Abstract: A commercial AA2618 alloy was treated through melt spinning at rotating speeds of 20 and 40 m·s^-1. The as-melt spun ribbons were characterized by a combination of optical microscopy (OPM), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD). The microstructural evolution of the ribbons in a continuous heating process was investigated, and the microhardness was also measured under different conditions. It was found that Al_xFeNi is prone to precipitate in AA2618 alloy due to the minimal solubility of iron and nickel. Fine Al_xFeNi particles appeared along the grain boundaries at the chilling sides of as-melt spun ribbons, and at both the grain boundaries and in the interior of grains at the free sides. On continuous heating Al_xFeNi precipitated steadily and uniformly throughout the matrix until melting. The microhardness of as-melt spun ribbons decreased significantly from the chilling surfaces to free surfaces. Precipitation of Al_xFeNi lowered the hardness of the alloy.

Key words: melt spinning, AA2618, ribbon, microstructure

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