|About this Abstract
||2020 TMS Annual Meeting & Exhibition
||Accelerated Materials Evaluation for Nuclear Applications Utilizing Irradiation and Integrated Modeling
||Recent Applications of Ex-situ Transient Grating Spectroscopy to the Study of Radiation-induced Degradation of Nuclear Materials
||Sara Elizabeth Ferry, Cody Dennett , Angus Wylie, Pär Olsson, Michael Short
|On-Site Speaker (Planned)
||Sara Elizabeth Ferry
Transient grating spectroscopy (TGS) is a non-contact, non-destructive optical heterodyne detection technique used to quickly obtain acoustic and thermal transport properties in irradiated materials. TGS is a useful tool for detecting and characterizing radiation damage induced changes in nuclear materials with greater ease and speed than is afforded by traditional post-irradiation examination (PIE) techniques, and can be used both in situ and ex situ. Here, we present recent results from two ongoing ex situ studies. In the first, we expand upon previous work examining irradiation-induced thermal diffusivity changes in single crystal niobium by repeating the experiment with additional metals, and supplementing the experimental results for all tested metals with density functional theory (DFT) studies. In the second, we demonstrate that TGS can be used to detect the onset of “fuzz” development in plasma-exposed polycrystalline tungsten. This radiation damage mode is of particular concern for first-wall materials in fusion devices.