|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Aluminum Alloys, Processing and Characterization
||Effect of Ag and Mg Additions on the Nature of Grain Boundary Precipitates and Fracture Behavior of Al-Cu-Li Alloys
||Ramasis Goswami, Noam Bernstein
|On-Site Speaker (Planned)
Commercial Al-Li-Cu alloys are highly desirable candidate for aircraft components because of their lower density and higher stiffness as compared to conventional Al alloys. These alloys, however, have low fracture toughness and exhibit brittle intergranular fracture. The critical issue is to understand the interfacial characteristics of grain boundary phases, as these characteristics dictate the fracture toughness of Al-Li alloys. Transmission electron microscopy (TEM) and density functional theory (DFT) calculations were employed to investigate the nature of grain boundary precipitates, interfacial characteristics and fracture behavior of Al-Cu-Li containing a small amount of Mg and Ag. TEM studies showed that without Mg and Ag, T1 plates form at grain boundaries. However, the addition of small amount of Mg and Ag changes the nature of grain boundary precipitates. We will present the effect of Mg and Ag on grain boundary microstructure and the fracture behavior of an Al-Cu-Li alloy in detail.
||Planned: Light Metals Volume