NSUF 16-737: Microstructural recovery in irradiated nanostructured ferritic alloys
I have samples of 14YWT nanostructured ferritic alloy that have been ion-irradiated at cryogenic temperature. As a result, in the ~1500 nm deep irradiated zone, the grain boundary segregation (typically Cr-W) and the nano-oxide particles (Y-Ti-O, along with smaller amounts of Al-Y-O and Ti(O,C,N) ) have been homogenized into the matrix, leaving a chemically homogeneous single-phase structure. (This has been verified by atom probe and scanning/transmission electron microscopy [S/TEM]). This is a very non-equilibrium situation; solutes such as Y and Ti are thermodynamically driven to combine with oxygen and precipitate out of the supersaturated matrix, and other solutes such as Cr and W (along with significant precipitation) will be thermodynamically driven to go to the grain boundaries. Essentially, this structure has cryogenically locked-in the structure arising after the quench of the damage cascades, resulting in a situation that can be used to explore the underlying physics of recovery from radiation damage. I hypothesize that re-heating the as-irradiated structure will result in precipitation of the excess solutes and formation of a structure similar to the original, as-fabricated state. What is not clear is how this recovered structure will differ from the as-fabricated state, and quantitative analysis of the differences between the as-fabricated and recovered state should help inform physical models of the recovery of radiation damage in structural materials. Our overarching scientific goal is to measure quantitatively the differences in nano-oxide and grain boundary segregation in the as-fabricated material vs. the annealed + recovered material, with strong attention to the influence of grain boundary character (high-angle, low-angle, or coincident-site-lattice special boundary). Specific technical objectives are to (1) perform focused ion beam preparation of the cryogenically irradiated 14YWT. (2) Use transmission Kikuchi diffraction (tKD) and S/TEM to measure the grain boundary character and chemistry of a large ensemble of grains in the irradiated and unirradiated material. (3) Use in-situ heating in the S/TEM to drive recovery of the ion irradiated material. (4) Repeat the tKD and S/TEM measurements on the exact same areas to determine, first, the differences between the as-fabricated and damage-recovered states, and second, to determine the influence of grain boundary character on damage. The impact on the scientific state of knowledge will be to provide direct quantitative measurements of undamaged, radiation-damaged, and thermally-recovered states. This comprehensive and high-resolution data will provide the fundamental microstructural physics for expanding and validating models of radiation damage and recovery in complex structural alloys.
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| Поле | Стойност |
|---|---|
| Awarded Institution | Oak Ridge National Laboratory |
| Embargo End Date | 2026-02-27 |
| Facility Tech Lead | Gordon Kohse, Kory Linton |
| NSUF Call | FY 2017 RTE 1st Call |
| PI | Chad Parish |
| Project Member | Dr. Joy Rempe - Idaho National Laboratory |
| Project Member | Chad Parish - Oak Ridge National Laboratory (https://orcid.org/0000-0003-1209-7439) |
| Project Notes | Awarded on 12/16/2016 |
| Project Type | RTE |
| Publication | Viewpoint: Nanoscale chemistry and crystallography are both the obstacle and pathway to advanced radiation-tolerant materials Philip Edmondson, Chad Parish Scripta Materialia 143 2017-06-12 http://www.sciencedirect.com/science/article/pii/S1359646217302543#ac0005 |
| Publication | Flux and fluence dependent helium plasma-materials interaction in hot-rolled and recrystallized tungsten Chad Parish Journal of Nuclear Materials 510 2018-11-01 https://www.sciencedirect.com/science/article/pii/S0022311518304227#ack0010 |
| Publication | Applications of Combined Transmission Kikuchi Diffraction and STEM-SDD X-Ray Analysis in Irradiated Materials Chad Parish, Philip Edmondson, David Hoelzer Microscopy and Microanalysis 24 2018-08-01 https://doi.org/10.1017/S1431927618004178 |
| Publication | Microstructure and property tailoring of castable nanostructured alloys through thermomechanical treatments Lizhen Tan, Chad Parish Journal of Nuclear Materials 509 2018-10-01 https://www.sciencedirect.com/science/article/pii/S0022311518306147#ack0010 |
| Publication | Nucleation and growth of tungsten nanotendrils grown under divertor-like conditions Chad Parish Journal of Nuclear Materials 509 2018-10-01 https://www.sciencedirect.com/science/article/pii/S0022311518302721#ack0010 |
| Publication | Restructuring in high burnup UO2 studied using modern electron microscopy Tyler Gerczak, Chad Parish, Philip Edmondson, Kurt Terrani Journal of Nuclear Materials 509 2018-10-01 https://www.sciencedirect.com/science/article/pii/S0022311517316240#ack0010 |
