Superplastic Behavior of an AA2139 Subjected to ECAP

Abstract:

An AA2139 alloy belonging to Al-Cu-Mg-Ag system was subjected to thermomechanical processing (TMP) included solution treatment at 525°C for 1 h, quenching in water, over-aging at 380°C for 3 h followed by equal-channel angular pressing (ECAP) at 250°C to a total strain of ~12 via route B_C. This TMP produced a partially recrystallized structure with fine crystallites having an average size of ~0.9 μm and a fraction of high-angle boundaries of ~56%. Tensile test was performed in the temperature interval 300-500°C at initial strain rates ranging from ~1.8×10^-4 to ~1.7×10^-1 s^-1. It was shown that the highest elongation-to-fracture of ~660% appears at a temperature of 400°C and an initial strain rate of 1.4×10^-3 corresponding with the coefficient of sensitivity coefficient, m, of 0.34.

• Periodical: Materials Science Forum (Volumes 838-839)
• Pages: 373-378
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.838-839.373
• Online since: January 2016
• Authors: Marat Gazizov*, Rustam Kaibyshev
• Keywords: Aluminium Alloy, Equal-Channel Angular Pressing, Microstructure, Superplasticity

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