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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


Cluster Variation Model of Phase Behavior in Heusler-forming Alloy Systems
Competitive Partitioning and Decomposition Evolution in Nanocrystalline Alloys
Cross-Slip and Work-Hardening in Short-Range Ordered FCC Alloys
Effect of Bulk and Local Phase Transformation on Deformation Mechanisms
Interfacial Spinodals
Intrinsic Phase Stability and Continuous Phase Transformations in TiAlZrN Ultra-hard Nitride Coatings
Magnetically Driven Short-range Order in the CrCoNi System
Microstructural Engineering of Ni-based Superalloys Processed by Conventional and Additive Manufacturing
Phase-field Modelling of Transformation Pathways and Microstructural Evolution in MPEAs (Multi Principle Element Alloys)
Phase Competition in the Two Steps Continuous Phase Transformation during Solidification of Terbium
Short-range Clustering and Ordering Evolution of Ni-22Cr-13Mo Alloy
Structural Transformations Driven by Irradiation in the High Defect Density Limit
Study of Precipitation Behavior of High-Cr Ni-based Filler Metals Using In-situ S/TEM
Thermodynamics of the Invar Transition: Phonons vs. Magnetism

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