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{0001}<10 1 0> Slip and Basal Twinning in Sapphire Single Crystals Shock‐Loaded at Room Temperature
Author(s) -
Wang Yucong,
Mikkola Donald E.
Publication year - 1992
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1992.tb04418.x
Subject(s) - crystal twinning , sapphire , slip (aerodynamics) , transmission electron microscopy , materials science , basal plane , perpendicular , dislocation , condensed matter physics , microstructure , shock (circulatory) , crystallography , composite material , optics , chemistry , geometry , physics , nanotechnology , thermodynamics , medicine , laser , mathematics
The microstructures of sapphire single crystals explosively shocked at pressures of 5, 12, and 23 GPa, with the basal plane perpendicular to the shock wave direction, have been studied using transmission electron microscopy. There was no evidence of microplastic deformation, dislocations or twins, for crystals shocked at 5 GPa. Perfect dislocations with 10 1 0 and ⅓11 2 0 Burgers vectors on the basal planes were observed at the higher pressures. The gliding of 10 1 0 dislocations on the basal plane established the activation of {0001}10 1 0 slip, which has not been experimentally verified previously. In addition to dislocation generation and motion, a significant number of basal twins were observed.