|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Aluminum Alloys, Processing and Characterization
||Grain Boundary Precipitation and Fracture Behavior of Al-Cu-Li Alloys
||Ramasis Goswami, Noam Bernstein
|On-Site Speaker (Planned)
Several microstructural factors have been proposed to explain the intergranular fracture exhibited by Al alloys, including grain boundary precipitates (GBPs) and precipitate free zones (PFZs), Li segregation at grain boundaries, and planar slip producing high stress concentration at grain boundaries. However, it has recently been shown that the grain boundary microstructural features rather than slip characteristics are mostly responsible. We present here the nature of grain boundary precipitate, interfacial characteristics of precipitate matrix interface at grain boundary and the segregation behavior using transmission electron microscopy (TEM) of 2nd and 3rd generation Al-Li alloys. The density functional theory (DFT) calculations were employed to investigate the interfacial characteristics and fracture behavior. We will discuss in this presentation the effect grain boundary microstructure on the fracture behavior.
||Planned: Light Metals