Abstract
Abstract Al2O3–TiAl and Al2O3-containing refractory Ni- and Fealloy composites have been fabricated by reactive in situ infiltration of TiO2 and metal oxide/metal compacts loaded with large-sized (> 5 lm) Al particles. When the compacts were heated to ignition temperature (∼ 900 °C) under pressure, thermal explosion with temperatures > 2000 °C took place leading to fully dense composites. These were characterized by X-ray diffraction, scanning and transmission electron microscopy, and atomic force microscopy. Fracture strengths and toughnesses of 47 vol.% Al2O3–TiAl were 650 MPa and 6.4 MPapm, of 26 vol.% Al2O3-containing Fe-based alloys were 1100 MPa and 18 MPapm, and those of 12 vol.% Al2O3-containing Ni-base alloys were 1450 MPa and 23 MPapm, respectively.
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