NSUF 15-540: Si-Ni-Mn clustering in irradiated Fe-9Cr oxide dispersion strengthened alloy
The objective of this project is to understand the role of Si, Ni, and Mn clustering in irradiated ODS alloys. Oxide-dispersion strengthened (ODS) alloys are nanofeatured materials, having grains of diameter ~250 nm, and containing a dispersion of oxide nanoparticles. The fine grains and oxide nanoparticles provide the alloy with high strength at elevated temperatures and dimensional stability under irradiation, making ODS alloys leading candidates for structural components in fusion and advanced fission reactors. Most post-irradiation evaluation (PIE) experiments of ODS alloys have focused on evaluating the radiation stability of the oxide nanoparticles. There have been no studies, to our knowledge, of Si, Ni, and Mn clustering in ODS alloys. But through previous ATR-NSUF rapid turnaround experiments, we have observed clustering of Si, Ni, and Mn in a model Fe-9Cr ODS steel irradiated with neutrons (3 dpa, 500°C), protons (3 dpa, 500°C), and Fe++ ions (100 dpa, 400°C). Results have shown the Si-Ni-Mn-rich clusters to form about existing oxide nanoparticles, which themselves dissolve under irradiation. This project will perform a more systematic irradiation series in order to more precisely evaluate the dose evolution of the Si-Ni-Mn-rich clusters and to ascertain a clearer understanding of the mechanisms of oxide dissolution and Si-Ni-Mn clustering. Furthermore, this project will provide insight into whether Si, Ni, and Mn clustering could stabilize the oxide nanoparticles under irradiation. The proposed project will focus on a model Fe-9Cr ODS alloy and will conduct the following irradiations at the Michigan Ion Beam Laboratory (MIBL): (1) 2.0 MeV protons, 1 dpa, 500°C (2) 2.0 MeV protons, 7 dpa, 500°C (3) 5.0 MeV Fe++ ions, 1 dpa, 500°C (4) 5.0 MeV Fe++ ions, 3 dpa, 500°C (5) 5.0 MeV Fe++ ions, 100 dpa, 500°C Together with previously-studied samples, these irradiations will provide a proton and a Fe++ ion irradiation dose series at 500°C. Irradiation (4) provides the identical dose and temperature as the previously-studied 500°C, 3 dpa proton and neutron irradiations; having the same alloy irradiated with three different particles, but to otherwise identical conditions, is a rare and unique opportunity offered by this project, and it can potential provide tremendous insight into the mechanistic differences between irradiation damage caused by neutrons versus protons versus self-ions. This project will help us understand the role of Si-Ni-Mn clustering in the irradiation stability of oxide nanoparticles in ODS steels, which is critical to the long-term material integrity of ODS alloys in cladding and structural components in fission and fusion reactors. Results of this project will be relevant to all ODS and other nanostructured alloys based on the b.c.c Fe-Cr matrix, which are of growing interest to the Department of Energy Office of Nuclear Energy, due to their enhanced radiation resistance.
Papildoma informacija
| Laukas | Reikšmė |
|---|---|
| Awarded Institution | Boise State University |
| Embargo End Date | 2026-02-27 |
| Facility Tech Lead | Jeff Terry, Kevin Field |
| NSUF Call | FY 2015 RTE 1st Call |
| PI | Janelle Wharry |
| Project Member | Jeff Terry, Prof. - Illinois Institute of Technology (https://orcid.org/0000-0001-7881-3667) |
| Project Member | Professor Janelle Wharry, Professor - University of Illinois (https://orcid.org/0000-0001-7791-4394) |
| Project Type | RTE |
| Publication | TEM in situ cube-corner indentation analysis using ViBe motion detection algorithm Matthew Swenson, Janelle Wharry, Kayla Yano, Stephen Thomas Journal of Nuclear Materials 502 2018-04-15 https://doi.org/10.1016/j.jnucmat.2018.02.003 |
| Publication | TEM characterization of irradiated microstructure of Fe-9%Cr ODS and ferritic-martensitic alloys Matthew Swenson, Janelle Wharry Journal of Nuclear Materials 502 2018-04-15 https://www.sciencedirect.com/science/article/pii/S0022311517313910 |
| Publication | Plastic zone size for nanoindentation of irradiated Fe-9wt% Cr ODS alloy Janelle Wharry, Corey Dolph, Matthew Swenson Journal of Nuclear Materials 481 2016-11-01 https://www.sciencedirect.com/science/article/pii/S0022311516306559#ack0010 |
| Publication | Collected data set size considerations for atom probe cluster analysis Janelle Wharry, Matthew Swenson Microscopy & Microanalysis 22 2016-02-01 http://journals.cambridge.org/fulltext_content/supplementary/MAM22_S3_minisite/7337/0690.pdf |
| Publication | Nanocluster irradiation evolution in Fe-9%Cr ODS and ferritic-martensitic alloys Matthew Swenson, Janelle Wharry Journal of Nuclear Materials 2017 2017-12-01 https://www.sciencedirect.com/science/article/pii/S002231151730692X#ack0010 |
| Publication | A review of the irradiation evolution of dispersed oxide nanoparticles in the b.c.c. Fe-Cr system: Current understanding and future directions Janelle Wharry, Matthew Swenson, Kayla Yano Journal of Nuclear Materials 486 2017-04-17 https://www.sciencedirect.com/science/article/pii/S0022311516309734 |
| Publication | TEM in situ micropillar compression tests of ion irradiated oxide dispersion strengthened alloy Matthew Swenson, Janelle Wharry, Yaqiao Wu, Kayla Yano Journal of Nuclear Materials 483 2016-11-10 https://www.sciencedirect.com/science/article/pii/S0022311516310340 |
| RTE Number | 540 |