2013
DOI: 10.1179/1743284713y.0000000206
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Comparison of microstructural evolution in Pt aluminised Ni based superalloys with and without Ru

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 1100uC 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 … Show more

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Cited by 5 publications
(3 citation statements)
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“…As a matter of fact, a lot of previous work [20][21][22][23] is available concerning the interdiffusion behavior between diffusion aluminide coatings and superalloy matrix. Many factors have a great effect on the interdiffusion behavior, including crystal orientation [24,25], stress induced by surface treatment [25], alloy constitution [20,22] and so on. P and µ are the two dominant TCPs in SRZ [26,27].…”
Section: The Effect Of Bd Layer On Srz Formationmentioning
confidence: 99%
“…As a matter of fact, a lot of previous work [20][21][22][23] is available concerning the interdiffusion behavior between diffusion aluminide coatings and superalloy matrix. Many factors have a great effect on the interdiffusion behavior, including crystal orientation [24,25], stress induced by surface treatment [25], alloy constitution [20,22] and so on. P and µ are the two dominant TCPs in SRZ [26,27].…”
Section: The Effect Of Bd Layer On Srz Formationmentioning
confidence: 99%
“…Previous studies have shown both positive and negative effects of different alloying elements in the case of Pt-aluminized fourth generation Ni-based superalloys, e.g. Ru encourages SRZ nucleation [5], and Mo is an effective element in impeding SRZ formation [4]. However, these effects have been observed from various multicomponent Ni-based superalloys, with complex alloy compositions, and are not always consistent across alloy systems.…”
Section: Introductionmentioning
confidence: 96%
“…As the operating temperature increases and the environment becomes more aggressive, the oxidation and corrosion resistance of turbine blade materials becomes more crucial than before. Furthermore, inter-diffusion of alloy elements between a coating and a substrate becomes more important, as this will be very significant at higher temperature, and will accommodate microstructure changes during service, such as the formation of Secondary Reaction Zones (SRZs) [1][2][3][4][5][6] and Topologically Close-packed (TCP) phases [7]. The term 'SRZ' was suggested by Walston [1], and they were first observed in coated third generation Ni-based superalloys.…”
Section: Introductionmentioning
confidence: 99%