Fully coupled two-phase composite model for microstructure evolution during non-proportional severe plastic deformation

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Abstract

A fully coupled micro-macro interaction model is proposed for the grain refinement caused by severe plastic deformation of cell-forming metallic materials. The model is a generalization of a previously proposed two-phase composite model suggested for the evolution of dislocation populations corresponding to the interior of the dislocation cells and dislocation cell walls. Just as within the original framework, the evolution of the material microstructure depends on the applied hydrostatic pressure, strain rate, and the loading path. Backstresses are used to define a measure of the strain path change. Thereby, the model can describe the experimentally observed dissolution of dislocation cells and the reduction of dislocation densities occurring shortly after load path changes. The large strain kinematics is accounted for in a geometrically exact manner using the nested split of the deformation gradient tensor, proposed by Lion. Within the extended model, the macroscopic strength of the material depends on the microstructural parameters. In that sense, the new model is fully coupled. It is thermodynamically consistent, objective, and w-invariant under isochoric changes of the reference configuration. A physical interpretation is provided for the nested multiplicative split in terms of the two-phase microstructure composite model.

Original languageEnglish
Title of host publicationSuperplasticity in Advanced Materials - ICSAM 2018
PublisherTrans Tech Publications Ltd
Pages234-240
Number of pages7
Volume385 DDF
ISBN (Print)9783035713459
DOIs
Publication statusPublished - 1 Jan 2018
Event13th International Conference on Superplasticity in Advanced Materials, ICSAM 2018 - Petersburg, Russian Federation
Duration: 19 Aug 201822 Aug 2018

Conference

Conference13th International Conference on Superplasticity in Advanced Materials, ICSAM 2018
CountryRussian Federation
CityPetersburg
Period19.08.201822.08.2018

Keywords

  • Dislocation cells
  • Isotropic
  • Kinematic hardening
  • Microstructure evolution
  • Nested multiplicative split
  • Non-proportional loading
  • Severe plastic deformation

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