Precipitates of the metastable ‐phase grown in an Al‐(6.8 at.%)Zn alloy are investigated by means of a technique of high resolution electron microscopy, namely by two‐beam lattice fringe imaging with tilted illumination. It is demonstrated by this direct method that the ‐precipitates are in fact semicoherent. The transition of fully coherent Guinier‐Preston zones into semicoherent precipitates of the ‐phase takes place by formation of additional (III)rh and { III }rh planes inside the zones.
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Ramlau et al. (1986) studied this question.
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