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

Research output: Contribution to journalArticle

Abstract

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
Volume10
Issue number1
DOIs
Publication statusPublished - 2020 Dec 1

ASJC Scopus subject areas

  • General

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    Chen, Y. T., Chang, Y. J., Murakami, H., Sasaki, T., Hono, K., Li, C. W., Kakehi, K., Yeh, J. W., & Yeh, A. C. (2020). Hierarchical microstructure strengthening in a single crystal high entropy superalloy. Scientific reports, 10(1), [12163]. https://doi.org/10.1038/s41598-020-69257-8