Abstract
The microstructural evolutions in two Pt aluminised Ni based single crystal superalloys were compared to explore the effect of Ru. Ni based single crystal superalloys containing 0 and 3 wt-%Ru were Pt aluminised and isothermally exposed at 1100°C for 500 h. The 0 wt-%Ru alloy showed sporadic secondary reaction zone (SRZ) formation after aluminisation, whereas the 3 wt-%Ru alloy developed a continuous SRZ. During exposure, the 3 wt-%Ru alloy retained a continuous SRZ, while the 0 wt-%Ru alloy developed voids in the coating layer in addition to sporadic SRZ formation. The 3 wt-%Ru alloy showed a deeper penetration of the SRZ after exposure, almost double that of the 0 wt-%Ru alloy, and demonstrated numerous nucleation sites within the SRZ layer, growing continuously under the interdiffusion zone (IDZ). In contrast, the 0 wt-%Ru alloy showed a layer of retained substrate between the SRZ and IDZ, formed due to sporadic nucleation associated with defects in the coating and the growth of the coating from these sites. Ru additions to coated Ni based single crystal superalloys encourage nucleation of the SRZ in the 3 wt-%Ru alloy.
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