Texture variations in titanium alloys for aeroengine applications

Abstract

Electron backscatter diffraction techniques have been used to assess the range of textures that exist in a number of common titanium alloys. Crystal orientation maps and pole figures have been obtained over representative areas to study preferred textures and regions of common crystallography (macrozones). Electron backscatter diffraction analysis has established different relationships between optical microstructures and crystallographic texture for different titanium alloys. For β processed alloys, there is a correspondence between optical colonies of α platelets and regions of crystallographic alignment. Various texture intensities, macrozones and effective structural unit sizes can be observed depending on the alloy and product form. These variations impact on the mechanical behaviour of titanium alloys.