Abstract
Composites of NiAl reinforced with silicon carbide and tetragonal zirconia particles were fabricated by hot-pressing, and the effects of SiC and ZrO 2 content on the room temperature mechanical properties were investigated. Results showed that SiC is not an efficient ceramic for the enhancement of mechanical properties of NiAl. By contrast, improvements in flexural strength and fracture toughness, to 735 MPa and 11.3 MPa√m, respectively, can be reached by incorporating 15 vol% of zirconia. These increases in performance may result from the low thermal expansion mismatch between the ceramic reinforcement and the intermetallic, and from the stress-induced transformation of the metastable ZrO 2 particles.
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