|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Thermo-mechanical Response of Materials with Special Emphasis on In-situ Techniques
||Investigating Irradiation Creep by In Situ TEM
||Daniel Bufford, Baoming Wang, Khalid Hattar, Aman Haque
|On-Site Speaker (Planned)
Gradual deformation by creep proceeds through an intimate interplay among point defects, dislocations, grain boundaries, and other microstructural features. Irradiation conditions further enrich the scenario by continuously producing defects ranging from vacancy-interstitial pairs to larger defect clusters that alter the microstructure and affect the creep mechanisms themselves. A full, predictive understanding of irradiation creep requires an understanding of these mechanisms and their interactions, however irradiation creep presents a significant challenge in experimental design. Here, microfabricated nanocrystalline zirconium tension specimens were irradiated with 1.4 MeV zirconium ions while under concurrent mechanical loading in situ inside of a transmission electron microscope. The resulting datasets include time-resolved quantitative load and displacement information, and structural characterization with the nanometer resolving power of the TEM. This talk highlights challenges and important considerations in developing these experiments, as well as insights into fundamental aspects of irradiation creep behavior in nanocrystalline zirconium and other hcp metals.
||Planned: Supplemental Proceedings volume