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The research leading to these results has received funding from the commissioned task entitled “VIA CARPATIA Universities of Technology Network” under the Special Purpose Grant from the Minister of Science and Higher Education, Contracts No. MNiSW/2026/DAP/432, MNiSW/2026/DAP/434 and MNiSW/2026/DAP/435, action entitled “ISKRA—building inter-university research teams”.
the effect of nominal tiB2 additions (0 to 30 vol pct) on the microstructure, hardness, sliding wear,
and solid-particle erosion resistance of arc-melted al0.7cocrFeniti0.2 high-entropy alloy was investi-
gated. X-ray diffraction showed a predominantly Fcc matrix with a minor Bcc/B2 contribution, while
distinct tiB2 reflections were observed only for the 30 vol pct material. seM–eds revealed increas-
ingly pronounced ti- and B-rich segregation with increasing tiB2 addition and coarse plate-like tiB2
particles at 30 vol pct. Hardness increased from 457 HV5 for the reference alloy to a maximum of 663
HV5 at 15 vol pct tiB2, then decreased to 574 HV5 at 30 vol pct. sliding wear resistance improved
markedly up to 15 vol pct tiB2, for which the specific wear rate decreased by approximately 82 pct and
the coefficient of friction reached its minimum. in contrast, the best solid-particle erosion resistance at
90 deg impingement was obtained at 5 vol pct tiB2, with approximately 38 pct lower volume loss than
the reference alloy. Higher nominal tiB2 additions increased erosion loss despite higher hardness. the
results demonstrate that the nominal tiB2 addition providing the best performance among the investi-
gated compositions depends on the degradation mechanism and is governed by the combined effects
of matrix strengthening, reinforcement morphology, microstructural heterogeneity, and impact- or
sliding-induced damage.
