Hierarchical microstructure strengthening in a single crystal high entropy superalloy

Yung Ta Chen, Yao Jen Chang, Hideyuki Murakami, Taisuke Sasaki, Kazuhiro Hono, Chen Wei Li, Koji Kakehi, Jien Wei Yeh, An Chou Yeh*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)


A hierarchical microstructure strengthened high entropy superalloy (HESA) with superior cost specific yield strength from room temperature up to 1,023 K is presented. By phase transformation pathway through metastability, HESA possesses a hierarchical microstructure containing a dispersion of nano size disordered FCC particles inside ordered L12 precipitates that are within the FCC matrix. The average tensile yield strength of HESA from room temperature to 1,023 K could be 120 MPa higher than that of advanced single crystal superalloy, while HESA could still exhibit an elongation greater than 20%. Furthermore, the cost specific yield strength of HESA can be 8 times that of some superalloys. A template for lighter, stronger, cheaper, and more ductile high temperature alloy is proposed.

Original languageEnglish
Article number12163
JournalScientific reports
Issue number1
Publication statusPublished - 2020 Dec 1

ASJC Scopus subject areas

  • General


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