Experiment and non-local crystal plasticity finite element study of nanoindentation on Al-8Ce-10Mg alloy

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 cr...

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Bibliographic Details
Published in:International journal of solids and structures 2021-12, Vol.233, p.111233, Article 111233
Main Authors: Cheng, Jiahao, Lane, Ryan, Kesler, Michael S., Brechtl, Jamieson, Hu, Xiaohua, Mirzaeifar, Reza, Rios, Orlando, Momen, Ayyoub M., Nawaz, Kashif
Format: Article
Language:English
Subjects:
Al-Ce-Mg alloys
Alloys
Aluminum base alloys
Cerium
Crystal plasticity
Experiments
Finite element method
Geometrically necessary dislocations
Grain orientation
High temperature
Load matching
Magnesium base alloys
MATERIALS SCIENCE
Mathematical models
Mechanical properties
Nanoindentation
Orientation effects
Parameter sensitivity
Plastic properties
Polycrystals
Simulation
Single crystals
Tension tests
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Summary: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.
ISSN:0020-7683
1879-2146
DOI:10.1016/j.ijsolstr.2021.111233