Rumpling of Platinum Modified Aluminide Coatings during Thermomechanical Testing

Sébastien Dryepondt; David R. Clarke

doi:10.4028/www.scientific.net/MSF.595-598.51

Paper Titles

Improvement of High-Temperature Oxidation of Titanium Alloys by Dipping in a Phosphoric Acid Solution
p.17

Development of a NiW In Situ Diffusion Barrier on a Fourth Generation Nickel-Base Superalloy
p.23

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

HomeMaterials Science ForumMaterials Science Forum Vols. 595-598Rumpling of Platinum Modified Aluminide Coatings...

Rumpling of Platinum Modified Aluminide Coatings during Thermomechanical Testing

Abstract:

The evolution in surface morphology of platinum modified nickel aluminide (Ni,Pt)Al oxidation coatings during thermo-mechanical testing has been evaluated. One type of test consisted of cyclic oxidation between an upper temperature of 1150°C and a lower temperature varying from room temperature to 1050°C. The other type of test was cycling between 1000°C/1150°C under an applied compressive stress. Profilometry using optical interferometry was used to quantify the surface “rumpling”. First and second-order statistical parameters including RMS roughness and the auto-correlation function were calculated from the profilometry measurements. The results indicate that the grain structure of the aluminide coating plays a major role in the early stages of rumpling and set its wavelength. Also, the superimposed compressive stress during thermal cycling leads to an asymmetry in the rumpling pattern with respect with the loading axis as well as cracking along the applied stress direction.