Anisotropic flow and fracture in beryl Be3Al2(SiO3)6

摘要

Flow and fracture resulting from Vickers indentation testing on {0 0 0 1} and {10$$bar 1$$0 } planar orientations have been examined. Flow characterized by indent shape differentiation was analysed to belong to the slip system with planes of the types { 10$$bar 1$$0} and {11$$bar 2$$0}. The ensuing fracture paths were resolved to propagate along {1 0$$bar 1$$0} and {1 1$$bar 2$$} cleavage planes whileKcvalues obtained for them were 0.196 and 0.248 MPam1/2, respectively.