Abstract
The mechanism of decomposition and its products were investigated by resistivity measurements and optical and electron microscopy. The existence of a new metastable phase (G') was established, besides the known Al6Mn and G phases. However, no sequence of precipitation was observed, in spite of the occurrence of metastable phases.The precipitation process seems to be mainly affected by the degree of difficulty in nucleation of these three phases. Accordingly, grain boundaries and dislocations can act as preferential nucleation sites and thus control the precipitation behavior of the alloys.
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