Response of nanostructured ferritic alloys to high-dose heavy ion irradiation

Journal Article · Sat Feb 01 04:00:00 EST 2014 · Journal of Nuclear Materials, 445(1-3):251-260

DOI:https://doi.org/10.1016/j.jnucmat.2013.11.002· OSTI ID:1115804

Parish, Chad M.; White, Ryan M.; LeBeau, James M.; Miller, Michael K.

A latest-generation aberration-corrected scanning/transmission electron microscope (STEM) is used to study heavy-ion-irradiated nanostructured ferritic alloys (NFAs). Results are presented for STEM X-ray mapping of NFA 14YWT irradiated with 10 MeV Pt to 16 or 160 dpa at -100°C and 750°C, as well as pre-irradiation reference material. Irradiation at -100°C results in ballistic destruction of the beneficial microstructural features present in the pre-irradiated reference material, such as Ti-Y-O nanoclusters (NCs) and grain boundary (GB) segregation. Irradiation at 750°C retains these beneficial features, but indicates some coarsening of the NCs, diffusion of Al to the NCs, and a reduction of the Cr-W GB segregation (or solute excess) content. Ion irradiation combined with the latest-generation STEM hardware allows for rapid screening of fusion candidate materials and improved understanding of irradiation-induced microstructural changes in NFAs.

• Research Organization: Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 1115804
• Journal Information: Journal of Nuclear Materials, 445(1-3):251-260, Journal Name: Journal of Nuclear Materials, 445(1-3):251-260
• Country of Publication: United States
• Language: English

Related Subjects

Environmental Molecular Sciences Laboratory