Abstract
Abstract (Zr, Hf)B 2 –SiC nanostructured composites were fabricated by high energy ball milling and reactive spark plasma sintering (RSPS) of HfB 2 , ZrSi 2 , B 4 C and C. Highly dense composites with homogeneously intermixed ultra-fine (Zr, Hf)B 2 and SiC grains (100–300 nm) were obtained after RSPS at 1600 °C for 10 min. The densification was promoted by high energy ball milling and ZrSi 2 additive. The additives were almost completely transformed into ZrB 2 and SiC during densification. The improvement of flexural strength and fracture toughness (641 MPa and 5.36 MPa m 1/2 , respectively) was achieved. The relationships between the ultra-fine microstructure and mechanical properties were discussed.
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