Dynamic recrystallization in adiabatic shear banding: Effective-temperature model and comparison to experiments in ultrafine-grained titanium

Dynamic recrystallization (DRX) is often observed in conjunction with adiabatic shear banding (ASB) in polycrystalline materials. The recrystallized nanograins in the shear band have few dislocations compared to the material outside of the shear band. In this paper, we reformulate the recently-devel...

Full description

Saved in:
Bibliographic Details
Published in:International journal of plasticity 2018-12, Vol.111, p.107-121
Main Authors: Lieou, Charles K.C., Bronkhorst, Curt A.
Format: Article
Language:English
Subjects:
Adiabatic flow
Banding
Constitutive behavior
Dynamic recovery
Dynamic recrystallization
Edge dislocations
ENGINEERING
Grain boundaries
MATERIALS SCIENCE
Polycrystals
Recrystallization
Shear banding
Shear bands
Stability
Temperature
Titanium
Ultrafines
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Dynamic recrystallization (DRX) is often observed in conjunction with adiabatic shear banding (ASB) in polycrystalline materials. The recrystallized nanograins in the shear band have few dislocations compared to the material outside of the shear band. In this paper, we reformulate the recently-developed Langer-Bouchbinder-Lookman (LBL) continuum theory of polycrystalline plasticity and include the creation of grain boundaries. While the shear-banding instability emerges because thermal heating is faster than heat dissipation, recrystallization is interpreted as an entropic effect arising from the competition between dislocation creation and grain boundary formation. We show that our theory closely matches recent results in sheared ultrafine-grained titanium. The theory thus provides a thermodynamically consistent way to systematically describe the formation of shear bands and recrystallized grains therein.
ISSN:0749-6419
1879-2154
DOI:10.1016/j.ijplas.2018.07.011