About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
Advanced Characterization of Materials for Nuclear, Radiation, and Extreme Environments VI
|
| Presentation Title |
Strain Field Evolution Around MX Precipitates in a Ferrite Matrix After Neutron Irradiation at 490°C to 7.4 dpa |
| Author(s) |
Emily Proehl, Yan-Ru Lin, Weicheng Zhong, Steven J. Zinkle |
| On-Site Speaker (Planned) |
Emily Proehl |
| Abstract Scope |
Engineering a high number density of nanoscale precipitates is a leading strategy to introduce radiation tolerance in nuclear structural alloys through the concept of “sink strength”, or the propensity of a microstructural feature to facilitate point defect recombination. The strain field around precipitates’ interfaces is directly related to the capture radius to attract point defects and point defect clusters, allowing for recombination. In this work, model ferritic alloys containing nanoscale TaC and TaN MX-type precipitates, respectively, were investigated before and after neutron irradiation in the High Flux Isotope Reactor to 7.4 dpa at 490°C. Geometric phase analysis (GPA) strain mapping around the MX precipitates was performed using atomic resolution images from a Cs-corrected scanning transmission electron microscope (STEM), as well as atomic resolution chemical mapping. MX precipitate stability, strain field evolution, and defect interaction were observed and corresponding implications on alloy design will be discussed. |