论文部分内容阅读
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FeAl_2O_4,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,Fe_(17)Y_2被氧化成Y_2O_3和Fe.两种合金的高温氧化膜结构中都未形成连续的Al_2O_3或Y_2O_3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 oxidation behavior of as-cast Fe-5Y-1Al alloy and Fe-5Y-2Al alloy in air at 800 ℃ was studied.The results show that the kinetics of the two ternary alloys almost obeys the parabolic law and the parabola of Fe-5Y-1Al The rate constant is 2 orders of magnitude lower than that of Fe-5Y-2Al.The oxide film of Fe-5Y-1Al alloy is a composite oxide FeAl 2 O 4 with spinel structure, which suppresses the inward diffusion of O and the outward diffusion of Fe , So that the oxidation rate of the alloy gradually decreased and showed good corrosion resistance.The internal oxidation of the Fe-5Y-2Al alloy matrix and the oxidation of Fe 17 Y 2 to Y 2 O 3 and Fe were carried out. No continuous Al_2O_3 or Y_2O_3 films were formed in the structure due to the small content of Al and Y, on the one hand, and the complexity of the duplex structure, on the other hand, resulting in limited mutual solubility and extremely low The proliferation of capacity.