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, H. Murakami, Koji Kakehi

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

2 Citations (Scopus)


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
EditorsMark Hardy, Eric Huron, Uwe Glatzel, Brian Griffin, Beth Lewis, Cathie Rae, Venkat Seetharaman, Sammy Tin
PublisherMinerals, Metals and Materials Society
Number of pages9
ISBN (Electronic)9781118996669
Publication statusPublished - 2016
Externally publishedYes
Event13th International Symposium on Superalloys, SUPERALLOYS 2016 - Seven Springs, United States
Duration: 2016 Sept 112016 Sept 15

Publication series

NameProceedings of the International Symposium on Superalloys


Other13th International Symposium on Superalloys, SUPERALLOYS 2016
Country/TerritoryUnited States
CitySeven Springs


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

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics


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