|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Ultrafine-grained and Heterostructured Materials (UFGH XII)
||Synergistic Thermal and Radiation Stability in Grain Boundary Doped Nanocrystalline Tungsten
||William Cunningham, Khalid Hattar, Yuanyuan Zhu, Danny Edwards, Jason Trelewicz
|On-Site Speaker (Planned)
Targeted doping of grain boundaries has a profound impact on thermal stability, but for nanocrystalline alloys to be advanced as radiation resistant materials, an understanding of its influence on damage tolerance and stability is needed. In this presentation, results from in situ heavy ion irradiation of a titanium doped nanocrystalline tungsten alloy are discussed with a focus on the coupling between defect accumulation and microstructural evolution. Relative to undoped tungsten, the alloy is shown to exhibit smaller defect loops and a delayed saturation dose, which is accompanied by a transient period of irradiation induced grain growth. Despite this modest coarsening, the grain structure remains decidedly nanocrystalline and plateaus at a much finer grain size than predicted for pure tungsten from a thermal spike grain growth model. Our results thus demonstrate that deliberate doping for enhanced thermal stability synergistically stabilizes the material against irradiation induced coarsening while limiting overall damage accumulation.
||Nuclear Materials, High-Temperature Materials, Characterization