About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
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Symposium
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Deformation and Transitions at Grain Boundaries VII
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Presentation Title |
Interplay of Chemistry and Faceting at Grain Boundaries in an Al-alloy
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Author(s) |
Huan Zhao, Liam Huber, Wenjun Lu, Nicolas Peter, Dayong An, Frédéric De Geuser, Dirk Ponge, Baptiste Gault, Dierk Raabe |
On-Site Speaker (Planned) |
Huan Zhao |
Abstract Scope |
The boundary between two crystalline grains can decompose into arrays of facets with distinct crystallographic character. Faceting occurs to minimize the system’s free energy, i.e. when the total interfacial energy of all facets is below that of the topologically shortest interface plane. In a model engineering Al-alloy, we show that faceting occurs at selected coincident-site lattice boundaries and these facets strongly interact with the local chemistry. This faceting-chemistry interplay acts differently for different types of facets and leads to the formation of periodic segregation patterns, or to the asymmetric precipitation. This study shows that segregation-faceting interplay is not limited to bicrystals but may exist in engineering Al-alloys and hence affect their performance. |
Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |