Abstract
The microstructure of graphite spherulites (G.S.) in nodular cast irons doped with either Ce or (Mg + Ce) has been extensively studied using transmission electron microscopy (TEM), μ-diffraction and lattice images techniques. The results show that the section of a well-developed G.S. consists of fan-like areas formed from platelets with sizes ranging from several to tens nm radial and hundreds nm circumferential. The [001] direction of the graphite platelets within each fan-like area tends to parallel to the radius of the G.S. but spreads about ± 10° among them. 002 Lattice images of graphite reveal the arrangement of graphite based plane layers, such as branching, bending and stages with intercalary layers besides dislocations and faults. These structural characteristics of G.S. have shown that {001} planes of graphite did grow predominatly through the formation of stages by intercalary layers of ceriumoxide and ceriumoxysulfide, then the G.S. takes its final morphology.
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