Hot-compression behavior of Al alloy 5182

Abstract

Hot-compression of aluminum alloy 5182 was carried out on a Gleeble-1500 thermo-simulator at deformation temperature ranging from 350 °C to 500 °C and at strain rate from 0.01 s⁻¹ to 10 s⁻¹ with strain range from 0.7 to 1.9. The microstructures and macro-textures evolution under different conditions were investigated by polarized optical microscopy and X-ray diffraction analysis, respectively. The basic trend is that the hot-compression stress increases with the decrease of temperature and increase of strain rate, which is revealed and elucidated in terms of Zener-Hollomon parameter in the hyperbolic sine equation with the hot-deformation activation energy of 143.5 kJ/mol. An empirical constitutive equation is proposed to predict the hot-deformation behavior under different conditions. As deformation temperature increases up to 400 °C, at strain rate over 1 s⁻¹, dynamic recrystallization (DRX) occurs. Cube orientation {100}〈001〉 is detected in the recrystallized sample after hot-compression.

Keywords

aluminum alloy 5182 / hot-compression / texture / microstructure

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