High-temperature tribological properties of Fe50Mn25Cr5Al15Ti5 iron-based high-entropy alloys

Abstract

The iron-based high-entropy alloys are poised to become the next generation of high-temperature materials due to their outstanding mechanical properties and cost-effectiveness. In this work, the microstructure, mechanical properties, and tribological behaviors of Fe₅₀Mn₂₅Cr₅Al₁₅Ti₅ iron-based high-entropy alloys are investigated. The grain morphology of Fe₅₀Mn₂₅Cr₅Al₁₅Ti₅ alloy is equiaxed and dominated by BCC structure. Fe₅₀Mn₂₅Cr₅Al₁₅Ti₅ alloy has higher hardness, better resistance to high-temperature softening and superior wear resistance than Hadfield steel (40Mn18Cr3). Within 800 °C, wear rate remains a low order of 10⁻⁵ mm³/N·m. At RT, abrasive wear is the dominant mechanism. At 400 °C, non-dense oxide layer containing unoxidized metal is formed, resulting in delamination, adhesion and abrasion. At 800 °C, a dense wear-resistant oxide glaze layer covers the wear surface.