Abstract
Crack propagation behavior of a chemical vapor deposited (CVD) Si3N4–TiN composite was investigated by micro-indentation fracture (MIF) and high-resolution electron microscopy (HREM) techniques. TiN fibers are homogeneously dispersed in large Si3N4 grains (about 8 μm in diameter), leading to an intragranular nano-composite structure, and their interfaces were directly bonded without any other phases. The main fracture mode is a mixed type of intergranular and transgranular fracture. Nanometer-sized TiN dispersed in the matrix grains interacts with cracks, generating crack bridging and microcracking which toughens the composite.
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