NSUF 17-981: Quantitative assessment of the role of interfaces and grain boundaries in the development of radiation tolerant nuclear materials
Grain boundaries (GBs) are known as effective sinks for point defects created under irradiation, making them an attractive tuning parameter in order to engineer materials with superior radiation tolerance. Therefore, in the quest of advanced nuclear materials which are self-healing under irradiation and have longevity, nanocrystalline materials and GB engineering on ultrafine grain (UFG) materials have gained much traction over the past decade, however it is not clearly understood how the defects manifest and annihilate themselves at the GBs. In this user proposal, we aim to examine through in situ ion irradiation TEM experiments the role of sinks in damage mitigation at the atomic-level by understanding the interaction of irradiation induced defect clusters and dislocation loops with GBs. Specifically, we will focus on the absorption, saturation and possible ejection of these defects at sinks in GB engineered Ni alloys and nanocrystalline FCC and BCC materials (Au, Ta, Mo, and Ni). We will be primarily interested in quantifying the time dependence of defect absorption at sinks, as well as any dependence these interactions have on strain between grains; for example, the efficiency of defect absorption in UFG Ni alloys will provide results comparable to an investigation of this efficiency in more complex interfaces of nanocrystalline. The interest in time dependency of irradiation induced defect absorption makes in situ irradiation necessary for these experiments as the observation over time of defect behavior is otherwise impossible.
Papildoma informacija
| Laukas | Reikšmė |
|---|---|
| Awarded Institution | Drexel University |
| Embargo End Date | 2026-02-27 |
| Facility Tech Lead | Mukesh Bachhav, Wei-Ying Chen |
| NSUF Call | FY 2017 RTE 2nd Call |
| PI | Mitra Taheri |
| Project Member | Dr. Mitra Taheri, Professor - Johns Hopkins University |
| Project Member | Kathryn Small - Drexel University |
| Project Member | Pranav Kumar Suri, Postdoctoral Scientist - Drexel University |
| Project Notes | Awarded on 04/24/2017 |
| Project Type | RTE |
| Publication | Exploring radiation induced segregation mechanisms at grain boundaries in equiatomic CoCrFeNiMn high entropy alloy under heavy ion irradiation James Nathaniel II, Yongqiang Wang, Mitra Taheri Scripta Materialia 156 2018-11-01 https://www.sciencedirect.com/science/article/pii/S1359646218304068#ac0005 |
| Publication | Unravelling Irradiation-Induced Detwinning Mechanisms via In Situ and Aberration-Corrected TEM combined with Atomistic Simulations Pranav Kumar Suri, James Nathaniel II, Meimei Li, Mitra Taheri Microscopy and Microanalysis Suppl 1 2018-08-01 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/4FE618E35AB6D874E0B7459F22CD2929/S1431927618010115a.pdf/unravelling_irradiationinduced_detwinning_mechanisms_via_in_situ_and_aberrationcorrected_tem_combined_with_atomistic_simulations.pdf |
| Publication | In Situ TEM Evidence of Temperature Dependent Defect Morphology in Heavy Ion Irradiated Nanocrystalline Molybdenum James Nathaniel II, Pranav Kumar Suri, Mitra Taheri Microscopy and Microanalysis 24 2018-08-01 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/45E5287FFBDE9D1669D308D42757235E/S1431927618010164a.pdf/in_situ_tem_evidence_of_temperature_dependent_defect_morphology_in_heavy_ion_irradiated_nanocrystalline_molybdenum.pdf |
| Publication | Observation of oscillatory radiation induced segregation profiles at grain boundaries in neutron irradiated 316 stainless steel using atom probe tomography James Cole, Mitra Taheri Journal of Nuclear Materials 504 2018-06-01 https://www.sciencedirect.com/science/article/pii/S0022311517314174#ack0010 |
| RTE Number | 981 |