https://scholars.lib.ntu.edu.tw/handle/123456789/425039
標題: | A micromechanics study of competing mechanisms for creep fracture of zirconium diboride polycrystals | 作者: | Yu C.-H. Huang C.-W. Chen C.-S. Gao Y. CHUN-HWAY HSUEH CHUIN-SHAN CHEN |
關鍵字: | Cavitation;Creep fracture;Finite element analysis;Micromechanics | 公開日期: | 2013 | 卷: | 33 | 期: | 10 | 起(迄)頁: | 1625-1637 | 來源出版物: | Journal of the European Ceramic Society | 摘要: | 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. ? 2013 Elsevier Ltd. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/425039 | ISSN: | 09552219 | DOI: | 10.1016/j.jeurceramsoc.2013.03.007 |
顯示於: | 材料科學與工程學系 |
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