Work

Influence of hydrogen charging on microstructure and mechanical properties in a single FCC Al0.35CoCrFeNi high-entropy alloy

Year: 2025

Type: article

Abstract: The effect of hydrogen on the room-temperature mechanical behaviour of the Al0.35CoCrFeNi high-entropy alloy has been investigated. The studied alloy was prepared by vacuum induction melting and gravity casting, followed by three-step hot forging at a temperature of 1250 °С. Heat treatment at 1330 °C for 10 min resulted in a homogenized equiaxed grain structure with a face-centered cubic crystal structure. The samples were electrochemically charged at a constant current density. Hydrogen charging increased the yield strength of the studied alloy while reducing the ultimate tensile strength and ductility. Fractography analyses after tensile testing revealed that hydrogen induces localized embrittlement, particularly at the sample surface, where high hydrogen concentrations promote crack initiation along grain boundaries. The work hardening rate of hydrogen-charged and uncharged samples exhibits similar overall trends, indicating that hydrogen does not lead to an additional hardening effect. The studied Al0.35CoCrFeNi alloy exhibits relatively good immunity to hydrogen embrittlement, and hydrogen concentration does not lead to severe degradation of mechanical properties.

Source: Journal of Alloys and Compounds

DOI: 10.1016/j.jallcom.2025.182366

Authors: Kateryna Kamyshnykova, Tatiana Pelachová, Michaela Štamborská, Alena Klimová

Institutions: Slovak Academy of Sciences, Institute of Materials and Machine Mechanics of the Slovak Academy of Sciences

Language: English

Topic: High Entropy Alloys Studies

Subfield: Mechanical Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $3,660

Funders: Agentúra na Podporu Výskumu a Vývoja, Vedecká Grantová Agentúra MŠVVaŠ SR a SAV