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Condensed Matter > Materials Science

arXiv:2510.16467 (cond-mat)
[Submitted on 18 Oct 2025]

Title:Vacancy-concentration-dependent thermal stability of fcc-(Ti,Al)Nx predicted via chemical-environment-sensitive diffusion activation energies

Authors:Ganesh Kumar Nayak, David Holec, Jochen M. Schneider
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Abstract:Thermal decomposition of metastable fcc-(Ti,Al)Nx limits the lifetime of coated components. While energetic decomposition aspects can be modelled reliably, the inherent variability of chemical environment-dependent diffusion activation energies remains systematically unexplored. Here, we predict an activation energy range (envelope) for mass transport in varying chemical environments, reflecting the vacancy concentration range fcc-(Ti0.5Al0.5)1-xNx with x = 0.47, 0.5, 0.53. The stoichiometric compound shows maximum thermal stability, consistent with experimental data. Metal vacancies decrease the average migration energy, while metal and nitrogen vacancies reduce barriers via lattice strain relaxation, enhancing mobility. The strong chemical environment dependence challenges conclusions from single-point activation energy data.
Subjects: Materials Science (cond-mat.mtrl-sci)
Cite as: arXiv:2510.16467 [cond-mat.mtrl-sci]
  (or arXiv:2510.16467v1 [cond-mat.mtrl-sci] for this version)
  https://doi.org/10.48550/arXiv.2510.16467

Submission history

From: Ganesh Kumar Nayak Dr. [view email]
[v1] Sat, 18 Oct 2025 12:20:42 UTC (902 KB)
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