DISLOCATION EMISSION AND EQUATION OFENERGY BARRIERS AT MODEL I CRACK TIP
(National Laboratory of Plastic Forming Sim.ulatinn and Die &. Mould Technology Huazhong University of Science and Technology，Wuhan 430074)
Abstract: The propagation for the model I crack in aluminum single crystal has been directly stud-ied by is-situ TEM observation. The equation of energy harrier of the dislocation building-up and emis-sion at the model I crack tip has been established by means of Peierls-Nabarro dislocation model and starting from angle of energy. By means of calculation, the critical value of spontaneous emission of the dislocations from tip of the model I crack was obtained.
Key words: emission of dislocation propagation of crack Peierls-Nabarro dislocation model energy barriers model I crack