Irradiation-tolerant nanostructured ferritic alloys: Transforming helium from a liability to an asset

Grain size and particle dispersion effects on the tensile behavior of friction stir welded MA956 oxide dispersion strengthened steel from low to elevated temperatures

“…As appealing as MA956 and other ODS steels are for nuclear applications, joining structural components comprised of ODS alloys is a key technology challenge limiting their use [6][7][8][9][10]. To address this issue, numerous research studies have shown that conventional fusion welding and other high temperature joining techniques of ODS alloys are problematic due to agglomeration of oxide particles which causes inconsistent material performance in particle depleted areas [11][12][13][14].…”

Probing Interfaces in Metals Using Neutron Reflectometry

“…These precipitates are usually deleterious to the properties of the solid, e.g., they lead to embrittlement in Ni-base alloys [59] and surface damage in plasma-facing materials [60]. Much effort has been invested into mitigating damage induced by implanted He, especially in materials for nuclear energy [61][62][63][64].…”

“…This change may be explained by the formation of a layer of reduced density on the Cu side of the Cu-Nb interface, as illustrated in Figure 4b. has been invested into mitigating damage induced by implanted He, especially in materials for nuclear energy [61][62][63][64]. One way of controlling implanted He is to trap it at specially designed internal interfaces in composite materials [61].…”

TBM/MTM for HTS-FNSF: An Innovative Testing Strategy to Qualify/Validate Fusion Technologies for U.S. DEMO

“…In addition, the microstructures of these alloys are being designed to provide more efficient trapping of helium and point defects to improve the overall tolerance to radiation damage. A further stage in the advancement of improved structural alloys is the development of nanostructured Oxide Dispersion Strengthened (ODS (NS)) alloys [20,21] containing 12%-14% chromium. In addition to providing even higher levels of …”

“…The future development of GEN-II RAFMs (based on nanostructured microstructures generated via conventional fabrication technologies) will provide higher creep strength sufficient to permit the extension of the operating regime up to~650 • C. In addition, the microstructures of these alloys are being designed to provide more efficient trapping of helium and point defects to improve the overall tolerance to radiation damage. A further stage in the advancement of improved structural alloys is the development of nanostructured Oxide Dispersion Strengthened (ODS (NS)) alloys [20,21] containing 12%-14% chromium. In addition to providing even higher levels of radiation-damage tolerance via more efficient trapping of point defects and helium atoms, the exceptional thermal stability of their nano-scale microstructures would provide enhanced tolerance to off-normal temperature excursions during an accident.…”