Oxidation behavior of Ti-Nb-Mo-Al-Six refractory high entropy alloy at 1000℃

作者：Li Zhe; Wang Liang; Wang Binbin; Li Zhaobo; Li Zhiwen; Zhang Yong; Luo Liangshun; Chen Ruirun; Su Yanqing; Guo Jingjie

来源：Corrosion Science, 2022, 206: 110504.

DOI：10.1016/J.CORSCI.2022.110504

• Refractory high entropy alloy
• Eutectic structure
• Oxidation
• Parabolic law
• Mo evaporation

The oxidation behavior of TiNbMo0.5Al0.225Six (x?=?0.1, 0.25, 0.4, 0.55) refractory high entropy alloys in air at 1000?℃ was investigated. These novel alloys have a BCCss / (Nb, Ti)5Si3 eutectic structure in the as-cast state. Oxidation resistance results reveal that the mass gain shifts from a mass loss (Si0.1) to a parabolic law (Si0.25, Si0.4, Si0.55). An appropriate increase in Si content favors a lower oxidation rate. The β-(Nb, Ti)5Si3 was studied to have excellent oxidation resistance, while the region where γ-(Nb, Ti)5Si3 existed is the main site of porosity generation. The suitable Si content promotes the appearance of a Mo-rich layer, thus preventing the oxide evaporation.(#br)Data availability(#br)The data that support the findings of this study are available from the corresponding author, specifically Professor Liang Wang of the Harbin Institute of Technology (email: [e-mail]) upon reasonable request.

• 单位
  哈尔滨工业大学