Polycrystalline elastic moduli of a high-entropy alloy at cryogenic temperatures
Abstract
A FCC high-entropy alloy (HEA) that exhibits strong temperature dependence of strength at low homologous temperatures in sharp contrast to pure FCC metals like Ni that show weak temperature dependence is CrMnCoFeNi. In order to understand this behavior, elastic constants were determined as a function of temperature. From 300 K down to 55 K, the shear modulus (G) of the HEA changes by only 8%, increasing from 80 to 86 GPa. Moreover, this temperature dependence is weaker than that of FCC Ni, whose G increases by 12% (81–91 GPa). Therefore, the uncharacteristic temperature-dependence of the strength of the HEA is not due to the temperature dependence of its shear modulus.
- Authors:
-
[1];
- Univ. of Tennessee, Knoxville, TN (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1185661
- Alternate Identifier(s):
- OSTI ID: 1254771
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Intermetallics
- Additional Journal Information:
- Journal Volume: 58; Journal Issue: C; Journal ID: ISSN 0966-9795
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; A. High-entropy alloys; B. Elastic properties
Citation Formats
Haglund, A., Koehler, M., Catoor, D., George, E. P., and Keppens, V. Polycrystalline elastic moduli of a high-entropy alloy at cryogenic temperatures. United States: N. p., 2014.
Web. doi:10.1016/j.intermet.2014.11.005.
Haglund, A., Koehler, M., Catoor, D., George, E. P., & Keppens, V. Polycrystalline elastic moduli of a high-entropy alloy at cryogenic temperatures. United States. https://doi.org/10.1016/j.intermet.2014.11.005
Haglund, A., Koehler, M., Catoor, D., George, E. P., and Keppens, V. Fri .
"Polycrystalline elastic moduli of a high-entropy alloy at cryogenic temperatures". United States. https://doi.org/10.1016/j.intermet.2014.11.005. https://www.osti.gov/servlets/purl/1185661.
@article{osti_1185661,
title = {Polycrystalline elastic moduli of a high-entropy alloy at cryogenic temperatures},
author = {Haglund, A. and Koehler, M. and Catoor, D. and George, E. P. and Keppens, V.},
abstractNote = {A FCC high-entropy alloy (HEA) that exhibits strong temperature dependence of strength at low homologous temperatures in sharp contrast to pure FCC metals like Ni that show weak temperature dependence is CrMnCoFeNi. In order to understand this behavior, elastic constants were determined as a function of temperature. From 300 K down to 55 K, the shear modulus (G) of the HEA changes by only 8%, increasing from 80 to 86 GPa. Moreover, this temperature dependence is weaker than that of FCC Ni, whose G increases by 12% (81–91 GPa). Therefore, the uncharacteristic temperature-dependence of the strength of the HEA is not due to the temperature dependence of its shear modulus.},
doi = {10.1016/j.intermet.2014.11.005},
journal = {Intermetallics},
number = C,
volume = 58,
place = {United States},
year = {Fri Dec 05 00:00:00 EST 2014},
month = {Fri Dec 05 00:00:00 EST 2014}
}
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