| 【文章摘要】 <正>The effect of melt over-heating on the morphology of AlgFeNi phase in 2618 aluminum alloy with high contents of Fe and Ni and 0.22wt.% zirconium, has been investigated by optical microscopy, SEM and TEM. The mechanical properties of 2618 aluminum alloy after hot extrusion and quenching/aging have been tested. The results show:melt over-heating treatment of 2618 alloy with high contents of Fe and Ni at 960℃led to finer and better-distributed needle-like AlgFeNi phase in cast micro structure and fine AlgFeNi particles after hot extrusion; the grain size of the alloy after hot extrusion could also be refined evidently by alloying of zirconium; the ambient and high temperature tensile strength and elongation of 2618 alloy have been apparently enhanced due to fine AlgFeNi particles and dispersed Al3 Zr as well as fine grain size. |