Abstract
In this study, Ni based superalloy powders (75% Ni, 20% Cr, 4% Al2O3, 0.6% Ti and 0.4% Y2O3), were mechanically alloyed for up to 8 h and were compacted and sintered at 1200°C. Sintered samples were hot-deformed at 1200°C for various amounts and secondary recrystallisation was applied at 1325°C for 1 h. Isothermal oxidation tests were conducted at 1000°C for up to 100 h in air. Surface morphology, fractured surface and chemical composition of the samples were analyzed by using x-ray diffraction (XRD) and scanning electron microscopy (SEM). Cr2O3 film formed on the surface of the samples after exposure in air. Weight change results indicated the samples gained a small weight by increasing the exposure time. All samples exhibited sub-parabolic oxidation behavior. Key words: Mechanical alloying, powder metallurgy, oxidation, microstructure,superalloy.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
