A model for microstructure evolution in adiabatic shear bands

Joy A. Hines, Kenneth S. Vecchio, Said Ahzi

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Abstract

A mechanical subgrain rotation model is proposed to account for the recrystallized grains which have been observed to form in adiabatic shear bands in a number of materials. The model is based on a "bicrystal" approach using crystal plasticity theory to predict the evolution of subgrain misorientations. These mechanically induced rotations are shown to occur at the high strain rate associated with adiabatic shear band formation. Recrystallized grain formation is proposed to occur by the formation and mechanical rotation of subgrains during deformation, coupled with boundary refinement via diffusion during shear band cooling. This model is referred to as progressive subgrain misorientation recrystallization and appears to account for shear band microstructures in a variety of metals.

Original languageEnglish
Pages (from-to)191-203
Number of pages13
JournalMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume29
Issue number1
Publication statusPublished - 1998
Externally publishedYes

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ASJC Scopus subject areas

  • Materials Science(all)
  • Metals and Alloys

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