STRENGTH PROPERTIES OF THE CU-2BE ALLOY SUBJECTED TO HPT

Abstract

Beryllium bronzes are one of the promising precipitation-hardening alloys widely used in industry for the manufacture of critical products. In this paper the effect of severe plastic deformation by high pressure torsion (HPT) and subsequent aging on the mechanical properties of the Cu-2Be alloy was investigated. The processing modes of the alloy in the solid solution state were divided into three main methods: aging of the initial state, HPT, HPT followed by aging. The microhardness of the samples was determined by the Vickers method. The samples were tested uniaxial tension for investigation the mechanical properties. The high strength state was achieved in the alloy subjected to HPT followed by aging at 300 °C for one hour. The results the fine structure investigation of samplesby transmission electron microscopy (TEM) made it possible to study the effect of plastic deformation and subsequent aging on grain sizes. Based on the results of the TEM investigation, it was determined that a nanostructure is being formed, and particles of secondary phases are also observed in the alloy after HPT. The results of this paper demonstrate the effect of HPT and subsequent aging on the formation of increased mechanical properties of the material and particles of secondary phases.