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Fourth generation Ni-based superalloys are being developed for use as single crystal turbine blades in aero-engines. They contain between, approximately, 2–5 wt% Ru together with ~6 wt% Re and differing amounts of other refractory elements such as W, Ta and Mo. These alloys experience sub-surface pitting attack when oxidised in air at intermediate temperatures (~750 °C). The pits consist of γ′ particles...
Fourth-generation, Ru-bearing, Ni-base superalloys offer superior microstructural stability over previous generations, affording greater density-corrected creep strength, but in common with their predecessors, have only borderline ability to form and maintain a protective oxide layer. This is particularly so at intermediate temperatures of around 750 °C at which temperature internal oxidation can...
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