NSUF 16-832: Ion beam radiation damage assessment in advanced Ferritic/Martensitic (F/M) alloys
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 Ferritic/Martensitic alloys (Fe-9Cr F/M steel T91 and Fe-12Cr F/M steel HT9, ODS steel 14YWT, and model alloys Fe-9Cr and Fe-12Cr).
The samples will be irradiated with 1 MeV Kr++ ions at an incident angle ~15º from the specimen normal. The ion flux to be used is 6.2 × 1011 ions/cm2/s which correspond to about 1.12 × 10-3 dpa/s based on SRIM simulations. The focus of the experiments will be to look at the dislocation loops induced by irradiation and characterize their burgers vectors as well at their type (intersititial vs. vacancy) and density as a function of dose since the irradiations are done IN-SITU. 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. It is also a necessary method in order to understand how the microstructures observed in ion (and neutron) irradiated bulk samples (examined ex-situ) develop because, 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.
Note that the samples will be prepared by FIB lift out at NCSU, and although chemical analysis is not possible during the experiments at the IVEM (since there is no energy filter on the microscope), post irradiation chemical analysis will be done at NCSU using chemi-STEM method.
The period of performance should be between January 2017 and August 30th 2017
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 Ferritic/Martensitic alloys (Fe-9Cr F/M steel T91 and Fe-12Cr F/M steel HT9, ODS steel 14YWT, and model alloys Fe-9Cr and Fe-12Cr). The samples will be irradiated with 1 MeV Kr++ ions at an incident angle ~15º from the specimen normal. The ion flux to be used is 6.2 × 1011 ions/cm2/s which correspond to about 1.12 × 10-3 dpa/s based on SRIM simulations. The focus of the experiments will be to look at the dislocation loops induced by irradiation and characterize their burgers vectors as well at their type (intersititial vs. vacancy) and density as a function of dose since the irradiations are done IN-SITU. 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. It is also a necessary method in order to understand how the microstructures observed in ion (and neutron) irradiated bulk samples (examined ex-situ) develop because, 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. Note that the samples will be prepared by FIB lift out at NCSU, and although chemical analysis is not possible during the experiments at the IVEM (since there is no energy filter on the microscope), post irradiation chemical analysis will be done at NCSU using chemi-STEM method. The period of performance should be between January 2017 and August 30th 2017 |
| Award Announced Date | 2016-12-16T07:46:56.927 |
| 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 | 832 |