TY - JOUR
T1 - A micromechanics study of competing mechanisms for creep fracture of zirconium diboride polycrystals
AU - Yu, Chi Hua
AU - Huang, Chang Wei
AU - Chen, Chuin Shan
AU - Gao, Yanfei
AU - Hsueh, Chun Hway
N1 - Funding Information:
The research was supported by AFOSR Grant No. FA9550-09-1-0200 , National Science Council , Taiwan under Contract No. NSC100-2221-E-002-129 , and National Science Foundation CMMI 0926798. We are grateful to the National Center for High-performance Computing and Simutech Solution Corporation for providing the computational resources. We would also like to express our sincere gratitude to Professors Ken White and P. Sharma (University of Houston) for their enlightening comments and discussions.
PY - 2013/9
Y1 - 2013/9
N2 - A micromechanics model was developed to simulate creep fracture of ceramics at high temperatures and material properties pertinent to zirconium diboride (ZrB2) were adopted in the simulation. Creep fracture is a process of nucleation, growth, and coalescence of cavities along the grain boundaries in a localized and inhomogeneous manner. Based on the grain boundary cavitation process, creep fracture can be categorized into cavity nucleation-controlled and cavity growth-controlled processes. On the other hand, based on the deformation mechanism, the separation between two adjacent grain boundaries can be categorized into diffusion-controlled and creep-controlled mechanisms. In this study, a parametric study was performed to examine the effects of applied stress, cavity nucleation parameter, grain boundary diffusivity, and applied strain rate on cavity nucleation-controlled versus growth-controlled process as well as diffusion-controlled vs. creep-controlled mechanism during creep fracture of ZrB2.
AB - A micromechanics model was developed to simulate creep fracture of ceramics at high temperatures and material properties pertinent to zirconium diboride (ZrB2) were adopted in the simulation. Creep fracture is a process of nucleation, growth, and coalescence of cavities along the grain boundaries in a localized and inhomogeneous manner. Based on the grain boundary cavitation process, creep fracture can be categorized into cavity nucleation-controlled and cavity growth-controlled processes. On the other hand, based on the deformation mechanism, the separation between two adjacent grain boundaries can be categorized into diffusion-controlled and creep-controlled mechanisms. In this study, a parametric study was performed to examine the effects of applied stress, cavity nucleation parameter, grain boundary diffusivity, and applied strain rate on cavity nucleation-controlled versus growth-controlled process as well as diffusion-controlled vs. creep-controlled mechanism during creep fracture of ZrB2.
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U2 - 10.1016/j.jeurceramsoc.2013.03.007
DO - 10.1016/j.jeurceramsoc.2013.03.007
M3 - Article
AN - SCOPUS:84876729859
SN - 0955-2219
VL - 33
SP - 1625
EP - 1637
JO - Journal of the European Ceramic Society
JF - Journal of the European Ceramic Society
IS - 10
ER -