed on HPT-processed alloy subjected to heat treatment at 450℃, revealing that the hardness of the HPT-processed alloy (HPT sample) significantly increased with the heat treatment time. The heat treatment-induced microstructural change in HPT-processed alloy was analyzed using transmission electron microscopy, which showed the nano-sized Cr-, NiMn-, and FeCo-rich phases were formed in the HPT-processed alloy subjected to 10 hours of heat treatment (HPT+10A sample). To compare the creep behavior of HPT and HPT+10A samples, constant load nanoindentation creep experiments were performed using spherical indentation indenters with two different radii. It was revealed that the predominant mechanism for creep highly depended on the applied stress level. At low stress level, both HPT and HPT+10A samples were dominated by Coble creep. At high stress level, however, the mechanism transformed to dislocation creep for HPT sample, but continued to be Coble creep for HPT+10A sample, leading to higher creep resistance in the HPT+10A sample.

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과제정보

이 연구는 2023년도 정부(과학기술정보통신부)의 재원으로 한국연구재단의 지원을 받아 수행된 연구(NRF-2021R1F1A1048393)입니다.

참고문헌

  1. Y. Zhang, T. T. Zuo, Z. Tang, M. C. Gao, K. A. Dahmen, P. K. Liaw, and Z. P. Lu : Prog. Mater. Sci. 61 (2014) 1.
  2. D. B. Miracle and O. N. Senkov : Acta Mater. 122 (2017) 448.
  3. F. Otto, A. Dlouhy, C. Somsen, H. Bei, G. Eggeler, and E. P. George : Acta Mater. 61 (2013) 5743.
  4. B. Gludovatz, A. Hohenwarter, D. Catoor, E. H. Chang, E. P. George, and R. O. Ritchie : Science 345 (2014) 1153.
  5. R. Z. Valiev and T. G. Langdon : Prog. Mater. Sci. 51 (2006) 881.
  6. A. P. Zhilyaev and T. G. Langdon : Prog. Mater. Sci. and (2008) 893.
  7. D. -H. Lee, I. -C. Chi, M. -Y. Seok, J. He, Z. Lu, J. -Y. Suh, M. Kawasaki, T. G. Langdon, and J. -i. Jang : J. Mater. Res. 30 (2015) 2804.
  8. B. Schuh, F. M. Martin, B. Volker, E. P. George, H. Clemens, R. Pippan, and A. Hohenwarter : Acta Mater. 96 (2015) 258.
  9. D. -H. Lee, M. -Y. Seok, Y. Zhao, I. -C. Choi, J. He, Z. Lu, J. -Y. Suh, U. Ramamurty, M. Kawasaki, T. G. Langdon, and J. -i. Jang : Acta Mater. 109 (2016) 314.
  10. E. J. Pickering, R. Munoz-Moreno, H. J. Stone, and N. G. Jones : Scr. Mater. 113 (2016) 106.
  11. F. Otto, A. Dlouhy, K. G. Pradeep, M. Kubenov a, D. Raabe, G. Eggeler, and E. P. George : Acta Mater. 112 (2016) 40.
  12. N. Park, B. -J. Lee, and N. Tsuji : J. Alloys. Compd. 719 (2017) 189.
  13. D. -H. Lee, J. -A Lee, Y. Zhao, Z. Lu, J. -Y. Suh, J. - Y. Kim, U. Ramamurty, M. Kawasaki, T. G. Langdon, and J. -i. Jang : Acta Mater., 140 (2017) 443.
  14. I. -C. Choi, B. -G. Yoo, Y. -J. Kim, and J.-i. Jang : J. Mater. Res. 27 (2012) 3.
  15. K. L. Johnson : Contact Mechanics, Cambridge University Press, Cambridge, 1985
  16. W. C. Oliver, and G. M. Pharr : J. Mater. Res. 7 (1992) 1564.
  17. I. -C. Choi, B. -G. Yoo, Y. -J. Kim, M. -Y. Seok, Y. M. Wang, and J. -i. Jang : Scr. Mater 65 (2011) 300.
  18. F. Garofalo : Fundamentals of Creep and Creep-Rupture in Metals, (Macmillan, New York, USA, 1965.
  19. G. E. Dieter : Mechanical Metallurgy (McGraw-Hill, London, 1988).
  20. M. E. Kassner and M. T. Perez-Prado : Fundamentals of Creep in Metals and Alloys (Elsevier, Oxford, 2004).
  21. J. G. Swadener, E. P. George, and G. M. Pharr : J. Mech. Phys. Solids 50 (2002) 681.
  22. Z. B. Wang, K. Lu, G. Wilde, and S. V. Divins ki : Acta Mater 58 (2010) 2376.
  23. S. V. Divinski, G. Reglitz, H. Rosner, Y. Estrin, and G. Wilde : Acta Mater 59 (2011) 1947.
  24. X. Sauvage, G. Wilde, S. V. Divinski, Z. Horita, and R. Z. Valiev : Mater. Sci. Eng. A 540 (2012) 1.
  25. R. J. McCabe and M. E. Fine : Metall. Mater. Trans. A, 33 (2002) 575.