Plastic Deformation

Superplastic Deformation

· In "normal" plastic deformation of a metal in which work-hardening occurs, neck formation causes the material to become unstable and fail at e ~ 0.5.
· In superplastic deformation, neck formation does not occur and e may be more than 100%.
· The photograph shows a titanium component for the

From: Clark and Flemings, "Advanced Materials and the Economy," Scientific American (1986)

F-15 being removed from a press after being shaped at about 900 C by superplastic deformation. For this process (T/ T_m) = 0.54.