INTERNAL OXIDATION OF Fe3Al DURING HIGH TEMPERATURE OXIDATION
来源期刊：中国有色金属学报(英文版)1998年第1期
论文作者：Wang Yonggang He Yedong Zhu Rizhang
文章页码：52 - 55
Key words：Fe3Al; oxidation; internal oxidation; corrosion
Abstract: The oxidation behavior of Fe3Al at 1 000℃in air was studied by thermobalance, scanning electron microscope (SEM) and X-ray diffraction (XRD). It was found that the oxidation kinetics approximately follows the parabolic law; the oxide scale consists of Al2O3 and a little amount of Fe2O3; and there occurs transgranular internal oxidation. Based on the analyses of the oxide scale and the matrix, an internal oxidation model was proposed, which considers the effect of the long-range ordered structure of Fe3Al on its hightemperature oxidation. The long-range ordered structure reduces the activity of Al in Fe3Al, thus reducing the diffusion coefficient of Al in the matrix. Consequently, in the oxidation process, the matrix surface will be seriously depleted in Al and then there occurs internal oxidation.
