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

Journal Article · · International Journal of Plasticity
 [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

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.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Office of Nuclear Energy (NE)
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1468570
Alternate ID(s):
OSTI ID: 1359205
Report Number(s):
LA-UR-15-26113
Journal Information:
International Journal of Plasticity, Vol. 81, Issue C; ISSN 0749-6419
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 58 works
Citation information provided by
Web of Science

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EBSD Analysis of Orientation Gradients Developed near Grain Boundaries journal January 2019
Gradientes de orientación en cercanías del borde de grano estudiados por EBSD journal January 2018
Full-stage prediction of discontinuous dynamic recrystallization of a titanium alloy through a sub-mesh internal state variables method journal December 2018
Bayesian Sequential Design of Experiments for Extraction of Single-Crystal Material Properties from Spherical Indentation Measurements on Polycrystalline Samples journal June 2019
Direct imaging of short-range order and its impact on deformation in Ti-6Al journal December 2019
Algorithm based on regional separation for automatic grain boundary extraction using improved mean shift method journal April 2018