Designing high entropy superalloys for elevated temperature application

Yung-Ta Chen (1, 2) , Yao-Jen Chang (1, 3) , Hideyuki Murakami (2, 4) , Stéphane Gorsse (5, 1) , An-Chou Yeh (1, 3)

1 Department of Materials Science and Engineering
2 NIMS - National Institute for Materials Science
3 High Entropy Materials Center
4 Department of Nanoscience and Nanoengineering
5 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux

In the context of cast alloy development for high temperature applications, high entropy superalloys (HESA) have exhibited superior cost specific tensile strength than that of superalloys such as CM247LC. Compositions of HESA are distinctively different from those of cast superalloys with higher contents of Fe and Ti, making HESA cheaper and lighter. Comparing to superalloys, although HESA has adopted the template of FCC-structured (γ) matrix and coherent L12-structured (γ′) precipitates, γ′ is enriched with solutes with higher intrinsic strength, rendering positive lattice misfit, and the high entropy γ matrix may have attributed to a good combination of strength and ductility.

Domaines: Matériaux

Yung-Ta Chen, Yao-Jen Chang, Hideyuki Murakami, Stéphane Gorsse, An-Chou Yeh. Designing high entropy superalloys for elevated temperature application. Scripta Materialia, 2020, 187, pp.177-182. ⟨10.1016/j.scriptamat.2020.06.002⟩. ⟨hal-02886263⟩