SURFACE REACTION OF Ni_3Al WITH WATER VAPOR OR OXYGEN

Abstract

Abstract: The kinetics of the surface reactions of single crystal Ni3Al and polycrystal line Ni3Al0.00052 wt% B with water vapor or oxygen was investigated using XPS. Both reactions initiate at less than 1.5×10-6 Pa.s exposure. The reaction of Ni3Al does not saturote with water vapor at 0.43 Pa.s; with oxygen at 8.4×10-2 Pa.s and the oxide formed is Al2O3. The kinetics of these reactions can be used to eaplain the different ductility behavior of Ni3Al-based alloys in various environment.

Key words: Ni_3Al, surface reaction, XPS, hydrogen embrittlement

YX. Chen; X.J. Wan and W.X. Xu (Institute of Materials Sciences, Shanghai University, Shanghai 200072, China)(Shanghai Iron and Steel Research Institute, Shanghai 200940, China). SURFACE REACTION OF Ni_3Al WITH WATER VAPOR OR OXYGEN[J]. Acta Metallurgica Sinica (English Letters), 1997, 10(4): 363-368.

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SURFACE REACTION OF Ni_3Al WITH WATER VAPOR OR OXYGEN

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