Micromechanics modeling of creep fracture of zirconium diboride-silicon carbide composites at 1400-1700 degrees C

作者：Yu C H; Bird M W; Huang C W; Chen C S; Gao Y F; White K W; Hsueh C H^*

来源：Journal of the European Ceramic Society, 2014, 34(16): 4145-4155.

DOI：10.1016/j.jeurceramsoc.2014.07.020

• Creep fracture
• Finite element analysis
• Micromechanics
• Cavitation
• Grain boundary sliding

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

• 出版日期2014-12