| Publication | High-temperature strengthening mechanisms of Laves and B2 precipitates in a novel ferritic alloy Tianyi Chen, Chad Parish, Lizhen Tan Materials Science and Engineering: A 720 2018-03-01 https://www.sciencedirect.com/science/article/pii/S0921509318301977#ack0005 |
| Publication | Microscopy of Plasma-Materials Interactions in Tungsten for Fusion Power Kevin Field, Yutai Katoh, Chad Parish Microscopy & Microanalysis 22 2016-03-21 https://www.cambridge.org/core/journals/microscopy-and-microanalysis/article/div-classtitlemicroscopy-of-plasma-materials-interactions-in-tungsten-for-fusion-powerdiv/327C5D9EEC771CE9D8FDD9FA067C39C3 |
| Publication | Rationalization of anisotropic mechanical properties of Al-6061 fabricated using ultrasonic additive manufacturing Sudarsanam Babu, Maxim Gussev, Chad Parish, Niyanth Sridharan Acta Materialia 117 2016-09-01 http://www.sciencedirect.com/science/article/pii/S1359645416304797 |
| Publication | Surface morphologies of He-implanted tungsten Lauren Garrison, Chad Parish Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 382 2016-09-01 http://www.sciencedirect.com/science/article/pii/S0168583X16302002 |
| Publication | Microstructure and hydrothermal corrosion behavior of NITE-SiC with various sintering additives in LWR coolant environments Yutai Katoh, Takaaki Koyanagi, Chad Parish Journal of the European Ceramic Society 37 2017-04-01 http://www.sciencedirect.com/science/article/pii/S0955221916306331 |
| Publication | Using complimentary microscopy methods to examine Ni-Mn-Si-precipitates in highly-irradiated reactor pressure vessel steels Philip Edmondson, Chad Parish Acta Materialia 134 2017-08-01 http://www.sciencedirect.com/science/article/pii/S1359645417304305 |
| Publication | Characterization of He-Induced Bubble Formation in Tungsten due to Exposure from an Electron Cyclotron Resonance Plasma Source Chad Parish Fusion Science and Technology 72 2017-03-01 http://www.tandfonline.com/doi/full/10.1080/15361055.2017.1333856?scroll=top&needAccess=true |
| Publication | Irradiation-induced ß to a SiC transformation at low temperature Yutai Katoh, Takaaki Koyanagi, Chad Parish Scientific Reports 7 2017-03-27 https://www.nature.com/articles/s41598-017-01395-y?WT.feed_name=subjects_physical-sciences&error=cookies_not_supported |
| Publication | Equilibrium shapes and surface selection of nanostructures in 6H-SiC Yutai Katoh, Takaaki Koyanagi, Chad Parish Applied Physics Letters 110 2017-03-01 http://aip.scitation.org/doi/full/10.1063/1.4979550 |
| Publication | Morphologies of tungsten nanotendrils grown under helium exposure Chad Parish Scientific Reports 7 2017-02-14 https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5307965/ |
| Publication | Effect of starting microstructure on helium plasma-materials interaction in tungsten Chad Parish Acta Materialia 124 2017-02-01 http://www.sciencedirect.com/science/article/pii/S1359645416309090 |
| Publication | Helium sequestration at nanoparticle-matrix interfaces in helium + heavy ion irradiated nanostructured ferritic alloys Yutai Katoh, Chad Parish, Lizhen Tan, Steven Zinkle, Lance Snead, David Hoelzer Journal of Nuclear Materials 483 2017-01-02 http://www.sciencedirect.com/science/article/pii/S0022311516309874 |
| Publication | Microstructural evolution of pure tungsten neutron irradiated with a mixed energy spectrum Lauren Garrison, Yutai Katoh, Takaaki Koyanagi, Lance Snead Journal of Nuclear Materials 490 2017-04-13 http://www.sciencedirect.com/science/article/pii/S0022311516313010 |
| Publication | Microstructure and mechanical properties of titanium aluminum carbides neutron irradiated at 400–700 °C Caen Ang, Yutai Katoh, Chad Parish Journal of the European Ceramic Society 37 2017-05-01 http://www.sciencedirect.com/science/article/pii/S0955221917300390 |
| Publication | Plasma source development for fusion-relevant material testing Chad Parish, Clyde Beers Journal of Vacuum Science & Technology A 35 2017-05-01 http://avs.scitation.org/doi/full/10.1116/1.4982664 |
| Publication | Combining Transmission Kikuchi Diffraction and Scanning Transmission Electron Microscopy for Irradiated Materials Studies Philip Edmondson, Chad Parish, Kurt Terrani, Rachel Seibert, Yutai Katoh Microscopy & Microanalysis 23 2017-08-04 https://www.cambridge.org/core/journals/microscopy-and-microanalysis/article/combining-transmission-kikuchi-diffraction-and-scanning-transmission-electron-microscopy-for-irradiated-materials-studies/7621114362C9816656847F6E879D0E66 |
| Publication | Radiation tolerance of commercial and advanced alloys for core internals: a comprehensive microstructural characterization Miao Song, Chad Parish, Gary Was Journal of Nuclear Materials 510 2018-11-01 https://www.sciencedirect.com/science/article/pii/S0022311518306822#ack0010 |
| RTE Number | 737 |