Abstract
Ni-SiOC nanocomposites are synthesized through co-sputtering Ni and Si-O-C and then annealed at high temperature up to 800 °C to obtain two characteristic microstructures, core (crystalline Ni)-shell (amorphous ceramic SiOC) nanostructures and submicron-grained Ni containing amorphous ceramic SiOC particles. In-situ scanning electron microscope (SEM) compression tests show that both types of Ni-SiOC nanocomposites exhibit high strength and good plastic flow stability due to microstructure-promoted plastic co-deformation between amorphous ceramics and Ni grains. However, in-situ tension tests reveal that the core-shell nanostructures exhibit brittle fracture behaviour at a low strength due to cracking along amorphous cores, while the submicron-grained Ni can reach the similar strength to that of compression but a limited plasticity due to interface decohesion facilitated by deformation incompatibility between Ni and amorphous ceramic SiOC.
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