About this Abstract |
Meeting |
6th World Congress on Integrated Computational Materials Engineering (ICME 2022)
|
Symposium
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6th World Congress on Integrated Computational Materials Engineering (ICME 2022)
|
Presentation Title |
Effect of Grain Boundary Migration on Radiation Induced Segregation in Polycrystalline Metal |
Author(s) |
Aashique Alam Rezwan, Yongfeng Zhang |
On-Site Speaker (Planned) |
Aashique Alam Rezwan |
Abstract Scope |
Radiation-induced segregation (RIS) can detrimentally degrade the mechanical properties and corrosion resistance of materials used in nuclear reactors. While in coarse-grained alloys, the grain boundaries (GB) and the grain size are regarded as static under irradiation, in nanocrystalline materials RIS is accompanied by grain growth via GB migration. In this work, a diffusion-based model is developed for RIS in ternary Fe-Cr-Ni model alloy considering both the vacancy and interstitial mediated diffusion. When grain growth is activated simultaneously, the overall RIS is found to increase with increasing average grain size. An inhomogeneous concentration is observed in grains of different sizes. At a moving GBs, the segregation profile becomes asymmetrical, in contrast to the symmetrical profile at static GBs. While Cr is still depleted behind a moving GB, it becomes enriched in the front. These findings imply different effects of RIS in nanocrystalline alloys than those in their coarse-grained counterparts. |
Proceedings Inclusion? |
Definite: Other |