The in situ synthesis/consolidation of B 4 C-TaB 2 eutectic composites by spark plasma sintering (SPS) is reported. The microstructure-property relations were determined for composites with the B4C-TaB2 eutectic composition as functions of TaB2 content, and TaB 2 -TaB 2 interlamellar spacing. A clear maximum in fracture toughness was identified (~4.5 MPa m 1/2 ) for eutectic composites with interlamellar spacing between 0.9 and 1.1 μm. The composites with the hypereutectic composition of 40 mol.% TaB2 obtained by SPS exhibited lower Vickers hardness (25-26 GPa) but higher indentation fracture toughness (up to 4.9 MPa m 1/2 ) than eutectic composites with 30-35 mol.% of TaB 2 .
ASJC Scopus subject areas
- Ceramics and Composites