Yu C.H.Bird M.W.Huang C.W.Chen C.S.Gao Y.F.White K.W.CHUN-HWAY HSUEHCHUIN-SHAN CHEN2019-09-252019-09-25201409552219https://scholars.lib.ntu.edu.tw/handle/123456789/425058The creep deformation of the ultra-high temperature ceramic composite ZrB2-20%SiC at temperatures from 1400 to 1700¢XC 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¢XC to grain boundary sliding-control for temperatures above 1500¢XC 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¢XC which was in agreement with experimental observations. ? 2014 Elsevier Ltd.CavitationCreep fractureFinite element analysisGrain boundary slidingMicromechanicsjournal article10.1016/j.jeurceramsoc.2014.07.0202-s2.0-84924033057https://www2.scopus.com/inward/record.uri?eid=2-s2.0-84924033057&doi=10.1016%2fj.jeurceramsoc.2014.07.020&partnerID=40&md5=0e17a7430661ef0480d30e1e3f45df68