Controlling diffusion for a self-healing radiation tolerant nanostructured ferritic alloy
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Diffusion plays a major role in the stability of microstructures to extreme conditions of high temperature and high doses of irradiation. In nanostructured ferritic alloys, first principle calculations indicate that the binding energy of vacancies is reduced by the presence of oxygen, titanium and yttrium atoms. Therefore, the number of free vacancies available for diffusion can be greatly reduced. The mechanical properties of these alloys, compared to traditional wrought alloys of similar composition and grain structure, is distinctly different, and the ultrafine grained alloy is distinguished by a high number density of Ti–Y–O-enriched nanoclusters and solute clusters, which drives the mechanical response. When a displacement cascade interacts with a nanocluster, the solute atoms are locally dispersed into the matrix by ballistic collisions, but immediately a new nanocluster reforms due to the local supersaturation of solutes and vacancies until the excess vacancies are consumed. Furthermore, the result of these processes is a structural material for advanced energy systems with a microstructure that is self-healing and tolerant to high doses of radiation and high temperatures.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- AC05-00OR22725
- OSTI ID:
- 1237626
- Alternate ID(s):
- OSTI ID: 1246585
- Journal Information:
- Journal of Nuclear Materials, Vol. 462, Issue C; ISSN 0022-3115
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Oxygen-18 Tracer Measurements of Anion Diffusion in Uranium Dioxide Thin Films
|
journal | September 2019 |
In Situ Studies on the Irradiation-Induced Twin Boundary-Defect Interactions in Cu
|
journal | August 2017 |
Advanced Materials for Next‐Generation Spacecraft
|
journal | August 2018 |
Similar Records
Advanced Oxide Dispersion Strengthened and Nanostructured Ferritic Alloys
Microstructural evaluation of a Fe-12Cr nanostructured ferritic alloy designed for impurity sequestration