A micromechanics study of competing mechanisms for creep fracture of zirconium diboride polycrystals

Chi Hua Yu, Chang Wei Huang, Chuin Shan Chen, Yanfei Gao, Chun Hway Hsueh

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)1625-1637
Number of pages13
JournalJournal of the European Ceramic Society
Volume33
Issue number10
DOIs
Publication statusPublished - 2013 Sep

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

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