23-02U

A modified Griffiths model was considered for the description of microcracks (MCR) formation with taking into account the thermally activated surface diffusion of particles along the crack edges. We analyzed in detail a case when the foreign guest-particle enters the microdefect. This particle can not only push the edges of MCR apart, but also form certain interatomic bonds of an attractive nature with the parent host-particles, that form the exterior of the microdefect. The results are obtained both by numerical calculations and in the form of certain analytical expressions. The latter makes it possible to find out the reasons for a peculiar behavior of the characteristic lengths and depths of the potential wells on the profiles of the total surface energy of MCR, which remain out of frame when using the numerical methods only.