|About this Abstract
||2023 TMS Annual Meeting & Exhibition
||Phase Transformations and Microstructural Evolution
||Microstructural Evolution in an Aluminum-Cerium Alloy under Long Term Aging Conditions
||Opemipo Adetan, Dinc Erdeniz
|On-Site Speaker (Planned)
Aluminum-cerium alloys have attracted the interest of the aluminum alloy community due to their excellent microstructural stability at elevated temperatures, providing strengthening via the formation of Al11Ce3 intermetallic upon eutectic solidification. The addition of erbium, scandium, and zirconium has further improved the ambient and elevated-temperature mechanical properties. This investigation focuses on the long-term microstructural evolution of an Al-Ce-Er-Sc-Zr alloy, with an emphasis on the two strengthening phases, Al11Ce3 and L12-ordered Al3(Er, Sc, Zr). Isothermal aging treatments for up to 3000 hours are conducted to evaluate the evolution of these two phases, using microhardness tests, optical and electron microscopy, and X-ray diffraction studies. High-temperature tensile tests and creep experiments are performed to reveal the effect of these heat treatments on the thermo-mechanical performance of the alloy and to further investigate microstructural evolution under simulated service conditions. CALPHAD modeling is employed to aid our understanding of this alloy with promising elevated-temperature properties.
||Aluminum, Phase Transformations, High-Temperature Materials