The microstructure of binary Al 100-x -Mg x (x = 10, 15, 18 and 25 wt%) alloys after long anneals (600-4000 h) was studied between 210 and 440°C. The transition from incomplete to complete wetting of Al/Al grain boundaries (GBs) by the second solid phase Al 3 Mg 2 has been observed. The portion of completely wetted GBs increases with increasing temperature beginning from T wsmin = 220°C. Above T wsmax = 410°C all Al/Al GBs are completely wetted by the Al 3 Mg 2 phase.

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