NSUF 17-1073: Ion irradiation response of nanostructured alloys: In-situ TEM observations vs. ex-situ characterization
In-situ transmission electron microscopy (TEM) combined with ion irradiation is a powerful tool to characterize the microstructural evolution under irradiation because the microstructure evolution can be followed as the damage proceeds. The objective of the work is to investigate the microstructure evolution under ion irradiation in advanced nanostructured alloys (14YWT, 18Cr-ODS and NC-T91) using both in-situ TEM observation and ex-situ microchemistry analysis. The focus of the experiments will be to look at the dislocation loops induced by irradiation and characterize their burgers vectors and density as a function of dose. Such in-situ experiments are invaluable to obtain kinetics of the defect formation in these alloys and show how the irradiation induced damage spatially correlates with the pre-existing microstructure. The chemical stability of the matrix and the dispersion will be a major point of interest. It is also a necessary method in order to understand the microstructures observed in ion (and neutron) irradiated bulk samples examined ex-situ for, in these cases, only snapshots are available at limited doses. As far as bigger impact, these experiments are part of a larger effort involving several universities with the goal to demonstrate the capability of predicting the evolution of microstructure of F/M alloys in-reactor and at high doses, using ion irradiation as a surrogate for reactor irradiations. When possible, the observations done in situ will be compared with the observations done on the same alloys irradiated in BOR 60.
Additional Info
| Field | Value |
|---|---|
| Abstract | In-situ transmission electron microscopy (TEM) combined with ion irradiation is a powerful tool to characterize the microstructural evolution under irradiation because the microstructure evolution can be followed as the damage proceeds. The objective of the work is to investigate the microstructure evolution under ion irradiation in advanced nanostructured alloys (14YWT, 18Cr-ODS and NC-T91) using both in-situ TEM observation and ex-situ microchemistry analysis. The focus of the experiments will be to look at the dislocation loops induced by irradiation and characterize their burgers vectors and density as a function of dose. Such in-situ experiments are invaluable to obtain kinetics of the defect formation in these alloys and show how the irradiation induced damage spatially correlates with the pre-existing microstructure. The chemical stability of the matrix and the dispersion will be a major point of interest. It is also a necessary method in order to understand the microstructures observed in ion (and neutron) irradiated bulk samples examined ex-situ for, in these cases, only snapshots are available at limited doses. As far as bigger impact, these experiments are part of a larger effort involving several universities with the goal to demonstrate the capability of predicting the evolution of microstructure of F/M alloys in-reactor and at high doses, using ion irradiation as a surrogate for reactor irradiations. When possible, the observations done in situ will be compared with the observations done on the same alloys irradiated in BOR 60. |
| Award Announced Date | 2017-09-20T12:32:00.867 |
| Awarded Institution | None |
| Facility | None |
| Facility Tech Lead | Wei-Ying Chen |
| Irradiation Facility | None |
| PI | Djamel Kaoumi |
| PI Email | [email protected] |
| Project Type | RTE |
| RTE Number | 1073 |