Effect of hydrostatic extrusion at 600-700°C on the structure and properties of Ti-6Al-4V alloy

Abstract

The effect of hydrostatic extrusion in the range 600–700° C on the structure and mechanical properties of Ti–6Al–4V titanium alloy with a lamellar microstructure is reported in the paper. Extrusion at 600°C resulted in the formation of a heterogeneous microstructure consisting of submicrocrystalline grains of size about 0.2 µm and thick lamellae aligned with the extrusion axis. An increase of the extrusion temperature increased the volume fraction of the globularized structure and the grain size. The hydrostatic extrusion leads to a remarkable increase in the strength of the alloy. The ultimate tensile strength of a sample extruded at 600° C to a true deformation of ｅ = 1.4 was 1530 MPa