Detonation spraying of boron-doped off-stoichiometric (Fe20Co23.9Ni20Cr15)(Al20Ti1.1) chemically complex intermetallic alloys

Colloids and Surfaces A: Physicochemical and Engineering Aspects. 2025. Vol. 710. Article 136291.

Ostovari Moghaddam A., Mikhailov D., Shaburova N., Polyakova M., Pashkeev K., Solizoda I. A., Iarushina D., Samodurova M.

In this work, (Fe20Co23.9Ni20Cr15)(Al20Ti1.1) and [(Fe20Co23.9Ni20Cr15)(Al20Ti1.1)]98.5B1.5 chemically complex intermetallic alloys (CCIMAs) were first prepared by vacuum melting followed by ball milling, and then employed as precursor powders for depositing coatings on a low alloy steel substrate using detonation spraying. The precursor CCIMAs exhibited a dense lamellar dual-phase microstructure consisting of multicomponent L12 and Cr-rich BCC phases. Both CCIMAs highly retained their L12+BCC dual-phase microstructure during detonation spraying in spite of some degree of oxidation. The boron-doped CCIMA coating exhibited higher microhardness compared with the un-doped coating (947 HV vs. 834 HV), which was attributed to the interstitial hardening effect of boron. It was further revealed that boron-doping increases wear resistance of CCIMA, where the boron-doped [(Fe20Co23.9Ni20Cr15)(Al20Ti1.1)]98.5B1.5 exhibited lower wear rate and friction coefficient than un-doped CCIMA at room temperature (RT), 400 ºC and 600 ºC. The wear rates of boron-doped and un-doped CCIMAs were 1.3 × 10−5 mm3/N.m vs. 2.5 × 10−5 mm3/N.m at RT, 3.9 × 10−5 mm3/N.m vs. 5.0 × 10−5 mm3/N.m at 400 ºC, and 4.5 × 10−5 mm3/N.m vs. 5.8 × 10−5 mm3/N.m at 600 ºC. The abrasive wear was dominant wear mechanism at RT, while oxidative wear was dominated at high temperatures. Finally, CCIMAs are introduced as proper candidates for fabricating intermediate- and high-temperature wear resistance coatings.

Keywords: износ, микротвердость, microhardness, detonation spraying, детонационное напыление, Chemically complex intermetallic alloys, Lamellar microstructure, Wear, Химически сложные интерметаллические сплавы, Пластинчатая микроструктура

Publication based on the results of: Advanced materials and technologies (2025)