Effect of Y Addition on the Structural Properties and Oxidation Behavior of Fe60Al40-nYn Alloys (n=1, 3, and 5 at.%)

2022-04-01
Yildirim, Mehmet
Atas, Mehmet Sahin
Akdeniz, Mahmut Vedat
Mehrabov, Amdulla
The influence of Y addition on the microstructural features, phase relationships, hardness, magnetic behaviour and cyclic oxidation performance of Fe60Al40-nYn alloys (n = 1, 3, and 5 at.%) has been examined in detail. Al8Fe4Y 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 Al8Fe4Y 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. alpha-Al2O3 was the main surface oxide for all compositions. theta-Al2O3 was also formed with relatively low amount. An internal oxidation layer composed of mixed Al/Y oxides was observed beneath the surface layer.
MATERIALS AT HIGH TEMPERATURES

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Citation Formats
M. Yildirim, M. S. Atas, M. V. Akdeniz, and A. Mehrabov, “Effect of Y Addition on the Structural Properties and Oxidation Behavior of Fe60Al40-nYn Alloys (n=1, 3, and 5 at.%),” MATERIALS AT HIGH TEMPERATURES, pp. 0–0, 2022, Accessed: 00, 2022. [Online]. Available: https://hdl.handle.net/11511/97192.