The commercial AA2618 alloy was treated through melt spinning at rotation speeds of 20 and 40 ms(-1), respectively. The melt-spun ribbons were characterised by a combination of optical microscopy (OPM), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD). Microstructural evolution of ribbons in the continuous heating process was investigated. Microhardnesses of samples treated under different conditions were measured. It was found that due to the low solubilities of iron and nickel AlxFeNi was very prone to precipitate in AA2618 alloy. At chilling sides of melt-spun ribbons fine AlxFeNi particles presented along the grain boundaries, while at free sides AlxFeNi presented not only along the grain boundaries but also in the interior of grains. The microhardnesses of melt-spun ribbons decreased significantly from chilling surfaces to free surfaces. During heating AlxFeNi precipitated uniformly throughout the matrix until melting, which was one of the reasons responsible for the lowering of hardness.