By adding Ni, Cr, and Zr to the Si-Al-Fe system and using a higher surface velocity of the copper wheel of 63 m/s, the composition range of an amorphous single phase was extended to 60 at% Si. An amorphous Si 6 0 Al 1 8 Fe 1 2 Ni 4 Cr 3 Zr 3 alloy was produced. The amorphous phase in the Si-Al-TM (TM = transition metals) alloys shows higher thermal stability than in the Al-Si-TM alloys. By the shift of differential scanning calorimetry (DSC) peaks with change of heating rate, the activation energy for the transformation was determined to be 343 kJ/mol for Si 5 5 Al 2 0 Fe 1 0 Ni 5 Cr 5 Zr 5 alloy and 374 kJ/mol for Si 5 0 Al 2 5 Fe 1 0 Ni 5 Cr 5 Zr 5 alloy.