Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1475210 | Journal of the European Ceramic Society | 2009 | 9 Pages |
Abstract
Inelastic deformation features induced in an ultra-high temperature ceramic composite, ZrB2-SiC, due to static indentation (rate of deformation of the order of 10â5Â sâ1), dynamic indentation (rate of deformation of the order of 103Â sâ1), and high-velocity scratch (500Â mm/s) experiments are presented. It was found that this ceramic composite has up to 30% higher dynamic hardness compared to static hardness. Dynamic indentations resulted in extensive transgranular microcracking within the indented regions compared to static indentations. In addition, significant plastic deformation features in terms of slip-line formation were observed within statically and dynamically indented regions. The high-velocity scratch studies revealed extensive transgranular microcracking perpendicular to the scratch direction and slip-lines in and around the scratch path. Preliminary transmission electron microscopy (TEM) observations from regions of slip-lines surrounding the scratch grooves revealed dislocation activity in the composite.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Dipankar Ghosh, Ghatu Subhash, Gerald R. Bourne,