Discrete twin evolution in Mg alloys using a novel crystal plasticity finite element model

Jiahao Cheng; Jinlei Shen; Raj K. Mishra; Somnath Ghosh

doi:10.1016/j.actamat.2018.02.032

Discrete twin evolution in Mg alloys using a novel crystal plasticity finite element model

Jiahao Cheng, Jinlei Shen, Raj K. Mishra, Somnath Ghosh

Research output: Contribution to journal › Article › peer-review

48 Scopus citations

Abstract

This paper implements the image-based crystal plasticity FE model with explicit twin evolution, developed in [1, 2], to study mechanisms of deformation and twinning in polycrystalline microstructures of the Mg alloy AZ31. The physics of twin nucleation, propagation and interaction with slip systems are represented in the constitutive formulation and implemented in a FE code. Image-based simulations are conducted for statistically equivalent representative volume elements, for which the morphological and crystallographic parameters are statistically equivalent to those observed in EBSD data of experimental samples. Validation studies show satisfactory agreement of the stress-strain response with experiments. Analyses of deformation in AZ31 reveal various deformation mechanisms captured by the model. An important contribution of this paper is in the exploration of various twin-related local phenomenon and deformation mechanisms using tricrystalline and polycrystalline models. Several underlying mechanisms are revealed through these simulations.

Original language	English
Pages (from-to)	142-153
Number of pages	12
Journal	Acta Materialia
Volume	149
DOIs	https://doi.org/10.1016/j.actamat.2018.02.032
State	Published - May 1 2018
Externally published	Yes

Funding

This work has been partially supported by a GOALI research program sponsored by the National Science Foundation , Mechanics and Structure of Materials Program through Grant No. CMMI-1100818 (Program Manager: Dr. Kara Peters). The first and the corresponding authors have also been supported by a grant by Pratt & Whitney (Program Manager: Dr. V. Venkatesh). The authors gratefully acknowledge this support. Computing support by the Homewood High Performance Compute Cluster (HHPC) and Maryland Advanced Research Computing Center (MARCC) is gratefully acknowledged. This work has been partially supported by a GOALI research program sponsored by the National Science Foundation, Mechanics and Structure of Materials Program through Grant No. CMMI-1100818 (Program Manager: Dr. Kara Peters). The first and the corresponding authors have also been supported by a grant by Pratt & Whitney (Program Manager: Dr. V. Venkatesh). The authors gratefully acknowledge this support. Computing support by the Homewood High Performance Compute Cluster (HHPC) and Maryland Advanced Research Computing Center (MARCC) is gratefully acknowledged.

Funders	Funder number
GOALI
HHPC
Homewood High Performance Compute Cluster
Maryland Advanced Research Computing Center
National Science Foundation , Mechanics and Structure of Materials
National Science Foundation	CMMI-1100818
Pratt & Whitney

Keywords

Crystal plasticity FEM
Lattice slip
Mg alloys
SERVE
Twinning

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10.1016/j.actamat.2018.02.032

Cite this

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title = "Discrete twin evolution in Mg alloys using a novel crystal plasticity finite element model",

abstract = "This paper implements the image-based crystal plasticity FE model with explicit twin evolution, developed in [1, 2], to study mechanisms of deformation and twinning in polycrystalline microstructures of the Mg alloy AZ31. The physics of twin nucleation, propagation and interaction with slip systems are represented in the constitutive formulation and implemented in a FE code. Image-based simulations are conducted for statistically equivalent representative volume elements, for which the morphological and crystallographic parameters are statistically equivalent to those observed in EBSD data of experimental samples. Validation studies show satisfactory agreement of the stress-strain response with experiments. Analyses of deformation in AZ31 reveal various deformation mechanisms captured by the model. An important contribution of this paper is in the exploration of various twin-related local phenomenon and deformation mechanisms using tricrystalline and polycrystalline models. Several underlying mechanisms are revealed through these simulations.",

keywords = "Crystal plasticity FEM, Lattice slip, Mg alloys, SERVE, Twinning",

author = "Jiahao Cheng and Jinlei Shen and Mishra, {Raj K.} and Somnath Ghosh",

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AU - Cheng, Jiahao

AU - Shen, Jinlei

AU - Mishra, Raj K.

AU - Ghosh, Somnath

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Y1 - 2018/5/1

N2 - This paper implements the image-based crystal plasticity FE model with explicit twin evolution, developed in [1, 2], to study mechanisms of deformation and twinning in polycrystalline microstructures of the Mg alloy AZ31. The physics of twin nucleation, propagation and interaction with slip systems are represented in the constitutive formulation and implemented in a FE code. Image-based simulations are conducted for statistically equivalent representative volume elements, for which the morphological and crystallographic parameters are statistically equivalent to those observed in EBSD data of experimental samples. Validation studies show satisfactory agreement of the stress-strain response with experiments. Analyses of deformation in AZ31 reveal various deformation mechanisms captured by the model. An important contribution of this paper is in the exploration of various twin-related local phenomenon and deformation mechanisms using tricrystalline and polycrystalline models. Several underlying mechanisms are revealed through these simulations.

AB - This paper implements the image-based crystal plasticity FE model with explicit twin evolution, developed in [1, 2], to study mechanisms of deformation and twinning in polycrystalline microstructures of the Mg alloy AZ31. The physics of twin nucleation, propagation and interaction with slip systems are represented in the constitutive formulation and implemented in a FE code. Image-based simulations are conducted for statistically equivalent representative volume elements, for which the morphological and crystallographic parameters are statistically equivalent to those observed in EBSD data of experimental samples. Validation studies show satisfactory agreement of the stress-strain response with experiments. Analyses of deformation in AZ31 reveal various deformation mechanisms captured by the model. An important contribution of this paper is in the exploration of various twin-related local phenomenon and deformation mechanisms using tricrystalline and polycrystalline models. Several underlying mechanisms are revealed through these simulations.

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Discrete twin evolution in Mg alloys using a novel crystal plasticity finite element model

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Keywords

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