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Title: Studies of grain boundary regions in deformed polycrystalline aluminum using spherical nanoindentation

Abstract

Here, we use novel protocols based on spherical nanoindentation and orientation imaging microscopy (OIM) to quantify the local changes in slip resistances in the grain boundary regions of deformed, polycrystalline aluminum. The new protocols involve the use of the recently developed methods for extracting indentation stress–strain (ISS) curves from raw nanoindentation data in conjunction with the measurement of local microstructure at the indentation site using OIM to study the changes in the local slip resistances as a function of distance from the grain boundaries. Eight grain boundaries were selected for this work such that they included a broad range of boundaries, including low and high (grain-to-grain misorientation) angle boundaries as well as low, moderate, and high deviations in the Taylor factors of the grains on either side of the boundary. It was concluded that there was additional hardening in the grain boundary region when a Taylor ‘soft’ grain was present next to a Taylor ‘hard’ grain. This hardening was consistently observed on the soft grain side with one exception where hardening was observed on both sides of the boundary. A positive correlation was observed between the difference in Taylor factor across the boundary and the amount of hardening on themore » ‘soft’ grain side. However, no correlation was observed between the grain-to-grain misorientation angle and the extent of hardening at the grain boundary.« less

Authors:
 [1];  [2];  [3]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Drexel Univ., Philadelphia, PA (United States). Dept. of Materials Science and Engineering
  3. Georgia Inst. of Technology, Atlanta, GA (United States). Woodruff School of Mechanical Engineering
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Office of Nuclear Energy (NE)
OSTI Identifier:
1468570
Alternate Identifier(s):
OSTI ID: 1359205
Report Number(s):
LA-UR-15-26113
Journal ID: ISSN 0749-6419
Grant/Contract Number:  
AC52-06NA25396
Resource Type:
Accepted Manuscript
Journal Name:
International Journal of Plasticity
Additional Journal Information:
Journal Volume: 81; Journal Issue: C; Journal ID: ISSN 0749-6419
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 77 NANOSCIENCE AND NANOTECHNOLOGY; grain boundaries; microstructures; strengthening mechanisms; polycrystalline material; spherical nanoindentation

Citation Formats

Vachhani, Shraddha J., Doherty, Roger D., and Kalidindi, Surya R. Studies of grain boundary regions in deformed polycrystalline aluminum using spherical nanoindentation. United States: N. p., 2016. Web. doi:10.1016/j.ijplas.2016.01.001.
Vachhani, Shraddha J., Doherty, Roger D., & Kalidindi, Surya R. Studies of grain boundary regions in deformed polycrystalline aluminum using spherical nanoindentation. United States. doi:10.1016/j.ijplas.2016.01.001.
Vachhani, Shraddha J., Doherty, Roger D., and Kalidindi, Surya R. Mon . "Studies of grain boundary regions in deformed polycrystalline aluminum using spherical nanoindentation". United States. doi:10.1016/j.ijplas.2016.01.001. https://www.osti.gov/servlets/purl/1468570.
@article{osti_1468570,
title = {Studies of grain boundary regions in deformed polycrystalline aluminum using spherical nanoindentation},
author = {Vachhani, Shraddha J. and Doherty, Roger D. and Kalidindi, Surya R.},
abstractNote = {Here, we use novel protocols based on spherical nanoindentation and orientation imaging microscopy (OIM) to quantify the local changes in slip resistances in the grain boundary regions of deformed, polycrystalline aluminum. The new protocols involve the use of the recently developed methods for extracting indentation stress–strain (ISS) curves from raw nanoindentation data in conjunction with the measurement of local microstructure at the indentation site using OIM to study the changes in the local slip resistances as a function of distance from the grain boundaries. Eight grain boundaries were selected for this work such that they included a broad range of boundaries, including low and high (grain-to-grain misorientation) angle boundaries as well as low, moderate, and high deviations in the Taylor factors of the grains on either side of the boundary. It was concluded that there was additional hardening in the grain boundary region when a Taylor ‘soft’ grain was present next to a Taylor ‘hard’ grain. This hardening was consistently observed on the soft grain side with one exception where hardening was observed on both sides of the boundary. A positive correlation was observed between the difference in Taylor factor across the boundary and the amount of hardening on the ‘soft’ grain side. However, no correlation was observed between the grain-to-grain misorientation angle and the extent of hardening at the grain boundary.},
doi = {10.1016/j.ijplas.2016.01.001},
journal = {International Journal of Plasticity},
number = C,
volume = 81,
place = {United States},
year = {2016},
month = {2}
}

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