Influence of plastic properties on the grain size effect on twinning in Ti and Mg

Kumar, M. Arul; Beyerlein, Irene J.

doi:10.1016/j.msea.2019.138644

Title: Influence of plastic properties on the grain size effect on twinning in Ti and Mg

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Abstract

Deformation twinning is an inevitable mode of plastic deformation in hexagonal close packed (HCP) crystals and has been considered a hinderance to achieving formability and ductility. It has long been recognized that reductions in grain size can lower the propensity for twinning. In prior work, EBSD statistical analyses on big data sets of twins in pure Ti and Mg were carried out for the same twin type, loading conditions, initial texture, and range of grain sizes. Here, we revisit these data sets to investigate the role of material plastic properties on grain size effects on deformation twinning. We show that while reductions in grain size dramatically lower the number of twins per grain and the twin thickness in both metals, these effects are several times stronger in Ti than that for Mg. To rationalize this difference, full-field, 3D crystal plasticity calculations are performed. The analysis indicates that the stronger grain size effect in Ti arises due to the larger critical resolved shear stress (CRSS) of its easiest slip system, making Ti less accommodating of the twin shear than Mg. Overall, this result points to plastic properties as additional variables that can be tuned towards developing HCP materials for structural applications.

Authors:

^[1]; Beyerlein, Irene J. ^[2]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Univ. of California, Santa Barbara, CA (United States)

Publication Date:: Wed Nov 06 00:00:00 EST 2019

Research Org.:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Org.:: USDOE Office of Science (SC). Basic Energy Sciences (BES); National Science Foundation (NSF); USDOE

OSTI Identifier:: 1739963

Alternate Identifier(s):: OSTI ID: 1703702

Report Number(s):: LA-UR-19-21204
Journal ID: ISSN 0921-5093

Grant/Contract Number:: 89233218CNA000001; FWP-06SCPE401; CMMI-1729887; NSF CMMI-1729887

Resource Type:: Accepted Manuscript

Journal Name:: Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing

Additional Journal Information:: Journal Volume: 771; Journal ID: ISSN 0921-5093

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; Polycrystal; magnesium; titanium; plasticity; grain size

Citation Formats


                    Kumar, M. Arul, and Beyerlein, Irene J. Influence of plastic properties on the grain size effect on twinning in Ti and Mg.  United States: N. p., 2019. 
Web.  doi:10.1016/j.msea.2019.138644.

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                    Kumar, M. Arul, & Beyerlein, Irene J. Influence of plastic properties on the grain size effect on twinning in Ti and Mg.  United States.  https://doi.org/10.1016/j.msea.2019.138644

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                    Kumar, M. Arul, and Beyerlein, Irene J. Wed .  
"Influence of plastic properties on the grain size effect on twinning in Ti and Mg".  United States.  https://doi.org/10.1016/j.msea.2019.138644.  https://www.osti.gov/servlets/purl/1739963.

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@article{osti_1739963,

  title        = {Influence of plastic properties on the grain size effect on twinning in Ti and Mg},

  author       = {Kumar, M. Arul and Beyerlein, Irene J.},

  abstractNote = {Deformation twinning is an inevitable mode of plastic deformation in hexagonal close packed (HCP) crystals and has been considered a hinderance to achieving formability and ductility. It has long been recognized that reductions in grain size can lower the propensity for twinning. In prior work, EBSD statistical analyses on big data sets of twins in pure Ti and Mg were carried out for the same twin type, loading conditions, initial texture, and range of grain sizes. Here, we revisit these data sets to investigate the role of material plastic properties on grain size effects on deformation twinning. We show that while reductions in grain size dramatically lower the number of twins per grain and the twin thickness in both metals, these effects are several times stronger in Ti than that for Mg. To rationalize this difference, full-field, 3D crystal plasticity calculations are performed. The analysis indicates that the stronger grain size effect in Ti arises due to the larger critical resolved shear stress (CRSS) of its easiest slip system, making Ti less accommodating of the twin shear than Mg. Overall, this result points to plastic properties as additional variables that can be tuned towards developing HCP materials for structural applications.},

  doi          = {10.1016/j.msea.2019.138644},

  journal      = {Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing},

  number       = ,

  volume       = 771,

  place        = {United States},

  year         = {Wed Nov 06 00:00:00 EST 2019},

  month        = {Wed Nov 06 00:00:00 EST 2019}

}

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