Abstract
Al 2O 3 based composites containing 5–20 vol.% of Fe 3Al intermetallic second-phase particles were prepared by hot-pressing sintering. Significantly improved fracture toughness (8.1 MPa m 1/2) and bend strength (860 MPa) were achieved in Al 2O 3/20 vol.% Fe 3Al composite. The R-curve behavior for Al 2O 3/5–20 vol.% Fe 3Al composites was estimated by the indentation-strength method. The quantitative analysis of toughness increment indicates that the improvement was attributed to the crack bridging and residual thermal stress toughening effect. High-resolution transmission electron microscopy (HREM) shows that no micro-crack was observed at the interface due to the small thermal expansion coefficient mismatch, and no reaction phase existed at the interface between Al 2O 3 matrix and Fe 3Al particle.
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