|About this Abstract
||MS&T21: Materials Science & Technology
||Advanced Characterization of Materials for Nuclear, Radiation, and Extreme Environments
||Characterization of Materials Exposed to Coupled Nuclear Environments Using Positron Annihilation Spectroscopy and Electrical Impedance Spectroscopy
||Peter Hosemann, Rasheed Auguste, Farida Selim, Oskar M Linke, Maik Butterling, Hong L Chan, Junsoo Han, Jie Qiu, John R Scully, Ryan Schoell, Djamel Kaoumi
|On-Site Speaker (Planned)
Radiation effects do alter physical, mechanical, and chemical properties in materials. The underlying cause of these effects is the generation of point defects generated by displacement cascades. Most property changes are a result of the interaction of these defects with each other and with pre-existing defects. Especially the effects, defect structures may have on corrosion properties need to be considered for combinatorial (corrosion & irradiation) environments.
This work features positron annihilation spectroscopy (PAS) on Fe, Cr, Ni based materials previously exposed to a corrosive and irradiation environment. Electrical impedance spectroscopy (EIS) is performed to compare to PAS data and quantify the properties. Of course, transmission electron microscopy allows to shed light to the larger structure and puts PAS and EIS in context.
The systematic study of passive films formed on metal surfaces using these advanced techniques provides the baseline for a fundamental understanding of transport under reactor extremes.