🗊Презентация Defect in solid

The number of vacancies (defect of Shotky) is given by formula: The number of vacancies (defect of Shotky) is given by formula: N- number of atom; n - number of vacancies; kB- constant of Boltzman, 1,38*10-23 J /K; T- temperature of solid; Ev- energy of formation defect of Shotky;

The number of defect of pair Frenkel is given by formula: The number of defect of pair Frenkel is given by formula: N-number of atom; N’- number of interstitial by can take up free atom; n- number of defects pair of Frenkel; kB- constant of Boltzman, 1,38*10-23 J /K; T- temperature of solid; Ef- energy of formation pair of Frenkel.

The experimental data do not show that the observed values of the yield strength are much smaller than the theoretical values. To explain this effect, a new type of defect was introduced, which the scientists called a dislocation. The experimental data do not show that the observed values of the yield strength are much smaller than the theoretical values. To explain this effect, a new type of defect was introduced, which the scientists called a dislocation. Dislocation is the region of localized lattice distortion which separates the slipped and unslipped portion of the crystal. The upper region of the crystal over the slip plane has slipped relative to the bottom portion.

The two types of dislocations are: The two types of dislocations are: Edge dislocation Screw dislocation

The other type of dislocation is the screw dislocation where the Burger vector is parallel to the dislocation line (AD). The trace of the atomic planes around the screw dislocation makes a spiral or helical path (pink shade) like a screw and hence, the name. The other type of dislocation is the screw dislocation where the Burger vector is parallel to the dislocation line (AD). The trace of the atomic planes around the screw dislocation makes a spiral or helical path (pink shade) like a screw and hence, the name.

Grain boundaries is surface defect. Grain boundaries is surface defect. Most crystalline solids are an aggregate of several crystals. Such materials are called polycrystalline. Each crystal is known as a grain. The boundary between the grains is the grain boundary.