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

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

Authors :
V. Anghel
McLean P. Echlin
Marie-Agathe Charpagne
Andrew T. Polonsky
Paul F. Rottmann
David R. Jones
Toby Francis
Tresa M. Pollock
Marc De Graef
George T. Gray
Source :
Acta Materialia. 215:117057
Publication Year :
2021
Publisher :
Elsevier BV, 2021.

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.

Details

ISSN :
13596454
Volume :
215
Database :
OpenAIRE
Journal :
Acta Materialia
Accession number :
edsair.doi...........5e8e013b53d0d85b2300cd1435019c36
Full Text :
https://doi.org/10.1016/j.actamat.2021.117057