Phase stability and thermodynamic database validation in a set of non-equiatomic Al-Co-Cr-Fe-Nb-Ni high-entropy alloys
Abstract
A series of six high-entropy alloys in non-equiatomic proportions were produced to study the phase stability across a range of compositions within the Al-Co-Cr-Fe-Nb-Ni system. Phase identification was performed using SEM, TEM, and XRD and computational tools were employed for comparison to the experimental findings. Complex microstructures were obtained following exposure at 900 °C with precipitation of Laves, NiAl, γ' and δ phases. Primary and secondary Laves populations were identified and found to become more stable with increasing Fe and Nb content. Additions of Nb promoted the formation of thin, plate-like, δ phase at the expense of the secondary Laves. The NiAl phase was observed to precipitate in the alloys with high Fe content, above the γ' solvus temperature. Overall, the thermodynamic predictions using Thermo-Calc with the TCNi8 database were accurate with respect to identifying the phase composition, while TTNi8 provided good phase stability results. Furthermore, significant differences were observed with respect to the solvus temperatures of the precipitate phases.
- Authors:
-
[2];
- National Energy Technology Lab. (NETL), Albany, OR (United States); AECOM, Albany, OR (United States)
- Univ. of Science and Technology Beijing, Beijing (China); Illinois Inst. of Technology, Chicago, IL (United States)
- Illinois Inst. of Technology, Chicago, IL (United States)
- Publication Date:
- Research Org.:
- National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV, and Albany, OR (United States)
- Sponsoring Org.:
- FE; USDOE
- OSTI Identifier:
- 1532673
- Alternate Identifier(s):
- OSTI ID: 1636708
- Grant/Contract Number:
- FE0004000
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Intermetallics
- Additional Journal Information:
- Journal Volume: 104; Journal Issue: C; Journal ID: ISSN 0966-9795
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE
Citation Formats
Detrois, Martin, Antonov, Stoichko, and Tin, Sammy. Phase stability and thermodynamic database validation in a set of non-equiatomic Al-Co-Cr-Fe-Nb-Ni high-entropy alloys. United States: N. p., 2018.
Web. doi:10.1016/j.intermet.2018.11.002.
Detrois, Martin, Antonov, Stoichko, & Tin, Sammy. Phase stability and thermodynamic database validation in a set of non-equiatomic Al-Co-Cr-Fe-Nb-Ni high-entropy alloys. United States. https://doi.org/10.1016/j.intermet.2018.11.002
Detrois, Martin, Antonov, Stoichko, and Tin, Sammy. Sat .
"Phase stability and thermodynamic database validation in a set of non-equiatomic Al-Co-Cr-Fe-Nb-Ni high-entropy alloys". United States. https://doi.org/10.1016/j.intermet.2018.11.002. https://www.osti.gov/servlets/purl/1532673.
@article{osti_1532673,
title = {Phase stability and thermodynamic database validation in a set of non-equiatomic Al-Co-Cr-Fe-Nb-Ni high-entropy alloys},
author = {Detrois, Martin and Antonov, Stoichko and Tin, Sammy},
abstractNote = {A series of six high-entropy alloys in non-equiatomic proportions were produced to study the phase stability across a range of compositions within the Al-Co-Cr-Fe-Nb-Ni system. Phase identification was performed using SEM, TEM, and XRD and computational tools were employed for comparison to the experimental findings. Complex microstructures were obtained following exposure at 900 °C with precipitation of Laves, NiAl, γ' and δ phases. Primary and secondary Laves populations were identified and found to become more stable with increasing Fe and Nb content. Additions of Nb promoted the formation of thin, plate-like, δ phase at the expense of the secondary Laves. The NiAl phase was observed to precipitate in the alloys with high Fe content, above the γ' solvus temperature. Overall, the thermodynamic predictions using Thermo-Calc with the TCNi8 database were accurate with respect to identifying the phase composition, while TTNi8 provided good phase stability results. Furthermore, significant differences were observed with respect to the solvus temperatures of the precipitate phases.},
doi = {10.1016/j.intermet.2018.11.002},
journal = {Intermetallics},
number = C,
volume = 104,
place = {United States},
year = {Sat Nov 10 00:00:00 EST 2018},
month = {Sat Nov 10 00:00:00 EST 2018}
}
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