(Al90-Ni8-Zr2)(100-x)Mmx alloys were rapidly solidified by using melt spinning technique to study the effect of the Lanthanides content on microstructure and physical properties. The resulting melt spun ribbons were characterized by XRD, SEM, EDS, DSC, TEM and Vickers microhardness tester. Al90Ni8Zr2 alloy consists of amorphous and nanocrystalline α-Al with 30nm size phases. Other ribbons are completely amorphous, so glass forming ability increased by adding Mm. The change in microhardness is discussed and seen that the higher the Misch metal content, the higher the hardness of the ribbons. Phase transformation kinetic of amorphous to α-Al nanocrystals in alloy with 2 at% Mm discussed. Activation energy of this transformation determined by Kissinger method to be about 331.5 kJ/mol much higher than aluminum self-diffusion activation energy. Adding alloying elements increases energy required for devitrification of amorphous phase in aluminum glassy alloys.