|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Accelerated Materials Evaluation for Nuclear Application Utilizing Test Reactors, Ion Beam Facilities and Integrated Modeling
||Linking RIS and Grain Decohesion Using In Situ TEM 4-point Beams
||Kayla Yano, Janelle P Wharry
|On-Site Speaker (Planned)
The objective of this study is to utilize 4-pt bending microbeams to understand the link between radiation induced segregation (RIS) and grain boundary cohesion. Atomic-level chemical changes associated with RIS can affect grain boundary cohesion, which in turn alters mechanical and fracture properties. In situ transmission electron microscopy (TEM) mechanical testing enables a direct connection between the atomic and macro scales. This work focuses on a model Fe-9Cr oxide dispersion strengthend steel and an austenitic D9 alloy, both candidate materials for structural applications in advanced nuclear reactors. The alloys are ion irradiated to doses 3-100 displacements per atom at 500°C. The microbeams are fabricated with a transversely oriented grain boundary in the center. Quantitative stress-strain data and RIS measurements are collected and complemented by qualitative observation of grain dechoesion. In combination, the quantitative and qualitative data provides a more robust understanding of irradiation effects on grain boundary embrittlement and cohesion.
||Planned: Supplemental Proceedings volume