1. Hierarchical microstructure strengthening in a single crystal high entropy superalloy
- Author
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An-Chou Yeh, Koji Kakehi, Chen Wei Li, Jien-Wei Yeh, Yung Ta Chen, Kazuhiro Hono, Yao-Jen Chang, Taisuke Sasaki, and Hideyuki Murakami
- Subjects
Materials science ,Alloy ,lcsh:Medicine ,Mechanical properties ,02 engineering and technology ,engineering.material ,01 natural sciences ,Article ,Metastability ,Phase (matter) ,0103 physical sciences ,Ultimate tensile strength ,Composite material ,lcsh:Science ,010302 applied physics ,Multidisciplinary ,lcsh:R ,Metals and alloys ,021001 nanoscience & nanotechnology ,Microstructure ,Superalloy ,engineering ,lcsh:Q ,0210 nano-technology ,Dispersion (chemistry) ,Single crystal - 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.
- Published
- 2020
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