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  • Effect of Substrate Crystal Orientation on the Microstructure and Fracture Properties of Nickel Aluminide Coatings on Superalloys Subjected to TMF


Single crystal nickel-based alloys for blades of aero gas turbines are frequently provided with a nickel aluminide diffusion coating, which increase corrosion resistance. Thermomechanical fatigue (TMF) tests are used in the assessment of the performance of coated superalloys, as they simulate, under a controlled mechanical environment, the complex service conditions to which turbine blades are subjected.

Nickel aluminide diffusion coatings are more prone to fracture during out-of-phase than in in-phase cycling. However, a comprehensive understanding of the causes leading to their failure has not yet been reached, although both microstructural degradation and mechanical factors are known to be involved in coating damage. Neither is there a consensus as to the influence of the coating on the life of the whole component.

Additional information

Authors: OSTOLAZA K M, JRC Petten (NL);ARRELL D J, JRC Petten (NL);VALLÉS J L, JRC Petten (NL)
Bibliographic Reference: Paper presented: International Symposium on Fatigue under Thermal and Mechanical Loading, Petten (NL), May 22-24, 1995
Availability: Available from (1) as paper EN 39569 ORA
Record Number: 199610269 / Last updated on: 1996-03-18
Original language: en
Available languages: en