|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Phase Transformation Across Multiscale Material Interfaces
||Prevention of Coarsening Induced Phase Transformations in Al-Cu Alloys: Role of Interfaces
||Amit Shyam, Dongwon Shin, Yukinori Yamamoto, Patrick Shower, Brian Milligan, James Morris, Lawrence Allard, Jonathan Poplawsky, Juan Idrobo, German Samolyuk, James A Haynes
|On-Site Speaker (Planned)
This presentation will focus on the role of interfacial structure and chemistry in preventing detrimental phase transformations in Al-Cu alloys. The differences between the structure of coherent and semi-coherent interfaces in the metastable theta prime (Al2Cu) precipitates will be highlighted. Further, it will be demonstrated that the difference in the solute segregation profiles for these two kinds of interfaces have a strong bearing on the coarsening resistance of Al-Cu type alloys. First principles calculations for segregation of multiple solutes of interest on the relevant interfaces support the role of microalloying elements in determining the elevated temperature stability of Al-Cu alloys. Finally, results from a phase field modeling effort to delineate the thermodynamic and kinetic factors that determine the elevated temperature stability of theta prime precipitates will be summarized. Research was sponsored by the Laboratory Directed Research and Development Program of Oak Ridge National Laboratory.
||Planned: Supplemental Proceedings volume