DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Modeling of intragranular misorientation and grain fragmentation in polycrystalline materials using the viscoplastic self-consistent formulation

Abstract

In this paper, the recently established methodology to use known algorithmic expressions of the second moments of the stress field in the grains of a polycrystalline aggregate for calculating average fluctuations of lattice rotation rates and the associated average intragranular misorientation distributions using the mean-field viscoplastic self-consistent (VPSC) formulation is extended to solve the coupled problem of considering the effect of intragranular misorientations on stress and rotation rate fluctuations. In turn, these coupled expressions are used to formulate and implement a grain fragmentation (GF) model in VPSC. Case studies, including tension and plane-strain compression of face-centered cubic polycrystals are used to illustrate the capabilities of the new model. GF-VPSC predictions of intragranular misorientation distributions and texture evolution are compared with experiments and full-field numerical simulations, showing good agreement. In particular, the inclusion of misorientation spreads reduced the intensity of the deformed texture and thus improved the texture predictions. Finally and moreover, considering that intragranular misorientations act as driving forces for recrystallization, the new GF-VPSC formulation is shown to enable modeling of microstructure evolution during deformation and recrystallization, in a computationally efficient manner.

Authors:
 [1];  [2];  [2];  [1]
  1. Univ. of New Hampshire, Durham, NH (United States). Dept. of Mechanical Engineering
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE; LANL Laboratory Directed Research and Development (LDRD) Program; National Science Foundation (NSF)
OSTI Identifier:
1457281
Alternate Identifier(s):
OSTI ID: 1702167
Report Number(s):
LA-UR-18-23679
Journal ID: ISSN 0749-6419
Grant/Contract Number:  
AC52-06NA25396; CMMI-1650641; 388715; 20180441ER
Resource Type:
Accepted Manuscript
Journal Name:
International Journal of Plasticity
Additional Journal Information:
Journal Volume: 109; Journal ID: ISSN 0749-6419
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; microstructures; crystal plasticity; viscoplastic material; numerical algorithms; GF-VPSC

Citation Formats

Zecevic, Miroslav, Lebensohn, Ricardo A., McCabe, Rodney J., and Knezevic, Marko. Modeling of intragranular misorientation and grain fragmentation in polycrystalline materials using the viscoplastic self-consistent formulation. United States: N. p., 2018. Web. doi:10.1016/j.ijplas.2018.06.004.
Zecevic, Miroslav, Lebensohn, Ricardo A., McCabe, Rodney J., & Knezevic, Marko. Modeling of intragranular misorientation and grain fragmentation in polycrystalline materials using the viscoplastic self-consistent formulation. United States. https://doi.org/10.1016/j.ijplas.2018.06.004
Zecevic, Miroslav, Lebensohn, Ricardo A., McCabe, Rodney J., and Knezevic, Marko. Fri . "Modeling of intragranular misorientation and grain fragmentation in polycrystalline materials using the viscoplastic self-consistent formulation". United States. https://doi.org/10.1016/j.ijplas.2018.06.004. https://www.osti.gov/servlets/purl/1457281.
@article{osti_1457281,
title = {Modeling of intragranular misorientation and grain fragmentation in polycrystalline materials using the viscoplastic self-consistent formulation},
author = {Zecevic, Miroslav and Lebensohn, Ricardo A. and McCabe, Rodney J. and Knezevic, Marko},
abstractNote = {In this paper, the recently established methodology to use known algorithmic expressions of the second moments of the stress field in the grains of a polycrystalline aggregate for calculating average fluctuations of lattice rotation rates and the associated average intragranular misorientation distributions using the mean-field viscoplastic self-consistent (VPSC) formulation is extended to solve the coupled problem of considering the effect of intragranular misorientations on stress and rotation rate fluctuations. In turn, these coupled expressions are used to formulate and implement a grain fragmentation (GF) model in VPSC. Case studies, including tension and plane-strain compression of face-centered cubic polycrystals are used to illustrate the capabilities of the new model. GF-VPSC predictions of intragranular misorientation distributions and texture evolution are compared with experiments and full-field numerical simulations, showing good agreement. In particular, the inclusion of misorientation spreads reduced the intensity of the deformed texture and thus improved the texture predictions. Finally and moreover, considering that intragranular misorientations act as driving forces for recrystallization, the new GF-VPSC formulation is shown to enable modeling of microstructure evolution during deformation and recrystallization, in a computationally efficient manner.},
doi = {10.1016/j.ijplas.2018.06.004},
journal = {International Journal of Plasticity},
number = ,
volume = 109,
place = {United States},
year = {Fri Jun 15 00:00:00 EDT 2018},
month = {Fri Jun 15 00:00:00 EDT 2018}
}

Journal Article:

Citation Metrics:
Cited by: 36 works
Citation information provided by
Web of Science

Figures / Tables:

Fig. 1 Fig. 1: Evolution of: (1) the mean grain orientation, (2) the orientation at a material point x and (3) the misorientation at the material point x during orientation update from time $t$ to time $t$ +$∆t$.. The increment in rotation is decomposed into two rotations: the mean increment in rotation,more » $\bar{q} ^{t(r)}_{inc}$ , and the increment in misorientation, $δq ^{t}_{inc}$(x), which are applied sequentially in two steps.« less

Save / Share: