The effects of carbon on the phase stability and mechanical properties of heat-treated FeNiMnCrAl high entropy alloys
Abstract
This work systematically investigates the effect of carbon on the phase stability and room- temperature tensile performance of an annealed Fe40.4Ni11.3Mn34.8Al7.5Cr6 (at%) high entropy alloy without (HEA) and with 1.1% carbon (CHEA). Four annealing conditions were investigated: 773 K for 13 d and 42 d, 973 K for 20 d, and 1073 K and 1423 K for 24 h. The resulting microstructures were analyzed using a combination of scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive spectroscopy (EDS), and atom probe tomography (APT). Vickers hardness testing and room- temperature tensile testing were used to determine the mechanical properties of the annealed HEA and the CHEA. APT composition profiles revealed fine Ni,Mn,Al-enriched matrix precipitates in the CHEA annealed at 773 K for 13 d. After ageing at 773 K for 42 d, colonies of (Ni,Fe)2MnAl- enriched Heusler phase lamellae were observed at the grain boundaries (GBs) and in the matrix for the HEA, while GB lamellar colonies of Mn,Cr-enriched M23C6 carbides were observed for the CHEA. Due to the presence of the GB carbides, the resulting room-temperature elongation to fracture for the CHEA annealed at 773 K for 42 d was ~1% compared to ~11% for the HEA givenmore »
- Authors:
-
[2];
- Dartmouth College, Hanover, NH (United States)
- Max-Planck-Inst. für Eisenforschung, Düsseldorf (Germany)
- University of New South Wales, NSW (Australia)
- Publication Date:
- Research Org.:
- Dartmouth College, Hanover, NH (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); Dartmouth College
- OSTI Identifier:
- 1593731
- Alternate Identifier(s):
- OSTI ID: 1547828
- Grant/Contract Number:
- SC0018962; AC02-05CH11231; AC02–05CH11231
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing
- Additional Journal Information:
- Journal Volume: 748; Journal Issue: C; Journal ID: ISSN 0921-5093
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; high entropy alloy; phase stability; carbides; mechanical properties
Citation Formats
Wu, Margaret, Li, Zhiming, Gault, Baptiste, Munroe, Paul, and Baker, Ian. The effects of carbon on the phase stability and mechanical properties of heat-treated FeNiMnCrAl high entropy alloys. United States: N. p., 2019.
Web. doi:10.1016/j.msea.2019.01.083.
Wu, Margaret, Li, Zhiming, Gault, Baptiste, Munroe, Paul, & Baker, Ian. The effects of carbon on the phase stability and mechanical properties of heat-treated FeNiMnCrAl high entropy alloys. United States. https://doi.org/10.1016/j.msea.2019.01.083
Wu, Margaret, Li, Zhiming, Gault, Baptiste, Munroe, Paul, and Baker, Ian. Sat .
"The effects of carbon on the phase stability and mechanical properties of heat-treated FeNiMnCrAl high entropy alloys". United States. https://doi.org/10.1016/j.msea.2019.01.083. https://www.osti.gov/servlets/purl/1593731.
@article{osti_1593731,
title = {The effects of carbon on the phase stability and mechanical properties of heat-treated FeNiMnCrAl high entropy alloys},
author = {Wu, Margaret and Li, Zhiming and Gault, Baptiste and Munroe, Paul and Baker, Ian},
abstractNote = {This work systematically investigates the effect of carbon on the phase stability and room- temperature tensile performance of an annealed Fe40.4Ni11.3Mn34.8Al7.5Cr6 (at%) high entropy alloy without (HEA) and with 1.1% carbon (CHEA). Four annealing conditions were investigated: 773 K for 13 d and 42 d, 973 K for 20 d, and 1073 K and 1423 K for 24 h. The resulting microstructures were analyzed using a combination of scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive spectroscopy (EDS), and atom probe tomography (APT). Vickers hardness testing and room- temperature tensile testing were used to determine the mechanical properties of the annealed HEA and the CHEA. APT composition profiles revealed fine Ni,Mn,Al-enriched matrix precipitates in the CHEA annealed at 773 K for 13 d. After ageing at 773 K for 42 d, colonies of (Ni,Fe)2MnAl- enriched Heusler phase lamellae were observed at the grain boundaries (GBs) and in the matrix for the HEA, while GB lamellar colonies of Mn,Cr-enriched M23C6 carbides were observed for the CHEA. Due to the presence of the GB carbides, the resulting room-temperature elongation to fracture for the CHEA annealed at 773 K for 42 d was ~1% compared to ~11% for the HEA given the same anneal. At higher annealing temperatures, the microstructure contains Ni,Al-rich and Mn,Cr,C-rich precipitates that alternate along the GBs and appear to be associated with each other in the matrix. Electron diffraction analysis indicates the aforementioned Ni,Al-precipitates and Mn,Cr-carbides have b.c.c. and f.c.c. crystal structures, respectively. Once again, a low elongation to fracture (2%) was seen for the carbon-containing material compared to its un-doped counterpart (23%) which solely contained Ni,Al-rich b.c.c. precipitates.},
doi = {10.1016/j.msea.2019.01.083},
journal = {Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing},
number = C,
volume = 748,
place = {United States},
year = {Sat Jan 26 00:00:00 EST 2019},
month = {Sat Jan 26 00:00:00 EST 2019}
}
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