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Metals and Materials International

, Volume 7, Issue 5, pp 471–477 | Cite as

Effects of change in growth mechanism due to Yttrium-addition in adhesion of alumina scale formed on Fe3Al alloy: Countercurrent diffusion modification model

  • Insoo Kim
Article

Abstract

The effects of Y-addition on the high-temperature oxidation of Fe3Al alloy were investigated in air at a temperature range of 800–1100°C. The reactive element enhanced the initial nucleation of the oxide scale and thus formed a fine-grained oxide. The grain refinement of the alumina scale due to the addition of yttrium changed the growth mechanism of the oxide from a countercurrent diffusion of Al and O to a predominantly inward oxygen diffusion, which led to the formation of pegs on the scale/alloy interface, the prevention of the formation of voids in the substrate, and a decrease in growth stress. The beneficial effects of the reactive element on oxide adhesion are explained by “countercurrent diffusion modification model” suggested in this study.

Keywords

oxidation reactive elements Fe3Al adhesion 

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Copyright information

© Springer 2001

Authors and Affiliations

  • Insoo Kim
    • 1
  1. 1.Department of Metallurgical EngineeringDong-A UniversityBusanKorea

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