Isothermal oxidation of aluminized coatings on high-entropy alloys

Che Wei Tsai, Kuen Cheng Sung, Kzauki Kasai, Hideyuki Murakami

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The isothermal oxidation resistance of Al0.2Co1.5CrFeNi1.5Ti0.3 high-entropy alloy is analyzed and the microstructural evolution of the oxide layer is studied. The limited aluminum, about 3.6 at %, leads to the non-continuous alumina. The present alloy is insufficient for severe circumstances only due to chromium oxide that is 10 μm after 1173 K for 360 h. Thus, the aluminized high-entropy alloys (HEAs) are further prepared by the industrial packing cementation process at 1273 K and 1323 K. The aluminizing coating is 50 μm at 1273 K after 5 h. The coating growth is controlled by the diffusion of aluminum. The interdiffusion zone reveals two regions that are the Ti-, Co-, Ni-rich area and the Fe-, Cr-rich area. The oxidation resistance of aluminizing HEA improves outstandingly, and sustains at 1173 K and 1273 K for 441 h without any spallation. The alumina at the surface and the stable interface contribute to the performance of this Al0.2Co1.5CrFeNi1.5Ti0.3 alloy.

Original languageEnglish
Article number376
JournalEntropy
Volume18
Issue number10
DOIs
Publication statusPublished - 2016 Jan 1
Externally publishedYes

Keywords

  • Aluminizing
  • High entropy alloys
  • Isothermal oxidation

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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