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                <term xml:lang="en">High Ta contents</term>
                <term xml:lang="en">High temperature oxidation</term>
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              <p>In this work six refractory nickel and cobalt-based cast alloys rich in chromium and designed to be strengthened by tantalum carbides were cast in controlled atmosphere. Samples were especially prepared to investigate their surface behavior in synthetic air at 1250°C for three days. Their oxidized states were first characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM) on surface prior to following metallography processing. Second, oxides and subsurfaces were examined by SEM and energy dispersion spectrometry (EDS) on cross-sections. Results show that the surface and subsurface deterioration by oxidation clearly depend on the relative quantities in Ni and Co in the chemical composition of the alloys. All alloys rather well resisted oxidation due to their chromium contents but beginnings of catastrophic oxidation were noticed for the alloys containing much more cobalt than nickel. Tantalum, present with particularly high contents, played an important role in the oxidation phenomena, notably on the adherence of the external scale, as well as on the carbides population by favoring highly stable heat-resistant TaC carbides, the fraction of which is governed by the base element.</p>
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