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Exploring the alloying effects on generalized stacking fault energy and ideal strength of Ni and Ni3Al phases in Ni-based superalloys.
- Source :
-
Mechanics of Materials . Feb2022, Vol. 165, pN.PAG-N.PAG. 1p. - Publication Year :
- 2022
-
Abstract
- To clarify the different effects of alloying elements on the strength of Ni and Ni 3 Al, this study employs First-principles methods to investigate the effects of refractory elements Re, Ru, Ta, Mo and W on the generalized stacking fault energy and ideal strength of Ni and Ni 3 Al, respectively. The results reveal that the alloying elements Re, Ru, Ta, Mo, and W can help to improve the creep strength of Ni but reduce that of Ni 3 Al. Among these alloying elements, Re and Ru are more helpful for improving the strength of Ni, and for Ni 3 Al, Ru has the weakest enhancing effect on the strength of Ni 3 Al. Moreover, except for Ru, other alloying elements have more significant enhancing effects on the strength of Ni 3 Al. The electronic structure analysis shows that the d orbitals of alloying elements except Ru can form deep and wide pseudogap near the Fermi energy level, which causes the obvious enhancement of the strength of Ni 3 Al. Furthermore, the regular areas of charge distribution between atom Ru and its nearest neighbor atoms Ni are more vulnerable to be destroyed, resulting in Ni 3 Al–Ru owning a relatively lower ideal tensile strength and reaches its ideal tensile strength under a smaller strain. • Re, Ru, Ta, Mo and W can help to improve the creep strength of Ni, but reduce that of Ni 3 Al. • Re, W, Mo, and Ta have more significant enhancing effects on the mechanical strength of Ni 3 Al, compare with that of Ni. • The d orbitals of Ru cannot form deep and wide pseudogap near the Fermi energy level, as other elements do. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 01676636
- Volume :
- 165
- Database :
- Academic Search Index
- Journal :
- Mechanics of Materials
- Publication Type :
- Academic Journal
- Accession number :
- 154820366
- Full Text :
- https://doi.org/10.1016/j.mechmat.2021.104183