Quantifying heterogeneous deformation in grain boundary regions on shock loaded tantalum using spherical and sharp tip nanoindentation
Abstract
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.
- Authors:
-
[1];
[1];
[1];
[1]
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Univ. of Minnesota-Twin Cities, Minneapolis, MN (United States)
- Publication Date:
- Research Org.:
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- USDOE Laboratory Directed Research and Development (LDRD) Program
- OSTI Identifier:
- 1477707
- Alternate Identifier(s):
- OSTI ID: 1636607
- Report Number(s):
- LA-UR-18-29241
Journal ID: ISSN 0921-5093
- Grant/Contract Number:
- AC52-06NA25396
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing
- Additional Journal Information:
- Journal Volume: 737; Journal Issue: C; Journal ID: ISSN 0921-5093
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; Spall; Hardness; Dynamic deformation; Grains and interfaces; Stress/strain measurements; Electron microscopy
Citation Formats
Weaver, Jordan S., Jones, David Robert, Li, Nan, Mara, Nathan, Fensin, Saryu Jindal, and Gray, III, George Thompson. Quantifying heterogeneous deformation in grain boundary regions on shock loaded tantalum using spherical and sharp tip nanoindentation. United States: N. p., 2018.
Web. https://doi.org/10.1016/j.msea.2018.09.075.
Weaver, Jordan S., Jones, David Robert, Li, Nan, Mara, Nathan, Fensin, Saryu Jindal, & Gray, III, George Thompson. Quantifying heterogeneous deformation in grain boundary regions on shock loaded tantalum using spherical and sharp tip nanoindentation. United States. https://doi.org/10.1016/j.msea.2018.09.075
Weaver, Jordan S., Jones, David Robert, Li, Nan, Mara, Nathan, Fensin, Saryu Jindal, and Gray, III, George Thompson. Fri .
"Quantifying heterogeneous deformation in grain boundary regions on shock loaded tantalum using spherical and sharp tip nanoindentation". United States. https://doi.org/10.1016/j.msea.2018.09.075. https://www.osti.gov/servlets/purl/1477707.
@article{osti_1477707,
title = {Quantifying heterogeneous deformation in grain boundary regions on shock loaded tantalum using spherical and sharp tip nanoindentation},
author = {Weaver, Jordan S. and Jones, David Robert and Li, Nan and Mara, Nathan and Fensin, Saryu Jindal and Gray, III, George Thompson},
abstractNote = {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.},
doi = {10.1016/j.msea.2018.09.075},
journal = {Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing},
number = C,
volume = 737,
place = {United States},
year = {2018},
month = {9}
}
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Figures / Tables:
Fig. 1: (a) schematic of shock loaded sample showing the cross-sectioned plane, shock-loaded axis, and nanoindentation axis. (b) standard stereographic triangle inverse pole figure (IPF) color key. (c) EBSD-IPF overlaid with image quality of the cross-sectioned plane. The crystallographic planes correspond to the indentation axis. The three grain boundaries aremore »
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