Micromechanics modeling of creep fracture of zirconium diboride-silicon carbide composites at 1400-1700?XC
Journal
Journal of the European Ceramic Society
Journal Volume
34
Journal Issue
16
Pages
4145-4155
Date Issued
2014
Author(s)
Abstract
The creep deformation of the ultra-high temperature ceramic composite ZrB2-20%SiC at temperatures from 1400 to 1700¢XC was studied by a micromechanical mode in which the real microstructure was adopted in finite element simulations. Based on the experiment results of the change of activation energy with respect to the temperature, a mechanism shift from diffusional creep-control for temperatures below 1500¢XC to grain boundary sliding-control for temperatures above 1500¢XC was concluded from simulations. Also, the simulation results revealed the accommodation of grain rotation and grain boundary sliding by grain boundary cavitation for creep at temperatures above 1500¢XC which was in agreement with experimental observations. ? 2014 Elsevier Ltd.
Subjects
Cavitation
Creep fracture
Finite element analysis
Grain boundary sliding
Micromechanics
Type
journal article