| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Continuous Phase Transformations
|
| Presentation Title |
Intrinsic Phase Stability and Continuous Phase Transformations in TiAlZrN Ultra-hard Nitride Coatings |
| Author(s) |
Vahid Attari, Raymundo Arroyave |
| On-Site Speaker (Planned) |
Vahid Attari |
| Abstract Scope |
Transition metal nitrides (TMNs) are generally characterized with high hardness, oxidation resistance, and relatively high melting points. Among many TMNs, we study Ti$_{1-x-y}$Al$_x$Zr$_y$N alloys which are inherently unstable for a wide range of composition and temperature and transform continuously into base cubic nitride compounds i.e. AlN, TiN, and ZrN. Also, during later stages of evolution, the c-AlN transforms to w-AlN. This transition is associated with strain localization in the form of the lattice misfit between wurtzite and rock salt phases. We have developed a phase-field model to study the nanostructure of these metastable TMNs under elasto-chemical conditions and we have further looked at the inertial roots of the AlN cubic to wurtzite transition at strain space. Results will be Presented (i) on the elasto-chemical interactions in the nanostructure, and (ii) on the tendency of the cubic to wurtzite transition in composition space along with experimental data where possible. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Computational Materials Science & Engineering, Surface Modification and Coatings, Phase Transformations |