Abstract
Oxidation behavior of Ti-40Al-8 Nb alloys with nearly lamellar structure (as-HIP) and submicron (ω0 +γ) microstructure (as-HT) at 800 °C was comparatively investigated. Results showed that owing to the homogenous refined grains and high γ phase content in as-HT sample, a compact oxide scale with reduced thermal stress formed on its surfaces. Moreover, ω0 phase in the as-HT sample promoted the formation of Nb-rich pegs at oxide scale/substrate interface, which not only inhibited elements interdiffusion but also improved the bonding strength between oxide scale and substrate. As a result, the as-HT sample presented an enhanced oxidation resistance comparing to the as-HIP sample.
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