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《Journal of Chinese Society For Corrosion and Protection》 2002-02
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THE EFFECT OF Nb ON THE OXIDATION BEHAVIOR OF TiAl ALLOY AT HIGH TEMPERATURE

CHENG Xiaoying,WAN Xiaojing,SHEN Jia′nian (Institute of Materials Research,Shanghai University,Shanghai 200072)  
The oxidation behavior of a Ti-45Al-10Nb alloy has been studied in oxygen and air atmosphere at 800~960℃.It was shown that the alloy is better than Ti-50Al alloy in oxidation resistance.The oxidation rate in weight gain of Ti-45Al-10Nb is comparable to or even better than that of oxidation resistant steel.It was also found that the rate of oxidation in air decreases obviously than that in pure oxygen.Based on the result of X-ray or EDS analysis,the oxide scales consist of TiO 2 and Al 2O 3,but TiN was identified in the scale tested in air.It was concluded that TiN in the scale,which was stabilized by Nb,was responsible for the decreased rate of oxidation in air.
【Fund】: 国家自然科学基金重大项目 5 9895 15 7;; 上海市青年基金项目 98QN46资助
【CateGory Index】: TG172.82
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