本實驗探討兩系列不同α/γ相比例之雙相型鐵錳鋁合金，在空氣中800℃的高溫氧化行為及氧化程度。系列Ⅰ合金A、B、C、D及E，藉由碳含量的改變，控制α/γ相比例，觀察不同晶相在800℃的氧化性質，研究其氧化機構。系列Ⅱ合金A′、C′及D′，則藉維持46%到60%之α相，並分別添加3與6%的鉻，了解鉻的抗高溫氧化效果。實驗結果顯示：系列Ⅰ合金，γ相比例愈高，試片氧化重量增加愈快。且氧化層主要發生在γ相。利用電子微探儀，分析氧化層元素的分布，探究氧化的機構，由此機構及兩相的成分不同解釋氧化現象的不同。系列Ⅱ合金的實驗證明，鉻的含量增加，改變氧化層形成的方式，抗高溫氧化的能力亦增加。

The oxidation behaviors of two series of two-phase Fe-Mn-Al alloys with various ratios of ferrite/austenite in air at 800℃ were investigated. The rates of oxidation were measured by a thermogravimetric analyzer. The oxidation resistance of these alloys increased as the ferrite content increased. Addition of chromium also increased the oxidation resistance. The morphologies of the surface oxide layer were examined. The thickness of the scale in the austenitic phase was much higher than that in the ferritic phase. An in-situ observation of the oxidation reaction of alloy C under an optical microscope equipped with a hot stage was also performed. It was found that the oxidation occurred preferentially in the austenitic phase, and oxidation in the ferritic phase was much less severe. The distribution of the elements in the oxide layer was analyzed using an electron probe microanalyzer. The oxidation mechanism was modeled, the different oxidation resistance of the austenitic and ferritic phases was explained based on the oxidation model and the different compositions in these two phases.