Influence of the Forming Temperature on the Microstructure and Mechanical Properties of Extruded Ti6Al4V Rods

Abstract

The extrusion of Ti6Al4V has to be done at temperatures above 900°C. It is known for the rolling and forging of dual phase titanium alloys that the process temperature has an influence on the resulting texture and microstructure. Through extrusion trials at temperatures between 920°C and 1000°C the influence of the process temperature during extrusion was investigated. The extrusion trials were performed on the 8 MN direct and indirect extrusion press of the Extrusion Research and Development Center of the TU Berlin. This press is equipped with load cells thus, the influence of the temperature on the deformation resistance and therefore on the extrusion process could be investigated. The direct extruded rods with a diameter of 19 mm were then analyzed for their microstructure (grain size, phase distribution), texture and mechanical properties (Young's modulus, yield strength).