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通过原子探针 (AP)对体心立方 Fe- 17Cr合金的深度分析 ,在原子尺度上获得紧靠晶界 40 nm区域内Cr元素的分布。结果表明敏化 Fe- 17Cr合金在该区域存在贫 Cr区 ,证实了 Fe- Cr合金晶间腐蚀的贫 Cr理论。在距晶界约 30 nm内 ,出现比较平稳的 Cr分布平台 ,并且 Cr浓度低于相同 Cr含量的敏化 Fe- Cr- Ni合金 Cr浓度。
By atomic probe (AP) on the body-centered cubic Fe-17Cr depth analysis of the alloy, obtained in the atomic scale close to the grain boundary 40 nm Cr element distribution. The results show that the sensitized Fe-17Cr alloy has a Cr-depleted region in this region, demonstrating the lean Cr theory of intergranular corrosion of the Fe-Cr alloy. Within about 30 nm from the grain boundaries, a relatively stable Cr distribution plateau appears and the Cr concentration is lower than the Cr concentration of the sensitized Fe-Cr-Ni alloy with the same Cr content.