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Stochastic modeling of discontinuous dynamic recrystallization at finite strains in hcp metals

Tutcuoglu, A. D. and Vidyasagar, A. and Bhattacharya, K. and Kochmann, D. M. (2019) Stochastic modeling of discontinuous dynamic recrystallization at finite strains in hcp metals. Journal of the Mechanics and Physics of Solids, 122 . pp. 590-612. ISSN 0022-5096. http://resolver.caltech.edu/CaltechAUTHORS:20180926-083949101

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Abstract

We present a model that aims to describe the effective, macroscale material response as well as the underlying mesoscale processes during discontinuous dynamic recrystallization under severe plastic deformation. Broadly, the model brings together two well-established but distinct approaches – first, a continuum crystal plasticity and twinning approach to describe complex deformation in the various grains, and second, a discrete Monte-Carlo-Potts approach to describe grain boundary migration and nucleation. The model is implemented within a finite-strain Fast Fourier Transform-based framework that allows for efficient simulations of recrystallization at high spatial resolution, while the grid-based Fourier treatment lends itself naturally to the Monte-Carlo approach. The model is applied to pure magnesium as a representative hexagonal closed packed metal, but is sufficiently general to admit extension to other material systems. Results demonstrate the evolution of the grain architecture in representative volume elements and the associated stress–strain history during the severe simple shear deformation typical of equal channel angular extrusion. We confirm that the recrystallization kinetics converge with increasing grid resolution and that the resulting model captures the experimentally observed transition from single- to multi-peak stress–strain behavior as a function of temperature and rate.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1016/j.jmps.2018.09.032DOIArticle
ORCID:
AuthorORCID
Bhattacharya, K.0000-0003-2908-5469
Kochmann, D. M.0000-0002-9112-6615
Additional Information:© 2018 Elsevier Ltd. Received 30 April 2018, Revised 29 August 2018, Accepted 25 September 2018, Available online 26 September 2018. This research was sponsored by the Army Research Laboratory and was accomplished under Cooperative Agreement Number W911NF-12-2-0022. The views and conclusions contained in this document are those of the authors and should not be interpreted as representing the official policies, either expressed or implied, of the Army Research Laboratory or the U.S. Government. The U.S. Government is authorized to reproduce and distribute reprints for Government purposes notwithstanding any copyright notation herein.
Group:GALCIT
Funders:
Funding AgencyGrant Number
Army Research LaboratoryW911NF-12-2-0022
Subject Keywords:Recrystallization; Monte-Carlo; Homogenization; Magnesium; Polycrystal
Record Number:CaltechAUTHORS:20180926-083949101
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20180926-083949101
Official Citation:A.D. Tutcuoglu, A. Vidyasagar, K. Bhattacharya, D.M. Kochmann, Stochastic modeling of discontinuous dynamic recrystallization at finite strains in hcp metals, Journal of the Mechanics and Physics of Solids, Volume 122, 2019, Pages 590-612, ISSN 0022-5096, https://doi.org/10.1016/j.jmps.2018.09.032. (http://www.sciencedirect.com/science/article/pii/S0022509618303569)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:89948
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:26 Sep 2018 17:43
Last Modified:12 Oct 2018 22:38

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