Modeling of Mechanical Properties of Advanced Nanostructured Ceramic Composites

摘要

Mechanical properties of advanced nanostructured ceramic composites are theoretically described with emphasis on the role of defects and interfaces (grain and interphase boundaries) as well as nanoscale effects in these processes occurring at various length scales. In particular, theoretical models are suggested describing (1) emission of partial dislocations from amorphous intergranular boundaries in ceramic nanocomposites; (2) the role of amorphous intergranular boundaries as toughening elements in nanoceramics; (3) combined effects of intergrain sliding and diffusion processes on ductility of nanoceramics; (4) the grain size effect on crack blunting in nanoceramics at elevated temperatures; (5) the strengthening effect of Y-junction nanotubes in ceramic nanocomposites; (6) nucleation of nanograins near crack tips and its role as a special toughening mechanism in ceramic nanocomposites; (7) generation of nanoscale tracks at defect configurations formed due to intergrain sliding in nanoceramics.