Вплив структурних факторів на характеристику пластичності

Abstract

The main theoretical standson the plasticity characteristic, which is determined by the proportion of plastic deformation in the total defo stands rmation and characterizes the ability of the material to undergo plastic deformation, were developed by Profes-sor Yu. V. Milman. This article is devoted to the experimental verification of theoretical statements about the influence of structural factors on the plasticity characteristic, which can be determined from measurements of hardness (H) and during standard mechanical tests (*). The study was performed on materials with different levels of plasticity (ARMCO–Fe, aluminum alloys AMg5, 7075 and monocrystalline silicon). ARMCO-Fe and aluminum alloy 7075 have different plasticity, but in the investigated range of grain change values (ARMCO–Fe d = 20—550 μm, aluminum alloy 7075 d = = 4—60 μm), the dependence of the plasticity characteristic on d is linear. ARMCO-Fe and aluminum alloy 7075 have different plasticity, but within the investigated range of grain sizes (ARMCO-Fe: d = 20—550 µm, aluminum alloy 7075: d = 4—50 µm), the change in plasticity characteristics in regard to grain size has linear dependences. The resulting dependences of the plasticity characteristic H and * on structural factors showed that a decrease in the grain size and an increase in the density of dislocations, which increase the yield strength of the material, lead to a decrease in the plasticity characteristic. The comparison of experimental data with theoretical ideas about the influence of structural factors on the plasticity characteristic showed a satisfactory match between the theory and the experiment (which will impact to the further development of the theory of the dependence of plasticity on other structural and external factors). Keywords: mechanical properties, plasticity, structure, dislocation density.