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ChemInform Abstract is determined in the range 0-1.5 wt.% Mn and 0-10 wt.% Al using such special sampling techniques as centrifuging and rapid quenching. The microstructure analysis includes XRD and microprobe analysis. The results show that the solubility of Mn decreases rapidly with increasing Al concentration and increases with increasing temperature. Among the equilibrium phases detected (β-Mn(Al), η-Al8Mn5, Al11Mn4) η-Al8Mn5 is the main intermetallic phase in molten Mg containing 4-10 wt.% Al. β-Mn(Al) is the quilibrium phase in alloys with 4 wt.% Al above 730 rc C and in alloys with 0.8 wt.% Al. Al11Mn4 is the equilibrium phase below 670 rc C in Mg-10 wt.% Al-Mn. During cooling to 20 rc C ε-AlMn is formed together with the Al-rich phases Al6Mn, Al4Mn, Al11Mn4, and -Al8Mn5.

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