Abstract
Surface segregation of Pb in Al-0.13–13at.-ppm Pb foils and Fe in Al-6–140at.-ppm Fe foils after heat treatment was studied by Rutherford back-scattering spectroscopy (RBS) and transmission electron microscopy (TEM). The degree of segregation (segregated composition/foil composition) was greater than 1500 in the Al–Pb system but is less than 160 in the Al–Fe system. The maximum segregation temperature was 923K in the Al–Pb system, but was 723K in the Al–Fe system. Lead segregated not to the aluminum surface but to the oxide film. Iron, however, segregated at the aluminum surface, i.e., at the interface of the oxide film/aluminum matrix.
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