SURFACE REACTION OF Fe_3Al WITH WATER VAPOUR OR OXYGEN

Acta Metall Sin

1995, Vol. 31

Issue (16): 183-187 DOI:

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SURFACE REACTION OF Fe_3Al WITH WATER VAPOUR OR OXYGEN

WAN Hiaojing; ZHU Jiahong; HUANG Shengbiao(Shanghai University; Shanghai200072)(Manuscript received 1994-09-05)

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WAN Hiaojing; ZHU Jiahong; HUANG Shengbiao(Shanghai University; Shanghai200072)(Manuscript received 1994-09-05). SURFACE REACTION OF Fe_3Al WITH WATER VAPOUR OR OXYGEN. Acta Metall Sin, 1995, 31(16): 183-187.

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Abstract The kinetics of surface reaction of Fe3Al with water vapour or oxygen was investigated using AES and XPS. Both reactions are very rapid and initiate after 1.5×100-6 Pa·s exposure. The reaction of Fe3Al with water vapour saturates after an exposure of 1×10-4 Pa·s and the oxide formed is Al2O3, the reaction of Fe3Al with oxygen shows an initial saturation after an exposure of 1.5×10-5 Pa·s, followed by a further stage of reaction. These two stages were supposed to correspond to the oxidation of Al and Fe respectively. The kinetics of these reactions can be used to explain the different ductility behaviour of aluminides in various environments. (Correspondent: WAN Hiaojing , professor, Institute of Metallurgy and Materials Sciences, ShanghaiUniversity, Shanghai,200072)

Key words: Fe3Al surface reaction Auger electron spectrum hydrogen embrittlement

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