A method for superplastic deformation of a blank from a metal alloy

摘要

A method of superplastically deforming a blank of a metallic alloy which:PP1. has a composition suitable for superplastic deformation andPP2. has a grain structure suitable for superplastic deformation andPP3. contains less than that percentage of a constituent known to inhibit grain coarsening after recrystallization which is necessary for such inhibition, P Pcomprising raising the blank to a forming temperature, deforming the blank at a first strain rate to induce dynamic recrystallization and continuing to deform the blank at a second strain rate lower than the first rate.