Abstract
In extension of earlier studies on the production of percussion marks on diamond surface using a diamond sphere as indenter, it is now found that much softer materials than diamond can be used to produce pressure crack figures on diamond surfaces. Tungsten carbide and sapphire balls have produced cracking on an octahedral face of diamond, this face having been already shown to be the face of least resistance to this type of deformation. The cracks are of the same nature as those previously produced by a diamond indenter and the critical stress necessary is of the same order, but the cracks are on a bigger scale and have greater associated disturbance. The full development of a pressure crack is traced and multiple beam interference pictures show the extent of the surface damage. Three distinct types of cracking are found associated with each percussion mark and the mechanism of each is discussed in terms of cleavage, crystallographic shatter and cracks due to shock-wave propagation.
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