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THE EFFECT OF Nb ON THE OXIDATIONBEHAVIOR OF TiAl ALLOY AT HIGH TEMPERATURE |
Xiaoying Cheng;Xiaojing Wan;Jianian Shen |
上海大学材料所 |
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Abstract The oxidation behavior of a Ti45Al10Nb allo y has been studied in oxygen and air atmosphere at 800~960℃.It was shown that th e alloy is better than Ti-50Al alloy in oxidation resistance.The oxidation rate in weight gain of Ti45Al10Nb is comparable to or even better than that of ox id ation resistant steel.It was also found that the rate of oxidation in air decrea ses obviously than that in pure oxygen.Based on the result of X-ray or EDS analy sis,the oxide scales consist of TiO2 and Al2O3,but TiN was identified in the scale tested in air.It was concluded that TiN in the scale,which was stabili zed by Nb,was responsible for the decreased rate of oxidation in air.
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Received: 03 December 2001
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Corresponding Authors:
Xiaoying Cheng
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