|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Computational Thermodynamics and Kinetics
||A Phase Field Theory Based Study of the Role of Microalloying Elements in Determining the Microstructural Stability of Al-Cu Alloys
||Patrick Shower, James Morris, Dongwon Shin, Balasubramaniam Radhakrishnan, Lawrence Allard, Jonathan Poplawsky, Amit Shyam
|On-Site Speaker (Planned)
Certain alloying elements can dramatically enhance the thermal stability of strengthening θ′ precipitates in Al-Cu alloys, delaying or preventing their transformation to the detrimental θ phase, which is thermodynamically favored. Phase Field simulations were used to study the influence of stress, elevated temperature, and microalloying elements on the evolution of precipitate-strengthened microstructures in Al-Cu-X alloys. Simulations were designed to provide insight into four potential mechanisms for microstructural stabilization, namely: solute drag, diffusion barriers, reduced lattice mismatch between phases, and reduced interfacial energy. The effectiveness and synergy between the four mechanisms are described at temperatures and stress levels of interest. These simulation results are compared to experimental observations of temperature-dependent microstructural evolution made with atom probe tomography and electron microscopy methods.
This Research was sponsored by the Laboratory Directed Research and Development Program of Oak Ridge National Laboratory, managed by UT-Battelle, LLC, for the U. S. Department of Energy.
||Planned: Supplemental Proceedings volume