Hierarchical microstructure strengthening in a single crystal high entropy superalloy

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 s...

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Published inScientific reports Vol. 10; no. 1; p. 12163
Main Authors Chen, Yung-Ta, Chang, Yao-Jen, Murakami, Hideyuki, Sasaki, Taisuke, Hono, Kazuhiro, Li, Chen-Wei, Kakehi, Koji, Yeh, Jien-Wei, Yeh, An-Chou
Format Journal Article
LanguageEnglish
Published London Nature Publishing Group UK 22.07.2020
Nature Publishing Group
Subjects
639/301/1023/1026
639/301/1023/303
Entropy
High temperature
Humanities and Social Sciences
multidisciplinary
Science
Science (multidisciplinary)
Single crystals
Yield stress
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Summary: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 L1 2 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.
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ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-020-69257-8