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

Title: Quantifying heterogeneous deformation in grain boundary regions on shock loaded tantalum using spherical and sharp tip nanoindentation

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

Grain boundaries play an important role in the overall mechanical performance of metals and alloys; however, isolating the effects of individual grain boundaries remains rather challenging experimentally. In this work, wire-feed, electron beam additively manufactured tantalum is studied under shock loading conditions generating incipient spall damage. Three grain boundaries aligned parallel to the shock direction were isolated inside a single sample. Postmortem metallography showed voids preferentially appeared on two of the three grain boundaries which had high misorientation angles > 30° compared to the third grain boundary with a relatively lower misorientation angle < 10°. Nanoindentation in grain boundary regions for both pyramidal and spherical tips showed characteristically different strain hardening trends for each grain boundary. Significant local strain hardening is present on both sides of one high angle grain boundary, while strain softening is captured at the other high angle grain boundary. A negligible trend of either hardening or softening is shown in the vicinity of the single low angle grain boundary. As a result, this leads to the conclusion that the trend of strain hardening/softening in grain boundary regions is not monotonically correlated to the susceptibility of specific grain boundaries to an increased propensity for void damage.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Laboratory Directed Research and Development (LDRD) Program
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1477707
Alternate ID(s):
OSTI ID: 1636607
Report Number(s):
LA-UR-18-29241
Journal Information:
Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing, Vol. 737, Issue C; ISSN 0921-5093
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 11 works
Citation information provided by
Web of Science

References (47)

Why are some Interfaces in Materials Stronger than others? journal June 2014
Effect of loading direction on grain boundary failure under shock loading journal February 2014
Influence of grain boundary properties on spall strength: Grain boundary energy and excess volume journal October 2012
Effect of Crystalline Structure on Intergranular Failure During Shock Loading journal November 2013
Influence of boundary structure and near neighbor crystallographic orientation on the dynamic damage evolution during shock loading journal March 2013
Early stage dynamic damage and the role of grain boundary type journal May 2012
Effects of grain size and boundary structure on the dynamic tensile response of copper journal August 2011
Microstructural effects on damage evolution in shocked copper polycrystals journal September 2016
Influence of peak pressure and temperature on the structure/property response of shock- loaded Ta and Ta-10W journal October 1995
Mechanical characterization of grain boundaries using nanoindentation journal August 2014
Quantifying deformation processes near grain boundaries in α titanium using nanoindentation and crystal plasticity modeling journal November 2016
Incipient plasticity during nanoindentation at grain boundaries in body-centered cubic metals journal October 2005
Investigation of slip transmission behavior across grain boundaries in polycrystalline Ni 3 Al using nanoindentation journal January 2004
Nanoindentation-Induced Deformation Behavior in the Vicinity of Single Grain Boundary of Interstitial-Free Steel journal January 2005
Nanohardness of molybdenum in the vicinity of grain boundaries and triple junctions journal November 2008
Nanoindentation study of slip transfer phenomenon at grain boundaries journal March 2009
Nanohardness of copper in the vicinity of grain boundaries journal December 2002
Studies of grain boundary regions in deformed polycrystalline aluminum using spherical nanoindentation journal June 2016
Studying grain boundary regions in polycrystalline materials using spherical nano-indentation and orientation imaging microscopy journal August 2011
Metal Additive Manufacturing: A Review journal April 2014
An improved technique for determining hardness and elastic modulus using load and displacement sensing indentation experiments journal June 1992
Measurement of hardness and elastic modulus by instrumented indentation: Advances in understanding and refinements to methodology journal January 2004
Determination of the effective zero-point and the extraction of spherical nanoindentation stress–strain curves journal August 2008
Spherical nanoindentation stress–strain curves journal May 2015
Measuring the elastic properties of anisotropic materials by means of indentation experiments journal August 1994
Indentation modulus of elastically anisotropic half spaces journal May 1993
The correlation of the indentation size effect measured with indenters of various shapes journal April 2002
Indentation size effects in crystalline materials: A law for strain gradient plasticity journal March 1998
Understanding pop-ins in spherical nanoindentation journal October 2014
A different type of indentation size effect journal November 2008
A stochastic model for the size dependence of spherical indentation pop-in journal September 2013
Grain-scale measurement of slip resistances in aluminum polycrystals using spherical nanoindentation journal May 2015
Importance of surface preparation on the nano-indentation stress-strain curves measured in metals journal March 2009
Measurement of the local mechanical properties in polycrystalline samples using spherical nanoindentation and orientation imaging microscopy journal June 2009
Local Mechanical Property Evolution During High Strain-Rate Deformation of Tantalum journal November 2016
Mechanical characterization of Ti-6Al-4V titanium alloy at multiple length scales using spherical indentation stress-strain measurements journal December 2016
The Indentation Size Effect: A Critical Examination of Experimental Observations and Mechanistic Interpretations journal June 2010
Study of the interaction between the indentation size effect and Hall–Petch effect with spherical indenters on annealed polycrystalline copper journal March 2008
Investigations of orientation and length scale effects on micromechanical responses in polycrystalline zirconium using spherical nanoindentation journal March 2016
On capturing the grain-scale elastic and plastic anisotropy of alpha-Ti with spherical nanoindentation and electron back-scattered diffraction journal September 2016
The structure of high-angle grain boundaries journal November 1966
Grain-boundaries: Criteria of specialness and deviation from CSL misorientation journal January 1987
A Review of Strain Analysis Using Electron Backscatter Diffraction journal March 2011
Spherical nanoindentation of proton irradiated 304 stainless steel: A comparison of small scale mechanical test techniques for measuring irradiation hardening journal September 2017
Micromechanics of spall and damage in tantalum journal June 1996
Grain boundaries and interfaces in slip transfer journal August 2014
Grain Boundary Motion under Dynamic Loading: Mechanism and Large-Scale Molecular Dynamics Simulations journal September 2013

Cited By (3)

New Insights into the Microstructural Changes During the Processing of Dual-Phase Steels from Multiresolution Spherical Indentation Stress–Strain Protocols journal December 2019
A comparison of adiabatic shear bands in wrought and additively manufactured 316L stainless steel using nanoindentation and electron backscatter diffraction journal September 2019
Understanding and predicting damage and failure at grain boundaries in BCC Ta journal October 2019


Figures / Tables (9)