研究了铸态Fe-5Y-1Al合金和Fe-5Y-2Al合金在800℃空气中的高温氧化行为.结果表明, 两种三元合金动力学都近似遵守抛物线规律,Fe-5Y-1Al的抛物线速率常数比Fe-5Y-2Al的低2个数量级.Fe-5Y-1Al合金的氧化膜为尖晶石结构的复合氧化物FeAl2O4,很好的抑制了O的向内扩散和Fe的向外扩散,从而使合金的氧化速率逐渐下降并表现出很好的耐腐蚀性能.Fe-5Y-2Al合金基体发生了内氧化,Fe17Y2被氧化成Y2O3和Fe.两种合金的高温氧化膜结构中都未形成连续的Al2O3或Y2O3膜,一方面是由于Al和Y的含量较少,另一方面则主要是因为双相合金结构的复杂性导致了组元间有限的互溶度和极低的扩散能力.
The air oxidation of cast alloys Fe-5Y-1Al and Fe-5Y-2Al has been studied at 800℃. The results indicated that the oxidation kinetic curves for the two alloys followed approximately parabolic rate law. Fe-5Y-1Al alloy was able to form an oxide scale of spinel FeAl2O4, which prevented alloy from being oxidized further, while Fe-5Y-2Al alloy suffered from internal oxidation of yttrium. A continuous oxide scale of Al2O3 or Y2O3 was not found on the surface of alloy or in the alloys because the yttrium or aluminum content was insufficient, whilst the diffusivity of them was limited in the two phase alloys.
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