The mechanism of formation of G.P. zones and γ′ precipitate, as revealed by electron microscopy, is reported for a range of copper–beryllium alloys. Individual zone images were obtained for alloys of lower Be content. The γ′ precipitate is nucleated by G.P. zones when these are present. Above the G.P. zone solvus (∼ 320° C) γ′ is heterogeneously nucleated.
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