|About this Abstract
||Materials Science & Technology 2019
||Ultra High Performance Metallic Systems for Aerospace, Defense, and Automotive Applications
||Outstanding Fracture Toughness and Fatigue Strength of a Cast Al-Cu Alloy Promoted by Nanoparticles
||Qinglong Zhao, Xiao Liu, Qichuan Jiang
|On-Site Speaker (Planned)
Fatigue resistance and fracture toughness are essential to the reliability of castings during service. Reducing microporosity in cast alloys is a crucial issue for improving their fatigue strength and fracture toughness. Here we report a significant reduction in microporosity of a cast aluminum-copper alloy developed using in situ TiC nanoparticle additions coupled with a stir-casting method. The addition of TiC nanoparticles is found to improve the interdendritic feedability of liquid metal and as a result reduces the volume fraction of microporosity by two orders of magnitude compared to a conventionally cast Al-Cu alloy. This method, which is mechanistically associated with a pore-dominated process, acts to significantly improve the fatigue strength, fracture toughness and uniform elongation of the cast Al-Cu alloy.
||Definite: At-meeting proceedings