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The cyclic oxidation behaviors of Fe-28Al-5Cr-O. 1Zr (at%) and Fe-28Al5Cr-O.5Nb (at%) alloys have been investigated in air at high temperature. The results show that the distinctive whisker-like oxides were formed on the surface of Zr-containing Fe3 Al based alloy after 500 hrs. cyclic oxidation at 800℃ and 1000℃. The results also indicate that the addition of small amount of Zr to Fe3 Al based alloy can improve its adherence strength between the oxides and metal substrate and is beneficial to the oxidation resistance. However, for the Nb-containing Fe3 Al based alloy, porous convoluted oxides were formed after 350 hrs. cyclic oxidation at 1000℃, and this type of oxides didn’t not contribute to the oxidation resistance.
The cyclic oxidation behaviors of Fe-28Al-5Cr-O.1Zr (at%) and Fe-28Al5Cr-O.5Nb (at%) alloys have been investigated in air at high temperature. The results show that the distinctive whisker-like oxides were formed on the surface of Zr-containing Fe3Al based alloy after 500 hrs. cyclic oxidation at 800 ° C and 1000 ° C. The results also indicate that the addition of small amount of Zr to Fe3Al based alloys can improve its adherence strength between the However, for the Nb-containing Fe3Al based alloy, porous convoluted oxides were formed after 350 hrs. cyclic oxidation at 1000 ° C, and this type of oxides did not not contribute to the oxidation resistance.