Materials Today: Proceedings | 2019
Structure and properties of hot-extruded tube of titanium alloy PT7M
Abstract
Abstract In this paper, the formation of the structure, texture, durometric and mechanical properties of the cross section of a hot-extruded tube made of titanium alloy PT-7\u202fM (Ti-2.2Al-2.7Zr, wt%) is considered. The structure, texture and properties of the tube with a diameter of 102\u202fmm and a thickness of 13\u202fmm is determined by the distribution of the temperature over the cross section of the billet during the deformation process. The cooling of the outer surface area of about 2.5\u202fmm of the billet during extrusion to temperatures of the α-region result to the formation of a structure from a predominantly deformed α-phase. Deformation heating during extrusion at a distance of more than 2.5\u202fmm from the outer surface to temperatures near β-transus result to the formation of β-transformed structure with lower strength and higher ductility as compared to the outer near-surface area.