Physicomechanical properties of hardened copper-aluminum-zincβ-alloys with an intermediate structure

The hardenability for two hardening rates (water and air) and also the influence of diffusion transformation products on their damping capacity and mechanical properties are investigated in a broad concentration area of copper-aluminum-zinc system alloys. The general character of the change in microstructure and hardness with distance from the specimen surface is determined. The relationship of hardenability of alloys of the investigated system to their composition for two hardening rates is established. It is shown that with water hardening these alloys possess high and with air hardening insufficient hardenability. It is determined that formation in hardening in the structure of the alloys of products of diffusion decomposition of the matrix phase reduces their damping capacity and mechanical properties.