About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
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Nanostructured Materials in Extreme Environments
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Presentation Title |
Role of Electronic Energy Loss on Interface Stability of Nanostructured High-Entropy Alloys |
Author(s) |
Yanwen Zhang, Chinthaka Silva, Timothy G. Lach, Matheus A. Tunes, Philip D. Rack, Stephen E. Donnelly, William J. Weber |
On-Site Speaker (Planned) |
Yanwen Zhang |
Abstract Scope |
Some high-entropy alloys (HEAs) exhibit improved structural stability in harsh environments. Energetic ion irradiation is often used as a surrogate for neutron irradiation; however, the impact of electronic energy deposition and dissipation is often overlooked. In many chemically complex alloys, their decreased thermal conductivity and slow dissipation of radiation energy can have noticeable effects on displacement cascade evolution. Irradiation response of nanocrystalline Ni20Fe20Co20Cr20Cu20 and (NiFeCoCr)97Cu3 reveals that the overall grain growth results from both inelastic thermal spikes via electron-phonon coupling and elastic thermal spikes via collisions among atomic nuclei. The growth follows a power law dependence on the total deposited ion energy. The derived high value of the power-exponent is attributed to the sluggish diffusion and delayed defect evolution arising from the chemical complexity intrinsic to HEAs. This work calls attention to quantified fundamental understanding of radiation damage processes beyond that of simplified displacement events. |
Proceedings Inclusion? |
Planned: |
Keywords |
Characterization, Thin Films and Interfaces, High-Entropy Alloys |