Titanium Superplastic Forming Behavior
The capability of fine-grained titanium alloys to exhibit extremely large plastic strains without necking at specific high temperatures and low strain rates. This enables the fabrication of complex component geometries.
Titanium superplasticity is a special case that occurs in certain fine-grained titanium alloys. If you deform the material within a narrow temperature window and at a very slow strain rate, it behaves extremely ductile and can be formed into complex shapes without cracking. When welding, you have to be careful: if too much heat is applied or you deform the part too quickly, you lose this effect and the material cracks. This is more for superplastic forming, not for normal welding. If you want to use it, you need uniform heating and must control the deformation slowly and steadily. Hot spots or jerky pulling are fatal to the microstructure.