Abstract
It has been known that Al-Mg-Ge alloy shows the similar precipitation sequence to Al-Mg-Si alloy, and its equilibrium phase is β-Mg2Ge according to its phase diagram. In this study, the precipitation sequence of Al-Mg-Ge alloys containing different contents of Mg2Ge has been investigated by hardness test, TEM and HRTEM observation to understand the effect of Mg2Ge contents on age-hardening behavior of these alloys. The hardness of as-quenched and peak-aged samples was improved by increasing Mg2Ge contents. There was no big difference between peak hardness of the alloys with higher Mg2Ge contents aged at 423, 473 and 523 K, which was different from the result of the alloys with lower Mg2Ge contents. The precipitates in the peak-aged samples were classified as some metastable phases, i.e. the β’-phase and parallelogram-type precipitates by HRTEM observation. The relative frequency of these precipitates in the matrix changed with Mg2Ge contents.
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