About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Materials Deposition by Cold Spray and Related Technologies III
|
| Presentation Title |
High Temperature Nanoindentation and Microstructural Annealing of Cold Sprayed CoCrFeNiMo0.5 High Entropy Alloy Coating. |
| Author(s) |
Emmanuel Omosegunfunmi Aikulola, Caleb Michael Schenck, Michael Paul Lastovich, Ashok Meghwal, Christopher Berndt, Andrew Siao Ming Ang, Bharat Gwalani |
| On-Site Speaker (Planned) |
Emmanuel Omosegunfunmi Aikulola |
| Abstract Scope |
Cold-spray is a promising deposition method for high-entropy alloys (HEA) because it maintains alloy homogeneity and properties by reducing segregation and undesired precipitate formation. These coatings provide surface protection with exceptional bonding strength, enhancing the mechanical performance of industrial parts in extreme environments. In this study, the hardness and microstructural evolution of a cold-spray deposited CoCrFeNiMo0.5 HEA-coating on Cu-substrate was investigated via in-situ annealing at 25, 300, 600 and 800°C. The coating initial microstructure was composed of cellular dendritic FeNiCo-rich FCC phases, surrounded by extracellular Mo-rich µ and Cr-rich σ-intermetallic phases. These hard phases contributed to the high average-hardness of 6.42GPa at room temperature. However, annealing temperatures increase resulted in average-hardness reduction due to the combined influences of thermal softening, dislocation rearrangement and phase transformations. The impact of thermal softening vs recovery, recrystallization, and grain growth was decoupled using in-situ and post annealing hardness testing and microstructural characterization. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, Surface Modification and Coatings, High-Temperature Materials |