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The influence of Y addition on the microstructural features, phase relationships, hardness, magnetic behaviour and cyclic oxidation performance of Fe 60 Al 40−nYnalloys ( n  = 1, 3, and 5 at.%) has been examined in detail. Al 8 Fe 4 Y phase formed even at 1 at.% Y addition because of the limited solid solubility of Y in the FeAl-based phase. For all the examined compositions, the Al 8 Fe 4 Y phase developed a eutectic with the FeAl-based phase and its volume fraction increased with increasing Y up to 5 at.%, which is near the eutectic composition. The mean microhardness values increased with increasing Y content for both as-cast and heat-treated samples. Cyclic oxidation tests revealed that the oxidation rate and scale thickness increased with increasing Y content. α-Al 2 O 3  was the main surface oxide for all compositions. θ-Al 2 O 3  was also formed with relatively low amount. An internal oxidation layer composed of mixed Al/Y oxides was observed beneath the surface layer.

Effect of Y Addition on the Structural Properties and Oxidation Behavior of Fe 60 Al 40-n Y n Alloys (n= 1, 3, and 5 at.%)