High-temperature Oxidation Behavior of Laser Additively Manufactured AlCoCrFeNiSi High Entropy Alloy

doi:10.11902/1005.4537.2024.313

Journal of Chinese Society for Corrosion and protection

2025, Vol. 45

Issue (1): 217-223 DOI: 10.11902/1005.4537.2024.313

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High-temperature Oxidation Behavior of Laser Additively Manufactured AlCoCrFeNiSi High Entropy Alloy

GUO Jingbo¹, YANG Shouhua¹(

), ZHOU Ziyi¹, MU Rende², XIE Yun¹, SHU Xiaoyong¹, DAI Jianwei², PENG Xiao¹

1 School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang 330063, China
2 AECC Beijing Institute of Aeronautical Materials, Beijing 100095, China

Cite this article:

GUO Jingbo, YANG Shouhua, ZHOU Ziyi, MU Rende, XIE Yun, SHU Xiaoyong, DAI Jianwei, PENG Xiao. High-temperature Oxidation Behavior of Laser Additively Manufactured AlCoCrFeNiSi High Entropy Alloy. Journal of Chinese Society for Corrosion and protection, 2025, 45(1): 217-223.

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Abstract

High entropy alloy (HEA) of Al_0.21Co_0.17Cr_0.13Fe_0.11Ni_0.18Si_0.20 (atomic fraction) was fabricated by means of laser melting deposition (LMD) technique. The prepared alloy consists of a single body-centered-cubic (bcc) phase, and its grain size gradually refined as the laser power decreased from 900 W to 700 W. The bcc HEAs obtained at various laser powers were subjected to isothermal oxidation at 1100 ^oC in either dry air or wet air (air + 10%H₂O (volume fraction)), respectively. There were several observations: all HEAs had the ability to thermally develop a protective scale of Al₂O₃ in both dry and wet airs; the decrease in grain size favored the formation of Al₂O₃ scale with a slower growth rate; the presence of H₂O vapor accelerated the growth rate of Al₂O₃ scale. Finally, the above findings were discussed and interpreted.

Key words: laser additive manufacturing AlCoCrFeNiSi high entropy alloy high-temperature oxidation

Received: 25 September 2024 32134.14.1005.4537.2024.313

ZTFLH:

TG174

Fund: National Natural Science Foundation of China(52371067)

Corresponding Authors: YANG Shouhua, E-mail: by2201158@buaa.edu.cn

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	GUO Jingbo
	YANG Shouhua
	ZHOU Ziyi
	MU Rende
	XIE Yun
	SHU Xiaoyong
	DAI Jianwei
	PENG Xiao

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https://www.jcscp.org/EN/10.11902/1005.4537.2024.313 OR https://www.jcscp.org/EN/Y2025/V45/I1/217

Table 1 LMD process parameters for manufacturing Al_0.21Co_0.17Cr_0.13Fe_0.11Ni_0.18Si_0.20 HEA

Table 2 Chemical compositions of Al_0.21Co_0.17Cr_0.13Fe_0.11-Ni_0.18Si_0.20 fabricated by LMD at different laser powers

Fig.1 XRD patterns of Al_0.21Co_0.17Cr_0.13Fe_0.11Ni_0.18Si_0.20 fa-bricated by LMD at different laser powers

Fig.2 Morphologies (a, b) and grain size distributions (c, d) of Al_0.21Co_0.17Cr_0.13Fe_0.11Ni_0.18Si_0.20 manufactured by LMD at 700 W (a, c) and 900 W (b, d). The inset in Fig.2a is a magnified image

Fig.3 Oxidation kinetics (a) and corresponding parabolic plots (b) of Al_0.21Co_0.17Cr_0.13Fe_0.11Ni_0.18Si_0.20 fabricated by LMD at different laser powers during 20 h exposure to dry air at 1100 ^oC

Fig.4 Cross-sectional morphologies of Al_0.21Co_0.17Cr_0.13Fe_0.11Ni_0.18Si_0.20 fabricated by LMD at 700 W (a), 800 W (b) and 900 W (c) after 20 h exposure to dry air at 1100 ^oC

Fig.5 Oxidation kinetics (a) and corresponding parabolic plots (b) of Al_0.21Co_0.17Cr_0.13Fe_0.11Ni_0.18Si_0.20 fabricated by LMD at different laser powers during 20 h exposure to wet air at 1100 ^oC

Fig.6 Cross-sectional morphologies of Al_0.21Co_0.17Cr_0.13Fe_0.11Ni_0.18Si_0.20 fabricated by LMD at 700 W (a), 800 W (b) and 900 W (c) after 20 h exposure to wet air at 1100 ^oC

Fig.7 Ellingham-Richardson diagram for corresponding oxides of constituent elements of AlCoCrFeNiSi

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