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We study Al-1.74 at.% Cu as a typical binary model alloy to obtain new information on the precipitation sequence. The alloy has been solution heat treated, rapidly quenched, and then isochronally annealed up to 540 °C. We reveal new effects on the evolution of the precipitation sequence by combining positron annihilation lifetime and coincidence Doppler broadening spectroscopies. Positron parameters do very sensitively respond to changes in the type of precipitates present. We find that in the as-quenched state after exposing the alloy
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