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Fe-23Cr-6Al合金在300～1300℃空气中氧化时,表面形成的位错蚀坑因位错运动而发展成蚀槽,其上的氧化膜就形成皱褶。稀土阻止位错蚀坑的形成和发展,因而含稀土的Fe-23Cr-6Al合金的氧化膜不形成皱褶。同时,稀土也抑制合金表面上晶界、夹杂和碳化物周围基体的热蚀,避免氧化膜—基体之间空洞的形成,稀土与合金中晶体缺陷的交互作用是产生上述作用的可能原因。
When the Fe-23Cr-6Al alloy is oxidized in the air at 300 ~ 1300 ℃, the dislocation pits formed on the surface become eroded due to the dislocation movement, and the oxide film on the surface forms wrinkles. Rare earths prevent the formation and development of dislocation pits, so the oxide film of the Fe-23Cr-6Al alloy containing rare earth does not form wrinkles. At the same time, rare earth also inhibits the grain boundary, inclusions and the thermal corrosion of the matrix around the carbide on the alloy surface, and avoids the formation of voids between the oxide film and the matrix. The interaction between the rare earth and the crystal defects in the alloy is the possible reason.