| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Continuous Phase Transformations
|
| Presentation Title |
Competitive Partitioning and Decomposition Evolution in Nanocrystalline Alloys |
| Author(s) |
Gregory B. Thompson, Xuyang Zhou, Reza Darvishi Kamachali, Jaber Rezaei Mianroodi, Alisson Kwiatkowski da Silva, Pratheek Shanthraj, Dirk Ponge, Baptiste Gault, Bob Svendsen, Dierk Raabe, Brad L. Boyce, Blythe G. Clark, Blythe G. Clark, Blythe G. Clark |
| On-Site Speaker (Planned) |
Gregory B. Thompson |
| Abstract Scope |
Spinodal decomposition is often described as a ‘barrier-free’ transformation. Unlike nucleation and growth, where defects play a dominate role in the nucleation of the secondary phase, such defects are largely considered inconsequential to this continuous phase transformation. At the nanoscale, where a high density of planar defects exist, their presence can have a profound influence on the temporal evolution of the transformation. In this presentation, the phase separation of a Pt(Au) nc alloy is characterized using a correlative method of electron diffraction and atom probe. A competition between interfacial segregation to the grain boundaries and spinodal decomposition is observed. Using a density-based phase field model for the grain boundary influence on the Gibbsian free energy for the transformation is used to elucidate how grain character influences the transformation. Furthermore, the presence of dislocations are also characterized revealing a distinct chemical structure in these defect structures. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Phase Transformations, Thin Films and Interfaces, Characterization |