About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
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TMS Frontiers of Materials Award Symposium: Harnessing Charged and Chemical Defects for Exceptional Structural and Functional Properties
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| Presentation Title |
Investigation of grain boundary segregation in ceramic materials using advanced electron microscopy |
| Author(s) |
Bin Feng, Naoya Shibata, Yuichi Ikuhara |
| On-Site Speaker (Planned) |
Bin Feng |
| Abstract Scope |
Grain boundary (GB) segregation is of paramount importance in both metal and ceramic materials, as the enrichment of dopant atoms at GBs significantly influences microstructure, which further determining the macroscopic properties of polycrystalline ceramics. Recent advancements in aberration-corrected scanning transmission electron microscopy (STEM) and related techniques have enabled the direct observation of GB segregation phenomena at atomic scale, enhancing our understanding of this critical process.
In this study, we present our recent studies of GB segregation in ceramic materials, focusing on Al2O3 and ZrO2 GBs utilizing atomic-resolution STEM. Model GBs in doped Al₂O₃ and ZrO₂ were fabricated by the bicrystal method and subsequently analyzed by atomic-resolution STEM. Our results reveal that GB segregation in ceramics is a complex phenomenon, involving structural transformations at the GB and long-range Coulomb interactions between GB and dopants. These results will be discussed in detail during the presentation. |