This study explores reducing the oxygen content of a commercial Ti-48Al-2Cr-2Nb powder to less than 400 ppm by deoxidation in the solid state (DOSS) using Ca vapor, and investigates the effect of Ca vapor on the surface chemical state. As the deoxidation temperature increases, the oxygen concentration of the Ti-48Al-2Cr-2Nb powder decreases, achieving a low value of 745 ppm at 1100°C. When the deoxidation time is increased to 2 h, the oxygen concentration decreases to 320pp m at 1100°C, and the oxygen reduction rate is approximately 78% compared to that of the raw material. The deoxidized Ti-48Al-2Cr-2nb powder maintains a spherical shape, but the surface shape changes slightly owing to the reaction of Ca and Al. The oxidation state of Ti and Al on the surface of the Ti-48Al-2Cr-2Nb powder corresponds to a mixture of TiO₂ and Al₂O₃. As a result, the peaks of metallic Ti and Ti suboxide intensify as TiO₂ and Al₂O₃ in the surface oxide layer are reduced by Ca vapor deposition

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• Production of spherical TiAl alloy powder by copper-assisted spheroidization
  Jin Qian, Bo Yin, Dashun Dong, Geng Wei, Ming Shi, Shaolong Tang
  Journal of Materials Research and Technology.2023; 25: 1860.     CrossRef
• Ca-Mg Multiple Deoxidation of Ti-50Al-2Cr-2Nb Intermetallic Compound Powder for Additive Manufacturing
  Seongjae Cho, Taeheon Kim, Jae-Won Lim
  ECS Journal of Solid State Science and Technology.2022; 11(4): 045008.     CrossRef