Abstract
Fabrication, microstructure and properties of in situ formation of strengthened eutectic composites, consisting of a matrix (B4C, and B4C–NbB2 composite) and also containing regularly distributed whiskers of NbB2 by spark plasma sintering (SPS) is reported. It has shown that pressure and the temperature at which pressure is decreased during SPS may be used as a means of controlling the eutectic formation and composites microstructure. The microstructure-property relations were determined for composites of NbB2–B4C eutectic composition as a function of NbB2 content, eutectic inclusion rod size and NbB2–NbB2 spacing distance. It was found that the composites with the eutectic composition of 30–35 mol.% NbB2 obtained by SPS exhibit a high Vickers hardness (26–27 GPa) and a maximum in indentation fracture toughness (~7 MPa·m1/2) in case of interlamelar spacing distance of 0.8 ± 0.4 µm.
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