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含铝金属间化合物普遍存在由水汽诱发而生的环境脆性,一般认为是由于空气中的水汽与铝化物中的Al在应力作用下发生表面反应,产生氢原子引起氢脆所致。但是上述表面反应只是根据金属间化合物在不同环境气氛中具有明显的塑性差异而提出的假设,至今并无直接的实验验证。本文应用俄歇能谱仪(AES)及X射线光电子谱仪(XPS)探讨Fe_3Al与水汽及氧气的表面反应动力学,首次用实验验证了金属间化合物与水汽发生表面反应。所得结果可用来解释Fe_3Al及其他金属间化合物在不同坏境气氛中具有不同力学性能的原因。
Aluminum-containing intermetallics are commonly found in water-vapor-induced environmental fragility. It is generally believed that the aluminum hydride in the air and the Al in the aluminide undergo a surface reaction under the action of stress and hydrogen atoms cause hydrogen embrittlement. However, the above-mentioned surface reactions are based on the assumption that intermetallic compounds have obvious plastic differences in different environmental atmospheres. So far, there is no direct experimental verification. In this paper, the surface reaction kinetics of Fe 3 Al with water vapor and oxygen was investigated by Auger spectroscopy (AES) and X-ray photoelectron spectroscopy (XPS). The surface reactions of intermetallic compounds with water vapor were verified by experiments for the first time. The results obtained can be used to explain the different mechanical properties of Fe 3 Al and other intermetallic compounds in different atmospheres.