| About this Abstract |
| Meeting |
MS&T22: Materials Science & Technology
|
| Symposium
|
Advanced Characterization of Materials for Nuclear, Radiation, and Extreme Environments III
|
| Presentation Title |
Materials in Extreme Environments Investigated with Positron Spectroscopy |
| Author(s) |
Rasheed Auguste, Peter Hosemann, M. Oskar Liedke, Maik Butterling, Farida Selim, Sebastian Lam, Djamel Kaoumi, Ho Lun Chan, Elena Romanovskaia, John R Scully |
| On-Site Speaker (Planned) |
Rasheed Auguste |
| Abstract Scope |
Radiation, corrosion, and surface damage effects do alter physical, mechanical, and chemical properties in materials. One underlying cause of these effects is the generation of point defects generated by phenomena such as radiation displacement cascades or pulsed laser ablation. Most property changes are a result of the interaction of these small-scale defects with each other and with pre-existing defects. The effect defect dynamics may have on overall material properties need to be considered for irradiation, corrosion, or high temperature environments. Positron annihilation spectroscopy is a unique, nondestructive technique to investigate small defects in materials difficult to investigate by other tools. In this work, doppler broadening and positron lifetime annihilation spectroscopy are utilized to help quantify the point defect damage and small vacancy clusters in materials exposed to irradiation, corrosion, and near-surface damage from laser ablation. |