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| High Temperature Oxidation Behavior of Directional Solidification NiAl–28Cr–5.94Mo–0.05Hf–0.01Ho Eutectic Alloy |
| WANG Zhensheng1,2, ZHOU Lanzhang2, GUO Jianting2, LIANG Yongchun2, HU Zhuangqi2 |
1.School of Electromechanical Engineering, Hunan University of Science and Technology, Xiangtan 411201
2.Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016 |
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Cite this article:
WANG Zhensheng ZHOU Lanzhang GUO Jianting LIANG Yongchun HU Zhuangqi. High Temperature Oxidation Behavior of Directional Solidification NiAl–28Cr–5.94Mo–0.05Hf–0.01Ho Eutectic Alloy. Chin J Mater Res, 2010, 24(6): 585-591.
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Abstract The isothermal oxidation behavior of NiAl–28Cr–5.94Mo–0.05Hf–0.01Ho directional eutectic alloy in the temperature range of 900–1150 was investigated. The results revealed that a continuous Al2O3 scale was formed and owned excellent oxidation resistance. Trace rare earth element Ho distributed uniformly at the alloy, together with refining structure and relatively high content of Al of Cr(Mo) phase by directional solidification (DS) process are beneficial to the formation of continuous Al2O3 coatings. During the oxidation of NiAl–28Cr–5.94Mo–0.05Hf–0.01Ho directional eutectic alloy, a phase transformation from θ–Al2O3 to α–Al2O3 was found on the surface of oxidation film, and it resulted in the abnormal oxidation mass gaining when the alloy oxided at 1000oC.
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Received: 01 April 2010
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