Initial Oxidation Behavior of AlCoCrFeNi High-Entropy Coating Produced by Atmospheric Plasma Spraying in the Range of 650 °C to 1000 °C

Rong Chen; Xin You; Ke Ren; Yuwei Liang; Taihong Huang; Biju Zheng; Peng Song

doi:10.3390/ma17030550

Initial Oxidation Behavior of AlCoCrFeNi High-Entropy Coating Produced by Atmospheric Plasma Spraying in the Range of 650 °C to 1000 °C

Materials (Basel). 2024 Jan 23;17(3):550. doi: 10.3390/ma17030550.

Authors

Rong Chen¹, Xin You¹, Ke Ren¹, Yuwei Liang¹, Taihong Huang^{1

2}, Biju Zheng¹, Peng Song^{1

3}

Affiliations

¹ Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China.
² Yunnan Engineering Research Center of Metallic Powder Materials, Kunming 650093, China.
³ Faculty of Civil Aviation and Aeronautics, Kunming University of Science and Technology, Kunming 650500, China.

Abstract

As protective coatings for the thermal parts of aero-engines, AlCoCrFeNi coatings have good application prospects. In this study, atmospheric plasma spraying (APS) was used to prepare AlCoCrFeNi high-entropy coatings (HECs), which were oxidized from 650 °C to 1000 °C. The mechanism of the oxide layer formation and the internal phase transition were systematically investigated. The results show that a mixed oxide scale with a laminated structure was formed at the initial stage of oxidation. The redistribution of elements and phase transition occurred in the HECs' matrix; the BCC/B2 structure transformed to Al-Ni ordered B2 phase and Fe-Cr disordered A2 phase.

Keywords: high-entropy coatings; oxidation behavior; phase transition; plasma spraying.

Grants and funding

This research was funded by the Yunnan Province Science, Technology Major Project [Grant No. 202202AB080011], the Basic Research Special Youth Project [Grant No. 202201AU070087] the National Natural Science Foundation of Yunnan [Grant No. 202201AT070111].