The Influence of Niobium Additions on Creep Resistance of Fe-27 at. % Al Alloys

The Influence of Niobium Additions on Creep Resistance of Fe-27 at. % Al Alloys

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Results of creep tests of two Fe-27 at.% Al-based alloys with additions of 2.7 and 4.

8 at.% of niobium conducted in the temperature range from 650 °C to 900 °C in the authors’ laboratory are presented.The purpose of the study is to supplement previous work on Fe-Al-Nb w insta saree alloys to obtain a more complete overview of creep properties from the dilute alloy with 1% of Nb up to the eutectic alloy with 10% of niobium.

At higher temperatures and lower stresses, the creep resistance of the 10% niobium alloy is better than that of the lower niobium alloys.On the other hand, the eutectic alloy loses its preference at lower temperatures and trucan b higher deformation rates.This phenomenon is similar to that reported by Yildirim et al.

for Fe-50 at.% Al-based alloys and is probably associated with an increased stress sensitivity of the eutectic alloy.