| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Phase Transformations and Microstructural Evolution
|
| Presentation Title |
Atomic Structures and Processes in Al-Cu alloys |
| Author(s) |
Matthew F. Chisholm, Dongwon Shin, Gerd Duscher, Lawrence Allard, Amit Shyam |
| On-Site Speaker (Planned) |
Matthew F. Chisholm |
| Abstract Scope |
The highest strength aluminum alloys feature a dense distribution of precipitates formed by solid-state nucleation and growth. However, an understanding of atomic processes involved in this prototypical phase transformation is not complete. Using a combination of aberration-corrected electron microscopy and first principles calculations, the atomic structures and energetics at the interfaces between the aluminum matrix and 𝜃′-Al2Cu precipitates were examined. The atomic structures of these interfaces are critical in the development of the precipitate and in the evolving properties of the Al-Cu alloys. The atomic arrangements within the 𝜃′ precipitates and across the interphase boundaries will be presented to reveal several important features of how the precipitate grows. The interaction between Cu solute and the interfaces will be presented using results from Al-Cu alloys with a range of Cu contents. The role of the interfaces in elevated temperature strengthening and coarsening resistance will be discussed. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |