Patent ID: 6350329
Filing Date: 2002-02-26
Classification: C21D,C22F

Abstract:
A method for producing a superplastic alloy, said method comprising:providing an alloy for processing, said alloy comprising a matrix phase and at least two alloying elements, at least one of said alloying elements being, or being capable of forming, a dispersoid phase substantially insoluble in said matrix phase; solution heat treating said alloy; cooling the alloy to form a supersaturated solid solution; plastically deforming said alloy in a first deformation step sufficiently to form a high-energy defect structure, thereby forming nucleation sites useful for the subsequent nucleation of precipitates; aging said alloy, thereby forming precipitates at said nucleation sites; and plastically deforming said alloy in a second deformation step, and statically recrystallizing said alloy, through a particle-stimulated nucleation process.