High temperature properties of advanced directionally-solidified high entropy superalloys

Te Kang Tsao, An Chou Yeh, Jien Wei Yeh, Mau Sheng Chiou, Chen Ming Kuo, Hideyuki Murakami, Koji Kakehi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

High-Entropy-Superalloys (HESA) with good cost-performance has been proposed. In present work, the high temperature phase stability, oxidation, hot corrosion and mechanical properties of HESA alloys were studied. The microstructure of HESA is composed of stable FCC γ matrix and L12 γ′ precipitates, and both γ and γ′ phases are highly alloyed. This γ/γ′ microstructure can remain stable after long term exposure at inter-mediate to high temperatures. With respect to surface stability, HESAs show high Al and Cr activities to form either protective Al2O3 or Cr2O3 rapidly. With minor additions of refractory elements, the high temperature hardness of HESA can be higher than that of conventional superalloy. HESAs show comparable tensile strength and creep rupture properties comparing to that of commercial superalloys. Furthermore, their densities are below 8.0 g.cm-3, and the cost of raw materials can be 20 % cheaper than that of CM247LC. Therefore, the potential of HESAs for high temperature applications are revealed in present article.

Original languageEnglish
Title of host publicationSUPERALLOYS 2016 - Proceedings of the 13th International Symposium on Superalloys
PublisherMinerals, Metals and Materials Society
Pages1001-1009
Number of pages9
Volume2016-January
ISBN (Electronic)9781118996669
Publication statusPublished - 2016 Jan 1
Externally publishedYes
Event13th International Symposium on Superalloys, SUPERALLOYS 2016 - Seven Springs, United States
Duration: 2016 Sep 112016 Sep 15

Other

Other13th International Symposium on Superalloys, SUPERALLOYS 2016
CountryUnited States
CitySeven Springs
Period16/9/1116/9/15

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Keywords

  • Creep resistance
  • Directional solidification
  • Hardness
  • High entropy superalloys
  • Oxidation

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Tsao, T. K., Yeh, A. C., Yeh, J. W., Chiou, M. S., Kuo, C. M., Murakami, H., & Kakehi, K. (2016). High temperature properties of advanced directionally-solidified high entropy superalloys. In SUPERALLOYS 2016 - Proceedings of the 13th International Symposium on Superalloys (Vol. 2016-January, pp. 1001-1009). Minerals, Metals and Materials Society.