Platinum Diffusion and Microstructure Change in a Single Crystal Superalloy and Nickel-Based Model Alloys at 1000°C

Stewart Ford; Shigenari Hayashi; Toshio Narita

doi:10.4028/www.scientific.net/MSF.595-598.69

Paper Titles

Effect of Material and Environmental Parameters on the Microstructure Evolution and Oxidation Behavior of a Ni-Based Superalloy Coated with a Pt-Modified Ni-Aluminide
p.33

Elaboration of Nickel Aluminide Diffusion Coatings: Application to Oxidation Resistance
p.41

Rumpling of Platinum Modified Aluminide Coatings during Thermomechanical Testing
p.51

The Kinetics of Oxidation of Ru-Bearing Nickel-Based Superalloys
p.59

Platinum Diffusion and Microstructure Change in a Single Crystal Superalloy and Nickel-Based Model Alloys at 1000°C
p.69

Comparison of the Thermal Cycling Performance of Thermal Barrier Coatings under Isothermal and Heat Flux Conditions
p.77

Influence of Micro-Structure on Oxidation Behavior of a Ni-Based Superalloy at 1000°C
p.87

Short-Time Oxidation of a NiAl(Zr) Bond Coat Thermochemically Deposited on a Nickel-Based Superalloy
p.95

Oxide Spallation in Beta-NiAl Coated Systems under Mechanicalloading
p.101

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Platinum Diffusion and Microstructure Change in a Single Crystal Superalloy and Nickel-Based Model Alloys at 1000°C

Abstract:

Single crystal superalloy TMS82+ and model alloys of Ni-12Al and Ni-6Cr-8Co-12Al were electroplated with 5-6μm of platinum and heat treated at 1000°C for up to 100hrs. In the model alloys the platinum concentration gradient in the interdiffusion region caused uphill diffusion of aluminium. The subsequent surface enrichment led to formation of aluminium-rich γ′ phase. In TMS82+ superalloy inward diffusion of platinum resulted in loss of the γ/γ′ microstructure and formation of new γ and γ′ grains. The initial dissolution of the γ′ cubes was due to the outward diffusion of aluminium. Again, the presence of a platinum gradient in the interdiffusion region resulted in uphill diffusion of aluminium and a net increase in aluminium content at the alloy surface, leading to a near-surface single-phase γ′ layer being formed, however topologically close-packed (TCP) phase formation was not observed.