Abstract
Cerium and magnesium strengthened aluminum alloys, or Al-Ce-Mg, is a recently developed alloy family that exhibits good mechanical properties at elevated temperatures (~300 °C). To examine the single-crystal properties of Al-Ce-Mg alloys, nanoindentation experiments are conducted in this study. A crystal plasticity finite element model (CPFEM) with the evolution of geometrically necessary dislocations (GNDs) is applied to simulate the indentation in individual grains. A parametric study is carried out to investigate the sensitivity of each crystal plasticity model parameter to the indentation behavior. The highly sensitive parameters are calibrated by matching the indentation load-depth curves, while the rest parameters are obtained from bulk polycrystal uniaxial tension tests. Overall, satisfactory matching between experiment and simulation is obtained for each individual grain. The calculated hardness, as determined from the experiment, shows the dependence on indent depth, which is captured by the GND model. Furthermore, the effect of grain orientation and neighboring grains to nanoindentation behavior have been discussed with the comparison between the simulation and experiments.
Original language | English |
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Article number | 111233 |
Journal | International Journal of Solids and Structures |
Volume | 233 |
DOIs | |
State | Published - Dec 15 2021 |
Funding
This manuscript has been authored in part by UT-Battelle, LLC, under contract DE-AC05-00OR22725 with the US Department of Energy (DOE). The US government retains and the publisher, by accepting the article for publication, acknowledges that the US government retains a nonexclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this manuscript, or allow others to do so, for US government purposes. DOE will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan (https://www.energy.gov/downloads/doe-public-access-plan) This research was sponsored by the Oak Ridge National Laboratory ( ORNL ), Energy and Transportation Science Division. ORNL is managed by UT-Battelle, LLC for the U.S. Department of Energy under Contract DE-AC05 00OR22725. This work was funded by the DOE Building Technologies Office managed by Mr. Antonio Bouza. Experiment support by the High Temperature Materials Laboratory at Oak Ridge National Laboratory is gratefully acknowledged. We would also like to thank the Critical Materials Institute, an Energy Innovation Hub funded by the U.S. Department of Energy, and Eck Industries for providing material samples.
Keywords
- Al-Ce-Mg alloys
- Crystal plasticity
- Geometrically necessary dislocations
- Nanoindentation