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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 at 110°C. The results were interpreted in terms of Guinier-Preston/Guinier-Preston-Bagariatskij zone formation followed by a modification in Љ and SЉ intermediate phases.

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The decomposition of a technical Al-based alloy (Zergal 4) has been studied by positron annihilation techniques. The observed dependence of annihilation characteristics on the aging time is attributed to a change in the positron state due to the transformation of Guinier-Preston zones into semicoherent eta ' particles. Predictions based on the Lifshitz-Slyozov-Wagner precipitation theory are in excellent agreement with the experiment data.