Abstract
The creep deformation of the ultra-high temperature ceramic composite ZrB2–20%SiC at temperatures from 1400 to 1700 ◦ C 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 ◦ C to grain boundary sliding-control for temperatures above 1500 ◦ C 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 ◦ C which was in agreement with
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