A Calorimetric Study on the Precipitation of T1 Phase during the Ageing of an Al-Li-Cu-Zr Alloy

Shahram Ahmadi; Ali Shokuhfar; M.R. Abotalebi; Arash Rezaei

doi:10.4028/www.scientific.net/DDF.273-276.14

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HomeDefect and Diffusion ForumDefect and Diffusion Forum Vols. 273-276A Calorimetric Study on the Precipitation of T1...

A Calorimetric Study on the Precipitation of T₁ Phase during the Ageing of an Al-Li-Cu-Zr Alloy

Abstract:

The precipitation of T1 phase during the ageing of an Al- Li- Cu -Zr alloy sheet was studied by DSC (Differential Scanning Calorimetric) technique. Results showed that precipitation of T1 phase occurred in temperature range of 250°C to 300°C whereas its dissolution occurred within the temperature of 450°C to 530°C. Furthermore, activation energies for precipitation and dissolution of T1 phase were determined 122.1 kJ/mol and 130.3 kJ/mol, respectively.