| About this Abstract |
| Meeting |
Materials Science & Technology 2020
|
| Symposium
|
Advanced Characterization of Materials for Nuclear, Radiation, and Extreme Environments
|
| Presentation Title |
Controlling Helium Morphology in Pure Metals: Effects of Helium Defects on Deformation and Strength |
| Author(s) |
Calvin R. Lear, Jonathan Gigax, Nan Li, Saryu Fensin |
| On-Site Speaker (Planned) |
Calvin R. Lear |
| Abstract Scope |
Prolonged irradiation of metal components results in the accumulation of excess microstructural defects, degradation of materials performance, and increased overall cost. Although the evolution of helium in structural materials is a crucial aspect of this problem, the impacts of helium morphology on materials strength are little understood beyond grain boundary effects. A systematic study of temperature-dose-dose rate interactions was thus performed in pure metals. The strength, ductility, and mode of deformation for helium implanted samples were probed using nanoindentation and micro-mechanical testing with in situ observation, while electron microscopy was used to investigate dislocation interactions with atomic clusters, spherical bubbles, and faceted bubbles of helium in the deformed samples. These findings are considered in terms of controlling helium defect nucleation and growth – and thus degradation – in metal components. |