| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
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| Symposium
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Methods, Techniques, and Materials Discovery of Irradiation Effect Using In-situ Microscopy
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| Presentation Title |
Effect of Stacking Fault Energy on Microstructural Evolution of Compositionally Complex Alloys under In situ Dual-beam Heavy-ion Irradiation |
| Author(s) |
Calvin A. Parkin, Boris Maioriv, Kumar Sridharan, Wei-Ying Chen, Meimei Li, Adrien Couet |
| On-Site Speaker (Planned) |
Calvin A. Parkin |
| Abstract Scope |
Compositionally complex alloys (CCAs) with a base matrix of four or more principal alloying elements may resist radiation degradation by void swelling due to unique energy and mass transport properties. Because the steady-state swelling rate of austenitic alloys is consistent after voids nucleate (1%/dpa), the effect of composition on nucleation in a bubble-stabilizing He environment was investigated and presented at TMS2022. Heavy-ion irradiation of two CCAs, Cr15Fe35Mn15Ni35 and Cr18Fe27Mn27Ni28 were performed at the IVEM-Tandem facility at ANL using 1 MeV Kr++ and 16 keV He+ co-implantation up to 7 dpa and 0.75% He/dpa at temperatures of 773K and 873K. Results were compared to less compositionally complex single-phase FCC materials and discussed alongside single-beam high-temperature in situ and high-dpa ex situ irradiations. The difference in faulted loop populations was attributed to the stacking-fault energy, which has recently been measured experimentally using TEM to be lower in Cr15Fe35Mn15Ni35 than in Cr18Fe27Mn27Ni28. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, Nuclear Materials, Characterization |