Temperature effects on the serrated behavior of an Al0.5CoCrCuFeNi high-entropy alloy
- 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)
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.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- 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)
- Grant/Contract Number:
- AC02-06CH11357; FE0008855; FE-0024054; FE-0011194
- OSTI ID:
- 1471593
- Alternate ID(s):
- OSTI ID: 1549802
- Journal Information:
- Materials Chemistry and Physics, Vol. 210, Issue C; ISSN 0254-0584
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Tensile Properties and Serrated Flow Behavior of As-Cast CoCrFeMnNi High-Entropy Alloy at Room and Elevated Temperatures
|
journal | October 2018 |
Effects of Al Addition on Microstructures and Mechanical Properties of CoCrFeMnNiAlx High Entropy Alloy Films
|
journal | December 2019 |
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