Abstract
The mechanical properties and ageing precipitation behavior of 7B04 aluminum alloy aged with direct current (DC) intensity of 0–400 A at 110–130 °C were investigated by tensile test, conductivity measurement, scanning electron microscope (SEM), differential scanning calorimetry (DSC) and field emission spherical aberration correction transmission electron microscope (STEM). The conductivity, tensile strength and elongation of peak aged alloy with DC were all higher than those of peak aged alloy without DC. With increasing ageing temperature from 110 °C to 130 °C, the DC intensity that required for achieving peak strength reduced from 200 A to 100 A. The enthalpy value of the endothermic peak, the size and area fraction of GP zones, and η′ of peak aged alloy increased with the increase of DC intensity. The alloy aged with DC intensity of 100 A at 120 °C for 12 h had the highest tensile strength and favorable ductility.
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