Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5466018 | Thin Solid Films | 2017 | 33 Pages |
Abstract
We have explored the high entropy alloy (HEA) concept in the AlTiVNbCr-nitride material system. (AlTiVNbCr)N coatings synthesized by reactive cathodic arc deposition are close to an ideal cubic solid solution with a positive mean-field enthalpy of mixing of 0.06 eV/atom. First principle calculations show a higher thermodynamic stability for the solid solution relative to their binaries thereby indicating a possible entropy stabilization at a temperature above 727 °C. However, the elevated temperature annealing experiments show that the solid solution decomposes to w-AlN and c-(TiVNbCr)N. The limited thermal stability of the solid solution is investigated in relation to several thermodynamic parameters. We suggest that the HEA designed multiprincipal element (AlTiVNbCr)N solid solutions are in a metastable state.
Related Topics
Physical Sciences and Engineering
Materials Science
Nanotechnology
Authors
K. Yalamanchili, F. Wang, I.C. Schramm, J.M. Andersson, M.P. Johansson Jöesaar, F. Tasnádi, F. Mücklich, N. Ghafoor, M. Odén,