Generalized stacking fault energies, ductilities, and twinnabilities of CoCrFeNi-based face-centered cubic high entropy alloys
Effects of Cu, Mn, Al, Ti, Mo on generalized stacking fault energies, Rice-criterion ductilities, and twinabilities of CoCrFeNi-based face-centered cubic high entropy alloys were investigated using density functional theory calculations. The calculated barrier energies and twinnabilities revealed that the addition of Ti or Mo increased the tendency of dislocation glide and deformation twinning, while addition of Mn, Cu and relatively high amount of Al facilitated dislocation gliding and martensitic transformation. Low amount of Al resulted in only dislocation gliding. Furthermore, the addition of Mn and Cu increased the calculated Rice-criterion ductility while other elements decreased it.
M. Beyramali Kivy and M. Asle Zaeem, "Generalized stacking fault energies, ductilities, and twinnabilities of CoCrFeNi-based face-centered cubic high entropy alloys," Scripta Materialia, vol. 139, pp. 83 - 86, Acta Materialia Inc, Oct 2017.
The definitive version is available at https://doi.org/10.1016/j.scriptamat.2017.06.014
Materials Science and Engineering
Keywords and Phrases
Ductility; Generalized stacking fault energy; High entropy alloys; Twinnability
International Standard Serial Number (ISSN)
Article - Journal
© 2017 Acta Materialia Inc, All rights reserved.
01 Oct 2017