Author
Radi, Amin, Sajadifar, S., Seyedmohammadi, Seyedveghar, Krochmal, M., Bolender, A., Wegener, T., Niendorf, T., Yapıcı, Güney Güven
Publication Date
2023-08
Publication Place
-
Elsevier
Subject
High entropy alloy (HEA), Low-cycle fatigue (LCF), Microstructure, Thermo-mechanical processing (TMP), Transformation induced plasticity (TRIP), Twinning induced plasticity (TWIP)
Type
Periodical
Language
English
Digital
Yes
Manuscript
No
Library
Özyeğin University
Library Asset ID
0142-1123
Record ID
40bede1a-7c68-441b-9d92-71a1c961986c
Library Location
Mechanical Engineering
Date
2023-08
Notes
Deutsche Forschungsgemeinschaft
Sample Text
A multi-phase non-equiatomic FeCrNiMnCo high entropy alloy (HEA) was fabricated using vacuum induction melting. Thermo-mechanical treatments consisting of cold rolling and annealing at 750 °C and 850 °C were employed to improve the mechanical properties of the HEA in focus. Tensile experiments revealed that yield strength and ultimate tensile strength levels can be enhanced significantly after thermo-mechanical processing (TMP). At the same time, ductility remains at an adequate level. Strain-controlled low-cycle fatigue (LCF) experiments were carried out in order to assess the mechanical properties of this HEA under cyclic loading conditions. At the same strain amplitude, the stress levels of the processed samples were considerably higher than that of the as-received counterpart. Similarly, fatigue lives of the former could surpass the base condition at the strain amplitudes of 0.2% and 0.4%; however, at the higher strain amplitudes, cyclic softening was observed. Electron backscatter diffraction (EBSD) and X-ray diffraction (XRD) results revealed that phase transformation from face-centered cubic (FCC) to body-centered cubic (BCC/B2) took place at a higher occurrence with increasing strain amplitude (0.2% to 0.6%). Furthermore, transmission electron microscopy (TEM) studies confirm that upon tensile deformation additional plasticity mechanisms, i.e., deformation twinning and phase transformation, contribute to the overall mechanical behavior of the multi-phase HEA.
DOI
10.1016/j.ijfatigue.2023.107678
Cilt
173
