Eutectic aluminum rare-earth (RE) alloy system is of great interest to engine materials community for its potential to provide lightweight and castable alloy materials for elevated temperature applications. In contrast to conventional aluminum alloys, the eutectic Al-RE alloy system resorts to dispersion of intermetallic phases for the bulk of its strength in addition to precipitation and solid solution. Consequently, the alloy is more stable in both microstructure and strength when exposed to long-term thermal conditions. One of the remarkable benefits of the stable microstructure is the enhancement of its creep resistance at elevated temperatures, which is one of the critical properties for engine structural applications.