Dislocation structure analysis in the strain gradient of torsion loading: a comparison between modelling and experiment
-
Published:2022-02-08
Issue:3
Volume:30
Page:035007
-
ISSN:0965-0393
-
Container-title:Modelling and Simulation in Materials Science and Engineering
-
language:
-
Short-container-title:Modelling Simul. Mater. Sci. Eng.
Author:
Stricker MarkusORCID,
Ziemann Michael,
Walter Mario,
Weygand Sabine M,
Gruber Patric,
Weygand DanielORCID
Abstract
Abstract
Complex stress states due to torsion lead to dislocation structures characteristic for the chosen torsion axis. The formation mechanism of these structures and the link to the overall plastic deformation are unclear. Experiments allow the analysis of cross sections only ex situ or are limited in spacial resolution which prohibits the identification of the substructures which form within the volume. Discrete dislocation dynamics simulations give full access to the dislocation structure and their evolution in time. By combining both approaches and comparing similar measures the dislocation structure formation in torsion loading of micro wires is explained. For the ⟨100⟩ torsion axis, slip traces spanning the entire sample in both simulation and experiment are observed. They are caused by collective motion of dislocations on adjacent slip planes. Thus these slip traces are not atomically sharp. Torsion loading around a ⟨111⟩ axis favors plasticity on the primary slip planes perpendicular to the torsion axis and dislocation storage through cross-slip and subsequent collinear junction formation. Resulting hexagonal dislocation networks patches are small angle grain boundaries. Both, experiments and discrete dislocation simulations show that dislocations cross the neutral fiber. This feature is discussed in light of the limits of continuum descriptions of plasticity.
Funder
Ministry of Science, Research and Arts of Baden-Württemberg
German Research Foundation
Universities of the State of Baden-Württemberg, Germany
Subject
Computer Science Applications,Mechanics of Materials,Condensed Matter Physics,General Materials Science,Modeling and Simulation
Cited by
1 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献