Abstract:The properties and forming process of prealloyed powder metallurgy (PM) Ti-6Al-4V alloy were researched for application of high performance of titanium parts. Hot isostatic press (HIP) technology and two kinds of powders were used in the prealloyed processing to get full density material. Tensile properties, impact toughness and fracture toughness of PM Ti-6Al-4V alloy were studied and discussed. The microstructures were examined with optical microscope and the morphologies of powders were observed by SEM. Forming processes were performed to fabricate PM titanium parts. The experiment results show that the prealloyed PM Ti-6Al-4V alloy has same good properties as wrought material and the complex shape PM parts can be near-net-shaped. Some of the parts have been commercially used. This indicates that the prealloyed process should have bright prospects in making high-performance, complex shape and low-cost titanium alloy parts.

Key words: titanium alloy; Ti-6Al-4V; powder metallurgy; hot isostatic pressing; microstructure; property; near-net-shape