Abstract
Starting with a mixture of ultrafine β‐Si3N4 and a SiO2‐containing additive, a superplastic Si3N4‐based composite was developed, using the concept of a transient liquid phase. Significant deformation‐induced phase and microstructure evolutions occurred in the nonequilibrium, fine‐grained Si3N4 material, which led to the in situ development of a Si3N4–22‐vol%‐Si2N2O composite and strong texture formation. The unusual ductility of the composites with elongated Si2N2O grains was attributed to the fine‐grained microstructure, the presence of a transient liquid phase, and the alignment of the elongated Si2N2O grains. The mechanical properties of the resultant composite were enhanced rather than impaired by superplastic deformation and subsequent heat treatment; the resultant composite exhibited both high strength (957 MPa) and high fracture toughness (4.8 MPa·m1/2).
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