Temperature effects on the serrated behavior of an Al0.5CoCrCuFeNi high-entropy alloy
Abstract
Compression experiments of the Al0.5CoCrCuFeNi high-entropy alloy (HEA) under displacement control were conducted at different temperatures ranging from 673 K to 873 K with a low strain rate of 2 x 10-4/s to study its serration behavior. Samples after compression tests were investigated, using the synchrontron-diffraction technique and transmission-electron microscopy. By comparing the stress-strain curves at different temperatures, two opposite directions of serrations were observed, named the upward serration appearing at 573 K and 673 K and the downward serration at 773 K and 873 K. The different directions of serrations were discussed in terms of not only the relationships among the stress vs. strain, stress vs. time, and strain vs. time, but also the interactions among dislocations, atoms, and nanoparticles. Lastly, the temperature effect on the flow serration is discussed by referring to a theoretical framework for the initiation of the serrated flow. Beyond a critical high temperature, the initiation of the serrated flow becomes swiftly difficult, and ultimately the plastic flow in the full deformation range turns smooth. Such a theoretical prediction of normal behavior is essentially in qualitative agreement with the experimental observation in the present work, i.e., the critical strain to intiate the serration decreases, withmore »
- Authors:
-
- The Univ. of Tennessee, Knoxville, TN (United States)
- Taiyuan Univ. of Technology (China)
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Univ. of Science and Technology Beijing (China)
- Univ. of Illinois at Urbana Champaign, Urbana, IL (United States)
- Publication Date:
- Research Org.:
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division; National Science Foundation (NSF); USDOE Office of Fossil Energy (FE); National Science Foundation of China; USDOE Office of Fossil Energy and Carbon Management (FECM)
- OSTI Identifier:
- 1471593
- Alternate Identifier(s):
- OSTI ID: 1549802
- Grant/Contract Number:
- AC02-06CH11357; FE0008855; FE-0024054; FE-0011194
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Materials Chemistry and Physics
- Additional Journal Information:
- Journal Volume: 210; Journal Issue: C; Journal ID: ISSN 0254-0584
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; Compression tests; High entropy alloy; Serration behavior
Citation Formats
Chen, Shuying, Xie, Xie, Li, Weidong, Feng, Rui, Chen, Bilin, Qiao, Junwei, Ren, Yang, Zhang, Yong, Dahmen, Karin A., and Liaw, Peter K. Temperature effects on the serrated behavior of an Al0.5CoCrCuFeNi high-entropy alloy. United States: N. p., 2017.
Web. doi:10.1016/j.matchemphys.2017.09.004.
Chen, Shuying, Xie, Xie, Li, Weidong, Feng, Rui, Chen, Bilin, Qiao, Junwei, Ren, Yang, Zhang, Yong, Dahmen, Karin A., & Liaw, Peter K. Temperature effects on the serrated behavior of an Al0.5CoCrCuFeNi high-entropy alloy. United States. https://doi.org/10.1016/j.matchemphys.2017.09.004
Chen, Shuying, Xie, Xie, Li, Weidong, Feng, Rui, Chen, Bilin, Qiao, Junwei, Ren, Yang, Zhang, Yong, Dahmen, Karin A., and Liaw, Peter K. Tue .
"Temperature effects on the serrated behavior of an Al0.5CoCrCuFeNi high-entropy alloy". United States. https://doi.org/10.1016/j.matchemphys.2017.09.004. https://www.osti.gov/servlets/purl/1471593.
@article{osti_1471593,
title = {Temperature effects on the serrated behavior of an Al0.5CoCrCuFeNi high-entropy alloy},
author = {Chen, Shuying and Xie, Xie and Li, Weidong and Feng, Rui and Chen, Bilin and Qiao, Junwei and Ren, Yang and Zhang, Yong and Dahmen, Karin A. and Liaw, Peter K.},
abstractNote = {Compression experiments of the Al0.5CoCrCuFeNi high-entropy alloy (HEA) under displacement control were conducted at different temperatures ranging from 673 K to 873 K with a low strain rate of 2 x 10-4/s to study its serration behavior. Samples after compression tests were investigated, using the synchrontron-diffraction technique and transmission-electron microscopy. By comparing the stress-strain curves at different temperatures, two opposite directions of serrations were observed, named the upward serration appearing at 573 K and 673 K and the downward serration at 773 K and 873 K. The different directions of serrations were discussed in terms of not only the relationships among the stress vs. strain, stress vs. time, and strain vs. time, but also the interactions among dislocations, atoms, and nanoparticles. Lastly, the temperature effect on the flow serration is discussed by referring to a theoretical framework for the initiation of the serrated flow. Beyond a critical high temperature, the initiation of the serrated flow becomes swiftly difficult, and ultimately the plastic flow in the full deformation range turns smooth. Such a theoretical prediction of normal behavior is essentially in qualitative agreement with the experimental observation in the present work, i.e., the critical strain to intiate the serration decreases, with the increasing temperature.},
doi = {10.1016/j.matchemphys.2017.09.004},
journal = {Materials Chemistry and Physics},
number = C,
volume = 210,
place = {United States},
year = {Tue Sep 05 00:00:00 EDT 2017},
month = {Tue Sep 05 00:00:00 EDT 2017}
}
Web of Science
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Works referencing / citing this record:
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