Dislocation Structure of 10° Low-Angle Tilt Grain Boundary in α-Al2O3


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Dislocation structure of 10º low-angle tilt grain boundary in α-Al2O3 has been observed by high-resolution electron microscopy (HRTEM). It was found that perfect <1120> edge dislocations, which are introduced to compensate the misorientation, dissociated into two mixed partial dislocations with {1120} stacking-fault in between. The distances between the two partials were estimated by the force balances between repulsive forces of periodical dislocations and attractive forces from stacking-fault. The stacking-fault energy for 10o low-angle tilt grain boundary was estimated to be much higher than the previously reported value.



Materials Science Forum (Volumes 558-559)

Edited by:

S.-J.L. Kang, M.Y. Huh, N.M. Hwang, H. Homma, K. Ushioda and Y. Ikuhara




E. Tochigi et al., "Dislocation Structure of 10° Low-Angle Tilt Grain Boundary in α-Al2O3", Materials Science Forum, Vols. 558-559, pp. 979-982, 2007

Online since:

October 2007




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