Multimodal 3D characterization of voids in shock-loaded tantalum: Implications for ductile spallation mechanisms

Toby Francis; Paul F. Rottmann; Andrew T. Polonsky; Marie Agathe Charpagne; McLean P. Echlin; Veronica Anghel; David R. Jones; George T. Gray; Marc De Graef; Tresa M. Pollock

doi:10.1016/j.actamat.2021.117057

Multimodal 3D characterization of voids in shock-loaded tantalum: Implications for ductile spallation mechanisms

Toby Francis, Paul F. Rottmann, Andrew T. Polonsky, Marie Agathe Charpagne, McLean P. Echlin, Veronica Anghel, David R. Jones, George T. Gray, Marc De Graef, Tresa M. Pollock

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

28 Scopus citations

Abstract

Predicting the failure of crystalline materials at high strain rates requires knowledge of the underlying failure mechanisms and their dependence on microstructure. In this study, a 3D-EBSD characterization experiment is performed on high-purity tantalum prior to and after partial spallation by plate impact, which allows for the statistical assessment of the microstructural neighborhoods surrounding incipient voids. In analyzing the resulting dataset containing 5884 grains and 467 voids, it is observed that the voids were roughly spherical and consistent in size throughout the spalled material. The voids are most likely to reside at quadruple points, at triple junctions, at grain boundaries, and within grains, in decreasing order of prevalence. Moreover, voids tend to form at grain boundaries with high degrees of plastic incompatibility, growing into the plastically soft grain but orienting primarily with or perpendicular to the loading direction. The statistics from these analyses of 3D microstructural data support dynamic cavitation models for ductile spallation.

Original language	English
Article number	117057
Journal	Acta Materialia
Volume	215
DOIs	https://doi.org/10.1016/j.actamat.2021.117057
State	Published - Aug 15 2021

Bibliographical note

Publisher Copyright:
© 2021 Acta Materialia Inc.

Funding

The authors would like to acknowledge the support of the Department of Energy, National Nuclear Security Administration under Award no. DE-NA0003857 and the Office of Naval Research under Award no. N00014-20-1-2788 . MDG acknowledges funding from a Department of Defense Vannevar-Bush Faculty Fellowship (N00014-16-1-2821), as well as the computational facilities of the Materials Characterization Facility at CMU under grant no. MCF-677785. The authors would also like to acknowledge fruitful conversations with Matthew Begley and John Hutchinson as well as the use of codes written by William Lenthe, including the Marching Cubes code.

Funders	Funder number
U.S. Department of Defense	N00014-16-1-2821
Office of Naval Research Naval Academy	N00014-20-1-2788
U.S. Department of Energy EPSCoR
National Nuclear Security Administration	DE-NA0003857
Mellon College of Science, Carnegie Mellon University	MCF-677785

Keywords

3D Characterization
Dynamic Behavior
Microstructure
Shock Loading
Spallation
Tantalum

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Polymers and Plastics
Metals and Alloys

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10.1016/j.actamat.2021.117057

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title = "Multimodal 3D characterization of voids in shock-loaded tantalum: Implications for ductile spallation mechanisms",

abstract = "Predicting the failure of crystalline materials at high strain rates requires knowledge of the underlying failure mechanisms and their dependence on microstructure. In this study, a 3D-EBSD characterization experiment is performed on high-purity tantalum prior to and after partial spallation by plate impact, which allows for the statistical assessment of the microstructural neighborhoods surrounding incipient voids. In analyzing the resulting dataset containing 5884 grains and 467 voids, it is observed that the voids were roughly spherical and consistent in size throughout the spalled material. The voids are most likely to reside at quadruple points, at triple junctions, at grain boundaries, and within grains, in decreasing order of prevalence. Moreover, voids tend to form at grain boundaries with high degrees of plastic incompatibility, growing into the plastically soft grain but orienting primarily with or perpendicular to the loading direction. The statistics from these analyses of 3D microstructural data support dynamic cavitation models for ductile spallation.",

keywords = "3D Characterization, Dynamic Behavior, Microstructure, Shock Loading, Spallation, Tantalum",

author = "Toby Francis and Rottmann, \{Paul F.\} and Polonsky, \{Andrew T.\} and Charpagne, \{Marie Agathe\} and Echlin, \{McLean P.\} and Veronica Anghel and Jones, \{David R.\} and Gray, \{George T.\} and \{De Graef\}, Marc and Pollock, \{Tresa M.\}",

note = "Publisher Copyright: {\textcopyright} 2021 Acta Materialia Inc.",

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day = "15",

doi = "10.1016/j.actamat.2021.117057",

language = "English",

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AU - Polonsky, Andrew T.

AU - Charpagne, Marie Agathe

AU - Echlin, McLean P.

AU - Anghel, Veronica

AU - Jones, David R.

AU - Gray, George T.

AU - De Graef, Marc

AU - Pollock, Tresa M.

PY - 2021/8/15

Y1 - 2021/8/15

N2 - Predicting the failure of crystalline materials at high strain rates requires knowledge of the underlying failure mechanisms and their dependence on microstructure. In this study, a 3D-EBSD characterization experiment is performed on high-purity tantalum prior to and after partial spallation by plate impact, which allows for the statistical assessment of the microstructural neighborhoods surrounding incipient voids. In analyzing the resulting dataset containing 5884 grains and 467 voids, it is observed that the voids were roughly spherical and consistent in size throughout the spalled material. The voids are most likely to reside at quadruple points, at triple junctions, at grain boundaries, and within grains, in decreasing order of prevalence. Moreover, voids tend to form at grain boundaries with high degrees of plastic incompatibility, growing into the plastically soft grain but orienting primarily with or perpendicular to the loading direction. The statistics from these analyses of 3D microstructural data support dynamic cavitation models for ductile spallation.

AB - Predicting the failure of crystalline materials at high strain rates requires knowledge of the underlying failure mechanisms and their dependence on microstructure. In this study, a 3D-EBSD characterization experiment is performed on high-purity tantalum prior to and after partial spallation by plate impact, which allows for the statistical assessment of the microstructural neighborhoods surrounding incipient voids. In analyzing the resulting dataset containing 5884 grains and 467 voids, it is observed that the voids were roughly spherical and consistent in size throughout the spalled material. The voids are most likely to reside at quadruple points, at triple junctions, at grain boundaries, and within grains, in decreasing order of prevalence. Moreover, voids tend to form at grain boundaries with high degrees of plastic incompatibility, growing into the plastically soft grain but orienting primarily with or perpendicular to the loading direction. The statistics from these analyses of 3D microstructural data support dynamic cavitation models for ductile spallation.

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KW - Microstructure

KW - Shock Loading

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Multimodal 3D characterization of voids in shock-loaded tantalum: Implications for ductile spallation mechanisms

Abstract

Bibliographical note

Funding

Keywords

ASJC Scopus subject areas

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