Correlation between yield stress and microhardness in crystals such as NaCl

The correlation between yield stress (τy) and microhardness (H) is investigated for KCl, NaCl, NaF, LiF crystals having different degrees of rigidity. It is found that the dependence τy = = a(H — H0) is valid in temperature hardening for all the crystals under investigation, where a and H0 are the constants of the material. In the case of lattice hardening H0 = 0. In spite of the linear dependence between τy and H in some cases the change of these characteristics is connected with different parameters and processes of plastic deformation. [Russian Text Ignored].