Journal
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
Volume 18, Issue -, Pages 5144-5160Publisher
ELSEVIER
DOI: 10.1016/j.jmrt.2022.05.005
Keywords
Ni-based single crystal superalloys; Low cycle fatigue; Re effects; Deformation mechanism; Molecular dynamics simulation
Funding
- National Natural Science Foundation of China [11772236,12172259, 52009097]
Ask authors/readers for more resources
This study investigates the effects of rhenium (Re) on low cycle fatigue behaviors and deformation mechanisms of Ni-based single crystal superalloys using molecular dynamics simulations. The results show that the addition of Re improves the low cycle fatigue behaviors and enhances the plastic deformation resistance of the superalloys. The cyclic deformation mechanism is strongly influenced by temperature.
Molecular dynamics simulations are carried out to investigate the effects of rhenium (Re) on low cycle fatigue behaviors and deformation mechanisms of Ni-based single crystal superalloys. The low cycle fatigue behaviors and deformation mechanisms at different temperatures are discussed. The results show that Re has a positive effect on the low cycle fatigue behaviors of Ni-based single crystal superalloys and the cyclic deformation mechanism is strongly dependent on temperature, which are in good agreement with the previous experimental results. The addition of Re can increase the saturation stress amplitude, reduce the cyclic hysteresis energy and dislocation density, and improve the plastic deformation resistance of the superalloys. During cyclic loading, Re atoms in y matrix phase gradually move to the y/y' interface, these enrichment of Re atoms at the y/y' interface have pinning effect on dislocations, improving the microstructure stability. At the later of the saturation cycle, segregations of Re atoms prevent the dislocations from cutting into the y0 phase by dragging dislocations, thus improving the fatigue resistance of superalloys. The simulation results also show that the deformation mechanism gradually changes from dislocations and stacking faults shearing y' precipitate phase to Orowan bypassing and climbing mechanism with temperature increases. (c) 2022 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available