Effect of Mo, Ta, and Re on high-temperature oxidation behavior of minor Hf doped β-NiAl alloy

• DOI: 10.1016/j.corsci.2015.10.011
• Publication Date: 2015-10-23T20:11:49Z
• Authors: Baohong Han; Yue Ma; Hui Peng; Lei Zheng; Hongbo Guo
• Keywords: 02 engineering and technology; 0210 nano-technology

Abstract The microstructure and cyclic oxidation behavior of minor Hf-doped NiAl alloys with addition of different alloying elements including Mo, Ta, and Re were investigated. Co-precipitation of Ta and Hf as well as Re and Hf occurred during alloy preparation, whereas Mo and Hf precipitated individually into different phases. Over 0.5 at.% addition of Mo, Ta and Re had negative influence on the oxidation behavior of β-NiAlHf alloy, while the effect could be ignorable once the concentration reduced to less than 0.05 at.%. The interaction mechanism between Ta and Hf as well as Re and Hf was discussed.