Gurugubelli, R.C.Balla, V.K.Rajasekaran, B.Krishna, P.Bontha, S.2026-02-042024Materials Letters, 2024, 361, , pp. -0167577Xhttps://doi.org/10.1016/j.matlet.2024.136078https://idr.nitk.ac.in/handle/123456789/21179This study investigates high-temperature oxidation behavior and kinetics of Laser Directed Energy Deposited (LDED) Ti-48Al-2Cr-2Nb (Ti-48-2-2) alloy at 750 °C, 850 °C, and 950 °C, for 30, 60 and 100 h. Results reveal that the oxide-scale consists of alternating bands of TiO<inf>2</inf> and Al<inf>2</inf>O<inf>3</inf> and its stability is strongly dependent on the oxidation temperature and duration. At 850 °C and 950 °C, the oxide-scale delaminated following 100-h exposure. LDED Ti-48-2-2 exhibited an oxidation rate constant of 0.984 mg2 cm−4 h−1 at 850 °C (100 h) and 2.09 mg2 cm−4 h−1 at 950 °C (100 h), and an activation energy of 83.7 kJ mol−1 (850°–950 °C). LDED Ti-48-2-2 exhibited poor oxidation resistance compared to conventionally processed Ƴ-TiAl alloys. This can be attributed to the absence of N-rich layer and the typical nano-scale α<inf>2</inf>/γ banded lamellar microstructure observed in other processing routes. Post-process heat treatments can be utilized to obtain the desired microstructural features. © 2024 Elsevier B.V.Activation energyAluminaAluminum alloysAluminum oxideChromium alloysIntermetallicsNanotechnologyNiobium alloysOxidation resistanceRate constantsThermooxidationTitanium alloysTitanium dioxide950° CDirected energyHigh temperature oxidation BehaviorIntermetallic alloys and compoundsLaser processMg 2Oxidation kineticsOxidation temperatureOxide scale3D printing