About this Abstract |
| Meeting |
2027 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Surface Engineering IX
|
| Presentation Title |
Microstructural Evolution and Phase Stability of HVOF-Sprayed Al–Cr–Co–Mn–Zr Quasicrystal-Reinforced Coatings |
| Author(s) |
Sarshad Rommel, Baris Yavas, Callie Benson, Eric Jordan, Chen Jiang, Mark Aindow |
| On-Site Speaker (Planned) |
Sarshad Rommel |
| Abstract Scope |
Al-Cr-Mn-Co-Zr alloy powders with composite microstructures comprising an FCC Al matrix and dispersed quasicrystalline icosahedral-phase (I-phase) particles are being explored as feedstock for wear- and corrosion-resistant thermal spray coatings for aerospace applications. The metastable nature of the I-phase makes it essential to understand its stability during coating deposition and subsequent thermal exposure. In this work, we report the microstructure, phase constitution and thermal decomposition behavior of coatings deposited by high-velocity oxy-fuel (HVOF) thermal spray using Al-Cr-Mn-Co-Zr powders. Depending on the spray parameters, the coatings exhibit microstructures ranging from supersaturated solid solutions to composite microstructures that resemble those of the feedstock powder. Phase stability was evaluated through ex-situ heat treatments to assess the evolution of the metastable I-phase. Particular emphasis is placed on identifying processing conditions that maximize particle entrainment to minimize unmelted particles responsible for undesirable microstructural heterogeneity. These findings provide guidance for the development of quasicrystal-reinforced thermal spray coatings. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Aluminum, Surface Modification and Coatings, |