2024/06/18 by C. Billard, Billard, Capucine, D. Texier +15
Engineering · #Applied Physics (physics.app-ph) #FOS: Physical sciences #High Temperature Alloys and Creep #High-Temperature Coating Behaviors #Intermetallics and Advanced Alloy Properties #Materials Science (cond-mat.mtrl-sci)
paper · pdf · doi:10.48550/arxiv.2406.13070
openalex publication_date 2024/06/18 · openalex created_date 2024/06/22 · openalex updated_date 2026/07/28
The brittleness of an aluminide diffusion coating protecting a René 125 Ni-based polycrystalline superalloy was investigated over a wide range of temperatures in its as-received and thermally aged form. Isothermal and thermal cycled aging were performed on the coated system at a maximum temperature of 1100 °C. Microstructure evolutions and damage initiation within the coating were characterized. Interrupted tensile tests and thermomechanical fatigue tests were conducted to document critical stress-strain conditions leading to the coating cracking and lifetime for the case of thermo-mechanical fatigue loading. Advanced digital image correlation and acoustic emission techniques were used to detect coating cracking. Isothermal oxidation or cyclic oxidation led to improved strain-to-failure due to metallurgical evolutions and also longer fatigue life under thermomechanical fatigue conditions.