研究了纯Ｙ和两种Ｆｅ－Ｙ合金在６００～８００℃０．１ＭＰａ纯氧中的氧化．两种合金形成的外氧化膜包括Ｆｅ、Ｙ的氧化物及其复合氧化物，并发生了Ｙ的内氧化．内氧化区继承了原始合金的显微组织形貌，且内氧化区前沿无贫Ｙ现象．这些特点是Ｙ在基体金属中低的溶解度和合金中存在不同于基体金属α－Ｆｅ的金属间化合物相的直接结果．
The oxidation of two iron-based alloys containing 15wt % and 30wt % yttrium as well as pure yttrium has been studied in pure oxygen of 0. 1 MPa. Both alloys formed an external scale containing a mixture of iron and yttrium oxides and double Fe-Y oxides. A re- gion of internal oxidation of yttrium was formed in the alloys. The microstructure of the in- ternal oxidation region followed closely that of the original alloys and there was no any yttri- um depletion in the internal oxidation region. These results are examined by taking into ac- count the limited solubility of yttrium in iron and the presence of intermetallic compounds in the alloy.
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