Deformation of Extruded Titanium Alloys Under Superplastic Conditions

摘要

The potential cost and weight savings associated with superplastic forming of thin Ti-6A1-4V sheet structures (1) has led to increased interest in the forming of other product forms such as bar and extruded sections. However, compared with thin sheet, extruded Ti-6A1-4V alloy has a coarser and less uniform microstructure which would tend to be less superplastic than sheet. The M-values, microstructure and deformation behaviour of an extruded U-channel section in IMI 550 and IMI 318 has been studied under conditions that produce superplasticity in these alloys in thin sheet form. The results are compared with those obtained for bar and sheet. Great Britain. (jes)