PHASES α AND β OF THE Al-Mn-Si SYSTEM
The fields of homogeneity and the crystal structures of threefold α and β phases on the basis of Al9Mn2Si and Al9Mn3Si at 823 K were investigated by methods of scanning electronic microscopy, X-ray and electron probe microanalysis. It was established that the а phase is formed in the field 7,4-15,9 % Si at manganese concentration ~18 ат. %. The ß phase has area of homogeneity from 3,7 to 18,5 аt. % Si and settles down in parallel Al-Si side at concentration of manganese 24-26 %. The fragment of isothermal section of the Al-Mn-Si system in the field of the alloys rich with aluminum was constructed.