Role of deformation twinning in fatigue of CrCoNi medium-entropy alloy at room temperature
Abstract
Here cylindrical specimens of CrCoNi alloy with electropolished surfaces were subjected to constant total strain amplitude low cycle fatigue. The alloy exhibited an initial period of cyclic hardening followed by cyclic softening until failure occurred. At the end of hardening stage at the peak of cyclic stress, well-developed persistent slip markings (PSMs) consisting of extrusions and intrusions were associated with thin deformation twins. A sophisticated experimental workflow was designed to extract information from the surface and the bulk of tested material. A combination of SEM, EBSD, ECCI, FIB and HR-STEM was used to study the internal structure and the surface profiles around the deformation twins, which were produced during the initial period of cyclic loading. Furthermore, localized cyclic plastic strain and stress concentrations near deformation twins led not only to early, well-developed PSMs, but also to the activation of TWIP and TRIP plasticity even at low macroscopic stress amplitudes.
- Authors:
-
- The Ohio State Univ., Columbus, OH (United States); Czech Academy of Sciences, Brno (Czech Republic)
- Exponent, Inc., Menlo Park, CA (United States)
- The Ohio State Univ., Columbus, OH (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division; Univ. of Tennessee, Knoxville, TN (United States)
- Czech Academy of Sciences, Brno (Czech Republic)
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); The Ohio State Univ., Columbus, OH (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; National Science Foundation (NSF); Thermo Fisher Scientific; Czechoslovak Microscopy Society
- OSTI Identifier:
- 1860593
- Grant/Contract Number:
- AC05-00OR22725; DMR-1905748
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Scripta Materialia
- Additional Journal Information:
- Journal Volume: 202; Journal Issue: N.A.; Journal ID: ISSN 1359-6462
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; Medium-entropy alloys; high-entropy alloys; deformation twinning; fatigue; crack initiation; persistent slip marking
Citation Formats
Heczko, Milan, Mazánová, Veronika, Slone, Connor E., Shih, Mulaine, George, Easo P., Ghazisaeidi, Maryam, Polák, Jaroslav, and Mills, Michael J. Role of deformation twinning in fatigue of CrCoNi medium-entropy alloy at room temperature. United States: N. p., 2021.
Web. doi:10.1016/j.scriptamat.2021.113985.
Heczko, Milan, Mazánová, Veronika, Slone, Connor E., Shih, Mulaine, George, Easo P., Ghazisaeidi, Maryam, Polák, Jaroslav, & Mills, Michael J. Role of deformation twinning in fatigue of CrCoNi medium-entropy alloy at room temperature. United States. https://doi.org/10.1016/j.scriptamat.2021.113985
Heczko, Milan, Mazánová, Veronika, Slone, Connor E., Shih, Mulaine, George, Easo P., Ghazisaeidi, Maryam, Polák, Jaroslav, and Mills, Michael J. Mon .
"Role of deformation twinning in fatigue of CrCoNi medium-entropy alloy at room temperature". United States. https://doi.org/10.1016/j.scriptamat.2021.113985. https://www.osti.gov/servlets/purl/1860593.
@article{osti_1860593,
title = {Role of deformation twinning in fatigue of CrCoNi medium-entropy alloy at room temperature},
author = {Heczko, Milan and Mazánová, Veronika and Slone, Connor E. and Shih, Mulaine and George, Easo P. and Ghazisaeidi, Maryam and Polák, Jaroslav and Mills, Michael J.},
abstractNote = {Here cylindrical specimens of CrCoNi alloy with electropolished surfaces were subjected to constant total strain amplitude low cycle fatigue. The alloy exhibited an initial period of cyclic hardening followed by cyclic softening until failure occurred. At the end of hardening stage at the peak of cyclic stress, well-developed persistent slip markings (PSMs) consisting of extrusions and intrusions were associated with thin deformation twins. A sophisticated experimental workflow was designed to extract information from the surface and the bulk of tested material. A combination of SEM, EBSD, ECCI, FIB and HR-STEM was used to study the internal structure and the surface profiles around the deformation twins, which were produced during the initial period of cyclic loading. Furthermore, localized cyclic plastic strain and stress concentrations near deformation twins led not only to early, well-developed PSMs, but also to the activation of TWIP and TRIP plasticity even at low macroscopic stress amplitudes.},
doi = {10.1016/j.scriptamat.2021.113985},
journal = {Scripta Materialia},
number = N.A.,
volume = 202,
place = {United States},
year = {Mon May 24 00:00:00 EDT 2021},
month = {Mon May 24 00:00:00 EDT 2021}
}
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