Collection of scientific works Nanosystems, nanomaterials, nanotechnologies Year 2024 Volume 22, Issue 2
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D.O. REZNIK, D.L. PALAGECHA, K.V. KRYVENKO, S.G. PONOMARCHUK, Ya.V. ZAULICHNYI, O.V. STEPANOV, D.S. LEONOV, and Yu.I. BOGOMOL

Ceramic Composite on the Basis of Boron Carbide Directed Reinforced on Mesolevels with High-Entropy Diboride of Transition Metals
249–260 (2024)

PACS numbers: 61.72.Ff, 62.20.mt, 62.20.Qp, 62.23.Pq, 68.37.Hk, 81.05.Je, 81.05.Ni

Directionally solidified B4C/(V0.2Ta0.2Cr0.2Mo0.2W0.2)B2-alloy eutectic ceramics are prepared by the floating zone method based on the crucibleless zone melting of compacted powders using B4C and transition metal diboride (VB2, TaB2, CrB2, MoB2, WB2) powders as initial materials. The microstructure of as-prepared composites consists of a B4C matrix uniformly reinforced on mesolevel by means of the single-phase high-entropy (V0.2Ta0.2Cr0.2Mo0.2W0.2)B2 diboride. The XRD analysis of the composites confirms the presence of the following phases in their compositions: B4C and (V0.2Ta0.2Cr0.2Mo0.2W0.2)B2. The effect of the solidification rate on the structural and micromechanical characteristics of the B4C/(V0.2Ta0.2Cr0.2Mo0.2W0.2)B2 ceramics is revealed. As found, an increase in the solidification rate leads to a decrease in the size of the reinforcing phase and an increase in hardness and fracture toughness from 25.26 to 32.48 GPa and from 3.64 to 5.84 MPa•m1/2, respectively

KEY WORDS: boron carbide, high-entropy borides, directionally solidified eutectic composites, Vickers hardness, fracture toughness

DOI:  https://doi.org/10.15407/nnn.22.02.249

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