Bending strength Recovery and Crack Healing behavior of Al_2O_3/SiC Nanocomposites at Different Annealing Temperatures

摘要

Al_2O_3/iC nanocomposites with different relative densities were investigated the bending strength recovery and crack healing behavior in annealing. Vicker's indentation method was used to introduce the controlled cracks. Changes in the four-point bending strength of the sample with indentation were used to evaluate the healing effects indirectly. It was found that healing increased strongly as annealing temperature increased above 850 deg. C. After annealing at 1150 deg. C for one hour, all indented samples with different relative density recovered their original bending strength almost completely.