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

Yildirim M., Atas M. S., Akdeniz M. V., Mekhrabov A.

MATERIALS AT HIGH TEMPERATURES, vol.39, no.3, pp.220-230, 2022 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 39 Issue: 3
  • Publication Date: 2022
  • Doi Number: 10.1080/09603409.2022.2056298
  • Journal Name: MATERIALS AT HIGH TEMPERATURES
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED)
  • Page Numbers: pp.220-230
  • Keywords: Intermetallics, Iron aluminides (based on FeAl), Microstructure, Oxidation, HIGH-TEMPERATURE OXIDATION, IRON-ALUMINUM-ALLOYS, MECHANICAL-PROPERTIES, REACTIVE-ELEMENT, INTERMETALLIC ALLOYS, FEAL INTERMETALLICS, MAGNETIC-BEHAVIOR, CYCLIC OXIDATION, LAVES PHASE, PART II
  • Middle East Technical University Affiliated: Yes

Abstract

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.