Work

Effect of silicon microalloying on microstructure and HVOF spraying behavior of AlCrFeCoNi high-entropy alloy coating

Year: 2026

Type: article

Abstract: This study investigates the effect of 0.11 wt. % Si microalloying on AlCrFeCoNi high-entropy alloy coatings produced via mechanical alloying and HVOF spraying. Optimal milling times were 7.5 h for the base alloy and 10 h for the Si-modified one. Spark plasma sintering revealed mixed Body-Centered Cubic and Face- Centered Cubic structures with silicide precipitates. Preliminary abrasive wear tests indicated a tendency for surface stabilization in the Si-modified alloy due to tribo-oxide films. Crucially, during HVOF, Si preferentially oxidized, shielding Cr from burnout (17.64 vs. 14.16 % in the base coating) and significantly improving coating adhesion by eliminating through-cracking, forming a monolithic structure.

Source: Materials Physics and Mechanics

DOI: 10.18149/mpm.5442026_4

Authors: Volokitina, E.V., Masaylo, D.V., Kim, A.E., Popovich, A.A.

Language: English

Topic: High Entropy Alloys Studies

Subfield: Mechanical Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: green

OpenAlex ID: W7225146540

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