|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Materials and Fuels for the Current and Advanced Nuclear Reactors VII
||Investigation on the Damage Mechanism of Plasma-materials Interface by Multi-scale Electron Microscopy Methods
||Kun Wang, Chad M Parish, Russell Doerner, Matthew Baldwin, Fred W Meyer
|On-Site Speaker (Planned)
Tungsten is the primary candidate of selection for plasma-facing materials (PFMs) in magnetic confinement nuclear reactor. However, tungsten will suffer from large flux (10<SUP>22</SUP>-10<SUP>24</SUP> He/m<SUP>2</SUP>s) and low energy (tens to a few hundred eV) helium ions, causing the formation of subsurface helium bubbles and surface nanotendril “fuzzes”. In order to investigate the damage mechanism of plasma-materials interface, recently, we have exposed hot-rolled and recrystallized tungsten to 65-80 eV helium ions with various flux ranging from 10<SUP>17</SUP> to 10<SUP>22</SUP> He/m<SUP>2</SUP>s to fluence variations from 10<SUP>21</SUP> to 10<SUP>24</SUP> He/m<SUP>2</SUP> at a temperature of 800-900 °C. After exposure, the specimens present either surface morphology changes or well-developed nano-fuzz. Multi-, including high resolution scanning electron microscopy (SEM), Electron backscatter diffraction (EBSD), Scanning/Transmission Electron Microscopy (S/TEM) and transmission Kikuchi diffraction (tKD), were performed to study the evolution of microstructures after helium exposure. Dedicated characterization of helium bubbles and nanotendrils will be presented.
||Planned: Supplemental Proceedings volume