The oxidation behavior of the CrFeCoNiAlx (x = 0, 1.0, and 5.0 wt%) high-entropy alloy synthesized with Al elemental powder via powder bed fusion technique at high temperatures

Yulia O Kuzminova; Denis G Firsov; Anastasia A Shibalova; Stanislav A Evlashin; Igor V Shishkovsky; Stanislav S Dautov

doi:10.1016/j.micron.2022.103399

The oxidation behavior of the CrFeCoNiAl_x (x = 0, 1.0, and 5.0 wt%) high-entropy alloy synthesized with Al elemental powder via powder bed fusion technique at high temperatures

Micron. 2023 Mar:166:103399. doi: 10.1016/j.micron.2022.103399. Epub 2022 Dec 29.

Authors

Yulia O Kuzminova¹, Denis G Firsov¹, Anastasia A Shibalova², Stanislav A Evlashin³, Igor V Shishkovsky¹, Stanislav S Dautov⁴

Affiliations

¹ Center for Materials Technologies, Skolkovo Institute of Science and Technology, Moscow 121205, Russia.
² Institute of Nanotechnology of Microelectronics of Russian Academy of Science, Moscow 119991, Russia.
³ Center for Materials Technologies, Skolkovo Institute of Science and Technology, Moscow 121205, Russia; World-Class Research Center, State Marine Technical University, Saint Petersburg 190121, Russia.
⁴ Center for Materials Technologies, Skolkovo Institute of Science and Technology, Moscow 121205, Russia. Electronic address: s.dautov@skoltech.ru.

PMID: 36634433
DOI: 10.1016/j.micron.2022.103399

Abstract

High-entropy alloys (HEAs) are promoted as promising materials for various applications, including those dealing with high-temperatures. It requires understanding of the oxidation at different temperatures, especially for such a technological process as additive manufacturing (AM), which is able to produce unique structure. The present work evaluates the oxidation resistance of the CrFeCoNiAl HEAs produced by AM of the blends of CrFeCoNi and Al powders at temperatures of 800 and 1000 ℃. Al forms the Al₂O₃ under the top Cr₂O₃ layer and prevents the delamination of the oxide scale at considered temperatures. Oxygen diffusion mainly occurs homogeneously through the columnar grain boundaries typical for AM materials. AlN precipitates under the Al₂O₃ formations were observed for the sample with the highest aluminium concentration due to dissolution of nitrogen in the as-built material.

Keywords: Additive manufacturing; Heat treatment; High-entropy alloy; Microstructure; Oxidation.