Abstract
The structural changes during age hardening were investigated in a high purity aluminum alloy containing 6 pet Zn and 2 pet Mg by means of X-ray diffraction and dilatometry. It was found that when aging at low temperatures (up to 200°C) the precipitate which formed was MgZn2; above 300°C, (AlZn)49Mg32; at intermediate temperatures both phases formed. The precipitation at low temperatures started with the formation of Guinier-Preston zones in the (111) planes, followed by the formation of a transition lattice very similar to MgZn2 but with a = 4.96 and c = 8.68; this was replaced eventually by MgZn2. The dilatometric work confirmed the X-ray results; the length changes determined experimentally coincided with the changes calculated for the foregoing transformations.
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