Investigation of Homogenization Treatment in Al- Li- Cu- Zr Alloys

Arash Rezaei; Shahram Ahmadi; Ali Shokuhfar; I. Foroutan

doi:10.4028/www.scientific.net/DDF.273-276.536

Paper Titles

Effect of Doping, Composite Geometry and Diffusion Annealing Schedules on the Structure of Nb₃Sn Layers in Nb/Cu-Sn Wires
p.514

Kinetics Parameters of Atomic Migration and Diffuse Scattering of Radiations within the F.C.C.-Ni–Al Alloys
p.520

Atomic-Ordering Kinetics and Diffusivities in Ni–Fe Permalloy
p.525

Al-Li Surface Alloying in the Electrolytic Method
p.531

Investigation of Homogenization Treatment in Al- Li- Cu- Zr Alloys
p.536

Effect of Antioxidants and Atmosphere on the Phase Formation and Microstructure of In Situ MgO-Al₂O₃ Spinels
p.542

Formation and Decomposition of Sol-Gel Synthesized Aluminum Titanate Nano Powders at the Presence of Fe₂O₃ Additive
p.549

Effect of Colloidal Silica and Nano Boehmite Mixture on Reaction Sintering, Microstructure and Physical Properties of Tialite
p.554

Nonclassical Properties of Molecular Diffusion in Liquids and Dense Gases
p.560

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Investigation of Homogenization Treatment in Al- Li- Cu- Zr Alloys

Abstract:

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.