Initial Stages of Oxidation of Copper and Copper-iron Alloy
نویسندگان
چکیده
The initial oxidation stages of copper and copper-iron alloys have been studied by the AtomProbe Field Ion Microscope (AP-FIM). The depth profiles of copper oxide formed in-situ were successfully determined. The composition of the oxide was close to the value of Cu20, but a large concentration fluctuation was found. The interface between the oxide and the metal was found to be diffuse, the width of which was approximately 2 nm. Annealing the supersaturated Cu-1.2at%Fe alloy tip in-situ a t 1000 K in UHV caused enrichment of the surface in iron atoms due to heterogeneous precipitation. No indication of surface segregation was found in Cu-O.OGat%Fe or aged Cu-1.2at%Fe alloys. In-situ oxidation of the supersaturated Cu-l.2at%Fe alloy led to the formation of both external and internal oxides of iron.
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