Application of MTS Model to the Strength of Heavily Deformed Metals

Abstract

AbstractThe use of extensive plastic deformation to strengthen metals – primarily through the reduction of grain size – has undergone extensive development over the past several decades (Meyers et al. Prog Mater Sci 51(4):427–556, 2006). Grain dimensions well under 1 μm can now be routinely achieved. This chapter treats the heavy deformation of metals as a unique processing route and investigates the use of the mechanical threshold stress constitutive model to describe the stress–strain behavior during processing and post processing. Several unique features comprising large-strain deformations are reviewed, including the introduction of linear strain hardening – termed Stage IV hardening – at high strains. Application of the MTS model to the deformation of copper, nickel, austenitic stainless steels, and tungsten is considered. The effects of crystallographic texture on the stress–strain curves are highlighted.KeywordsMechanical threshold stressLarge-strain processingMTS modelCopperNickelAustenitic stainless steelTungstenECAPTorsionGrain size reductionCrystallographic textureStage IV hardeningStructure evolution