INFLUENCE OF DEFORMATION CONDITIONS ON PROPERTIES OF SHEETS OF BERYLLIUM OF DIFFERENT PYRITY

The present research objective is studying of improvement possibility of mechanical properties and plasticity of sheets made of from cast distilled beryllium by a way of increase an initial material purity, by deformation and heat treatment. Structure and properties of three grades of beryllium sheets having different purity are studied in dependence on rolling and subsequent heat treatment conditions. Sheet beryllium having high mechanical characteristics has been produced by high-temperature rolling with strictly supervised annealings. High-temperature deformation of beryllium promotes plasticity increase, both in sheet plane, and in crosswise direction (tests on a bending). Electron microscope researches have shown that increase of mechanical properties of beryllium is connected with formation during high-temperature deformation of well-generated cellular substructure in beryllium sheets.