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Title: Orientation dependent spall strength of tantalum single crystals

Journal Article · · Acta Materialia

We report that it is generally recognized that single crystals exhibit orientation-dependent elastic and plastic responses. However, it is less known how the dynamic tensile, or spall, strength depends on crystalline orientation, especially for BCC materials. It has been previously shown that the dynamic tensile strength of FCC materials is highly dependent on their plastic response under compression, with a direct correlation between plastic deformation and spall strength. In BCC materials like Ta, where the primary deformation mechanism at high strain rates is a combination of slip and twinning, the quantitative dependence of spall strength on these deformation mechanisms is less understood. To fill this gap in our knowledge, a series of non-equilibrium molecular dynamics simulations are completed for six tantalum single crystal orientations: <001>, <011>, <111>, <013>, <112>, <149>, to explore the role of directional anisotropy on ductile spallation. Our results show that due to the role of non-Schmid and release effects in BCC Ta, the evolution of plasticity follows a complex trajectory through shock compression, release, and tension. Orientations that contain residual twinning deformation have a reduced spall strength proportional to the amount of twinning present. Lastly, twins and their intersections function as regions of increased stress localization within the system due to compatibility requirements and their interactions with dislocations.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); USDOE Laboratory Directed Research and Development (LDRD) Program
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1467282
Alternate ID(s):
OSTI ID: 1703855
Report Number(s):
LA-UR-18-22656
Journal Information:
Acta Materialia, Vol. 159, Issue C; ISSN 1359-6454
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 50 works
Citation information provided by
Web of Science

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Cited By (4)

Understanding and predicting damage and failure at grain boundaries in BCC Ta journal October 2019
Unraveling the Role of Interfaces on the Spall Failure of Cu/Ta Multilayered Systems journal January 2020
Influence of defects on the shock Hugoniot of tantalum journal June 2019
Computational Analysis Methods in Atomistic Modeling of Crystals journal December 2013

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