Exceptional high-temperature oxidation resistance and mechanisms of a novel chemically complex intermetallic alloy

作者：Hou, Jinxiong; Gan, Jie; Li, Wanpeng; Tian, Hongzhou; Luo, Xier; Ju, Jiang; Zhou, Yinghao; Liu, Shaofei; Yao, Hongwei; Chen, Zhenghao; Yang, Tao^*

来源：Corrosion Science, 2023, 225: 111607.

DOI：10.1016/j.corsci.2023.111607

• Intermetallic alloys
• Oxidation resistance
• Microstructures
• Oxidation mechanisms

A novel chemically complex intermetallic alloy (CCIMA) dominated with an ordered L12 structure was designed based on the multicomponent Ni-Co-Cr-Al-Mo-Ti-Ta-Nb-B system. Its oxidation behaviors and underlying mechanisms were systematically investigated. Oxidation at 900 degrees C and 1000 degrees C results in the formation of main multicomponent spinel oxides in the outmost layer, spinel oxides containing rutile-type oxides and boron oxides in the intermediate layer, and continuous Al2O3 in the inner layer. Furthermore, oxidation leads to phase transformation from L12 to D024 at the matrix/oxide layer interface due to Al-depletion. The continuously formed inner Al2O3 oxides have well protected the alloy from oxidizing.

• 单位
  中国科学院