研究了NiAl、NiAl-20Fe、NiAl-30Fe金属间化合物在1000℃～1100℃空气中的氧化行为。NiAl和NiAl-20Fe显示较好的抗氧化性能。NiAl-30Fe的抗氧化性能却很差。从合金相组成探讨了NiAl-Fe合金的氧化机制。
The oxidation of NiAl,NiAl-20Fe and NiAl-30Fe at 1000～1100℃ in air has been studied.Fe addition changes single βphase sturcture of NiAl into two phase structure (β and γ).Pure NiAl shows excellent oxidation resistance due to the formation of an Al2O3 scale.NiAl-20Fe also shows good oxidation resistance due to the formation of an Al2O3 scale on β phase substrate.Besides,some nodules consistion of mixed oxides of Fe and Ni grow over ductile γ phase substrate.Besides,some nodules consisting of mixed oxides of Fe and Ni grow over ductile γ phase incorporated in the β phase substrate.NiAl-30Fe alloy suffers form catastrophic oxidation due to the formation of a non-protective Fe and Ni-rich scale,Which is extremely susceptive to spallation.Therefore,the two phase sructure of NiAl-Fe is detrimental to its oxidation resistance.
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