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HIGH TEMPERATURE OXIDATION OF TWO-PHASE NiAl-Fe INTERMETALLIC COMPOUNDS |
Chaoliu Zeng;;; |
中科院金属腐蚀与防护研究所 |
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Abstract 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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Received: 18 July 2005
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Corresponding Authors:
Chaoliu Zeng
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