Air Oxidation Behavior of Two Ti-Base Alloys Synthesized by HIP

Abstract

The oxidation behavior of Ti-5Al-2.5Sn and Ti-6Al-4V produced by hot isostatic pressing (HIP) has been studied at 650–850°C in air for 24 h. The oxidation kinetics of both alloys followed the parabolic law with good approximation, except for Ti-5Al-2.5Sn oxidized at 850°C. Multi-layered scales formed on both alloys at 750°C and 850°C. Ternary additions of Sn and V accounted for the different morphology of the scales formed on these two alloys. In addition, the oxidation behavior of HIP alloys is compared with that of the corresponding cast alloys and the scaling mechanism is discussed.

Keywords

• ti-5al-2.5sn
• ti-6al-4v
• hip
• oxidation
• 81.16 pr
• 81.20.ev
• 81.70.pg