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The microstructure and mechanical properties of hot-pressed alumina (Al 2 O 3 ) matrix composites containing 20, 35, or 50 vol% of nickel aluminide (NiAl) were investigated. The mean Al 2 O 3  grain size was found to decrease from approximately 2.0 μm (monolithic Al 2 O 3 ) to 1.0 μm for the composite containing 50 vol% NiAl. Composite flexural strength values were lower than both the monolithic Al 2 O 3  and NiAl and attributed to the weakly bonded NiAl particles acting as flaw origins. In contrast to this, the fracture toughness increased with NiAl volume fraction to a maximum of 4.90 MPa·m 1/2 , thus confirming the toughening effect of NiAl addition on Al 2 O 3  ceramics, with the slope of the rising R-curve for the composite being approximately 8 times that of monolithic Al 2 O 3 .

Mechanical Behaviour of Nickel Aluminide Reinforced Alumina (AL2O3-NiAl) Composites

Mechanical Behaviour of Nickel Aluminide Reinforced Alumina (AL₂O₃-NiAl) Composites