Damage relief of ion-irradiated Inconel alloy 718 via annealing

Fincher, Cole D.
Turman, Haley
French, Aaron
Chancey, Matthew
Gigax, Jonathan
Aydoğan Güngör, Eda
Zhao, Dexin
Yadav, Digvijay
Xie, Kelvin
Wang, Yongqiang
Borden, Mike
Shao, Lin
Maloy, S. A.
Pharr, Matt
Inconel alloy 718 is a high-strength and corrosion resistant alloy that is commonly used as a beamline vacuum window. The accumulation of irradiation-induced damage substantially decreases the window's service lifetime, and replacing it engenders significant beamline downtime. With this application in mind, herein we examine whether post-irradiation annealing can alleviate irradiation-induced damage of Inconel alloy 718. Inconel alloy 718 was received in a solution annealed state. We then irradiated samples using two different modalities (1.5 MeV H+ and 5 MeV Ni2+) at three representative temperatures for beamline windows (room temperature, 100 degrees C, and 200 degrees C), followed by annealing at temperatures viable for in-situ annealing processes (no anneal, 300 degrees C, and 500 degrees C). Using nanoindentation, we determined that irradiation-induced hardening occurs but is largely mitigated by post-irradiation annealing. Overall, our results suggest that in-situ annealing of radiation damage in Inconel alloy 718 vacuum windows appears feasible, which could potentially decrease beam downtime and maintenance costs.


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Citation Formats
C. D. Fincher et al., “Damage relief of ion-irradiated Inconel alloy 718 via annealing,” NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS, pp. 157–162, 2020, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/69979.