Joint differential scanning calorimetry, electrical resistivity, and microhardness study of aging in two AlCuMg alloys

Two age-hardenable AlCuMg alloys (Cu 4.5 wt.% and Cu/Mg ratios of 2.5 and 8) were studied by electrical resistivity, differential scanning calorimetry, and microhardness measurements during natural and artificial aging at110 °C. The results were interpreted in terms of Guinier-Preston/Guinier-Preston-Bagariatskij zone formation followed by a modification in θ" and S" intermediate phases.