skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Anisotropy and Strain Localization in Dynamic Impact Experiments of Tantalum Single Crystals

Journal Article · · Scientific Reports
 [1];  [1];  [1];  [2];  [1];  [1]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Deformation mechanisms in bcc metals, especially in dynamic regimes, show unusual complexity, which complicates their use in high-reliability applications. Here, we employ novel, high-velocity cylinder impact experiments to explore plastic anisotropy in single crystal specimens under high-rate loading. The bcc tantalum single crystals exhibit unusually high deformation localization and strong plastic anisotropy when compared to polycrystalline samples. Several impact orientations - [100], [110], [111] and [1¯49] - are characterized over a range of impact velocities to examine orientation-dependent mechanical behavior versus strain rate. Moreover, the anisotropy and localized plastic strain seen in the recovered cylinders exhibit strong axial symmetries which differed according to lattice orientation. Two-, three-, and four-fold symmetries are observed. We propose a simple crystallographic argument, based on the Schmid law, to understand the observed symmetries. These tests are the first to explore the role of single-crystal orientation in Taylor impact tests and they clearly demonstrate the importance of crystallography in high strain rate and temperature deformation regimes. These results provide critical data to allow dramatically improved high-rate crystal plasticity models and will spur renewed interest in the role of crystallography to deformation in dynamics regimes.

Research Organization:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC04-94AL85000
OSTI ID:
1473946
Report Number(s):
SAND-2018-9911J; 667749
Journal Information:
Scientific Reports, Vol. 8, Issue 1; ISSN 2045-2322
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 8 works
Citation information provided by
Web of Science

References (35)

A perspective on trends in multiscale plasticity journal September 2010
An analysis of nonuniform and localized deformation in ductile single crystals journal June 1982
Application of generalized non-Schmid yield law to low-temperature plasticity in bcc transition metals journal May 2013
An experimental statistical analysis of stress projection factors in BCC tantalum journal October 2013
Plastic deformation of tantalum single crystals journal July 1967
Plastic deformation of high-purity α-titanium: Model development and validation using the Taylor cylinder impact test journal January 2015
Temperature and strain-rate dependence of the flow stress of ultrapure tantalum single crystals journal November 1987
Physically-based strength model of tantalum incorporating effects of temperature, strain rate and pressure journal June 2016
Twinning in tantalum journal September 1959
Slip planes in bcc transition metals journal June 2013
Overview of constitutive laws, kinematics, homogenization and multiscale methods in crystal plasticity finite-element modeling: Theory, experiments, applications journal February 2010
The use of flat-ended projectiles for determining dynamic yield stress I. Theoretical considerations journal September 1948
Three-stage hardening in tantalum single crystals journal November 1965
Deformation of high purity tantalum single crystals at 4.2 K journal January 1975
Numerical simulation of Taylor impact tests journal December 2007
Crystallographic texture evolution in bulk deformation processing of FCC metals journal January 1992
Experimental and computational study of the impact deformation of titanium Taylor cylinder specimens journal March 1994
Interstitial solution hardening in tantalum single crystals journal December 1970
Orientation Dependence of Yield in Body-Centered Cubic Metals journal February 1967
Analysis of deformation twinning in tantalum single crystals under shock loading conditions journal February 2013
Shock-induced plasticity in tantalum single crystals: Interatomic potentials and large-scale molecular-dynamics simulations journal October 2013
Elastic-viscoplastic anisotropic modeling of textured metals and validation using the Taylor cylinder impact test journal June 2007
Optical investigation of anomalous slip-line patterns in high purity niobium and tantalum single crystals after tensile deformation at 77 K journal August 1985
Strain-rate dependence of ramp-wave evolution and strength in tantalum journal August 2016
A constitutive description of the deformation of copper based on the use of the mechanical threshold stress as an internal state variable journal January 1988
Transitioning rate sensitivities across multiple length scales: Microstructure-property relationships in the Taylor cylinder impact test on zirconium journal September 2016
Dislocation‐mechanics‐based constitutive relations for material dynamics calculations journal March 1987
Constitutive behavior of tantalum and tantalum-tungsten alloys journal October 1996
Model of plastic deformation for extreme loading conditions journal January 2003
Analysis of Plastic Deformation in a Steel Cylinder Striking a Rigid Target journal March 1954
Anomalous Slip in High-Purity Niobium and Tantalum Single Crystals journal February 1995
Strain localization in ductile single crystals journal October 1977
Low-symmetry plastic deformation in BCC tantalum: experimental observations, modeling and simulations journal April 2003
On the modeling of the Taylor cylinder impact test for orthotropic textured materials: experiments and simulations journal March 1999
Plastic deformation of tantalum single crystals journal February 1968

Similar Records

Orientation dependent spall strength of tantalum single crystals
Journal Article · Fri Aug 03 00:00:00 EDT 2018 · Acta Materialia · OSTI ID:1473946

Predicting extreme anisotropy and shape variations in impact testing of tantalum single crystals
Journal Article · Mon Jan 31 00:00:00 EST 2022 · International Journal of Solids and Structures · OSTI ID:1473946

Shock compression of molybdenum single crystals to 110 GPa: Elastic–plastic deformation and crystal anisotropy
Journal Article · Fri May 29 00:00:00 EDT 2020 · Journal of Applied Physics · OSTI ID:1473946

Related Subjects