|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Recent Developments in Biological, Structural and Functional Thin Films & Coatings
||Exploring the Thermal and Mechanical Stability of Amorphous and Nanocrystalline Tantalum Films
||Khalid Hattar, Olivia Donaldson, Kathryn Small, Jason Trelewicz
|On-Site Speaker (Planned)
Refractory metals have found many applications in advanced aerospace, defense, nuclear energy, and high-speed transportation applications due to their mechanical stability at elevated temperatures. This presentation will detail the production of both amorphous and nanocrystalline tantalum thin films via pulsed laser deposition. This will be followed by direct observation of both films during in-situ TEM annealing. The amorphous films went through complex series of phase transitions breaking down around 1100 °C. In contrast, the nanocrystalline films maintained a nanocrystalline structure up to 1200 °C, which we have attributed to trace oxygen at the grain boundaries. In-situ TEM straining experiments on both microstructures was dominated by brittle fracture mechanisms.
||Planned: Supplemental Proceedings volume