Physical Nature of Brittle Strength Anisotropy of Deformed Metal

摘要

Elementary processes of the crack nucleation and growth in textured poly-crystal are considered. It is shown that crystallographic texture results in non-uniform distribution of the crack nucleus orientations. This is the main cause for anisotropy of brittle fracture stress of deformed metal. It is ascertained that effect of "oriented" microstresses gives rise to increase in brittle strength anisotropy of polycrystal. Based on above mentioned, influence of small plastic strains preceding fracture on the value of anisotropy of fracture stress of metals and alloys is analysed.