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The effect of annealing at 450oC on the microstructure of a deformed Cu-1.5Pd-3Ag (at.%)
Novikova O. S.
1, Volkov A. Yu.
1, Korkh Yu. V.
1, Cholakh S. O.
2, Kukharenko A. I.
1,2, Salamatov Yu. A.
1
1M.N. Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences, Yekaterinburg, Russia
2Ural Federal University after the first President of Russia B.N. Yeltsin, Yekaterinburg, Russia
2Ural Federal University after the first President of Russia B.N. Yeltsin, Yekaterinburg, Russia
Email: novikova@imp.uran.ru, volkov@imp.uran.ru, korkh@imp.uran.ru, s.o.cholakh@urfu.ru., a.i.kukharenko@urfu.ru., salamatov@imp.uran.ru
Experiments were performed in order to study the surface and microstructure of the Cu-1.5Pd-3Ag alloy after deformation and annealing at a temperature of 450oC for 48 hours with air cooling. It is shown that, after this treatment, silver is segregated on the alloy surface in the form of droplet-like particles that are well identified by atomic force microscopy and scanning electron microscopy. The particles lateral sizes are 0.1-0.5 μm, in some cases up to 1 μm. Experiment on X-ray photoelectron spectroscopy indicates that an oxide film with a thickness of no more than 10 nm is formed on the Cu-1.5Pd-3Ag alloy surface, which protects the sample from further oxidation over the its entire volume. According to X-ray diffraction analysis, it was found that, during annealing of the Cu-1.5Pd-3Ag alloy, fractions of two phases with different silver enrichment degrees are segregated: practically pure Ag and a compound close to Ag-31 at.% Pd. Keywords: copper-palladium-silver alloys, microstructure, X-ray diffraction analysis, X-ray photoelectron spectroscopy, scanning electron microscopy, atomic force microscopy.
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