Unusual nanoscale amorphization of metallic chromium interfacing with SiC under high energy irradiation
SCIE
SCOPUS
- Title
- Unusual nanoscale amorphization of metallic chromium interfacing with SiC under high energy irradiation
- Authors
- Quillin, Kyle; Sasidhar, K.N.; Qureshi, Muhammad Waqas; Yeom, Hwasung; Szlufarska, Izabela; Sridharan, Kumar
- Date Issued
- 2024-10
- Publisher
- Elsevier BV
- Abstract
- Layered metal/silicon carbide (SiC) materials systems are becoming increasingly relevant to solve materials challenges in advanced fission and fusion nuclear energy systems, necessitating a deeper understanding of how interfaces between dissimilar materials behave under high energy irradiation. In this work, we use a Cr-SiC bilayer system as a model to study the behavior of such interfaces under high energy ion irradiation (80 MeV Xe26+ ions) at elevated temperatures (similar to 350 degrees C). Through high resolution characterization of the interface, we observed the formation of a nanoscale Cr-rich amorphous layer adjacent to crystalline SiC. We explain this phenomenon through a multi-scale computational approach incorporating ballistic mixing simulations, density functional theory calculations, and CALPHAD-based non-equilibrium modeling that shows the localized amorphization of Cr to be driven by the synergistic action of irradiation-induced point defects within Cr and transport of Si and C atoms across the interface. In particular, the accumulation of radiation damage results in the thermodynamic destabilization of the point-defect containing, metastable Cr-Si-C solid solution with respect to an amorphous phase of identical composition. This study advances the understanding of how metal/SiC interfaces behave under irradiation and establishes a modeling framework that can be applied to interfacial systems to understand irradiation-induced amorphization.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/124116
- DOI
- 10.1016/j.actamat.2024.120236
- ISSN
- 1359-6454
- Article Type
- Article
- Citation
- Acta Materialia, vol. 278, page. 120236, 2024-10
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