Investigation of Homogenization Treatment in Al- Li- Cu- Zr Alloys
Aluminum-Lithium alloys were developed as major replacements for existing aluminum alloys to reduce the weight of aircraft and aerospace structures. Mechanical properties of Al-Li alloys greatly depend on solidification conditions. Other than reducing the microsegregation, homogenization treatment has other effects on the microstructure of Al-Li ingots. In this research, effects of homogenization treatment at constant temperature (500°C) on the precipitation in the microstructure of Al-1Li-3Cu-0.1Zr (wt %) and Al-2Li-3Cu- 0.1Zr (wt %) specimens have been investigated. Results show that homogenization at 500°C for 24 hours not only increases the hardness and phases precipitating in grain but also reduces microsegregation of Fe in grain boundaries.
Andreas Öchsner and Graeme E. Murch
A. Rezaei et al., "Investigation of Homogenization Treatment in Al- Li- Cu- Zr Alloys", Defect and Diffusion Forum, Vols. 273-276, pp. 536-541, 2008