The role of deformation microstructure in recovery and recrystallization of heavily strained metals

Niels Hansen

Research output: Contribution to journalConference articleResearchpeer-review

Abstract

Metals deformed to high and ultrahigh strains are characterized by a nanoscale microstructure, a large fraction of high angle boundaries and a high dislocation density. Another characteristic of such a microstructure is a large stored energy that combines elastic energy due to dislocations and boundary energy. Parameters of the deformed microstructure significantly affect annealing processes such as recovery and recrystallization. For example, the recovery rate can be significantly increased after high strain deformation and restoration may occur as either discontinuous recrystallization or structural coarsening. A characterization and analysis of deformed and annealed microstructures presented in this work covers Al, Ni, Cu and Fe heavily deformed by rolling, accumulative roll bonding (ARB), equal channel angular extrusion (ECAE) and high pressure torsion (HPT). The important effect of recovery on subsequent restoration processes is discussed along with the effect of heterogeneities both on the local scale and on the sample scale. © (2012) Trans Tech Publications, Switzerland.
Original languageEnglish
JournalMaterials Science Forum
Volume715-716
Pages (from-to)251-258
ISSN0255-5476
DOIs
Publication statusPublished - 2012
Event4th International Conference on Recrystallization and Grain Growth - Sheffield, United Kingdom
Duration: 4 Jul 20109 Jul 2010

Conference

Conference4th International Conference on Recrystallization and Grain Growth
CountryUnited Kingdom
CitySheffield
Period04/07/201009/07/2010

Keywords

  • Compressible flow
  • Grain growth
  • Recovery
  • Recrystallization (metallurgy)
  • Restoration
  • Roll bonding
  • Thermodynamic stability
  • Microstructure

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